基于R-4B掺杂的黄色OLED器件的制备及性能优化

Preparation and performance optimization of yellow OLED based on R-4B

通过引入新型红光材料R-4B和绿光材料Ir(ppy)2acac混合来实现黄光显示.器件结构为ITO/MoO3(40nm)/NPB(40nm)/TCTA(10nm)/CBP:R-4B(x):Ir(ppy)2acac(8%)(30nm)/BCP(10nm)/Alq3(40nm)/LiF(1nm)/Al(100nm),其中x=1%、2%、3%,通过讨论掺杂浓度对器件性能的影响,得到如下结论:随着红光掺杂比例的增加,红光光强增加,发光颜色由绿色逐渐转变为黄色,但是器件整体的效率、亮度下降.当x=3%时,红光光强不再增加.综合考虑器件性能,发现当红光掺杂比例为2%时,黄色磷光OLED的性能相对最好,色坐标为(0.43 0.53),发光亮度可达4 000cd/m2,在电压为5V时,效率可达32cd/A.

In the paper,yellow phosphorescent OLEDs were prepared by mixing new red materials R-4B and green material Ir（ppy）2acac with the body material CBP together. The device structure was as follows. ITO/MoO3 （40 nm）/NPB（40 nm）/TCTA（10 nm）/CBP.R-4B （x） ：Ir（ppy）2acac（8%）（30 nm）/BCP（10 nm）/Alq3 （40 nm）/LiF（1 nm）/Al（100 nm）,x= 1%, 2%, 3%. The effect of doping concentration on OLED property was discussed in the paper. It＇s indicated： with the increasing of doping concentration, the intensity of red light was increasing and the color was from green to yellow. But the emission efficiency and brightness were decreased. The device has the best performance when x = 2 %. The maximum brightness was 4 000 cd/cm^2 ,the maximum current efficiency was 32 cd/A on 5 V,and color coordinates was （0.43 0.53）.