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Pyrene–Oxadiazoles for Organic Light-Emitting Diodes: Triplet to Singlet Energy Transfer and Role of Hole-Injection/Hole-Blocking Materials
The Journal of Organic Chemistry ( IF 3.3 ) Pub Date : 2015-12-24 00:00:00 , DOI: 10.1021/acs.joc.5b02423 Swetha Chidirala 1 , Hidayath Ulla 2 , Anusha Valaboju 3 , M. Raveendra Kiran 2 , Maneesha Esther Mohanty 1 , M. N. Satyanarayan 2 , G. Umesh 2 , Kotamarthi Bhanuprakash 3 , Vaidya Jayathirtha Rao 1, 4
The Journal of Organic Chemistry ( IF 3.3 ) Pub Date : 2015-12-24 00:00:00 , DOI: 10.1021/acs.joc.5b02423 Swetha Chidirala 1 , Hidayath Ulla 2 , Anusha Valaboju 3 , M. Raveendra Kiran 2 , Maneesha Esther Mohanty 1 , M. N. Satyanarayan 2 , G. Umesh 2 , Kotamarthi Bhanuprakash 3 , Vaidya Jayathirtha Rao 1, 4
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Three pyrene–oxadiazole derivatives were synthesized and characterized by optical, electrochemical, thermal, and theoretical investigations to obtain efficient multifunctional organic light emitting diode (OLED) materials. Synthesized molecules were used as emitters and electron transporters in three different device configurations, involving hole-injection/hole-blocking materials that showed good current and power efficiencies. To understand the underlying mechanisms involved in the application of these molecules as emitters and transporters, a detailed photophysical characterization of molecules 4–6 was carried out. The absorption, steady-state fluorescence, phosphorescence, fluorescence lifetime, and phosphorescence lifetime measurements were carried out. The high quantum yield and efficient reverse intersystem crossing leading to delayed fluorescence emission makes the molecule a good emitter, and the charge delocalization properties leading to excimer formation make them efficient electron transporters. Isoenergetic singlet and triplet states of the molecules make the reverse intersystem crossing feasible at room temperature even in the absence of thermal activation.
中文翻译：
Organic-恶二唑用于有机发光二极管：三重态到单重态能量转移和空穴注入/空穴阻挡材料的作用
合成了三种pyr-恶二唑衍生物，并通过光学，电化学，热学和理论研究对其进行了表征，从而获得了高效的多功能有机发光二极管（OLED）材料。合成的分子在三种不同的器件配置中用作发射器和电子传输器，涉及显示出良好电流和功率效率的空穴注入/空穴阻挡材料。为了了解这些分子作为发射体和转运体的应用所涉及的潜在机理，详细介绍了分子4 – 6的光物理特性进行了。进行吸收，稳态荧光，磷光，荧光寿命和磷光寿命的测量。高量子产率和有效的反向系统间交叉导致延迟的荧光发射，使该分子成为良好的发射体，而导致准分子形成的电荷离域性质使其成为有效的电子转运体。即使在没有热激活的情况下，分子的等能量单重态和三重态也使得反向的系统间穿越成为可能。
更新日期：2015-12-24
中文翻译：
Organic-恶二唑用于有机发光二极管：三重态到单重态能量转移和空穴注入/空穴阻挡材料的作用
合成了三种pyr-恶二唑衍生物，并通过光学，电化学，热学和理论研究对其进行了表征，从而获得了高效的多功能有机发光二极管（OLED）材料。合成的分子在三种不同的器件配置中用作发射器和电子传输器，涉及显示出良好电流和功率效率的空穴注入/空穴阻挡材料。为了了解这些分子作为发射体和转运体的应用所涉及的潜在机理，详细介绍了分子4 – 6的光物理特性进行了。进行吸收，稳态荧光，磷光，荧光寿命和磷光寿命的测量。高量子产率和有效的反向系统间交叉导致延迟的荧光发射，使该分子成为良好的发射体，而导致准分子形成的电荷离域性质使其成为有效的电子转运体。即使在没有热激活的情况下，分子的等能量单重态和三重态也使得反向的系统间穿越成为可能。
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