Twisted Intramolecular Charge Transfer State for Long-Wavelength Thermally Activated Delayed Fluorescence
Twisted Intramolecular Charge Transfer State for Long-Wavelength Thermally Activated Delayed Fluorescence
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DOI：
10.1021/cm402428a
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发表时间：
2013-09-24
影响因子：
8.6
通讯作者：
Adachi, Chihaya
中科院分区：
文献类型：
--
作者：
Tanaka, Hiroyuki;Shizu, Katsuyuki;Adachi, Chihaya
研究了固态薄膜中热激活延迟荧光从绿色到橙子的发射波长调谐。发射调谐通过稳定吩恶嗪（PXZ）供体单元和2，4，6-三苯基-1，3，5-三嗪（TRZ）受体单元之间的分子内电荷转移状态而发生，所述受体单元被大扭转角分开。单，双，和三-PXZ取代的TRZ的发射波长表现出逐渐的红移，同时保持一个小的能隙之间的单重态和三重态激发态。含有三-PXZ-TRZ发射体的有机发光二极管表现出13.3 +/-0.5%的最大外量子效率，具有黄橙色发射。
Emission wavelength tuning of thermally activated delayed fluorescence from green to orange in solid state films is demonstrated. Emission tuning occurs by stabilization of the intramolecular charge transfer state between a phenoxazine (PXZ) donor unit and 2,4,6-triphenyl-1,3,5-triazine (TRZ) acceptor unit separated by a large twist angle. The emission wavelengths of mono-, bis-, and tri-PXZ-substituted TRZ exhibit a gradual red shift while maintaining a small energy gap between the singlet and triplet excited states. An organic light-emitting diode containing a tri-PXZ-TRZ emitter exhibited a maximum external quantum efficiency of 13.3 +/- 0.5% with yellow-orange emission.