Efficient light-emitting diodes from organic radicals with doublet emission
Efficient light-emitting diodes from organic radicals with doublet emission
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DOI：
10.1063/5.0047636
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发表时间：
2021-05-14
影响因子：
3.2
通讯作者：
Evans, Emrys W.
中科院分区：
文献类型：
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作者：
Hudson, John M.;Hele, Timothy J. H.;Evans, Emrys W.
具有双态自旋自由基发射体的有机发光二极管（OLED）已成为高效显示技术的新途径。与标准有机半导体相比，自由基材料具有不成对的电子。这一特征导致有机自由基最著名的例子是它们在化学反应中是活性物质。稳定的自由基可用于光电应用，利用其光学和自旋特性，实现高达 100% 的电致发光内量子效率 (IQE)。高效 OLED 已被证明，其在具有双态发射的双态自旋电子态流形中工作。基于自由基的器件与单线态和三线态考虑因素不同，这些考虑因素对典型有机半导体的 OLED 施加了效率限制（25% IQE）。本视角重点关注光电子学中的自由基双峰发射体，概述了不成对电子系统的光物理学和自旋物理学如何为发光应用的研究提供新途径。
Organic light-emitting diodes (OLEDs) with doublet-spin radical emitters have emerged as a new route to efficient display technologies. In contrast to standard organic semiconductors, radical materials have unpaired electrons. This feature results in the most well-known examples of organic radicals being where they are reactive species in chemical reactions. Stabilized radicals can be used in optoelectronic applications, which exploit their optical and spin properties, allowing up to 100% internal quantum efficiency (IQE) for electroluminescence. Highly efficient OLEDs have been demonstrated, which operate in the doublet-spin electronic state manifold with doublet emission. The radical-based devices present a departure from the singlet- and triplet-level considerations that impose efficiency limits in OLEDs for typical organic semiconductors (25% IQE). This Perspective focuses on radical doublet emitters for optoelectronics, outlining how the photo- and spin-physics of unpaired electron systems present new avenues for research in light-emitting applications.