有机发光二极管
咔唑
电致发光
材料科学
光化学
共发射极
量子效率
取代基
单重态
激发态
荧光
激子
光电子学
化学
光学
原子物理学
纳米技术
有机化学
量子力学
物理
图层(电子)
作者
Wu Shi-Kang,Masaki Aonuma,Qisheng Zhang,Shuping Huang,Tetsuya Nakagawa,Kosuke Kuwabara,Chihaya Adachi
摘要
Highly efficient deep-blue thermally activated delayed fluorescence (TADF) is observed from a charge-transfer compound bis[4-(3,6-dimethoxycarbazole)phenyl]sulfone (DMOC-DPS). In comparison with the previously reported carbazole/sulfone derivative with tert-butyl substituents on the carbazole donors, DMOC-DPS exhibits a much shorter excited-state lifetime in both an aromatic solution and an organic thin film, because the change of the substituent on the donor affects the molecular energy levels of the first singlet (S1) and triplet (T1) excited states in different ways, decreasing the energy gap between S1 and T1 (ΔEST). An organic light emitting diode (OLED) based on DMOC-DPS achieves a maximum external electroluminescence quantum efficiency (EQE) of 14.5% and reduced efficiency roll-off, with Commission Internationale de L'Eclairage (CIE) coordinates of (0.16, 0.16), owing to efficient exciton harvesting that occurs through triplet-to-singlet up-conversion.
科研通智能强力驱动
Strongly Powered by AbleSci AI