Er^(3+)/Yb^(3+)掺杂氟硅铅酸盐微晶玻璃的上转换发光

Upconversion of Er^(3+)/Yb^(3+) doped lead fluosilicate microcrystalline glass

制备了微晶体尺寸大约在10—12nm范围内的Er3+,Yb3+共掺杂透明氟硅铅酸盐微晶玻璃.相同功率激发下,纳米微晶玻璃中Er3+离子的2H11/2,4S3/2→4I15/2的绿色上转换荧光和4F9/2→4I15/2的红色上转换荧光强度相对于氟氧化物玻璃分别提高25倍和6倍.随着激发功率的增加,绿、红上转换强度比在氟硅铅酸盐微晶玻璃中显著减小而在氟硅铅酸盐玻璃中近似不变.基于纳米微晶体基质声子能量特征和稀土离子间的能量传递行为,分析了纳米微晶玻璃上转换光谱特性变化的原因.

Transparent Er 3＋/Yb 3＋ co-doped lead fluosilicate glass ceramics is prepared,which contains nano crystalline with size of 10—12 nm.The up-conversion emission in oxyfluoride glass ceramics is notably stronger than that in its glass counterpart.The green luminescence intensity of the 2 H 11/2（4S3/2）→4I15/2 transition and the red luminescence intensity of 4F 9/2→4I 15/2 transition in the glass ceramics are 26 and 6 times stronger than those in its glass counterpart,respectively.The ratio of the green emission intensity to the red one for the lead fluosilicate glass ceramics decreases abviously, while it is almost a constant for the lead fluosilicate glass. It is believed that the low phonon energy in nanocrystallines and the changed energy transfer properties result in the enhancement of the up-conversion emission and the variation of the up-conversion spectra.