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利用蓝色有机发光二极管(BOLED)激发色彩转换膜的方法,制备了一种新型的白色有机电致发光器件(WOLED)。BOLED的发光层采用CBP主体掺杂高效蓝色荧光染料N-BDAVBi来制备;色彩转换膜是将橙红色荧光颜料VQ-D24均匀分散到A、B环氧树脂中涂敷、固化而成。通过调整与分析转换膜的厚度和荧光颜料的掺杂比例来优化白光器件的发光光谱,获得了色稳定性较高的WOLED。当驱动电压由7V升至14V时,WOLED的色坐标(CIE)仅在(0.33,0.32)和(0.34,0.28)间变化,器件最高电流效率约为7.3cd/A(4.35mA/cm2),最高亮度为12000cd/m2(14V)。
A novel white organic electroluminescent device (WOLED) was fabricated by using a blue organic light emitting diode (BOLED) to excite a color conversion film. The light-emitting layer of BOLED is prepared by doping high-efficiency blue fluorescent dye N-BDAVBi with a CBP host. The color conversion film is prepared by uniformly dispersing orange-red fluorescent pigment VQ-D24 into A and B epoxy resins and curing. By adjusting and analyzing the thickness of the conversion film and the doping ratio of the fluorescent pigment to optimize the emission spectrum of the white light device, a WOLED with high color stability is obtained. When the driving voltage is increased from 7V to 14V, the color coordinate (CIE) of WOLED only changes between (0.33,0.32) and (0.34,0.28), and the maximum current efficiency of the device is about 7.3cd / A (4.35mA / cm2) The maximum brightness of 12000cd / m2 (14V).