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>Control of the dual emission from a thermally activated delayed fluorescence emitter containing phenothiazine units in organic light-emitting diodes
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Control of the dual emission from a thermally activated delayed fluorescence emitter containing phenothiazine units in organic light-emitting diodes
The development of single-component organic dual light-emitting molecules is of interest for a range of applications including white organic light-emitting diodes. Herein, a new thermally-activated delayed fluorescent molecule containing 4,6-bis-phenyl phenothiazine as donor units and 2-thiophene-1,3,5-triazine as acceptor unit was synthesized using a simple cost-effective method. This compound shows two stable molecular conformations due to the presence of the phenothiazine units in its molecular structure. These conformers exhibit different photophysical properties in both solution and thin films. The electroluminescence properties of this novel emitter were then examined in organic light-emitting diodes and the results provide useful insights into the influence of the device architecture on the dual emission characteristics. The experimental results were consistent with the optical simulations and the optimized architecture led to the fabrication of electroluminescent devices with an external quantum efficiency of 11.5% and a maximum luminance value of 10?370 cd m ~(?2) .
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机译：单组分有机双发光分子的开发对于包括白色有机发光二极管在内的一系列应用是有意义的。在此，使用简单的成本有效的方法合成了以4,6-双苯基吩噻嗪为供体单元和2-噻吩-1,3,5-三嗪为受体单元的新型热活化延迟荧光分子。由于吩噻嗪单元在其分子结构中的存在，该化合物显示出两个稳定的分子构象。这些构象异构体在溶液和薄膜中均表现出不同的光物理性质。然后在有机发光二极管中检查了这种新型发射器的电致发光特性，结果为器件结构对双发射特性的影响提供了有用的见解。实验结果与光学模拟一致，优化的结构导致电致发光器件的制造，其外部量子效率为11.5％，最大亮度值为10？370 cd m〜（？2）。
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