在980nm激发下,研究了Er3+、Yb3+和Tb3+单掺或共掺氟氧锗酸盐玻璃的上转换发光性质和机理.室温下,观察到了强的绿色和红色上转换发光,其发光中心位于524、546和658nm处,分别对应于Tb3+离子的5D4→7FJ(J=5和0)和Er3+离子的(2H11/2、4S3/2和4F9/2)→4I15/2跃迁.研究了ThF3、YbF3掺杂浓度以及激光功率对上转换发光强度的影响,讨论了Er3+、Yb3+和Tb3+之间的能量传递和上转换机理.
Up-conversion luminescence properties and energy-transfer processes in Er3+ , Yb3+ and Tb3+ single doped or codoped oxyfluorogermanate glasses were studied under 980nm laser excitation. Green and red up-conversion emissions around 524, 546 and 658nm which can be assigned to the Tb3+: 5D4→7FJ(J=5 and 0) and Er3+: (2H11/2, 4S3/2and 4F9/2)→4I5/2 transitions , respectively, were strongly observed at room temperature. Up-conversion luminescence intensity depended on the YbF3, TbF3 concentration and excitation power density. The energy transfer processes among Er3+ , Yb3+ and Tb3+, and up-conversion mechanisms were discussed.
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