Marching Toward Highly Efficient, Pure‐Blue, and Stable Thermally Activated Delayed Fluorescent Organic Light‐Emitting Diodes,Advanced Functional Materials

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Marching Toward Highly Efficient, Pure‐Blue, and Stable Thermally Activated Delayed Fluorescent Organic Light‐Emitting Diodes
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-09-12 , DOI: 10.1002/adfm.201802558
Xinyi Cai ₁ , Shi-Jian Su ₁

Affiliation

The vast market demands for applications of organic light‐emitting diodes (OLEDs) have quickened the pace of the search for future high‐performance materials, emphasizing the importance of exploring blue light‐emitting materials, which determine the performance bottleneck of OLEDs. Moreover, actualizing highly efficient, pure‐blue, stable, and purely organic electroluminescence will pave the way toward the realization of cost‐effective, high‐quality, and long‐lasting commercialized OLED displays and illumination applications. Without the aid of noble heavy metal atoms, the newly emerging thermally activated delayed fluorescent (TADF) materials can effectively utilize triplet excitons owing to the small singlet–triplet splitting energy (ΔE_ST) for rapid reverse intersystem crossing (RISC) process, leading to the achievement of 100% internal quantum efficiency under electrical operation. Nevertheless, fundamental scientific challenges with respect to simultaneously achieving stable pure‐blue emission, large radiative recombination rates with short exciton lifetimes and small ΔE_ST continue to hinder the popularization of blue TADF materials. A review of the current state of blue TADF emitters is timely and underscores the key challenges that must be overcome toward the development of a stable, true‐blue TADF‐based electroluminescent application in the future.

中文翻译：

向着高效，纯蓝色，稳定的热激活延迟荧光有机发光二极管迈进。

市场对有机发光二极管（OLED）应用的巨大需求，加快了寻找未来高性能材料的步伐，强调了探索决定OLED性能瓶颈的蓝色发光材料的重要性。此外，实现高效，纯蓝色，稳定和纯有机电致发光将为实现具有成本效益，高质量和持久的商业化OLED显示器和照明应用铺平道路。在没有贵重金属原子的帮助下，由于单重态-三重态分裂能小（ΔE _ST），新出现的热活化延迟荧光（TADF）材料可以有效地利用三重态激子。），以实现快速反向系统间穿越（RISC）过程，从而在电气操作下实现100％的内部量子效率。然而，在同时实现稳定的纯蓝色发射，激子寿命短，ΔE_ST小的大辐射复合率方面，根本的科学挑战继续阻碍着蓝色TADF材料的普及。回顾蓝色TADF发光体的当前状态是及时的，强调了未来开发稳定的，真正的基于TADF的纯蓝色电致发光应用必须克服的关键挑战。

更新日期：2018-09-12

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