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Highly Efficient Purely Organic Phosphorescence Light-Emitting Diodes Employing a Donor–Acceptor Skeleton with a Phenoxaselenine Donor
Advanced Science ( IF 14.3 ) Pub Date : 2023-02-20 , DOI: 10.1002/advs.202207003
Zijian Chen 1 , Mengke Li 1 , Qing Gu 1 , Xiaomei Peng 1 , Weidong Qiu 1 , Wentao Xie 1 , Denghui Liu 1 , Yihang Jiao 1 , Kunkun Liu 1 , Jiadong Zhou 1 , Shi-Jian Su 1
Advanced Science ( IF 14.3 ) Pub Date : 2023-02-20 , DOI: 10.1002/advs.202207003
Zijian Chen 1 , Mengke Li 1 , Qing Gu 1 , Xiaomei Peng 1 , Weidong Qiu 1 , Wentao Xie 1 , Denghui Liu 1 , Yihang Jiao 1 , Kunkun Liu 1 , Jiadong Zhou 1 , Shi-Jian Su 1
Affiliation
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Purely organic room-temperature phosphorescence (RTP) materials generally exhibit low phosphorescence quantum yield (ϕP) and long phosphorescence lifetime (τP) due to the theoretically spin-forbidden triplet state. Herein, by introducing a donor–acceptor (D–A) skeleton with a phenoxaselenine donor, three nonaromatic amine donor containing compounds with high ϕP and short τP in amorphous films are developed. Besides the enhanced spin–orbit coupling (SOC) by the heavy-atom effect of selenium, the D–A skeleton which facilitates orbital angular momentum change can further boost SOC, and severe nonradiative energy dissipation is also suppressed by the rigid molecular structure. Consequently, a record-high external quantum efficiency of 19.5% are achieved for the RTP organic light-emitting diode (OLED) based on 2-(phenoxaselenin-3-yl)-4,6-diphenyl-1,3,5-triazine (PXSeDRZ). Moreover, voltage-dependent color-tunable emission and single-molecule white emission are also realized. These results shed light on the broad prospects of purely organic phosphorescence materials as highly efficient OLED emitters especially for potential charming lighting applications.
中文翻译：
高效纯有机磷光发光二极管，采用供体-受体骨架和苯氧硒氨酸供体
由于理论上自旋禁止的三重态，纯有机室温磷光 (RTP) 材料通常表现出低磷光量子产率 ( ϕ P ) 和长磷光寿命 ( τ P )。在此，通过引入具有苯氧硒啉供体的供体-受体 (D-A) 骨架，三个非芳族胺供体化合物具有高 ϕ P和短τ P开发了非晶薄膜。除了硒的重原子效应增强的自旋轨道耦合 (SOC) 外，促进轨道角动量变化的 D-A 骨架可以进一步提高 SOC，刚性分子结构也抑制了严重的非辐射能量耗散。因此，基于 2-(phenoxaselenin-3-yl)-4,6-diphenyl-1,3,5-triazine 的 RTP 有机发光二极管 (OLED) 实现了创纪录的 19.5% 的外量子效率（PXSeDRZ）。此外，还实现了电压依赖性颜色可调发射和单分子白光发射。这些结果揭示了纯有机磷光材料作为高效 OLED 发光体的广阔前景，尤其是在潜在的迷人照明应用中。
更新日期：2023-02-20
中文翻译：
高效纯有机磷光发光二极管，采用供体-受体骨架和苯氧硒氨酸供体
由于理论上自旋禁止的三重态，纯有机室温磷光 (RTP) 材料通常表现出低磷光量子产率 ( ϕ P ) 和长磷光寿命 ( τ P )。在此，通过引入具有苯氧硒啉供体的供体-受体 (D-A) 骨架，三个非芳族胺供体化合物具有高 ϕ P和短τ P开发了非晶薄膜。除了硒的重原子效应增强的自旋轨道耦合 (SOC) 外，促进轨道角动量变化的 D-A 骨架可以进一步提高 SOC，刚性分子结构也抑制了严重的非辐射能量耗散。因此，基于 2-(phenoxaselenin-3-yl)-4,6-diphenyl-1,3,5-triazine 的 RTP 有机发光二极管 (OLED) 实现了创纪录的 19.5% 的外量子效率（PXSeDRZ）。此外，还实现了电压依赖性颜色可调发射和单分子白光发射。这些结果揭示了纯有机磷光材料作为高效 OLED 发光体的广阔前景，尤其是在潜在的迷人照明应用中。
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