Tb³⁺ Doped Transparent Germanate Glass Ceramics: Preparation and Enhanced Luminescence for X-ray Detection Enhanced Publication

{ "defaultlang": "en", "titlegroup": { "articletitle": [ { "lang": "en", "data": [ { "name": "text", "data": "Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": " Doped Transparent Germanate Glass Ceramics: Preparation and Enhanced Luminescence for X-ray Detection" } ] }, { "lang": "zh", "data": [ { "name": "text", "data": "Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": "掺杂透明锗酸盐微晶玻璃:制备与面向X射线探测的增强发光" } ] } ] }, "contribgroup": { "author": [ { "name": [ { "lang": "en", "surname": "CHEN", "givenname": "Yu-xuan", "namestyle": "eastern", "prefix": "" }, { "lang": "zh", "surname": "陈", "givenname": "宇暄", "namestyle": "eastern", "prefix": "" } ], "stringName": [], "aff": [ { "rid": "aff1", "text": "1" }, { "rid": "aff2", "text": "2" } ], "role": [ "first-author" ], "bio": [ { "lang": "en", "text": [ "陈宇暄(1994-)，男，山西大同人，硕士研究生，2017年于天津城建大学获得学士学位，主要从事发光材料与器件的研究。E-mail: 1208110892@qq.com" ], 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"name": "text", "data": "Corresponding Author, E-mail: huanglihui@cjlu.edu.cn" } ] } ], "bio": [ { "lang": "en", "text": [ "黄立辉(1972-)，男，江西赣县人，博士，教授，2001年于中国科学院长春光学精密机械与物理研究所获得博士学位，主要从事发光材料与器件的研究。E-mail:huanglihui@cjlu.edu.cn" ], "graphic": [ { "print": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=21350736&type=", "small": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=21350738&type=", "big": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=21350740&type=" } ], "data": [ [ { "name": "text", "data": "黄立辉" }, { "name": "text", "data": "(1972-)，男，江西赣县人，博士，教授，2001年于中国科学院长春光学精密机械与物理研究所获得博士学位，主要从事发光材料与器件的研究。E-mail:" }, { "name": "text", "data": "huanglihui@cjlu.edu.cn" } ] ] } ], "email": "huanglihui@cjlu.edu.cn", "deceased": false }, { "name": [ { "lang": "en", "surname": "ZHAO", "givenname": "Jing-tao", "namestyle": "eastern", "prefix": "" }, { "lang": "zh", "surname": "赵", "givenname": "静涛", "namestyle": "eastern", "prefix": "" } ], "stringName": [], "aff": [ { "rid": "aff2", "text": "2" }, { "rid": "aff3", "text": "3" }, { "rid": "aff4", "text": "4" } ], "role": [], "deceased": false }, { "name": [ { "lang": "en", "surname": "ZHAO", "givenname": "Shi-long", "namestyle": "eastern", "prefix": "" }, { "lang": "zh", "surname": "赵", "givenname": "士龙", "namestyle": "eastern", "prefix": "" } ], "stringName": [], "aff": [ { "rid": "aff2", "text": "2" }, { "rid": "aff3", "text": "3" } ], "role": [], "deceased": false }, { "name": [ { "lang": "en", "surname": "XU", "givenname": "Shi-qing", "namestyle": "eastern", "prefix": "" }, { "lang": "zh", "surname": "徐", "givenname": "时清", "namestyle": "eastern", "prefix": "" } ], "stringName": [], "aff": [ { "rid": "aff2", "text": "2" }, { "rid": "aff3", "text": "3" } ], "role": [], "deceased": false } ], "aff": [ { "id": "aff1", "intro": [ { "lang": "en", "label": "1", "text": "College of Materials and Chemistry, China Jiliang University, Hangzhou 310018, China", "data": [ { "name": "text", "data": "College of Materials and Chemistry, China Jiliang University, Hangzhou 310018, China" } ] }, { "lang": "zh", "label": "1", "text": "中国计量大学 材料与化学学院, 浙江 杭州 　 310018", "data": [ { "name": "text", "data": "中国计量大学 材料与化学学院, 浙江 杭州 　 310018" } ] } ] }, { "id": "aff2", "intro": [ { "lang": "en", "label": "2", "text": "Institute of Optoelectronic Materials and Devices, China Jiliang University,Hangzhou 310018, China", "data": [ { "name": "text", "data": "Institute of Optoelectronic Materials and Devices, China Jiliang University,Hangzhou 310018, China" } ] }, { "lang": "zh", "label": "2", "text": "中国计量大学 光电材料与器件研究院, 浙江 杭州 　 310018", "data": [ { "name": "text", "data": "中国计量大学 光电材料与器件研究院, 浙江 杭州 　 310018" } ] } ] }, { "id": "aff3", "intro": [ { "lang": "en", "label": "3", "text": "College of Optical and Electronic Technology, China Jiliang University, Hangzhou 310018, China", "data": [ { "name": "text", "data": "College of Optical and Electronic Technology, China Jiliang University, Hangzhou 310018, China" } ] }, { "lang": "zh", "label": "3", "text": "中国计量大学 光学与电子科技学院, 浙江 杭州 　 310018", "data": [ { "name": "text", "data": "中国计量大学 光学与电子科技学院, 浙江 杭州 　 310018" } ] } ] }, { "id": "aff4", "intro": [ { "lang": "en", "label": "4", "text": "Laboratory of Glasses and Ceramics, Univ Rennes, CNRS, ISCR(Institut des Sciences Chimiques de Rennes) UMR CNRS 6226, University of Rennes 1, Rennes 35042, France", "data": [ { "name": "text", "data": "Laboratory of Glasses and Ceramics, Univ Rennes, CNRS, ISCR(Institut des Sciences Chimiques de Rennes) UMR CNRS 6226, University of Rennes 1, Rennes 35042, France" } ] }, { "lang": "zh", "label": "4", "text": "Laboratory of Glasses and Ceramics, Univ Rennes, CNRS, ISCR(Institut des Sciences Chimiques de Rennes) UMR CNRS 6226, University of Rennes 1, Rennes 35042, France", "data": [ { "name": "text", "data": "Laboratory of Glasses and Ceramics, Univ Rennes, CNRS, ISCR(Institut des Sciences Chimiques de Rennes) UMR CNRS 6226, University of Rennes 1, Rennes 35042, France" } ] } ] } ] }, "abstracts": [ { "lang": "en", "data": [ { "name": "p", "data": [ { "name": "text", "data": "Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": " doped transparent germanate glass ceramics embedded with LaF" }, { "name": "sub", "data": [ { "name": "text", "data": "3" } ] }, { "name": "text", "data": " nanocrystals were successfully prepared " }, { "name": "italic", "data": [ { "name": "text", "data": "via" } ] }, { "name": "text", "data": " melt-quenching and subsequent thermal treatment. The luminescent properties of the as-prepared glass and the glass ceramics were investigated in detail. The X-ray diffraction results prove that the crystalline phase precipitated in the glass matrix was pure LaF" }, { "name": "sub", "data": [ { "name": "text", "data": "3" } ] }, { "name": "text", "data": " crystal and the crystal size was between 16 nm and 21 nm. Under the excitation of 377 nm ultraviolet light and X-ray, Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": " glass ceramics embedded with LaF" }, { "name": "sub", "data": [ { "name": "text", "data": "3" } ] }, { "name": "text", "data": " nanocrystals show much intense green emission than Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": " doped germanate glass, and the green emission intensity increases with the increment of thermal treatment temperature and time. The maximum integrated X-ray excited luminescence intensity of the glass ceramics is about 40.3% of that of Bi" }, { "name": "sub", "data": [ { "name": "text", "data": "4" } ] }, { "name": "text", "data": "Ge" }, { "name": "sub", "data": [ { "name": "text", "data": "3" } ] }, { "name": "text", "data": "O" }, { "name": "sub", "data": [ { "name": "text", "data": "12" } ] }, { "name": "text", "data": " crystal which is the commercial scintillating crystal. Our research shows that Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": " doped germanate glass ceramics embedded with LaF" }, { "name": "sub", "data": [ { "name": "text", "data": "3" } ] }, { "name": "text", "data": " nanocrystals have potential application prospects in X-ray detection." } ] } ] }, { "lang": "zh", "data": [ { "name": "p", "data": [ { "name": "text", "data": "通过熔融淬火和后续热处理，成功制备了Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": "掺杂含LaF" }, { "name": "sub", "data": [ { "name": "text", "data": "3" } ] }, { "name": "text", "data": "纳米晶透明锗酸盐微晶玻璃. 详细研究了所制备的玻璃和微晶玻璃的发光性质. X射线衍射结果表明，玻璃基体中析出的晶相为纯LaF" }, { "name": "sub", "data": [ { "name": "text", "data": "3" } ] }, { "name": "text", "data": "晶体，晶粒尺寸在16~21 nm之间. 在377 nm紫外光和X射线激发下，Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": "掺杂含LaF" }, { "name": "sub", "data": [ { "name": "text", "data": "3" } ] }, { "name": "text", "data": "纳米晶的微晶玻璃比Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": "掺杂的锗酸盐玻璃表现出更强的绿光发射，且绿光发射强度随热处理温度升高和时间的延长而增强. 微晶玻璃在X射线激发下的最大积分发光强度约为商用闪烁晶体Bi" }, { "name": "sub", "data": [ { "name": "text", "data": "4" } ] }, { "name": "text", "data": "Ge" }, { "name": "sub", "data": [ { "name": "text", "data": "3" } ] }, { "name": "text", "data": "O" }, { "name": "sub", "data": [ { "name": "text", "data": "12" } ] }, { "name": "text", "data": "的40.3%. 本研究表明，掺Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": "含LaF" }, { "name": "sub", "data": [ { "name": "text", "data": "3" } ] }, { "name": "text", "data": "纳米晶锗酸盐微晶玻璃在X射线探测中具有潜在的应用前景." } ] } ] } ], "keyword": [ { "lang": "en", "data": [ [ { "name": "text", "data": "luminescence" } ], [ { "name": "text", "data": "Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] } ], [ { "name": "text", "data": "germanate glass" } ], [ { "name": "text", "data": "glass ceramics" } ], [ { "name": "text", "data": "glass scintillator" } ] ] }, { "lang": "zh", "data": [ [ { "name": "text", "data": "发光" } ], [ { "name": "text", "data": "Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] } ], [ { "name": "text", "data": "锗酸盐玻璃" } ], [ { "name": "text", "data": "微晶玻璃" } ], [ { "name": "text", "data": "玻璃闪烁体" } ] ] } ], "highlights": [], "body": [ { "name": "sec", "data": [ { "name": "sectitle", "data": { "title": [ { "name": "text", "data": "1　Introduction" } ], "level": "1", "id": "s1" } }, { "name": "p", "data": [ { "name": "text", "data": "A scintillator is a luminescent material that emits ultraviolet/visible light under the excitation of high-energy particles or rays. Scintillator is widely used in high energy physics, nuclear medicine imaging, detection technology, public security, custom anti-smuggling, space physics, geological exploration and other fields. There are many kinds of scintillators, among which the crystal scintillators are most widely used" }, { "name": "sup", "data": [ { "name": "text", "data": "[" }, { "name": "blockXref", "data": { "data": [ { "name": "xref", "data": { "text": "1", "type": "bibr", "rid": "R1", "data": [ { "name": "text", "data": "1" } ] } }, { "name": "text", "data": "-" }, { "name": "xref", "data": { "text": "3", "type": "bibr", "rid": "R3", "data": [ { "name": "text", "data": "3" } ] } } ], "rid": [ "R1", "R2", "R3" ], "text": "1-3", "type": "bibr" } }, { "name": "text", "data": "]" } ] }, { "name": "text", "data": ". In recent years, with the strengthening of human activities in the fields of nuclear physics, nuclear medicine imaging(such as X-CT, PET), industrial detection, nuclear radiation detection, petroleum logging, public safety and other X-ray detection fields, the demand for low-cost, large size scintillator is becoming more and more urgent. Although the crystal scintillator has high luminescent efficiency, its wide application in the corresponding fields is greatly limited by the long fabrication period, complicated