摘要
在 93 0nm二极管光源激发下 ,在Yb3+ -Ho3+ 氟氧化物中得到了较强的蓝绿上转换荧光 .绿光是通过 .Yb3+ -Ho3+ 间的能量传递从而实现Ho3+ 5S2 能级粒子数的布居 ,再向5I8弛豫产生的 .而产生蓝光的途径有两种 ,一是位于Ho3+的3K8能级上的粒子向基态5I8弛豫 ,二是Yb3+ -Yb3+ 离子对的共协上转换荧光 .同时认为 ,在共掺Yb3+ -Ho3+ 系统中能量传递与共协上转换同时存在 ,正是这种共存决定了蓝光段的荧光峰位随着Ho3+
There exist intense green and blue up-converted luminescence in Yb 3+ -Ho 3+ codoped oxy-fluoride under 930 nm diode light excitation. Green luminescence is obtained through transition from Ho 3+ excited 5 S 2 populated by energy transfer between Yb 3+ and Ho 3+ to its ground state 5 I 8 andthere are two ways to generate blue luminescence: one of them is the transition from Ho 3+ excited states 3 K 8 to its ground state 5 I 8 ;the other is the cooperative up-conversion luminescence between Yb 3+ and Yb 3+ . At the same time ,we thinkthat energy transfer between Yb 3+ and Ho 3+ exist together with cooperative up-conversion between Yb 3+ and Yb 3+ in Yb 3+ -Ho 3+ co-doed system which causes the special phenomena i.e. peak wavelengths of blue bands change with the change of Ho 3+ doped concentration.
出处
《湘潭大学自然科学学报》
CAS
CSCD
2002年第4期29-32,共4页
Natural Science Journal of Xiangtan University
基金
国家 8 63项目 (编号 2 0 0 2AA3 2 40 3 0 )
