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Efficient Orange–Red Delayed Fluorescence Organic Light‐Emitting Diodes with External Quantum Efficiency over 26%
Advanced Electronic Materials ( IF 5.3 ) Pub Date : 2019-10-30 , DOI: 10.1002/aelm.201900843
Feng‐Ming Xie 1 , Ping Wu 1 , Shi‐Jie Zou 2 , Yan‐Qing Li 2 , Tao Cheng 2 , Miao Xie 2 , Jian‐Xin Tang 2 , Xin Zhao 1
Affiliation  

Highly efficient orange–red/red thermally activated delayed fluorescence (TADF) materials have been rarely reported due to the restriction of their molecular design in the energy gap law. An effective strategy is to use large rigid planar units and strong intramolecular charge transfer for synthesizing efficient long‐wavelength TADF materials. Three novel orange–red to red TADF materials are obtained using a large rigid planar dibenzo[a,c]phenazine (BP) acceptor core and different numbers of strong electron‐donating phenoxazine (PXZ) moieties, namely 1PXZ‐BP, 2PXZ‐BP, and 3PXZ‐BP. The increase in the number of PXZ units red‐shifts the emission from 602 to 682 nm in solution. Moreover, these emitters are endowed with high electroluminescence performance due to small singlet–triplet energy difference (ΔEST), fast radiative rate, and high photoluminescence quantum yields. 1PXZ‐BP‐based orange–red organic light‐emitting diodes (OLEDs) achieve an excellent external quantum efficiency of 26.3%, which is one of the highest efficiencies reported for orange–red TADF OLEDs.

中文翻译:

外部量子效率超过26%的高效橙红延迟荧光有机发光二极管

由于能隙定律限制了分子设计,因此很少报道高效橙红色/红色热激活延迟荧光(TADF)材料。一种有效的策略是使用大的刚性平面单元和强大的分子内电荷转移来合成有效的长波长TADF材料。使用较大的刚性平面二苯并[a,c]吩嗪(BP)受体核和不同数量的强电子给体吩恶嗪(PXZ)部分(即1PXZ-BP,2PXZ-BP)获得了三种新的橙红色至红色TADF材料和3PXZ-BP。PXZ单元数量的增加将溶液中的发射从602 nm转移到682 nm。此外,由于单重态-三重态的能量差(ΔE ST),快速的辐射速率和高的光致发光量子产率。基于1PXZ-BP的橙红色有机发光二极管(OLED)达到了26.3%的出色外部量子效率,这是橙红色TADF OLED报道的最高效率之一。
更新日期:2020-01-13
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