Physics Department, Durham University, South Road, Durham, DH1 3LE, United Kingdom.
Department of Chemistry, Durham University, South Road, Durham, DH1 3LE, United Kingdom.
Sci Rep. 2017 Jul 24;7(1):6234. doi: 10.1038/s41598-017-06568-3.
We report on the engineering of full thermally activated delayed fluorescence - based white organic light emitting diodes (W-OLEDs) composed of three emitters (2,7-bis(9,9-dimethyl-acridin-10-yl)-9,9-dimethylthioxanthene-S,S-dioxide (DDMA-TXO2), 2,7-bis(phenoxazin-10-yl)-9,9-dimethylthioxanthene-S,S-dioxide (DPO-TXO2) and 3,11-di(10H-phenoxazin-10-yl)dibenzo[a,j]phenazine (POZ-DBPHZ) in two different hosts. By controlling the device design through the study of the emission of DDMA-TXO2 and DPO-TXO2, the behaviour of POZ-DBPHZ in a device with more than one emitter, and the combination of the three materials, respectively, we show that external quantum efficiencies as high as 16% can be obtained for a structure with a correlated colour temperature close to warm white, together with colour rendering index close to 80. However it is in their performance stability that provides the true breakthrough: at 1000 cd/m the efficiencies were still above 10%, which is one of the best for this type of devices.
我们报告了全热激活延迟荧光基白色有机发光二极管 (W-OLED) 的工程设计，该器件由三种发光体（2,7-双(9,9-二甲基吖啶-10-基)-9,9-二甲基噻吨-S,S-二氧化物 (DDMA-TXO2)、2,7-双(吩恶嗪-10-基)-9,9-二甲基噻吨-S,S-二氧化物 (DPO-TXO2) 和 3,11-双(10H-吩恶嗪-10-基)二苯并[a,j]吩嗪 (POZ-DBPHZ)）在两个不同的主体中组成。通过控制器件设计，研究 DDMA-TXO2 和 DPO-TXO2 的发射、POZ-DBPHZ 在具有多个发光体的器件中的行为以及三种材料的组合，我们表明，对于具有接近暖白色相关色温的结构，可以获得高达 16%的外量子效率和接近 80 的显色指数。然而，真正的突破在于它们的性能稳定性：在 1000 cd/m 时，效率仍高于 10%，这是此类器件中最好的之一。
