顶发射白光OLED微型显示器的蓝光掺杂特性研究

白光OLED微型显示器在信息显示领域具有重要的应用。采用真空镀膜系统，依次蒸镀Ag/ITO复合薄膜作为阳极结构，共蒸制备Mg∶Ag复合膜作为半透明阴极结构，NPB作为空穴传输材料和黄光主体材料，rubrene作为黄光掺杂料，AND作为蓝光主体料，DSA-Ph作为蓝光掺杂料，Alq3作为电子传输材料，以结构和工艺简化的蓝、黄光互补色来实现白光，通过共蒸发形式制备了结构为Ag/ITO/NPB/NPB∶rubrene（1.5%）/ADN∶DSA-Ph（x%/x=2，5，8）/Alq3/Mg∶Ag的白光OLED微型显示器，利用由Photo Research PR655光谱仪、Keithley 2400程控电源组成的光谱测试系统对器件的光电性能进行表征，研究了蓝光掺杂比对白光OLED微型显器性能的影响。结果表明，随着蓝光掺杂比的增加，白光OLED微型显示器的亮度先增加后降低，蓝光、黄光峰位有所偏移，色坐标发生一定的漂移，蓝光色纯度增加，可通过调控发光材料掺杂比实现白光OLED微型显示器性能的可控制备。初步优化获得的蓝、黄混合白光OLED微型显示器的器件，当驱动电压为5.0 V时，器件亮度达到3 679 cd·m-2，CIE坐标为（0.263，0.355）。

Study on Blue Dopant Ratio on the Performance of TOP-Emitting White OLED Microdisplays

White OLED microdisplays have an important application in the field of information display. In this paper, The vacuum coating system is used to sequentially deposit an Ag/ITO composite film as the anode structure and Mg: Ag composite film is co-distilled to form a translucent cathode structure. NPB is used to hole transport material and yellow light host material, rubrene as yellow light dopant, AND as blue host material, DSA-Ph as blue light dopant and Alq3 as electron transport material. The white OLED microdisplay structure with blue and yellow complementary colors prepared by co-evaporation is Ag/ITO/NPB/NPB∶rubrene (1.5%)/ADN∶DSA-Ph(x%/x=2, 5, 8)/Alq3/Mg∶Ag. The photoelectric performance of the device was characterized by a spectral testing system consisting of Photo Research PR655 spectrometer and Keithley 2400 program-controlled power supply. The effect of blue light doping ratio on the performance of white OLED microdisplay was studied. The result shows that with the increase of blue doping ratio, the brightness of white OLED microdisplay increases first and then decreases, the blue and yellow peaks shift to a certain extent, the color coordinates have a certain drift aod the blue color purity increases. The performances of white OLED microdisplays can be controlled by doping material ratio. The optimized emitting structure of white OLED microdisplay is NPB: rubrene (1.5%) /ADN: DSA-Ph (5%), The device brightness is 3 679 cd·m-2 and the CIE coordinates is (0.263, 0.355) with the driving voltage being 5.0 V.