含无辐射过程四能级GSA/ESA上转换发光的理论分析(英文)

Theoretical Analysis of Four-level GSA/ESA Upconverted Luminescence Containing a Nonradiative Process

不同于通常的三能级GSA/ESA上转换系统,给出了一个包含无辐射弛豫过程的四能级上转换系统,利用速率方程模型,从理论上分析了其上转换动力学过程和发光特性.结果表明,体系上转换的上升过程由所包含能级的无辐射弛豫速率决定,而衰减过程主要由终态能级的弛豫速率决定.

Unlike conventional three-level GSA/ESA upconversion system, a four-level GSA/ESA upconversion system containing a nonradiative process is presented. The dynamic process and luminescent properties of the upconversion are analyzed theoretically by rate equation model. The results show that the rise process of the upconversion is dominated by the nonradiative relaxation rate of the middle nonradiative level, while the decay process is mainly governed by the relaxation rate of the final excited state level.