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Organic Radical Luminophores
- Chinese Journal of Luminescence Vol. 42, Issue 3, Pages: 379-391(2021)
- 作者机构：
1.湖南大学 化学化工学院， 生物与化学计量传感国家重点实验室， 湖南 长沙 410082
- 作者简介：
- 基金信息：National Natural Science Foundation of China(51922039);Shenzhen Science and Technology Program(RCJC20200714114434015)
DOI：10.37188/CJL.20210054
CLC：
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Zhi-biao ZHOU, Wei-ming LAI, Peng YANG, et al. Organic Radical Luminophores. [J]. Chinese Journal of Luminescence 42(3):379-391(2021)
Zhi-biao ZHOU, Wei-ming LAI, Peng YANG, et al. Organic Radical Luminophores. [J]. Chinese Journal of Luminescence 42(3):379-391(2021) DOI： 10.37188/CJL.20210054.
摘要
有机自由基由于存在未配对或弱成键电子，因而具有独特的基态开壳电子结构。这类开壳电子结构的分子体系可展示出特殊的物理性质，如近红外吸收、非线性光学响应、可逆电子氧化还原、磁学性质等，有望成为下一代光电磁信息功能材料。然而，绝大多数自由基在光激发态下以非辐射方式释放能量，从而表现为弱发光或不发光。近年来，以三芳基甲基自由基衍生物为代表的双线态自由基发光体逐渐引起研究者的关注，其红光发射的荧光量子产率可达到90%以上，且成功地应用于有机电致发光器件(OLED)。自由基发光体是在基态和激发态均具备自由基特征的新型分子体系，其分子结构设计与发光性质调控是该领域的关键难题。在已报道的仅有的少数发光自由基的基础上，人们更多地期待获得性能优异、可选择性调色的多种类发光自由基及其作为功能材料的潜在应用。本文总结了发光自由基的分子结构、物理性质和构效关系，以及激发态发光机制与自由基非辐射跃迁抑制机理等，讨论了目前的研究现状和未来的研究挑战。
Abstract
Organic radicals have unique ground state open-shell electronic structures, arising from the presence of unpaired or weakly bonded electrons. Such molecular systems generally exhibit special physical properties, such as near-infrared absorption, nonlinear optical response, reversible redox, magnetic properties and ,etc,., and may become the next generation of optoelectronic and magnetic materials. However, among organic radicals, the majority of them have strong non-radiative channels to release photoexcited energy, and thus display extremely weak or no luminescence. In recent years, doublet radicals, exemplified by derivatives of triarylmethyl radical, show attractive luminescent property, and their red emission with fluorescence quantum yield even up to 90% are impressive, and they are promising material candidates for application in organic light-emitting diodes(OLEDs). Radical luminophore is defined as a new type of luminescent chromophore with open-shell character at both the ground state and excited state. The difficulties in radical luminohpore are how to design new radicals and to tune their luminescent properties. Importantly, more radical luminophores with selectivity of color displays and high luminescence efficiencies are highly desirable in this research area. For this, we give a short review of the radical luminophores relative to molecular structures, physical properties and the relationship between structure and property, together with furthermore discussion of excited-state luminescence mechanism and suppression of non-radiative transition, as well as expects and challenges in future.
关键词
自由基发光体构效关系激发态调控发光效率聚集态
Keywords
radical luminophorestructure-property relationshipmodulation of excited-stateluminescence efficiencyaggregation state
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