发光层中能级梯度对蓝色有机发光二极管的影响  

Effect of Energy Level Gradient in Emitting Layer on Blue Organic Light-Emitting Diode

作　　者：杨璐璐 杨丽萍 Yang Lulu;Yang Liping(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19期238-243,共6页Laser & Optoelectronics Progress

基　　金：上海市教委重点创新项目(14ZZ137)。

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。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.

关 键 词：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 

分 类 号：TN383.1[电子电信—物理电子学]