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湖南师范大学 化学化工学院 资源精细化与先进材料湖南省高校重点实验室, 湖南 长沙 410081
纸质出版日期:2010-9-21,
网络出版日期:2010-9-21,
收稿日期:2009-7-16,
修回日期:2009-9-27,
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周 文, 余丽萍, 廉世勋, 祁 媛, 朱爱玲, 荣春英. 前驱溶液的pH值对制备Ca<sub>2</sub>Zn<sub>4</sub>Ti<sub>16</sub>O<sub>38</sub> ∶ Pr<sup>3+</sup>,Na<sup>+</sup> 发光粉物相、形貌和发光性质的影响[J]. 发光学报, 2010,31(5): 712-718
ZHOU Wen, YU Li-ping, LIAN Shi-xun, QI Yuan, ZHU Ai-ling, RONG Chun-ying. Influence of pH Value in Precursor Solution on the Component, Morphology and Photoluminescence of Ca<sub>2</sub>Zn<sub>4</sub>Ti<sub>16</sub>O<sub>38</sub> ∶ Pr<sup>3+</sup>, Na<sup>+</sup> Phosphor[J]. 发光学报, 2010,31(5): 712-718
周 文, 余丽萍, 廉世勋, 祁 媛, 朱爱玲, 荣春英. 前驱溶液的pH值对制备Ca<sub>2</sub>Zn<sub>4</sub>Ti<sub>16</sub>O<sub>38</sub> ∶ Pr<sup>3+</sup>,Na<sup>+</sup> 发光粉物相、形貌和发光性质的影响[J]. 发光学报, 2010,31(5): 712-718 DOI:
ZHOU Wen, YU Li-ping, LIAN Shi-xun, QI Yuan, ZHU Ai-ling, RONG Chun-ying. Influence of pH Value in Precursor Solution on the Component, Morphology and Photoluminescence of Ca<sub>2</sub>Zn<sub>4</sub>Ti<sub>16</sub>O<sub>38</sub> ∶ Pr<sup>3+</sup>, Na<sup>+</sup> Phosphor[J]. 发光学报, 2010,31(5): 712-718 DOI:
以钛酸丁酯、醋酸钙、醋酸锌、柠檬酸和乙二醇为原料
采用溶胶-凝胶法制备Ca
2
Zn
4
Ti
16
O
38
∶ Pr
3+
Na
+
发光粉。研究了前驱溶液的pH值对溶胶-凝胶转变过程、发光粉物相组成、样品形貌和发光性质的影响。通过热重-差热分析(TG/DTA)、X射线衍射(XRD)分析、扫描电子显微镜(SEM)对前驱物分解、发光粉物相和颗粒大小进行了研究。采用荧光光谱对材料的光谱性质进行了表征。研究发现前驱溶液pH 3时
所得发光粉样品为蓬松的、颗粒均匀的单相Ca
2
Zn
4
Ti
16
O
38
粉末
红色余辉时间较长;随着pH值增大
逐渐有杂质相TiO
2
、CaTiO
3
和Zn
2
TiO
4
生成
并且样品颗粒逐渐变大
颗粒团聚呈现不规则形状
余辉时间变短。结果表明
只有在pH 3条件下以溶胶-凝胶法制备Ca
2
Zn
4
Ti
16
O
38
∶ Pr
3+
Na
+
发光粉下才能获得被日光有效激发
并呈现余辉衰减慢的红色长余辉(644 nm)发光。
The phosphor Ca
2
Zn
4
Ti
16
O
38
∶ Pr
3+
Na
+
has received increasing interest owing to its high chemical stability
broad red emission and special long afterglow properties. However
the sintering temperature for obtaining pure Ca
2
Zn
4
Ti
16
O
38
∶ Pr
3+
Na
+
is confirmed to be 950 ℃ and the sintering period is 21 h for sol-gel synthesis of this phosphor. So
optimization of synthesis conditions of Ca
2
Zn
4
Ti
16
O
38
must be carried out.It is most important to get uniform and transparent gel in the sol-gel process. The results show that the mixture solution is clarification when pH 3 (adjusted by HNO
3
solution).While increasing the pH value (adjusted by ammonia solution) the mixture solution begin to come forth muddy. After dried in 150 ℃
the exrogel shows yellow color under pH 3 and others present black. After further heated at 400 ℃ for 2 h
a dark dry gel is obtained and ground in an agate mortar to black powder serving as the precursor for the present work. The final phosphor powder is obtained after reheated at 900 ℃ for 8 h. Crystalline phases
morphology and photoluminescence properties have been characterized by using powder X-ray diffractometry (XRD)
scanning electron microscopy (SEM) and fluorescence spectrophotometer
respectively. XRD patterns show that the synthesized Ca
2