preparation technology, limited size of the crystal, poor chemical stability and high cost. On the contrary, glass scintillator with composition of easy preparation, low cost, easy adjustment, good homogeneity and isotropy, easy processing, easy to be made into various shapes, easy system advantages of large size and realizing large-scale production has been brought to the attention of the material world and physicist, become a hotspot in the research of the scintillator materials" }, { "name": "sup", "data": [ { "name": "text", "data": "[" }, { "name": "blockXref", "data": { "data": [ { "name": "xref", "data": { "text": "4", "type": "bibr", "rid": "R4", "data": [ { "name": "text", "data": "4" } ] } }, { "name": "text", "data": "-" }, { "name": "xref", "data": { "text": "9", "type": "bibr", "rid": "R9", "data": [ { "name": "text", "data": "9" } ] } } ], "rid": [ "R4", "R5", "R6", "R7", "R8", "R9" ], "text": "4-9", "type": "bibr" } }, { "name": "text", "data": "]" } ] }, { "name": "text", "data": ". However, the intrinsic amorphous structure of the glass results in the low luminescence efficiency of " }, { "name": "italic", "data": [ { "name": "text", "data": "RE" } ] }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": " and consequently limit the practical applications of glass scintillator" }, { "name": "sup", "data": [ { "name": "text", "data": "[" }, { "name": "blockXref", "data": { "data": [ { "name": "xref", "data": { "text": "10", "type": "bibr", "rid": "R10", "data": [ { "name": "text", "data": "10" } ] } }, { "name": "text", "data": "-" }, { "name": "xref", "data": { "text": "12", "type": "bibr", "rid": "R12", "data": [ { "name": "text", "data": "12" } ] } } ], "rid": [ "R10", "R11", "R12" ], "text": "10-12", "type": "bibr" } }, { "name": "text", "data": "]" } ] }, { "name": "text", "data": ". Therefore, there is an urgent need to improve the luminescence efficiency." } ] }, { "name": "p", "data": [ { "name": "text", "data": "As everyone knows that fluoride nanocrytals have low phonon energy, the controlled crystallization of fluoride crystals in " }, { "name": "italic", "data": [ { "name": "text", "data": "RE" } ] }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": " activated oxyfluoride glass has been confirmed to be an effective method to improve their luminescent efficiency" }, { "name": "sup", "data": [ { "name": "text", "data": "[" }, { "name": "blockXref", "data": { "data": [ { "name": "xref", "data": { "text": "13", "type": "bibr", "rid": "R13", "data": [ { "name": "text", "data": "13" } ] } }, { "name": "text", "data": "-" }, { "name": "xref", "data": { "text": "14", "type": "bibr", "rid": "R14", "data": [ { "name": "text", "data": "14" } ] } } ], "rid": [ "R13", "R14" ], "text": "13-14", "type": "bibr" } }, { "name": "text", "data": "]" } ] }, { "name": "text", "data": ". Therefore, many researchers reported the enhanced luminescence of " }, { "name": "italic", "data": [ { "name": "text", "data": "RE" } ] }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": " ions in glass ceramics(GCs) containing fluoride nanocrystals" }, { "name": "sup", "data": [ { "name": "text", "data": "[" }, { "name": "blockXref", "data": { "data": [ { "name": "xref", "data": { "text": "15", "type": "bibr", "rid": "R15", "data": [ { "name": "text", "data": "15" } ] } }, { "name": "text", "data": "-" }, { "name": "xref", "data": { "text": "16", "type": "bibr", "rid": "R16", "data": [ { "name": "text", "data": "16" } ] } } ], "rid": [ "R15", "R16" ], "text": "15-16", "type": "bibr" } }, { "name": "text", "data": "]" } ] }, { "name": "text", "data": ". Therefore, the controllable crystallization of fluoride crystals in" }, { "name": "italic", "data": [ { "name": "text", "data": "RE" } ] }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": "-doped scintillating glass is also an effective method to improve their luminescence efficiency" }, { "name": "sup", "data": [ { "name": "text", "data": "[" }, { "name": "xref", "data": { "text": "17", "type": "bibr", "rid": "R17", "data": [ { "name": "text", "data": "17" } ] } }, { "name": "text", "data": "]" } ] }, { "name": "text", "data": ". Meanwhile, " }, { "name": "italic", "data": [ { "name": "text", "data": "RE" } ] }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": " could give more intense emission in germanate glass than it in silicate glass since germanate glass has relatively low phonon energy. In the recent years, Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": " activated germanate glass has been confirmed to be a promising scintillator material" }, { "name": "sup", "data": [ { "name": "text", "data": "[" }, { "name": "blockXref", "data": { "data": [ { "name": "xref", "data": { "text": "18", "type": "bibr", "rid": "R18", "data": [ { "name": "text", "data": "18" } ] } }, { "name": "text", "data": "-" }, { "name": "xref", "data": { "text": "21", "type": "bibr", "rid": "R21", "data": [ { "name": "text", "data": "21" } ] } } ], "rid": [ "R18", "R19", "R20", "R21" ], "text": "18-21", "type": "bibr" } }, { "name": "text", "data": "]" } ] }, { "name": "text", "data": ". Consequently, Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": " doped germanate glass ceramics may be a more promising scintillation material than Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": " doped germanate