高亮度低启亮绿光有机电致发光器件  

High brightness and low turn-on green organic electroluminescent device

作　　者：杨明军 钱雅翠 余睿 尹洋 牛连斌[1] 关云霞[1] YANG Ming-jun;QIAN Ya-cui;YU Rui;YIN Yang;NIU Lian-bin;GUAN Yun-xia(Chongqing Key Laboratory of Optical Electronic Functional Materials,Optical Engineering Key Laboratory of Chongqing Municipal Education Commission,College of Physics and Electronic Engineering,Chongqing Normal University,Chongqing 401331,China)

机构地区：[1]重庆师范大学物理与电子工程学院重庆市光电功能材料重点实验室重庆市高校光学工程重点实验室

出　　处：《光电子．激光》2019年第11期1128-1132,共5页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(61874016,11875010);重庆市基础科学与前沿技术研究专项项目(CSTC 2017jcyjAX0333,CSTC 2019 jcyj-msxmX0148);重庆市特殊人才支持计划(T04040003);重庆市洁净能源材料与技术重点实验室开放基金(JJNY 201907,JJNY201905)资助项目

摘　　要：为了得到高亮度且低启亮的OLED器件,本文将价格低廉的氧化钼(MoO3)作为器件的空穴注入层,通过真空热蒸发法制备了结构为ITO/MoO3(:y nm)/NPB(60 nm)/Alq3(80 nm)/CsCl(0.5 nm)/Al(120 nm)的有机电致发光器件。通过比较(:y=1,3,5,7 nm)四种厚度MoO3薄膜制作的器件性能,分析器件的J-V和L-V等数据发现,当Mo03薄膜的厚度为5 nm时,器件启亮电压仅为2.5 V;当器件电压为9.25 V时,得到最大亮度43580 cd/m^2。当电流密度为647.92 mA/cm^2时,器件最大电流效率6.73 cd/A。器件的亮度和启亮电压性能同时达到最佳。相比于普通的标准器件,发光亮度和电流效率分别提高了4倍和3.3倍。分析可知,MoO3作为器件的空穴注入层,降低了器件阳极和空穴传输层之间的势垒高度,器件发光层产生了更多的电子-空穴对,使得器件的性能得到了提高,也为降低OLED生产成本开辟了一条新途径。In recent years,the rapid development of organic light-emitting diode(OLED)in the field of illumination and display has made it one of the strong competitors of the new generation of light-emitting devices.OLED has the advantages of self-luminescence,wide viewing angle,high contrast,low power consumption,high reaction rate,full color and simple process.However,in terms of large panel price,technology selectivity,life,resolution,and color reproduction,it cannot compete with thin film transistor liquid crystal display(LCD).Organic light-emitting diode displays can be classified into monochrome,colorful,and full-color.In order to obtain an organic electroluminescent device with higher brightness and lower on-voltage,molybdenum oxide(Mo03)and high electron transport properties of cesium chloride(CsCl)are used as the hole injection layer and electron injection layer of the device»respectively.In this paper,an organic electroluminescent device having a structure of ITO/Mo03(ynm)/NPB(60 nm)/Alq3(80 nm)/CsCl(0.5 nm)/Al(120 nm)was prepared using Mo03 as a hole injection layer.By comparing the performance of devices fabricated with four thicknesses of Mo03 films(3;=1,3,5,7nm),data such as current density-voltage(J-V)and luminance-voltage(L-V)were analyzed.When the thickness of the Mo03 film was 5 nm,the device was only turned on,it is 2.5 V.When the device voltage is 9.25 V,a maximum luminance of 43580 cd/m^2 is obtained When the current density is 647.92 mA/cm^2,the maximum current efficiency of the device is 6.73 cd/A*Compared with ordinary standard devices,the luminance and current efficiency are increased by 4 times and 3.3 times,respectively.As can be seen from the analysis,Mo03 acts as a hole injection layer of the device,which lowers the barrier height between the anode and the hole transport layer of the device,and the device light-emitting layer generates more holeelectron pairs,so that the performance of the device is improved.

关 键 词：有机电致发光 空穴注入层 偏置电压 发光亮度 

分 类 号：TN383.1[电子电信—物理电子学]