高等学校化学学报 ›› 2021, Vol. 42 ›› Issue (7): 2245.doi: 10.7503/cjcu20210175

• 研究论文 • 上一篇    下一篇

四配位铂磷光发射体结构与光物理性质关系的理论研究

王建,张红星   

  1. 吉林大学理论化学研究所, 长春 130021
  • 收稿日期:2021-03-15 出版日期:2021-07-10 发布日期:2021-04-29
  • 作者简介:王 建, 男, 博士, 副教授, 主要从事激发态电子结构计算研究. E-mail: abbott@jlu.edu.cn
  • 基金资助:
    国家自然科学基金(21873038)

Theoretical Study on the Structural-photophysical Relationships of Tetra-Pt Phosphorescent Emitters

WANG Jian(), ZHANG Hongxing()   

  1. Institute of Theoretical Chemistry,Jilin University,Changchun 130021,China
  • Received:2021-03-15 Online:2021-07-10 Published:2021-04-29
  • Contact: ZHANG Hongxing E-mail:abbott@jlu.edu.cn;zhanghx@jlu.edu.cn
  • Supported by:
    This paper is supported by the Natural Science Foundation of China(21873038)

摘要:

定量理解光物理过程对于开发新型高效发射极至关重要. 优化提升二价铂配合物磷光量子效率是提升基于金属铂有机发光二极管发光效率的关键. 本文借助密度泛函理论计算, 探讨了一类平面四齿配位二价铂配合物磷光辐射的微观机制, 包括自旋轨道耦合积分、 辐射寿命、 速率常数、 跃迁偶极矩和隙间蹿跃通道. 综合研究发现, 沿着N→Pt方向推电子, 可有效屏蔽非辐射跃迁过程, 从而提升磷光发射效率. 本文将为高效发射器的分子工程学设计提供必要的指导.

关键词: 密度泛函理论, 旋轨耦合, 辐射速率, 隙间蹿跃

Abstract:

Quantitative comprehension of the photophysical process is essential for developing novel highly efficient emitters. Improving the photoluminescence quantum efficiency of Pt(Ⅱ) complexes is the key to their application as emitters in organic light-emitting diodes(OLEDs). With the help of density functional theory(DFT) calculation, the current contribution addresses the microscopic mechanisms of phosphorescence for Pt(Ⅱ) complexes including calculations of the spin-orbit couplings integrals, radiative lifetime, rate constants, transition dipole moments, and intersystem crossing(ISC) channels. We found that pushing electrons in N→Pt direction can effectively shield the non-radiative decay process, thereby improving the phosphorescence emission efficiency. This work would provide useful insight into the molecular engineering for high- efficient emitters.

Key words: Density functional theory, Spin-orbit coupling, Radiative decay rate constant, Intersystem crossing

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