glass." } ] }, { "name": "p", "data": [ { "name": "text", "data": "In this paper, we prepared Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": " doped transparent germanate glass ceramics embedded with LaF" }, { "name": "sub", "data": [ { "name": "text", "data": "3" } ] }, { "name": "text", "data": " nanocrystals and investigated their luminescent properties." } ] } ] }, { "name": "sec", "data": [ { "name": "sectitle", "data": { "title": [ { "name": "text", "data": "2　Experiments" } ], "level": "1", "id": "s2" } }, { "name": "p", "data": [ { "name": "text", "data": "Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": " doped oxyfluoride germanate glass with composition of 50GeO" }, { "name": "sub", "data": [ { "name": "text", "data": "2" } ] }, { "name": "text", "data": "-12Al" }, { "name": "sub", "data": [ { "name": "text", "data": "2" } ] }, { "name": "text", "data": "O" }, { "name": "sub", "data": [ { "name": "text", "data": "3" } ] }, { "name": "text", "data": "-8Li" }, { "name": "sub", "data": [ { "name": "text", "data": "2" } ] }, { "name": "text", "data": "O-(20-" }, { "name": "italic", "data": [ { "name": "text", "data": "x" } ] }, { "name": "text", "data": ")LaF" }, { "name": "sub", "data": [ { "name": "text", "data": "3" } ] }, { "name": "text", "data": "-10LiF-" }, { "name": "italic", "data": [ { "name": "text", "data": "x" } ] }, { "name": "text", "data": "TbF" }, { "name": "sub", "data": [ { "name": "text", "data": "3" } ] }, { "name": "text", "data": " (" }, { "name": "italic", "data": [ { "name": "text", "data": "x" } ] }, { "name": "text", "data": "=2, 4, 6, 8, 10) was synthesized through conventional high temperature melt quenching method. 20 g of high-purity GeO" }, { "name": "sub", "data": [ { "name": "text", "data": "2" } ] }, { "name": "text", "data": " (99.999%), Al" }, { "name": "sub", "data": [ { "name": "text", "data": "2" } ] }, { "name": "text", "data": "O" }, { "name": "sub", "data": [ { "name": "text", "data": "3" } ] }, { "name": "text", "data": "(99.99%), Li" }, { "name": "sub", "data": [ { "name": "text", "data": "2" } ] }, { "name": "text", "data": "CO" }, { "name": "sub", "data": [ { "name": "text", "data": "3" } ] }, { "name": "text", "data": "(99.99%), LaF" }, { "name": "sub", "data": [ { "name": "text", "data": "3" } ] }, { "name": "text", "data": "(99.99%), LiF(99.99%), and TbF" }, { "name": "sub", "data": [ { "name": "text", "data": "3" } ] }, { "name": "text", "data": "(99.99%) were selected as raw materials. For each batch, starting materials were mixed thoroughly and uniformly in an agate mortar first, and then were put into an alumina crucible with a cover. Finally, the crucible was transferred to an electric furnace and melt at 1 480 ℃for 40 min. After melting, the melt was poured onto a stainless-steel plate and pressed by another stainless-steel plate to cool fast and obtain bulk glass. The as prepared bulk glass was annealed at 500 ℃ for 3 h to release the inner stress, and then cooled to room temperature. Three pieces of oxyfluoride germanate glass(the precursor glass, denoted PG) with Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": " doping concentration of 8% were selected and heat treated at 620 ℃ for 3 h, 640 ℃ for 3 h and 640 ℃ for 6 h to form transparent glass ceramics, named as GC620 ℃-3 h, GC640 ℃-3 h and GC640 ℃-6 h, respectively. All samples were cut and polished elaborately with the regular size of 10.0 mm×10.0 mm×2.0 mm." } ] }, { "name": "p", "data": [ { "name": "text", "data": "The thermal properties of 8% Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": " doped germanate glass were characterized by differential thermal analysis(DTA) on powdered samples using a Netzsch DTA 404PC at a heating rate of 10 K/min. The X-ray diffraction(XRD) patterns were carried out on powdered samples using an X-ray diffraction (Bruker D2 PHASER) with Cu-Kα radiation and 2" }, { "name": "italic", "data": [ { "name": "text", "data": "θ" } ] }, { "name": "text", "data": " data were collected between 10° and 80° with a 0.1° step size. The transmittance spectra of the PG and GCs were recorded on a Shimadzu UV-3600 spectrophotometer in the range of 200-750 nm. The emission spectra and the excitation spectra were performed by a fluorescence spectrophotometer (Jobin-Yvon Fluorolog3) equipped with a Xe lamp.X-ray excited luminescence(XEL)spectra were recorded by a spectrometer(Ocean Optical QE65000) with an X-ray tube(Copper target, 80 kV, 1.5 mA). All of the structural and optical measurements were performed at room temperature." } ] } ] }, { "name": "sec", "data": [ { "name": "sectitle", "data": { "title": [ { "name": "text", "data": "3　Results and Discussion" } ], "level": "1", "id": "s3" } }, { "name": "p", "data": [ { "name": "xref", "data": { "text": "Fig.1", "type": "fig", "rid": "F1", "data": [ { "name": "text", "data": "Fig.1" } ] } }, { "name": "text", "data": " shows the DTA curve of germanate precursor glass when Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": " doping concentration is 8%. The glass transition temperature(" }, { "name": "italic", "data": [ { "name": "text", "data": "T" } ] }, { "name": "sub", "data": [ { "name": "text", "data": "G" } ] }, { "name": "text", "data": ") of this germinate glass is around 551 ℃. And two exothermic peaks can be easily observed at 657 ℃(" }, { "name": "italic", "data": [ { "name": "text", "data": "T" } ] }, { "name": "sub", "data": [ { "name": "text", "data": "x1" } ] }, { "name": "text", "data": ") and 768 ℃(" }, { "name": "italic", "data": [ { "name": "text", "data": "T" } ] }, { "name": "sub", "data": [ { "name": "text", "data": "x2" } ] }, { "name": "text", "data": "). According the XRD results, the first peak is due to the precipitation of LaF" }, { "name": "sub", "data": [ { "name": "text", "data": "3" } ] }, { "name": "text", "data": " nanocrystals and the second peak is due to the crystallization of the glass. The large difference up to 111 ℃ between" }, { "name": "italic", "data": [ { "name": "text", "data": "T" } ] }, { "name": "sub", "data": [ { "name": "text", "data": "x1" } ] }, { "name": "text", "data": " and " }, { "name": "italic", "data": [ { "name": "text", "data": "T" } ] }, { "name": "sub", "data": [ { "name": "text", "data": "x2" } ] }, { "name": "text", "data": " shows that it is easy to crystallize pure LaF" }, { "name": "sub", "data": [ { "name": "text", "data": "3" } ] }, { "name": "text", "data": " crystals in the glass matrix. On the basis of these results, 620 ℃ and 640 ℃ which are near the LaF" }, { "name": "sub", "data": [ { "name": "text", "data": "3" } ] }, { "name": "text", "data": " crystallization temperature were selected as the crystallization temperature." } ] }, { "name": "fig", "data": { "id": "F1", "caption": [ { "lang": "en", "label": [ { "name": "text", "data": "Fig.1" } ], "title": [ { "name": "text", "data": "DTA curve of 8% Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": " doped germanate glass and GC640 ℃-6 h glass ceramics" } ] } ], "subcaption": [], "note": [], "graphics": [ { "print": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=21350742&type=", "small": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=21350745&type=", "big": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=21350743&type=" } ] } }, { "name": "p", "data": [ { "name": "text", "data": "The XRD patterns of 8% Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": " doped PG and GCs are presented in " }, { "name": "xref", "data": { "text": "Fig.2", "type": "fig", "rid": "F2", "data": [ { "name": "text", "data": "Fig.2" } ] } }, { "name": "text", "data": ". The GCs present sharp diffraction peaks while the PG is completely amorphous with no crystalline diffraction peaks. For Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": " doped GCs, the diffraction peaks can be clearly assigned to the hexagonal LaF" }, { "name": "sub", "data": [ { "name": "text", "data": "3" } ] }, { "name": "text", "data": "(JCPDS No.32-0483) and no other diffraction peaks were observed. Using the Scherrer equation" }, { "name": "sup", "data": [ { "name": "text", "data": "[" }, { "name": "xref", "data": { "text": "22", "type": "bibr", "rid": "R22", "data": [ { "name": "text", "data": "22" } ] } }, { "name": "text", "data": "]" } ] }, { "name": "text", "data": ", the size of LaF" }, { "name": "sub", "data": [ { "name": "text", "data": "3" } ] }, { "name": "text", "data": " nanocrystals in the glass ceramic can be estimated based on the XRD pattern. The sizes of LaF" }, { "name": "sub", "data": [ { "name": "text", "data": "3" } ] }, { "name": "text", "data": " nanocrystals were 16.7, 19.6, 21.6 nm for the samples GC620 ℃-3 h, GC640 ℃-3 h and GC640 ℃-6 h, respectively. The results imply that the crystal size in the GCs becomes bigger with increasing thermal treatment temperature and time." } ] }, { "name": "fig", "data": { "id": "F2", "caption": [ { "lang": "en", "label": [ { "name": "text", "data": "Fig.2" } ], "title": [ { "name": "text", "data": "XRD patterns of PG glass, GC620 ℃-3 h, GC640 ℃-3 h and GC 640 ℃-6 h glass ceramics." } ] } ], "subcaption": [], "note": [], "graphics": [ { "print": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=21350749&type=", "small": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=21350758&type=", "big": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=21350753&type=" } ] } }, { "name": "p", "data": [ { "name": "xref", "data": { "text": "Fig.3", "type": "fig", "rid": "F3", "data": [ { "name": "text", "data": "Fig.3" } ] } }, { "name": "text", "data": " shows the transmittance spectra of PG glass, GC620 ℃-3 h, GC640 ℃-3 h, and GC640 ℃-6 h glass ceramics in the ranging from 200 nm to 750 nm. All samples remain agood transparency from 450 to 750 nm(as shown in the photographs of PG, GC620 ℃-3 h, GC640 ℃-3 h, and GC640 ℃-6 h in the inset of " }, { "name": "xref", "data": { "text": "Fig.3", "type": "fig", "rid": "F3", "data": [ { "name": "text", "data": "Fig.3" } ] } }, { "name": "text", "data": "). However, the transparency of GC620 ℃-3 h, GC640 ℃-3 h, and GC640 ℃-6 h have a slight decrease with increasing thermal treatment temperature and the thermal treatment time. Meanwhile, the characteristic optical transitions " }, { "name": "sup", "data": [ { "name": "text", "data": "7" } ] }, { "name": "text", "data": "F" }, { "name": "sub", "data": [ { "name": "text", "data": "6" } ] }, { "name": "text", "data": "→" }, { "name": "sup", "data": [ { "name": "text", "data": "5" } ] }, { "name": "text", "data": "H" }, { "name": "sub", "data": [ { "name": "text", "data": "7" } ] }, { "name": "text", "data": ", " }, { "name": "sup", "data": [ { "name": "text", "data": "5" } ] }, { "name": "text", "data": "D" }, { "name": "sub", "data": [ { "name": "text", "data": "2" } ] }, { "name": "text", "data": ", " }, { "name": "sup", "data": [ { "name": "text", "data": "5" } ] }, { "name": "text", "data": "D" }, { "name": "sub", "data": [ { "name": "text", "data": "3" } ] }, { "name": "text", "data": " and " }, { "name": "sup", "data": [ { "name": "text", "data": "5" } ] }, { "name": "text", "data": "D" }, { "name": "sub", "data": [ { "name": "text", "data": "4" } ] }, { "name": "text", "data": " of Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": " ion induced absorption bands centered at 316, 351, 373, 485 nm appeared. It is also noted that an obvious red shift was observed from the UV cut-off wavelength of GCs, which could be originated to the reduction of non-bridging fluorine(NBF)" }, { "name": "sup", "data": [ { "name": "text", "data": "[" }, { "name": "xref", "data": { "text": "23", "type": "bibr", "rid": "R23", "data": [ { "name": "text", "data": "23" } ] } }, { "name": "text", "data": "]" } ] }, { "name": "text", "data": "." } ] }, { "name": "fig", "data": { "id": "F3", "caption": [ { "lang": "en", "label": [ { "name": "text", "data": "Fig.3" } ], "title": [ { "name": "text", "data": "Transmittance spectra of PG glass, GC620 ℃-3 h, GC640 ℃-3 h and GC640 ℃-6 h glass ceramics, the thickness of all samples is 2 mm." } ] } ], "subcaption": [], "note": [], "graphics": [ { "print": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=21350765&type=", "small": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=21350774&type=", "big": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=21350769&type=" } ] } }, { "name": "p", "data": [ { "name": "text", "data": "Greenish fluorescence is presented in Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": "doped oxyfluoride germanate PG and GCs under the excitation of 377 nm light." }, { "name": "xref", "data": { "text": "Fig.4", "type": "fig", "rid": "F4", "data": [ { "name": "text", "data": "Fig.4" } ] } }, { "name": "text", "data": " is the emission spectra of oxyfluoride germanate glass upon 377 nm light at different Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": "concentration. The spectra are constituted by four emission bands centered at 492, 546, 590, 624 nm, which are attributed to the transitions " }, { "name": "sup", "data": [ { "name": "text", "data": "5" } ] }, { "name": "text", "data": "D" }, { "name": "sub", "data": [ { "name": "text", "data": "4" } ] }, { "name": "text", "data": "→" }, { "name": "sup", "data": [ { "name": "text", "data": "7" } ] }, { "name": "text", "data": "F" }, { "name": "sub", "data": [ { "name": "text", "data": "6" } ] }, { "name": "text", "data": ", " }, { "name": "sup", "data": [ { "name": "text", "data": "5" } ] }, { "name": "text", "data": "D" }, { "name": "sub", "data": [ { "name": "text", "data": "4" } ] }, { "name": "text", "data": "→" }, { "name": "sup", "data": [ { "name": "text", "data": "7" } ] }, { "name": "text", "data": "F" }, { "name": "sub", "data": [ { "name": "text", "data": "5" } ] }, { "name": "text", "data": ", " }, { "name": "sup", "data": [ { "name": "text", "data": "5" } ] }, { "name": "text", "data": "D" }, { "name": "sub", "data": [ { "name": "text", "data": "4" } ] }, { "name": "text", "data": "→" }, { "name": "sup", "data": [ { "name": "text", "data": "7" } ] }, { "name": "text", "data": "F" }, { "name": "sub", "data": [ { "name": "text", "data": "4" } ] }, { "name": "text", "data": " and " }, { "name": "sup", "data": [ { "name": "text", "data": "5" } ] }, { "name": "text", "data": "D" }, { "name": "sub", "data": [ { "name": "text", "data": "4" } ] }, { "name": "text", "data": "→" }, { "name": "sup", "data": [ { "name": "text", "data": "7" } ] }, { "name": "text", "data": "F" }, { "name": "sub", "data": [ { "name": "text", "data": "3" } ] }, { "name": "text", "data": " of Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": ", respectively. The emission intensity increases gradually with the increment of Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": " concentration when it approaches 8%, and then reduces due to the concentration quenching. Thus the optimum concentration of Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": " is 8% in these oxyfluoride germanate glass." } ] }, { "name": "fig", "data": { "id": "F4", "caption": [ { "lang": "en", "label": [ { "name": "text", "data": "Fig.4" } ], "title": [ { "name": "text", "data": "Emission spectra of Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": " doped germanate glass under 377 nm light excitation" } ] } ], "subcaption": [], "note": [], "graphics": [ { "print": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=21350779&type=", "small": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=21350791&type=", "big": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=21350785&type=" } ] } }, { "name": "p", "data": [ { "name": "xref", "data": { "text": "Fig.5", "type": "fig", "rid": "F5", "data": [ { "name": "text", "data": "Fig.5" } ] } }, { "name": "text", "data": " presents the emission spectra of 8% Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": " doped PG and GCs under the excitation of 377 nm light. The spectra of Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": " doped GCs are similar to those of Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": " doped oxyfluoride germanate glass, which