基于激基复合物的高显色指数白光有机发光二极管  

White Organic Light-Emitting Diodes with High Color-Rendering Index Based on Exciplex

作　　者：付祥恩 杨飞宇 唐宇 Xiang'en Fu;Feiyu Yang;Yu Tang(College of Science,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学理学院,上海200093

出　　处：《激光与光电子学进展》2020年第21期277-282,共6页Laser & Optoelectronics Progress

摘　　要：显色指数是白光有机发光二极管的重要评价参数。为了得到具有高显色指数的白光有机发光二极管,采用真空蒸镀法制备了一系列器件。以NPB∶TPBi(1∶1)形成的激基复合物作为蓝色发光层可以降低白光有机发光二极管的制备难度和成本。与单层激基复合物发光层(3 nm)器件相比,采用双层激基复合物发光层(1.5 nm×2)有助于平衡激子分布,提高器件的显色指数。在此基础上,通过改变间隔层的厚度来调整激子的Dexter能量传输。当间隔层1(Spacer 1)的厚度为2 nm时,暖白光器件B2的最大功率效率为16.11 lm/W,其在5 V驱动电压下的显色指数高达95,其相关色温为2322 K。The color rendering index(CRI)is an important evaluation parameter of white organic light-emitting diodes(WOLEDs).We fabricated a series of devices by vacuum evaporation to obtain WOLEDs with high CRI.The exciplex formed by NPB∶TPBi(1∶1)as a blue emission layer can reduce the difficulty and cost of fabrication of WOLEDs.Comparing this to a device with an exciplex emitting layer(3 nm),the device with the double-exciplex emitting layers(1.5 nm×2)helps to balance the exciton distribution and improves the CRI.Furthermore,the thickness of the spacer is changed to adjust the Dexter energy transmission of the exciton.When the thickness of the spacer layer 1(Spacer 1)is 2 nm,the maximum power efficiency of the warm white light device B2 is 16.11 lm/W,the CRI is as high as 95 under a driving voltage of 5 V,and its correlated color temperature is 2322 K.

关 键 词：光学器件 白光有机发光二极管 激基复合物 显色指数 间隔层 

分 类 号：TN383[电子电信—物理电子学]