Highly efficient hybridized local and Charge-transfer (HLCT) Deep-blue electroluminescence with excellent molecular horizontal orientation
Highly efficient hybridized local and Charge-transfer (HLCT) Deep-blue electroluminescence with excellent molecular horizontal orientation
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高效的局部杂化和电荷转移 (HLCT) 深蓝色电致发光，具有优异的分子水平取向
DOI：
10.1016/j.cej.2022.135911
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发表时间：
2022
影响因子：
15.1
通讯作者：
Yuguang Ma
中科院分区：
文献类型：
--
作者：
Shengbing Xiao;Ying Gao;Runze Wang;Haichao Liu;Weijun Li;Changjiang Zhou;Shanfeng Xue;Shi-Tong Zhang;Bing Yang;Yuguang Ma
具有良好色纯度的高效深蓝色发光体是有机发光二极管（OLED）应用的基础。本文报道了两种菲并咪唑（PPI）衍生物的深蓝色发光体（DP，SP），它们具有高的光致发光量子产率（PLQY）和良好的色纯度的混合局域和电荷转移（HLCT）特性。更重要的是，它们的水平偶极子取向（Θ//）均上级各向同性发射体（66.7%），特别是SP的Θ//为89.5%，这可以大大提高其OLED性能。结果表明，非掺杂SP的有机电致发光器件具有较好的深蓝色发光性能，其CIE坐标为（0.158，0.068），最大外量子效率（EQEmax）为11.3%，是DP的近2倍，是非延迟、非掺杂的深蓝色荧光OLED中最好的结果之一。此外，SP基掺杂的OLED显示出优异的近紫外（NUV）发光性能，在406 nm处的CIE坐标为（0.157，0.046），EQE max为7.5%，这也是具有可比NUV OLED应用的材料中的竞争结果。
Efficient deep-blue emitters with nice color purity are fundamental in organic light-emitting diode (OLED) applications. Herein, we report two phenanthroimidazole (PPI) derivative deep-blue emitters (DP,SP) with hybrid local and charge-transfer (HLCT) properties of high photoluminescence quantum yield (PLQY) and nice color purity. More importantly, the horizontal dipole orientation (Θ//) of them are both superior to the isotropic emitters (66.7%), especially the Θ//ofSPis 89.5%, which can greatly improve its OLED performance. As a result, non-doped OLED ofSPexhibits deep-blue emission with Commission Internationale de lEclairage (CIE) coordinate of (0.158, 0.068) and maximum external quantum efficiency (EQEmax) of 11.3%, which is nearly twice that ofDPand is one of the best results among the non-delayed, non-doped deep-blue fluorescent OLEDs. Furthermore,SP-based doped OLED displays an excellent performance of near ultraviolet (NUV) emission at 406 nm with CIE coordinate of (0.157, 0.046) and EQEmaxof 7.5%, which is also a competitive result in the materials with comparable NUV OLED applications.