Zhang Daisheng, Qin Weiping, Wang Guofeng, Wei Guodong, Wang Lili, Zhu Peifen, Kim Ryongjin, Ding Fuheng, Zheng Kezhi, Liu Ning
State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, PR China.
J Nanosci Nanotechnol. 2010 Mar;10(3):2032-5. doi: 10.1166/jnn.2010.2153.
YF3:Yb3+, Tm3+ microcrystals were prepared by a microemulsion method. The microcrystals were coated with TiO2 by hydrolysis of titanium n-butoxide (TBOT). Transform electron microscopy and X-ray diffraction were used to characterize the core/shell materials. The results indicated that the low TBOT/YF3 molar ratio was favorable to preparing the uniform TiO2 coatings. The upconversion luminescence properties of YF3:Yb3+, Tm3+ and TiO2-coated YF3:Yb3+, Tm3+ microcrystals were studied under 980-nm excitation. The 1I6 --> 3H6, 1I6 --> 3F4, 1D2 --> 3H6, 1D2 --> 3F4, 1G4 --> 3H6, and 1G4 --> 3F4 emissions were observed. The upconversion mechanisms were discussed in detail.
采用微乳液法制备了YF3:Yb3 +、Tm3 +微晶。通过正丁醇钛（TBOT）水解在微晶表面包覆TiO2。利用透射电子显微镜和X射线衍射对核壳材料进行表征。结果表明，较低的TBOT/YF3摩尔比有利于制备均匀的TiO2包覆层。研究了YF3:Yb3 +、Tm3 +和TiO2包覆的YF3:Yb3 +、Tm3 +微晶在980 nm激发下的上转换发光特性。观察到1I6→3H6、1I6→3F4、1D2→3H6、1D2→3F4、1G4→3H6和1G4→3F4发射。详细讨论了上转换机制。
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