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Thermally Activated Delayed Photoluminescence: Deterministic Control of Excited State Decay
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2020-06-04 , DOI: 10.1021/jacs.0c03331
Daniel T Yonemoto 1 , Christopher M Papa 1 , Cedric Mongin 2 , Felix N Castellano 1
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2020-06-04 , DOI: 10.1021/jacs.0c03331
Daniel T Yonemoto 1 , Christopher M Papa 1 , Cedric Mongin 2 , Felix N Castellano 1
Affiliation
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Thermally activated photophysical processes are ubiquitous in numerous organic and metal-organic molecules, leading to chromophores with excited state properties that can be considered an equilibrium mixture of the available low-lying states. Relative populations of the equilibrated states are governed by temperature. Such molecules have been devised as high quantum yield emitters in modern organic light-emitting diode technology and for deterministic excited state lifetime control to enhance chemical reactivity in solar energy conversion and photocatalytic schemes. The recent discovery of thermally activated photophysics at CdSe nanocrystal-molecule interfaces enables a new paradigm wherein molecule-quantum dot constructs are used to systematically generate material with predetermined photophysical response and excited state properties. Semiconductor nanomaterials feature size-tunable energy level engineering, which considerably expands the purview of thermally activated photophysics beyond what is possible using only molecules. This Perspective is intended to provide a non-exhaustive overview of the advances that led to the integration of semiconductor quantum dots in thermally activated delayed photoluminescence (TADPL) schemes and to identify important challenges moving into the future. The initial establishment of excited state lifetime extension utilizing triplet-triplet excited-state equilibria is detailed. Next, advances involving the rational design of molecules composed of both metal-containing and organic-based chromophores that produce the desired TADPL are described. Finally, the recent introduction of semiconductor nanomaterials into hybrid TADPL constructs is discussed, paving the way towards the realization of fine-tuned deterministic excited state lifetime control. It is envisioned that libraries of synthetically facile composites will be broadly deployed as photosensitizers and light emitters for numerous synthetic and optoelectronic applications in the near future.
中文翻译：
热激活延迟光致发光：激发态衰减的确定性控制
热激活的光物理过程在众多有机和金属有机分子中无处不在，导致具有激发态特性的发色团可以被认为是可用低位态的平衡混合物。平衡状态的相对种群受温度控制。此类分子已被设计为现代有机发光二极管技术中的高量子产率发射体，并用于确定性激发态寿命控制，以增强太阳能转换和光催化方案中的化学反应性。最近在 CdSe 纳米晶体 - 分子界面上发现的热激活光物理学提供了一种新的范例，其中分子 - 量子点构造用于系统地生成具有预定光物理响应和激发态特性的材料。半导体纳米材料具有尺寸可调的能级工程，这大大扩展了热激活光物理学的范围，超出了仅使用分子的可能范围。本视角旨在对导致半导体量子点集成到热激活延迟光致发光 (TADPL) 方案中的进展进行非详尽概述，并确定未来面临的重要挑战。详细介绍了利用三重态-三重态激发态平衡的激发态寿命延长的初始建立。接下来，描述了涉及由含金属和有机基发色团组成的分子的合理设计的进展，这些发色团产生所需的 TADPL。最后，讨论了最近将半导体纳米材料引入混合 TADPL 结构，为实现微调确定性激发态寿命控制铺平了道路。可以预见，在不久的将来，易于合成的复合材料库将被广泛用作光敏剂和光发射器，用于众多合成和光电应用。
更新日期：2020-06-04
中文翻译：
热激活延迟光致发光：激发态衰减的确定性控制
热激活的光物理过程在众多有机和金属有机分子中无处不在，导致具有激发态特性的发色团可以被认为是可用低位态的平衡混合物。平衡状态的相对种群受温度控制。此类分子已被设计为现代有机发光二极管技术中的高量子产率发射体，并用于确定性激发态寿命控制，以增强太阳能转换和光催化方案中的化学反应性。最近在 CdSe 纳米晶体 - 分子界面上发现的热激活光物理学提供了一种新的范例，其中分子 - 量子点构造用于系统地生成具有预定光物理响应和激发态特性的材料。半导体纳米材料具有尺寸可调的能级工程，这大大扩展了热激活光物理学的范围，超出了仅使用分子的可能范围。本视角旨在对导致半导体量子点集成到热激活延迟光致发光 (TADPL) 方案中的进展进行非详尽概述，并确定未来面临的重要挑战。详细介绍了利用三重态-三重态激发态平衡的激发态寿命延长的初始建立。接下来，描述了涉及由含金属和有机基发色团组成的分子的合理设计的进展，这些发色团产生所需的 TADPL。最后，讨论了最近将半导体纳米材料引入混合 TADPL 结构，为实现微调确定性激发态寿命控制铺平了道路。可以预见，在不久的将来，易于合成的复合材料库将被广泛用作光敏剂和光发射器，用于众多合成和光电应用。
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