改进的反Stokes能量传递对ErP5O14非晶中荧光动力学研究的影响

本文通过建立不同浓度五磷酸盐非晶材料(Er_xLa_1-xP₅O₁₄)动力学过程的速率方程,特别是引入了改进系数exp{hc _k/kT}以区别能量传递Stokes过程和反Stokes过程,分别对Er_0.01La_0.99P₅O₁₄,Er_0.1La关键词：反Stokes能量传递改进系数动力学过程五磷酸盐非晶红外量子剪裁

Influence of improved anti-Stokes energy transfer between rare earth ions in ErP5O14 noncrystal on dynamic study

Since the visible quantum cutting in Eu³⁺–Gd³⁺ material was reported, the importance, the application, and the significance of the quantum cutting phenomenon have been widely recognized.The rate equations which describe the luminescence dynamic processes for different concentrations of (Er_xLa_1-xP₅O₁₄) noncrystal are established in this paper. The coefficients exp{hc _k/kT} is introduced in to the calculation of anti-Stokes energy transfer rate to distinguish Stokes energy transfer.All dynamic processes have been simulated separately with and without considering this coefficient for the energy transfer rate of Er_0.01La_0.99P₅O₁₄,Er_0.1La_0.9P₅O₁₄ and ErP₅O₁₄ noncrystals when their ²H_11/2 ,⁴I_9/2 and⁴I_11/2 levels are excited.The results show that it is essential to take the coefficient into calculation particularly for ErP₅O₁₄ noncrystal where energy transfer plays a key role.There is no influence though the distance between rare earth ions is larger.And it is found that infrared quantum cutting exsists in ErP₅O₁₄ noncrystal excited by visible light. The relative nonradiative relaxation rate, the spontaneous emission rate and the energy transfer rate are calculated particularly , The relative energy transfer dynamics is analyzed.It is found that the {⁴H_11/2→⁴I_9/2,⁴I_15/2→⁴I_13/2} energy transfer with a rate of 239500s^-1, is the main reason for ²H_11/2 energy level to have the infrared quantum cutting, Which is meaningful for finding high-efficiency solar cell materials.