Zn
4
Ti
16
O
38
powders possess well structure when pH 3. Extra-resultants such as CaTiO
3
Zn
2
TiO
4
and TiO
2
appeared when pH 5.The SEM results showed that the samples obtained at pH 3 are fleecy and uniform. With the increasing pH value
particles gradually become larger
the reunion and sinter phenomenon become seriousevident.TG-DAT curves reveal the different various trends for the precursors of pH=3 and pH=9. The electrical alkoxy-OR of Ti (OC
4
H
9
)
4
make metal ions Ti
4+
highly vulnerable by nucleophilic attack. Ti (OC
4
H
9
)
4
easily hydrolyzes or polymerizes no matter what in acid or alkaline conditions. When pH3
H
+
speeds up the hydrolysis of Ti (OC
4
H
9
)
4
and to replace the form of coordination of tetrabutyl titanate alkoxy
direct bonding with titanium ion formed by hydrolysis of Ti (OH)
<
em
>
x(AC)
<
em
>
y(with
x+y
=4). However
when pH=9
a large number of OH
-
ions exists in Ti (OC
4
H
9
)
4
hydrolysis and produces Ti(OH)
4
or TiO(OH)
2
and that the other cations Ca
2+
Zn
2+
and Pr
3+
from Ca(OH)
2
Zn(OH)
2
and Pr(OH)
3
will not mixe with each other effectively and will not form other phases. Thereby
keeping the pH 3 is necessary for cations to uniformly mix to inhibit Ti (OC
4
H
9
) directly hydrolyzed to form Ti (OH)
4
precipitation. Excitation and emission spectra indicate that the phosphors exhibit the highest excitation bands in the visible region in the ranges of 450~495 nm originated from 4f4f transition
as well as red emitting of Pr
3+
at 613 nm(
1
D
2
3
H
4
)and 644 nm (
3
P
0
3
F
2
) when pH3
which result in
upon excitation with 475 nm
the red emission at 644 nm decays slower than that of pH 5. This fact suggests that Ca
2
Zn
4
Ti
16
O
38
∶ Pr
3+
Na
+
obtained via acid sol-gel process (pH 3) gives the good red long afterglow under visible light irradiation.
Ca2Zn4Ti16O38 ∶ Pr3+溶胶-凝胶法pH值红色发光粉长余辉
Ca2Zn4Ti16O38 ∶ Pr3+sol-gel methodpH valuered phosphorlong afterglow
Diallo P T, Boutinaud P, Mahiou R, et al. Red luminescence in Pr3+-doped calcium titanates
. Phys. Stat. Sol. (a), 1997, 160 (1):255-263.
Lian S X, Lin J H, Su M Z. Synthesis and luminescent properties of Ca1-xZnxTiO3 ∶ Pr3+ , R+(R+=Li+ , Na+ , K+ , Rb+ , Cs+ ,Ag+ )
. J. Chin. Soc. Rare Earths (中国稀土学报), 2001, 19 (6):602-605 (in Chinese).
Yamamotoa H, Okamotob S, Kobayashib H. Luminescence of rare-earth ions in perovskite type oxides:from basic research to applications
. J. Lumin., 2002, 100 (1-4):325-332.
Tang W J, Chen D H. Photoluminescent properties of (Ca,Zn)TiO3 ∶ Pr,B particles synthesized by the peroxide-based route method
. J. Am. Ceram. Soc., 2007, 90 (10):3156-3159.
Lian S X, Zuo C G, Yin D L, et al. Preparation and characterization of red luminescent Ca0.8Zn0.2TiO3 ∶ Pr3+ , Na+ nanophosphor
. J. Rare Earths, 2006, 24 (2):29-33.
Zhang X M, Zhang J H, Zhang X, et al. Size manipulated photoluminescence and phosphorescence in CaTiO3 ∶ Pr3+ nanoparticles
. J. Phys. Chem. C, 2007, 111 (49):18044-18048.
