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Diverse emission properties of transition metal complexes beyond exclusive single phosphorescence and their wide applications

机译：过渡金属配合物的不同排放性能超出独占单磷光荧光及其广泛应用

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摘要

Luminescence properties and excited state reactivities of photoactive transition metal complexes have been harnessed for various applications in the fields of electroluminescent devices, luminescent sensing and bio-imaging, and solar energy conversion as well as photo-redox catalysis in organic transformation. While, beyond the conventional phosphorescence from triplet excited sates that are populated through heavy metal atom induced intersystem crossing (ISC), the past decade has witnessed blooming reports on intriguing luminescence behaviors such as sole fluorescence, dual fluorescence/phosphorescence, thermally activated delayed fluorescence (TADF), and dual phosphorescence. All these findings reveal that the possible photophysical mechanisms of transition metal complexes remain relatively underexplored. On one hand, the intersystem crossing (ISC) rate that is crucial to the depopulation of the singlet excited state and thus the population efficiency of the triplet excited state has proven to be not simply dependent on the spin-orbit coupling constant of the metal atom. On the other hand, the decay paths for triplet excited state(s) through reverse ISC (T1 - S1) and direct radiation from higher triplet excited state have been opened by appropriate ligand design. Moreover, these novel emission properties of transition metal complexes have expanded their applications into the fields of ratiometric sensing/imaging, noble-metal-free high efficiency emitters and photocatalysts and beyond. This review is aimed to discuss the unconventional emission properties and applications of transition metal complexes that were reported mainly in the past decade by focusing on the structural factors that are at play in realizing the novel excited state properties. It is conceived to provide a better understanding of the excited state properties tuning and to direct the design of new emissive metal complexes with tailored functions. (C) 2020 Elsevier B.V. All rights reserved.
机译：已经利用了光活性过渡金属配合物的发光性质和激发状态反应，用于电致发光器件，发光感测和生物成像以及太阳能转换以及有机转化中的太阳能转换以及太阳能转换以及光氧化还原催化的各种应用。虽然超出了通过重金属原子诱导的流星系统交叉（ISC）填充的三联兴奋性的常规磷光，但过去十年目睹了诸如唯一荧光，双荧光/磷光，热活化的延迟荧光等诱人发光行为（ TADF）和双磷光。所有这些发现表明过渡金属配合物的可能的光物理机制仍然相对望远欠。一方面，对于单态激发态的分布至关重要的基于间接交叉（ISC）速率，从而证明了三重态激发态的人口效率并不简单地依赖于金属原子的旋转轨道耦合常数。另一方面，通过相应的配体设计打开通过反向ISC（T1-＆GT; S1）和来自高级激发态的直接辐射的Tri态激发态的衰减路径。此外，这些过渡金属配合物的这些新的排放性能使其应用扩展到比率感测/成像，无贵金属的高效率发射器和光催化剂及其超出领域。本综述旨在讨论主要在过去十年中报告的过渡金属配合物的非传统排放性能和应用，通过关注实现新颖的激发状态性质的结构因素。构思是为了更好地了解激发的状态性质调谐，并通过定制功能指导新的发光金属配合物的设计。 （c）2020 Elsevier B.V.保留所有权利。

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  • 来源
    《Coordination chemistry reviews》 |2021年第4期|213755.1-213755.15|共15页
  • 作者

    Li Kai; Chen Yong; Wang Jian; Yang Chuluo;

  • 作者单位

    Shenzhen Univ Coll Mat Sci & Engn Shenzhen 518055 Peoples R China;

    Chinese Acad Sci Tech Inst Phys & Chem Key Lab Photochem Convers & Optoelect Mat Beijing 100190 Peoples R China|Chinese Acad Sci Tech Inst Phys & Chem CAS HKU Joint Lab New Mat Beijing 100190 Peoples R China;

    Jilin Univ Coll Chem Inst Theoret Chem Changchun 130023 Peoples R China;

    Shenzhen Univ Coll Mat Sci & Engn Shenzhen 518055 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Excited state; Transition metal complexes; Luminescence; Intersystem crossing; Earth abundant metal;

    机译：兴奋状态;过渡金属配合物;发光;界面交叉;地球丰富的金属;

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