UPCONVERSION FLUORESCENCE IN ZnWO4:Er3+ CRYSTAL BY LD EXCITED
ZANG Jingcun1, LIU Yanhang1, CHEN Xiaobo2, HAO Zhao2, WANG Weiqin3, YIE Jianping3
1. Department of Chemical and Environmental Engineering, Beijing Polytechnic University, Beijing 100022, P. R. China; 2. Department of Physics Nankai University, Tianjin 300071, P. R. China; 3. Institute of Photographic Chemistry, The Chinese Academy of Sciences, Beijing 100101, P. R. China