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Multiple-Resonance-Type TADF Emitter as Sensitizer Improving the Performance of Blue Fluorescent Organic Light-Emitting Diodes
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2022-10-31 , DOI: 10.1002/adom.202202034
Yaxiong Wang 1 , Runda Guo 1 , Ao Ying 2 , Kaiyuan Di 1 , Linya Chen 3 , Honggang Gu 4 , Shiyuan Liu 4 , Yalei Duan 1 , Hanrui Su 1 , Shaolong Gong 2 , Lei Wang 1
Affiliation  

Due to the limitation of donor and acceptor group selection, the efficient thermally activated delayed fluorescence (TADF) type sensitizer used for blue organic light-emitting diodes (OLEDs) is rare. Multiple resonance (MR) type TADF emitters can easily achieve efficient blue emission. And the compounds exhibit small Stokes shift and lower absorption energy under the same emission color compared with traditional TADF, mitigating the damage of high-energy absorption of sensitizer on material stability. However, their characteristics as sensitizers have not been explored. In this work, a deep-blue MR-TADF compound (3tPAB) is selected as a sensitizer for both blue traditional fluorescence and MR-TADF OLED. Given the improved photoluminescence quantum yield and the utilization of triplet excitons, the TADF-sensitized fluorescent device using 3tPAB as sensitizer presents a maximum external quantum efficiency (EQEmax) of 14.4%, showing ≈2.4 times increase compared with the device without sensitizer. More impressively, TADF-sensitized TADF (TST) device using 3tPAB as sensitizer and MR-TADF compound PhDMAC-BN as emitter exhibits EQEmax of 33.9%. And in TST device, efficient Förster energy transfer is demonstrated, thus, the device can maintain high color purity. The work first demonstrates the feasibility of MR-TADF as a sensitizer and provides a new strategy for developing high-performance blue OLED with high color purity.

中文翻译:

多谐振型TADF发射体作为敏化剂提高蓝色荧光有机发光二极管的性能

由于供体和受体基团选择的限制,用于蓝色有机发光二极管(OLED)的高效热激活延迟荧光(TADF)型敏化剂很少见。多共振 (MR) 型 TADF 发射器可以轻松实现高效的蓝光发射。并且与传统的TADF相比,该化合物在相同发射颜色下表现出较小的斯托克斯位移和较低的吸收能量,减轻了敏化剂的高能量吸收对材料稳定性的损害。然而,尚未探索它们作为敏化剂的特性。在这项工作中,选择深蓝色 MR-TADF 化合物 (3tPAB) 作为蓝色传统荧光和 MR-TADF OLED 的敏化剂。鉴于改进的光致发光量子产率和三线态激子的利用,max ) 为 14.4%,与没有敏化剂的设备相比增加了 ≈2.4 倍。更令人印象深刻的是,使用 3tPAB 作为敏化剂和 MR-TADF 化合物 PhDMAC-BN 作为发射体的 TADF 敏化 TADF (TST) 器件的 EQE最大值为 33.9%。而在 TST 器件中,展示了高效的 Förster 能量转移,因此,该器件可以保持高色纯度。该工作首次论证了MR-TADF作为敏化剂的可行性,为开发具有高色纯度的高性能蓝色OLED提供了新策略。
更新日期:2022-10-31
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