High-efficiency Blue Phosphorescent OLEDs Based on Mixed-host Structure by Solution-processed Method [基于混合主体结构的溶液法制备的高效蓝色磷光OLED]

作者：Wang Z.; Wu R.-X.; Feng Y.; Liu H.; Zhou L.

来源：Chinese Journal of Luminescence, 2022, 43(5): 763-772.

DOI：10.37188/CJL.20220049

• Blue emission
• High efficiency
• Mixed-host structure
• Organic light-emitting diodes
• Solution-processed

Blue phosphorescent organic light-emitting diodes(PHOLEDs) which utilized TcTa and CzSi as the mixed-host were fabricated to improve the efficiency by solution-processed method. Additionally, three electron transport materials Tm3PyP26PyB, TmPyPB and TPBi were employed to further enhance the efficiency of devices. The efficiency was improved by optimizing the ratio of host materials and the selection of electron transport material. Finally, the optimal device with the doping ratio TcTa:CzSi of 6:1 and 70 nm TPBi layer exhibited the maximum brightness(Bmax), current efficiency(CEmax), power efficiency(PEmax) and external quantum efficiency(EQEmax) of 6 662 cd?m-2, 39.40 cd?A-1, 23.33 lm?W-1 and 19.7%, respectively. Moreover, outstanding current efficiency and external quantum efficiency as high as 33.43 cd?A-1 and 16.7%, respectively, were obtained, even at the practical brightness of 1 000 cd?m-2.

• 单位
  稀土资源利用国家重点实验室; 东北师范大学