使用不同的有机材料作为间隔层,制备了基于CB P材料的一系列红绿双发光层有机 电致发光器件(OLED),其结构为ITO/MoO3(50nm)/NPB(40nm)/TCTA(10 nm)/CBP:R-4B(20nm,2%)/ 间隔层(3nm)/CBP:GIr1(30nm,14%)/BCP(10 nm)/Alq3(20nm)/LiF(1nm)/Al(100nm),其中间隔 层材料使用BCP、TPBi和TCTA。实验比较了加入不同间隔层后OLED的发光特性,结果显 示,对发光面积为0.8cm2的器件,当器件加入间隔层后,电流效 率和亮度有很大提高,用 TCTA作间隔层时得到器件的最大效率为39.98cd/A,最大亮度为29790cd/m2;并且使用间隔 层后OLED发光性能稳定,电致发光(EL)光谱和色坐标不随驱动电压的变化而产生变化。
Double-emitting layer(green and red) phosphorescent organic lighting emitting devices (OLEDs) were fabricated by using organic material as the interlayer.The structure of the devices is ITO/MoO3(50nm)/NPB(40nm)/TCTA(10nm)/CBP:R-4B(20nm,2%)/interlayer(3nm )/CBP: GIr1(30nm,14%)/BCP(10nm)/Alq3(20nm)/LiF(1nm)/Al(100nm).Interlayers are BC P,TPBi and TCTA,respectively.Comparing 4kinds of different interlayer mate rials,the luminescence characteristics of the devices are investigated.The results show that the current efficiency and the brightness are greatly improved because of the usage of interlayer.Using TCTA as the inter layer,we obtain the maximum efficiency of 39.98cd/A and the maximum brightnes s of 29790cd/m2.In addition,luminescent properties of OLEDs could be kept stable.EL spectra and co lor coordinates substantially don′t vary with the driving voltage.