CHEN Zhe, LIU Zhen-yu, ZHAO Dan, QIN Wei-ping. Effect of Reactants Concentration on NaYF<sub>4</sub>:Yb<sup>3+</sup>,Tm<sup>3+</sup> Crystalline Phase[J]. Chinese Journal of Luminescence, 2011,32(9): 853-857
CHEN Zhe, LIU Zhen-yu, ZHAO Dan, QIN Wei-ping. Effect of Reactants Concentration on NaYF<sub>4</sub>:Yb<sup>3+</sup>,Tm<sup>3+</sup> Crystalline Phase[J]. Chinese Journal of Luminescence, 2011,32(9): 853-857DOI:
Effect of Reactants Concentration on NaYF4:Yb3+,Tm3+ Crystalline Phase
upconversion particles (UCPs) with different morphology were prepared by the facile hydrothermal approach. The morphology
crystalline phase and optical properties were characterized by scanning electron microscopy (SEM)
X-ray diffraction (XRD) and luminescent spectra. XRD patterns and SEM images showed that the UCPs crystalline phase tansformed from cubic phase to hexagonal phase by controlling the reactants concentration. Pumped with 980 nm diode laser
the UCPs emitted bright violet/blue upconversion luminescence. By analyzing the effect of reactants concentration on the products crystalline phase
the crystal growth mechanism of NaYF
4
was studied in detail. Significantly
our research work would provide more experimental data for controlling the crystalline phase of the upconversion luminescent materials.
关键词
Keywords
references
Wang Zhenling, Chan Helen L W, Li Hiuling, et al. Highly efficient low-voltage cathodoluminescence of LaF3:Ln3+(Ln=Eu3+, Ce3+,Tb3+) spherical particles [J]. Appl. Phys. Lett., 2008, 93 (14):141106-1-3.[2] Chen Huan, Chuai Xiaohong, Wang Lili, et al. Synthesis and optical properties of water soluble upconversion NaYF4:Yb, Tm nanoparticles [J]. Chin. J. Lumin. (发光学报), 2010, 31 (4):538-542 (in Chinese).[3] Sun Jiayue, Yang Zhiping, Du Haiyan. Upconversion luminescence properties of NaYF4:Tm3+, Yb3+ synthesized by co-precipitation method [J]. Chin. J. Lumin. (发光学报), 2009, 30 (2):195-200 (in Chinese).[4] Re Qi, Dai Rucheng, Shen Yuhua, et al. Color design based on upconversion luminescence of NaYF4:Yb3+,Er3+ [J]. Chin. J. Lumin. (发光学报), 2010, 31 (1):69-74 (in Chinese).[5] Krmer K W, Biner D, Frei G, et al. Hexagonal sodium yttrium fluoride based green and blue emitting upconversion phosphors [J]. Chem. Mater., 2004, 16 (7):1244-1251.[6] Li Chunxia, Zhang Cuimiao, Hou Zhiyao, et al. -NaYF4 and -NaYF4:Eu3+ microstructures: Morphology control and tunable luminescence properties [J]. J. Phys. Chem. C, 2009, 113 (6):2332-2339.[7] Yu Xuefeng, Li Min, Xie Mengyin, et al. Dopant-controlled synthesis of water-soluble hexagonal NaYF4 nanorods with efficient upconversion fluorescence for multicolor bioimaging [J]. Nano Research, 2010, 3 (1):51-60.[8] Liang Lifang, Xu Huifang, Su Qiang, et al. Hydrothermal synthesis of prismatic NaHoF4 microtubes and NaSmF4 nanotubes [J]. Inorg. Chem., 2004, 43 (5):1594-1596.[9] Liang Xin, Wang Xun, Zhuang Jing, et al. Branched NaYF4 nanocrystals with luminescent properties [J]. Inorg. Chem., 2007, 46 (15):6050-6055.[10] Sun Yajuan, Chen Yue, Tian Lijin, et al. Controlled synthesis and morphology dependent upconversion luminescence of NaYF4:Yb, Er nanocrystals [J]. Nanotechnology, 2007, 18 (27):275609-1-9.[11] Li Chenxia, Quan Zewei, Yang Jun, et al. Highly uniform and monodisperse -NaYF4:Ln3+ (Ln=Eu, Tb, Yb/Er, and Yb/Tm) hexagonal microprism crystals: Hydrothermal synthesis and luminescent properties [J]. Inorg. Chemistry, 2007, 46 (16):6329-6337.[12] Wang Legu, Li Yadong. Controlled synthesis and luminescence of lanthanide doped NaYF4 nanocrystals [J]. Chem. Mater., 2007, 19 (4):727-734.[13] Wang Xue, Zhuang Jing, Peng Qing, et al. Hydrothermal synthesis of rare-earth fluoride nanocrystals [J]. Inorg. Chem., 2006, 45 (17):6661-6665.[14] Peen R L, Banfield J F. Oriented attachment and growth, twinning, polytypism, and formation of metastable phases: Insights from nanocrystalline TiO2 [J]. American Mineralogist, 1998, 83:1077-1082.[15] Peen R L, Banfield J F. Imperfect oriented attachment: dislocation generation in defect-free nanocrystals [J]. Science, 1998, 281 (5379):969-971.[16] Ostwald W Z. Studies of the formation and transformation of solid substances [J]. Phys. Chem., 1897, 22 (2):289-302.[17] Wang Guofeng, Qin Weiping, Wang Lili, et al. Intense ultraviolet upconversion luminescence from hexagonal NaYF4:Yb3+/Tm3+ microcrystals [J]. Optics Express, 2008, 16 (16):11907-11914.