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Metal-Perturbed Multiresonance TADF Emitter Enables High-Efficiency and Ultralow Efficiency Roll-Off Nonsensitized OLEDs with Pure Green Gamut
Advanced Materials ( IF 27.4 ) Pub Date : 2022-11-21 , DOI: 10.1002/adma.202208378 Junjie Wang 1 , Nengquan Li 1 , Cheng Zhong 2 , Jingsheng Miao 1 , Zhongyan Huang 1 , Mingxin Yu 1 , Yu Xuan Hu 1 , Sai Luo 1 , Yang Zou 1 , Kai Li 1 , Chuluo Yang 1
Advanced Materials ( IF 27.4 ) Pub Date : 2022-11-21 , DOI: 10.1002/adma.202208378 Junjie Wang 1 , Nengquan Li 1 , Cheng Zhong 2 , Jingsheng Miao 1 , Zhongyan Huang 1 , Mingxin Yu 1 , Yu Xuan Hu 1 , Sai Luo 1 , Yang Zou 1 , Kai Li 1 , Chuluo Yang 1
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Multiresonance (MR)-induced thermally activated delayed fluorescence (TADF) emitters based on B- and N-embedded polycyclic aromatics are desirable for ultrahigh-definition organic light-emitting diodes (OLEDs) due to their high photoluminescence quantum yield (PLQY) and narrow bandwidth. But the reverse intersystem crossing (RISC) rates of MR-TADF emitters are usually small, resulting in severe device efficiency roll-off at high brightness. To solve this issue, a sensitizer for the MR-TADF emitter has been required. Herein, a new MR-TADF emitter is developed through coordination of Au with B/N-embedded polycyclic ligand. Benefitting from the Au perturbation, the RISC rate is dramatically accelerated to 2.3 × 107 s−1, leading to delayed fluorescence lifetime as short as 4.3 µs. Meanwhile, the PLQY of 95% and full width at half maximum of 39 nm (0.18 eV) are essentially unchanged after metal coordination. Therefore, a high PLQY, short delayed fluorescence lifetime, and high color purity are concurrently realized in a single TADF emitter. Accordingly, vacuum-deposited OLEDs exhibit high-performance electroluminescence with a maximum external quantum efficiency (EQE) of 35.8% without sensitization. The EQE is maintained as high as 32.3% at 10 000 cd m−2. Furthermore, solution-processed OLED based on the emitter also achieves excellent performance with a maximum EQE of 25.7% and a small efficiency roll-off.
中文翻译：
金属扰动多谐振 TADF 发射器可实现具有纯绿色色域的高效率和超低效率滚降非敏化 OLED
基于 B 和 N 嵌入多环芳烃的多共振 (MR) 诱导热激活延迟荧光 (TADF) 发射器因其光致发光量子产率 (PLQY) 高和窄窄而成为超高清有机发光二极管 (OLED) 的理想选择带宽。但是 MR-TADF 发射器的反向系统间交叉 (RISC) 率通常很小，导致在高亮度下器件效率严重下降。为了解决这个问题，需要一种用于 MR-TADF 发射器的敏化剂。在此，通过 Au 与 B/N 嵌入的多环配体的配位开发了一种新的 MR-TADF 发射器。受益于 Au 扰动，RISC 速率显着加速至 2.3 × 10 7 s -1，导致延迟荧光寿命短至 4.3 µs。同时，95%的PLQY和39 nm（0.18 eV）的半峰全宽在金属配位后基本没有变化。因此，在单个 TADF 发射器中同时实现了高 PLQY、短延迟荧光寿命和高色纯度。因此，真空沉积 OLED 表现出高性能电致发光，最大外量子效率 (EQE) 为 35.8%，无需敏化。EQE 在 10 000 cd m -2时保持高达 32.3% 。此外，基于发射器的溶液处理 OLED 还实现了出色的性能，最大 EQE 为 25.7%，效率下降较小。
更新日期：2022-11-21
中文翻译：
金属扰动多谐振 TADF 发射器可实现具有纯绿色色域的高效率和超低效率滚降非敏化 OLED
基于 B 和 N 嵌入多环芳烃的多共振 (MR) 诱导热激活延迟荧光 (TADF) 发射器因其光致发光量子产率 (PLQY) 高和窄窄而成为超高清有机发光二极管 (OLED) 的理想选择带宽。但是 MR-TADF 发射器的反向系统间交叉 (RISC) 率通常很小，导致在高亮度下器件效率严重下降。为了解决这个问题，需要一种用于 MR-TADF 发射器的敏化剂。在此，通过 Au 与 B/N 嵌入的多环配体的配位开发了一种新的 MR-TADF 发射器。受益于 Au 扰动，RISC 速率显着加速至 2.3 × 10 7 s -1，导致延迟荧光寿命短至 4.3 µs。同时，95%的PLQY和39 nm（0.18 eV）的半峰全宽在金属配位后基本没有变化。因此，在单个 TADF 发射器中同时实现了高 PLQY、短延迟荧光寿命和高色纯度。因此，真空沉积 OLED 表现出高性能电致发光，最大外量子效率 (EQE) 为 35.8%，无需敏化。EQE 在 10 000 cd m -2时保持高达 32.3% 。此外，基于发射器的溶液处理 OLED 还实现了出色的性能，最大 EQE 为 25.7%，效率下降较小。
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