摘要
采用耦合的微分方程组对具有激子裂变特性的红荧烯材料的瞬态发光衰减过程进行理论拟合.其中一组微分方程组来源于传统的两步三状态演化模型,另一组则来源于新确立的三步四状态演化模型.通过方程组的迭代运算可以反映材料中单重态激子裂变过程的动态变化.拟合结果显示,四状态模型对激子裂变过程的描述较之三状态模型更加合理,拟合曲线与实验曲线符合度更好.另外,对曲线拟合所用的速率参数随温度的变化进行了指数拟合,进而得到红荧烯材料激子裂变过程的能量差值.拟合结果同样显示,相较于三状态模型,四状态模型拟合得到的能量差更接近准确值.
The coupled differential equations have been utilized to fit the transient fluorescence decay from rubrene material,which had the property of singlet exciton fission.One set of coupled differential equations was derived from a traditional two-step/three-state evolution model.Another set of coupled differential equations was derived from a newly established three-step/four-state evolution model.The dynamic change of singlet exciton fission process could be depicted by the iterative operations of the above two set of equations.The simulated results show that four-state model was more reasonable than three-state model for the description of singlet exciton fission.The simulating curves were more coincide with experimental curves.In addition,we adopted the exponential laws to fit the variation of rate constants at different temperatures.Furthermore,the energy difference of fission process in rubrene could be obtained.Similarly,the simulating results showed that the value of energy difference obtained by using four-state model was more accurate than that from three-state model.
作者
刘玲
曾俊杰
张勇
LIU Ling;ZENG Junjie;ZHANG Yong(School of Physical Science and Technology,Southwest University/Chongqing Key Laboratory of Micro and Nano Structure Optoelectronics,Chongqing 400715,China)
出处
《西南师范大学学报（自然科学版）》
CAS
2022年第10期1-6,共6页
Journal of Southwest China Normal University(Natural Science Edition)
基金
国家自然科学基金资助项目(61475126)。
关键词
单重态激子裂变
瞬态发光衰减
红荧烯
演化模型
singlet exciton fission
transient fluorescence decay
rubrene
evolution model
