中国科学院南京天文光学技术研究所机构知识库

Photon-induced luminescence degradation of Ce, Yb co-doped yttrium aluminum garnet phosphors with different Yb concentrations under 457 nm irradiation is studied for the first time, to the best of our knowledge. The degradation behavior is more significant in nano-phosphors prepared via the solgel method, compared with bulkier samples prepared via solid-state reaction. Photoluminescence intensity of Ce3+ ions experiences a drop after initial illumination, due to photoionization of Ce3+ ions, whereas the down-converted luminescence of Yb3+ ions remains relatively stable. Co-doping Yb3
contributes to the luminescence drop of Ce3+ with the excessive Yb3+ ions serving as additional electron traps. The results are in support of a charge transfer process.