摘要
研究了ErYb共掺的氟氧化物玻璃陶瓷的直接上转换敏化发光现象 ,发现其上转换机理主要是Er3 +与Yb3 +离子间的能量传递上转换而不是Er3 +离子的步进多光子吸收 .研究发现由于稀土离子优先富集到PbxCd1-xF2 微晶中 ,形成数个稀土离子组成的耦合团 ,使其存在强烈的团簇效应 ,一方面导致了上转换荧光非常强 ,另一方面也导致了上转换荧光随抽运激光功率的对数变化F P曲线存在逐渐弯曲的“典型”饱和现象 .还发现在ErYb共掺的氟氧化物玻璃陶瓷中 ,两个处在激发态的Yb3 +离子形成了团簇的耦合态2 F25/ 2 F5/ 2 (Yb3+Yb3+) ,它在 96
This paper researches the direct up\|conversion sensitization luminescence of ErYb codoped oxyfluoride glassceramics(ErYb:FOV) excited by CW 966?nm\|diode laser.It is found that the upconversion mechanism of direct upconversion sensitization luminescence of YbEr:FOV sample is mainly the energy transfer between Er 3+ and Yb 3+ ion but not the step\|by\|step absorption of single Er 3+ ion.This oxyfluoride vitroceramics is forming Pb\- x Cd 1- x F\-2 fluoride micro\|crystallines.And the rare earth ions tend to concentrate in the micro\|crystalline,in which there is an intense cluster effect.So upconversion luminescence is very strong. On the other hand,the log\|log variation of up\|conversion luminescence intensity with laser power emerges a kind of “typical saturation phenomenon”,in which F\|P curve is bended gradually resulting from population exhausting in ground state.We also find a new kind of up\|conversion cooperative radiation fluorescence originating from a kind of Couple State of cluster consisting of two Yb 3+ ions in this ErYb:FOV.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2000年第12期2482-2487,共6页
Acta Physica Sinica
基金
国家自然科学基金!(批准号 :198740 33)
中国科学院物理研究所光物理开放研究实验室资助
中国科学院半导体研究所集成光电子学国家重
关键词
直接上转换敏化
氟氧化物玻璃陶瓷
掺铒
发光
direct up\|conversion sensitization, oxyfluoride glassceramics, up\|conversion cooperative radiation fluorescence
