CJCU
Synthesis and Up-conversion Luminescence Properties of Nanocrystal Yb, Ho Co-doped Sodium Yttrium Fluoride
YANG Feng-Zhen, YI Guang-Shun, CHEN De-Pu, CHENG Jing
Chem. J. Chinese Universities . 2004, (9): 1589 -1592 .