Zhou X M, Li B W, Zeng H H, et al. Improvement of the long lasting phosphorescence materials (Ca,Zn) TiO3 ∶ Pr by surface treatment
. J. Chin. Soc. Rare Earths (中国稀土学报), 2008, 29 (1):28-31 (in Chinese).
Lian S X, Li X Y, Yin D L, et al. Effects of solid solution structures on luminescence of Ca2- xSrxZn4Ti15O36 ∶ Pr3+
. Chin. J. Inorganic. Chem.(无机化学学报), 2006, 22 (2):336-340 (in Chinese).
Yang Z P, Zhu S C, Guo Zhi, et al. Study on two kinds of electron trapped of red long-afterglow phosphors CaTiO3 ∶ Pr3+
. Journal of OptoelectronicsLaser (光电子激光), 2004, 15 (3):332-336 (in Chinese).
Zhang W P, Yin M. Preparration and properties of nanometric scale luminescent materials doped by rare earth
. Chin. J. Lumin. (发光学报), 2000, 21 (4):314-319 (in Chinese).
Qi Y, Lian S X, Yu L P, et al. Synthesis and persistent properties of phosphor Ca2Zn4Ti16O38 ∶ Pr3+ , Na+
. Chin. J. Inorganic. Chem.(无机化学学报), 2009, 25 (2):218-222 (in Chinese).
Komarneni S. Sol-gel Synthesis and Processing
. Westerville, Ohio: American Ceramic Society, 1998, 7-8.
Ma Y L, Wang Y. Study on the sol-gel transition process of tetrabutyltitanate-barium acetate acetic acid system
. Chin. J. Appl. Chem. (应用化学), 2002, 19 (5):450-454 (in Chinese).
Wang R B, Dai S Y, Wang K J. The influence of pH to prepare TiO2 by sol-gel and the characteristics
. Chin. J. Func. Mater.(功能材料), 2002, 3 (33):296-302 (in Chinese).
Hui L, Tang Z L, Luo S H, et al. Influences of precursor pH value on the sol-gel prepared LiFePO4
. Chin. Rare Metal Mate. Eng.(稀有金属材料与工程), 2007, 36 (1):121-123 (in Chinese).
Peng T Y, Liu X, Dai K, et al. Effect of acidity on the glycine-nitrate combustion synthesis of nanocrystalline alumina powder
. Mater. Res. Bull, 2006, 41 (9):1638-1645.
Pathak L C, Singh T B, Das S, et al. Effect of pH on the combustion synthesis of nano-crystalline alumina powder
. J. Mater. Lett., 2002, 57 (2):380-385.
Wang C N, Wang M Y, Zhang W P, et al. Influence of acidity on properties of combustion derived Y2O3 ∶ Eu3+ phosphors
. J. At. Mo. Phys., 2008, 25 (4):760-766.
Dillo P T, Jeanlouis K, Boutinaud P, et al. Improvement of the optical performances of Pr3+ in CaTiO3
. J. Alloys Compd., 2001, 323-324 :218-222.
Shen L J, Zhang Z Q, Li H, et al. Efffect of Zn,Cd on the luminescent properties of CaTiO3 ∶ Pr3+
. Chin. J. Lumin.(发光学报), 2007, 28 (1):74-78 (in Chinese).
Fu Z L, Zhou S H, Pan T Q, et al. Preparation and luminescent properties of cubic Eu3+ ∶ Y2O3 nanocrystals and comparison to bulk Eu3+ ∶ Y2O3
. J. Lumin., 2007, 124 (2):216-513.
Zhang J H, Jia M L, Lu S Z, et al. Study on UV excitation properties of Eu3+at S6 site in bulk and nanocrystalline cubic Y2O3
. J. Rare Earths, 2004, 22 (1):45-48.
Yang Z, Lin J H, Su M Z. LnBaB9O16 ∶ Pr3+ (Ln=La, Y) of Pr3+ in the two-photon emission
. Sci. China, Ser. B (中国科学 B辑), 2001, 31 (1):37-41 (in Chinese).
Kyomen T, Sakamoto R, Sakamoto N, et al. Photoluminescence properties of Pr-doped (Ca,Sr,Ba)TiO3
. J. Chem. Mater, 2005, 17 (12):3200-3204.
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