Author/Authors :
Qin، نويسنده , , Ruifei and Song، نويسنده , , Hongwei and Pan، نويسنده , , Guohui and Hu، نويسنده , , Lanying and Yu، نويسنده , , Hongquan and Li، نويسنده , , Suwen and Bai، نويسنده , , Xue and Fan، نويسنده , , Libo and Dai، نويسنده , , Qilin and Ren، نويسنده , , Xinguang and Zhao، نويسنده , , Haifeng and Wang، نويسنده , , Tie، نويسنده ,
Abstract :
In this paper, NaYF4 nanocrystals and NH4Y3F10 sub-microcrystals were prepared using a polyol method. After being annealed, NH4Y3F10 can convert into YF3, which is a very efficient host matrix for upconversion. The structures of obtained NaYF4, NH4Y3F10 and YF3 samples are pure cubic phase, a mixture of cubic and hexagonal phase and pure orthorhombic phase, respectively. The size of obtained NaYF4 nanocrystals is about 20 nm, and those of NH4Y3F10 and YF3 sub-microcrystals are both about 200 nm. When co-doped with Er3+ and Yb3+, NaYF4 and YF3 samples can emit bright light under 978 nm excitation. Upconversion mechanisms in Yb3+/Er3+ co-doped NaYF4 and YF3 samples were discussed.
