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首页> 外文期刊>Advanced Materials >Identification of the Key Parameters for Horizontal Transition Dipole Orientation in Fluorescent and TADF Organic Light-Emitting Diodes
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Identification of the Key Parameters for Horizontal Transition Dipole Orientation in Fluorescent and TADF Organic Light-Emitting Diodes

机译：荧光和TADF有机发光二极管水平过渡偶极偏向的关键参数识别

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摘要

In organic light-emitting diodes (OLEDs), horizontal orientation of the emissive transition dipole moment (TDM) can improve light outcoupling efficiency by up to 50% relative to random orientation. Therefore, there have been extensive efforts to identify drivers of horizontal orientation. The aspect ratio of the emitter molecule and the glass-transition temperature (T-g) of the films are currently regarded as particularly important. However, there remains a paucity of systematic studies that establish the extent to which these and other parameters control orientation in the wide range of emitter systems relevant for state-of-the-art OLEDs. Here, recent work on molecular orientation of fluorescent and thermally activated delayed fluorescent emitters in vacuum-processed OLEDs is reviewed. Additionally, to identify parameters linked to TDM orientation, a meta-analysis of 203 published emitter systems is conducted and combined with density-functional theory calculations. Molecular weight (MW) and linearity are identified as key parameters in neat systems. In host-guest systems with low-MW emitters, orientation is mostly influenced by the host T-g, whereas the length and MW of the emitter become more relevant for systems involving higher-MW emitters. To close, a perspective of where the field must advance to establish a comprehensive model of molecular orientation is given.
机译：在有机发光二极管（OLED）中，发光过渡偶极矩（TDM）的水平取向可以通过随机取向通过高达50％的光输出耦合效率提高。因此，已经广泛努力识别水平方向的驱动因素。发射极分子的纵横比和膜的玻璃化转变温度（T-G）目前被认为特别重要。然而，仍然存在对系统研究的缺乏，确定这些和其他参数控制在与最先进的OLED相关的发射器系统中的各种参数控制方向。这里，综述了荧光和热活化的延迟荧光发射器的最新工作，在真空处理的OLED中进行了分子取向。另外，为了识别链接到TDM方向的参数，对203发布的发射器系统进行了元分析，并与密度功能理论计算结合。分子量（MW）和线性度被鉴定为整齐系统中的关键参数。在具有低MW发射器的主机设备中，方向主要受主机T-G的影响，而发射器的长度和MW对涉及更高MW发射器的系统变得更加相关。为了关闭，给出了该领域必须前进以建立分子取向综合模型的透视。

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  • 来源
    《Advanced Materials》 |2021年第37期|2100677.1-2100677.28|共28页
  • 作者

    Tenopala-Carmona Francisco; Lee Oliver S.; Crovini Ettore; Neferu Ana M.; Murawski Caroline; Olivier Yoann; Zysman-Colman Eli; Gather Malte C.;

  • 作者单位

    Univ St Andrews SUPA Sch Phys & Astron Organ Semicond Ctr St Andrews KY16 9SS Fife Scotland|Univ Cologne Dept Chem Humboldt Ctr Nano & Biophoton Greinstr 4-6 D-50939 Cologne Germany;

    Univ St Andrews SUPA Sch Phys & Astron Organ Semicond Ctr St Andrews KY16 9SS Fife Scotland|Univ St Andrews EaStCHEM Sch Chem Organ Semicond Ctr St Andrews KY16 9ST Fife Scotland;

    Univ St Andrews EaStCHEM Sch Chem Organ Semicond Ctr St Andrews KY16 9ST Fife Scotland;

    Univ St Andrews SUPA Sch Phys & Astron Organ Semicond Ctr St Andrews KY16 9SS Fife Scotland|Univ St Andrews EaStCHEM Sch Chem Organ Semicond Ctr St Andrews KY16 9ST Fife Scotland;

    Univ St Andrews SUPA Sch Phys & Astron Organ Semicond Ctr St Andrews KY16 9SS Fife Scotland|Kurt Schwabe Inst Mess & Sensortech Meinsberg eV Kurt Schwabe Str 4 D-04736 Waldheim Germany;

    Univ Namur Namur Inst Struct Matter Unite Chim Phys Theor & Struct Rue Bruxelles 61 B-5000 Namur Belgium|Univ Namur Namur Inst Struct Matter Lab Phys Solide Rue Bruxelles 61 B-5000 Namur Belgium;

    Univ St Andrews EaStCHEM Sch Chem Organ Semicond Ctr St Andrews KY16 9ST Fife Scotland;

    Univ St Andrews SUPA Sch Phys & Astron Organ Semicond Ctr St Andrews KY16 9SS Fife Scotland|Univ Cologne Dept Chem Humboldt Ctr Nano & Biophoton Greinstr 4-6 D-50939 Cologne Germany;

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  • 正文语种 eng
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  • 关键词

    meta-analysis; molecular orientation; multiple linear regression; organic light-emitting diodes; thermally activated delayed fluorescence;

    机译：Meta分析;分子取向;多元线性回归;有机发光二极管;热活化的延迟荧光;

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