激光与光电子学进展, 2020, 57 (19): 192304, 网络出版: 2020-09-27
发光层中能级梯度对蓝色有机发光二极管的影响 下载: 848次
Effect of Energy Level Gradient in Emitting Layer on Blue Organic Light-Emitting Diode
光学器件 蓝色有机发光二极管 磷光 能级梯度 高效 低效率滚降 optical devices blue organic light-emitting diode phosphorescent energy level gradient high efficiency low efficiency roll-off
摘要
利用4,4',4″-tris(N-carbazolyl)triphenyl-amine (TCTA)、N,N'-dicarbazolyl -3,5- benzene (mCP)和1,3,5-tri(m-pyridin-3-ylphenyl)benzene (TmPyPB)作为主体材料制作出一系列蓝色有机电致发光器件。由于主体材料具有不同的最低未占有分子轨道(LUMO)能级和最高占有分子轨道(HOMO)能级,通过改变发光层中的主体材料和发光层数量,形成具有不同能级梯度结构的发光层,探究不同的发光层结构对蓝色磷光有机电致发光器件性能的影响。其中采用TCTA与mCP作为主体材料的双发光层结构器件A3具有最佳的性能,其最大电流密度、最大电流效率和最大亮度分别为134.94 mA/cm 2、40.28 cd/A和12070 cd/m 2。在所有器件中,器件A3也表现出低开启电压(3.25 V)和低效率滚降的特性。
Abstract
Herein, a series of blue organic electroluminescence devices are fabricated with 4,4',4″-tris(N-carbazolyl)triphenyl-amine (TCTA), N,N'-dicarbazolyl-3,5-benzene (mCP), and 1,3,5-tri(m-pyridin-3-ylphenyl)benzene (TmPyPB) as the host materials. Owing to the different lowest unoccupied molecular orbital (LUMO) and the highest occupied molecular orbital (HOMO) energy levels of the host materials, a structure in the light-emitting layer (EML) with different energy level gradients is formed by changing the host materials and the number of EMLs. The effects of different EML structures on the performances of blue phosphorescent organic light-emitting diode are investigated. Among them, the double light-emitting layer device A3 with the host materials of TCTA and mCP obtains the best performance, and the maximum current density, the maximum current efficiency, and maximum luminance are 134.94 mA/cm 2, 40.28 cd/A, and 12070 cd/m 2, respectively. Among all devices, device A3 also exhibits the characteristics of low turn-on voltage (3.25 V) and low efficiency roll-off.
杨璐璐, 杨丽萍. 发光层中能级梯度对蓝色有机发光二极管的影响[J]. 激光与光电子学进展, 2020, 57(19): 192304. Lulu Yang, Liping Yang. Effect of Energy Level Gradient in Emitting Layer on Blue Organic Light-Emitting Diode[J]. Laser & Optoelectronics Progress, 2020, 57(19): 192304.