Xue Xiao-Jie, Qin Weiping, Zhang Dai-Sheng, Zhao Dan, Wei Guo-Dong, Zheng Ke-Zhi, Wang Li-Li, Wang Guo-Feng
State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, PR China.
J Nanosci Nanotechnol. 2010 Mar;10(3):2028-31. doi: 10.1166/jnn.2010.2133.
NaYF4:Yb3+,Tm3+ upconversion nanocrystals were synthesized with oleic acid as a capping ligand. The as-prepared samples were redispersed in cyclohexane, forming transparent and stable solutions which perform bright blue upconversion. Inducing TiO2 as the outer layer of the fluoride cores, we investigated the effect of TiO2 on the upconversion process. The transmission electron microscopy (TEM) analysis indicated that titania successfully formed a coating layer on the surface of NaYF4:Yb3+, Tm3+ nanoparticles, and the average diameters of the NaYF4:Yb3+,Tm3+ nanocrystals and the NaYF4:Yb3+, Tm3+/TiO2 nanoparticles are about 14 and 40 nm, respectively. Under the excitation of a 980 nm laser, NaYF4:Yb3+, Tm3+ nanocrystals and TiO2-coated NaYF4:Yb3+, Tm3 core/shell structure sample exhibited distinct upconversion luminescent properties.
以油酸作为封端配体合成了NaYF4:Yb3+,Tm3+上转换纳米晶体。将制备好的样品重新分散在环己烷中，形成具有明亮蓝色上转换性能的透明稳定溶液。通过在氟化物核外层引入TiO2，我们研究了TiO2对上转换过程的影响。透射电子显微镜（TEM）分析表明，二氧化钛成功地在NaYF4:Yb3+, Tm3+纳米颗粒表面形成了涂层，NaYF4:Yb3+,Tm3+纳米晶体和NaYF4:Yb3+, Tm3+/TiO2纳米颗粒的平均直径分别约为14和40纳米。在980nm激光激发下，NaYF4:Yb3+, Tm3+纳米晶体和TiO2包覆的NaYF4:Yb3+, Tm3核壳结构样品表现出明显的上转换发光特性。
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