UPCONVERSION FLUORESCENCE IN ZnWO 4:Er 3+ CRYSTAL BY LD EXCITED
ZANG Jingcun, LIU Yanhang, CHEN Xiaobo, HAO Zhao, WANG Weiqin, YIE Jianping
Imaging Science and Photochemistry . 1998, (2): 127 -131 .  DOI: 10.7517/j.issn.1674-0475.1998.02.127