also contain four emission bands peaked at 492, 546, 590, 624 nm. The intensities of green emissions of the glass ceramics increased significantly with the comparison of those of the PG, and also increased with increasing thermal treatment temperature and time. The peak intensity of 546 nm emission of the GCs which were prepared after thermal-treated at 620 ℃ for 3 h, 640 ℃ for 3 h and at 640 ℃ for 6 h increases by about 1.46, 2.05, 2.34 times that of the PG." } ] }, { "name": "fig", "data": { "id": "F5", "caption": [ { "lang": "en", "label": [ { "name": "text", "data": "Fig.5" } ], "title": [ { "name": "text", "data": "Emission spectra of the PG glass, GC620 ℃-3 h, GC640 ℃-3 h and GC640 ℃-6 h glass ceramics under the excitation of 377 nm light." } ] } ], "subcaption": [], "note": [], "graphics": [ { "print": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=21350799&type=", "small": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=21350813&type=", "big": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=21350808&type=" } ] } }, { "name": "p", "data": [ { "name": "xref", "data": { "text": "Fig.6", "type": "fig", "rid": "F6", "data": [ { "name": "text", "data": "Fig.6" } ] } }, { "name": "text", "data": " presents the excitation spectra of the PG and the GCs monitored at 546 nm emission from 290 nm to 510 nm. The excitation spectra show characteristic absorptions of Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": " ion. Two groups are clearly observed from the overall excitation spectra. The strongest excitation band around 377 nm is attributed with the transition " }, { "name": "sup", "data": [ { "name": "text", "data": "7" } ] }, { "name": "text", "data": "F" }, { "name": "sub", "data": [ { "name": "text", "data": "6" } ] }, { "name": "text", "data": "→" }, { "name": "sup", "data": [ { "name": "text", "data": "5" } ] }, { "name": "text", "data": "D" }, { "name": "sub", "data": [ { "name": "text", "data": "3" } ] }, { "name": "text", "data": " of Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": ", while the weak bands centered at 302, 317, 351, 369, 484 nm are originated from the transitions " }, { "name": "sup", "data": [ { "name": "text", "data": "7" } ] }, { "name": "text", "data": "F" }, { "name": "sub", "data": [ { "name": "text", "data": "6" } ] }, { "name": "text", "data": "→ " }, { "name": "sup", "data": [ { "name": "text", "data": "5" } ] }, { "name": "text", "data": "H" }, { "name": "sub", "data": [ { "name": "text", "data": "6" } ] }, { "name": "text", "data": ", " }, { "name": "sup", "data": [ { "name": "text", "data": "5" } ] }, { "name": "text", "data": "H" }, { "name": "sub", "data": [ { "name": "text", "data": "7" } ] }, { "name": "text", "data": ", " }, { "name": "sup", "data": [ { "name": "text", "data": "5" } ] }, { "name": "text", "data": "D" }, { "name": "sub", "data": [ { "name": "text", "data": "2" } ] }, { "name": "text", "data": ", " }, { "name": "sup", "data": [ { "name": "text", "data": "5" } ] }, { "name": "text", "data": "D" }, { "name": "sub", "data": [ { "name": "text", "data": "4" } ] }, { "name": "text", "data": " of Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": ", respectively. Moreover, the intensity of excitation band is enhanced with the increment of thermal treatment temperature and time, which is consisted with the emission spectra." } ] }, { "name": "fig", "data": { "id": "F6", "caption": [ { "lang": "en", "label": [ { "name": "text", "data": "Fig.6" } ], "title": [ { "name": "text", "data": "Excitation spectra of PG glass, GC620 ℃-3 h, GC640 ℃-3 h and GC640 ℃-6 h glass ceramics monitored at 546 nm emission." } ] } ], "subcaption": [], "note": [], "graphics": [ { "print": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=21350818&type=", "small": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=21350827&type=", "big": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=21350823&type=" } ] } }, { "name": "p", "data": [ { "name": "text", "data": "The XEL spectra of Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": "doped PG and GCs are presented in " }, { "name": "xref", "data": { "text": "Fig.7", "type": "fig", "rid": "F7", "data": [ { "name": "text", "data": "Fig.7" } ] } }, { "name": "text", "data": ", which were excited by X-ray(80 kV, 1.5 mA). The spectra are also consisted of four emissions peaked at 488, 542, 585, 620 nm, which are originated from " }, { "name": "sup", "data": [ { "name": "text", "data": "5" } ] }, { "name": "text", "data": "D" }, { "name": "sub", "data": [ { "name": "text", "data": "4" } ] }, { "name": "text", "data": "→" }, { "name": "sup", "data": [ { "name": "text", "data": "7" } ] }, { "name": "text", "data": "F" }, { "name": "sub", "data": [ { "name": "text", "data": "6" } ] }, { "name": "text", "data": ", " }, { "name": "sup", "data": [ { "name": "text", "data": "7" } ] }, { "name": "text", "data": "F" }, { "name": "sub", "data": [ { "name": "text", "data": "5" } ] }, { "name": "text", "data": ", " }, { "name": "sup", "data": [ { "name": "text", "data": "7" } ] }, { "name": "text", "data": "F" }, { "name": "sub", "data": [ { "name": "text", "data": "4" } ] }, { "name": "text", "data": " and " }, { "name": "sup", "data": [ { "name": "text", "data": "7" } ] }, { "name": "text", "data": "F" }, { "name": "sub", "data": [ { "name": "text", "data": "3" } ] }, { "name": "text", "data": " transitions of Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": " ions, respectively. They are similar to the emission spectra under 377 nm light excitation, however, there is slight difference in the peak location due to the different luminescence mechanisms under two different excitations. In comparison with PG sample, XEL intensity of 542 nm emission increases by 6.36, 12.53, 15.76 times for GC620 ℃-3 h, GC640 ℃-3 h and GC640 ℃-6 h samples, respectively. The results present that the emission intensity increases significantly after thermal treatment, meanwhile it is enhanced with increasing thermal treatment temperature and time. The increased XEL intensity of GCs could be attributed to Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": " preferentially incorporated into LaF" }, { "name": "sub", "data": [ { "name": "text", "data": "3" } ] }, { "name": "text", "data": " nanocrystals with low phonon energy. Moreover, as a comparison, the XEL spectra of BGO scintillating crystal with the same thickness under the same excitation were also showed in " }, { "name": "xref", "data": { "text": "Fig.7", "type": "fig", "rid": "F7", "data": [ { "name": "text", "data": "Fig.7" } ] } }, { "name": "text", "data": ". The integrated emission intensity ranging from 300 nm to 800 nm of PG, GC620 ℃-3 h, GC640 ℃-3 h and GC640 ℃-6 h samples is about 2.8%, 16%, 31.1%, 40.3% of that of the BGO crystal.The results approach to the oxyfluoride silicate scintillating glass ceramic containing Lu" }, { "name": "sub", "data": [ { "name": "text", "data": "6" } ] }, { "name": "text", "data": "O" }, { "name": "sub", "data": [ { "name": "text", "data": "5" } ] }, { "name": "text", "data": "F" }, { "name": "sub", "data": [ { "name": "text", "data": "8" } ] }, { "name": "text", "data": " nanocrystals" }, { "name": "sup", "data": [ { "name": "text", "data": "[" }, { "name": "xref", "data": { "text": "4", "type": "bibr", "rid": "R4", "data": [ { "name": "text", "data": "4" } ] } }, { "name": "text", "data": "]" } ] }, { "name": "text", "data": ". The present results indicate that Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": "doped transparent germanate glass ceramics embedded with LaF" }, { "name": "sub", "data": [ { "name": "text", "data": "3" } ] }, { "name": "text", "data": " nanocrystals have a potential application in X-ray detection." } ] }, { "name": "fig", "data": { "id": "F7", "caption": [ { "lang": "en", "label": [ { "name": "text", "data": "Fig.7" } ], "title": [ { "name": "text", "data": "XEL spectra of PG glass, GC620 ℃-3 h, GC640 ℃-3 h and GC640 ℃-6 h glass ceramics and BGO scintillating crystal." } ] } ], "subcaption": [], "note": [], "graphics": [ { "print": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=21350831&type=", "small": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=21350837&type=", "big": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=21350835&type=" } ] } } ] }, { "name": "sec", "data": [ { "name": "sectitle", "data": { "title": [ { "name": "text", "data": "4　Conclusion" } ], "level": "1", "id": "s4" } }, { "name": "p", "data": [ { "name": "text", "data": "Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": "doped transparent germanate GCs embedded with LaF" }, { "name": "sub", "data": [ { "name": "text", "data": "3" } ] }, { "name": "text", "data": " nanocrystals were successfully prepared by melt-quenching and subsequent thermal treatment. And their luminescent properties were investigated in detail. The XRD results demonstrate the crystalline precipitated in the glass matrix was LaF" }, { "name": "sub", "data": [ { "name": "text", "data": "3" } ] }, { "name": "text", "data": " and the corresponding crystal size is in the range of 16-21 nm. Under the excitation of 377 nm light and X-ray, Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": " doped germanate GCs embedded with LaF" }, { "name": "sub", "data": [ { "name": "text", "data": "3" } ] }, { "name": "text", "data": " nanocrystals present more intense emission than Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": " doped germanate glass, and the emission intensity is enhanced with the increment of thermal treatment temperature and time. The maximum integrated XEL intensity of the GCs is approximately 40.3% of that of the commercial BGO scintillating crystal. The results indicate that Tb" }, { "name": "sup", "data": [ { "name": "text", "data": "3+" } ] }, { "name": "text", "data": " doped transparent germanate GCs embedded with LaF" }, { "name": "sub", "data": [ { "name": "text", "data": "3" } ] }, { "name": "text", "data": " nanocrystals have potential application prospects in X-ray detection." } ] }, { "name": "p", "data": [ { "name": "text", "data": "Response Letter is available for this paper at:http://cjl.lightpublishing.cn/thesisDetails#10.37188/CJL.20210117." } ] } ] } ], "footnote": [], "reflist": { "title": [ { "name": "text", "data": "References" } ], "data": [ { "id": "R1", "label": "[1]", "citation": [ { "lang": "en", "text": [ { "name": "text", "data": "FENG H" }, { "name": "text", "data": ", " }, { "name": "text", "data": "ZHUANG L C" }, { "name": "text", "data": ", " }, { "name": "text", "data": "HUANG S M" }, { "name": "text", "data": ", " }, { "name": "text", "data": "et al" }, { "name": "text", "data": ". 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