Enhanced Red Emission from GdF3:Yb3+,Er3+ Upconversion Nanocrystals by Li+ Doping and Their Application for Bioimaging

Wenyan Yin, Dr. Lina Zhao, Liangiun Zhou, Dr. Zhanjun Gu, Xiaoxiao Liu, Gan Tian, Shan Jin, Liang Yan, Wenlu Ren, Prof. Gengmei Xing, Prof. Yuliang Zhao Chinese Academy of Sciences Chemistry - A European Journal 18 (30) (2012)