【摘要】 分别将具有空穴传输特性的蓝光材料-βNPB和具有电子传输特性的蓝绿光材料Zn(BTZ)2作为2层发光层,将荧光染料rubrene掺入-βNPB中,在发光层间引入5 nm具有空穴阻挡作用的BCP层,制备了一种ITO/PVK:-βNPB:rubrene/BCP/Zn(BTZ)2/Mg:Ag/Ag结构白色有机电致发光器件(OLED)。该器件在5 V电压下起亮;18 V电压下亮度和色坐标分别为1 600 cd/m2和(0.31,0.33),最大外量子效率为0.21%。其色度比不含或含较厚BCP层(>5 nm)的器件均有了很大的改善,并从能带结构和空穴阻挡层厚度2方面探讨了色度改善的原因。更多还原

【Abstract】 We reported a type of pure white organic light emitting device（OLED） with a double-layered structure which consists of a blue emitting layer β-NPB with hole-transport characteristics that is doped with an orange-red dye rubrene and a greenish-blue emitting layer Zn（BTZ）₂ with electron-transport characteristics.Between these two emitting layers,a BCP hole-block layer（5 nm） was introduced to improve the chromaticity of the white OLED whose configurations was ITO/PVK:β-NPB:rubrene/BCP/Zn（BTZ）₂/Mg:Ag/Ag.With a lower turn-on voltage of about 5 V,the white OLED showed a maximum quantum efficiency of 0.21%,a brightness of 1 600 cd/m² and the CIE coordinates of（0.31,0.33） at 18 V.Compared with the device without BCP and the device with the BCP thickness more than 5 nm,the chromaticity of the device with the optimum BCP thickness was greatly improved.Meanwhile,we also discussed the reason of the results mentioned above about the device’s energy level and the thickness of the hole-block layer.更多还原