掺Er3+氟氧化物玻璃陶瓷的直接上转换敏化发光

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Pb_xCd_1-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 关键词： 直接上转换敏化 氟氧化物玻璃陶瓷 上转换合作辐射荧光

DIRECT UPCONVERSION SENSITIZATION LUMINESCENCE OF Er:OXYFLUORIDE GLASSCERAMICS

This paper researches the direct up-conversion sensitization luminescence of ErY b codoped oxyfluoride glassceramics(ErYb:FOV) excited by CW 966nm-diode laser.It is found that the upconversion mechanism of direct upconversion sensitization l uminescence of YbEr:FOV sample is mainly the energy transfer between Er^{3+ and Yb3+ ion but not the step-by-step absorption of single Er3+}ion.This oxyfluoride vitroceramics is forming Pb_xCd_1-x F₂ 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 vari ation of up-conversion luminescence intensity with laser power emerges a kind of “typical saturation phenomenon”,in which F-P curve is bended gradually result ing from population exhausting in ground state.We also find a new kind of up-con version cooperative radiation fluorescence originating from a kind of Couple Sta te of cluster consisting of two Yb³⁺ions in this ErYb:FOV.