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摘要
There is a critical value of quenching concentration or optimal doping concentration in the laser glass due to the concentration quenching effect. It is particularly important to quickly and effectively determine the luminescent quenching concentration. In this paper， a semi-quantitative method is established for predicting the quenching concentration of laser glass by studying the relationship between the population of excited states of rare earth ions in glass and the doping concentration. It is found that the linear correlation between the transition rate of spontaneous emission and doping concentration is greater than its squared correlation with a concentration in Nd3+-doped phosphate glass. This indicates that OH- affects more to the transition probability of spontaneous emission than the energy transfer process between rare earth ions. The fluorescence lifetime at low concentration is selected instead of the spontaneous radiative lifetime to predict the quenching concentration， which effectively reduced the influence of multi-phonon relaxation and OH-， and the absolute error between the predicted luminescence quenching concentration and the experimental value was reduced from 0.82% to 0.16%. The proposed prediction calculation method has high accuracy and strong universality. This work guides determining the quenching concentration of laser glass and is beneficial to the research and exploration of a new type of laser glass. ? 2023 Chines Academy of Sciences.
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单位发光材料与器件国家重点实验室; 华南理工大学
