Upconversion luminescence of NaYF_4:Yb,Er nanocrystals with high uniformity  

作　　者：叶杨森 江志浩 王棋正 朱子疏 王潇 随志磊 代如成 王中平 张增明 丁泽军 

机构地区：[1]Department of Physics University of Science and Technology of China [2]The Centre for Physical Experiments University of Science and Technology of China [3]Hefei National Laboratory for Physical Sciences at Microscale University of Science and Technology of China

出　　处：《Journal of Rare Earths》2014年第9期802-805,共4页稀土学报（英文版）

基　　金：Project supported by Fund for Fostering Talents in Basic Science of the National Natural Science Foundation of China(J1103207);the National Natural Science Foundation of China(11274288,21002097);the National Basic Research Program of China(2011CB932801,2012CB933702);Ministry of Education of China(20123402110034)

摘　　要：The NaYF4：Yb,Er nanocrystals were synthesized via the thermal decomposition ot metal oleate precursors, lhe nanocrys- tals in hexagonal structure were highly uniform and in size of 25 nm. The bright upconversion luminescence was observed under the excitation of 980 nm laser and the upeonversion emission spectra were investigated at different pump powers. The emission intensity ratio of red light to green light linearly increased with pump power increasing. This result indicated that there existed a large threshold power of saturation pump for the first excitation state in NaYFa：Yb,Er nanocrystals comparing to that in bulk material.The NaYF4：Yb,Er nanocrystals were synthesized via the thermal decomposition ot metal oleate precursors, lhe nanocrys- tals in hexagonal structure were highly uniform and in size of 25 nm. The bright upconversion luminescence was observed under the excitation of 980 nm laser and the upeonversion emission spectra were investigated at different pump powers. The emission intensity ratio of red light to green light linearly increased with pump power increasing. This result indicated that there existed a large threshold power of saturation pump for the first excitation state in NaYFa：Yb,Er nanocrystals comparing to that in bulk material.

关 键 词：upconversion luminescence NANOCRYSTALS NaYF4：Yb Er rare earths 

分 类 号：TQ422[化学工程] TB383.1[一般工业技术—材料科学与工程]