利用蓝色有机发光二极管激发荧光色彩转换膜的方法,制备了一种新型的白色有机电致发光器件。蓝色有机发光二极管的发光层采用4,4’-Bis(carbazol-9-yl)biphenyl(CBP)主体掺杂高效蓝色荧光染料N-(4-((E)-2-(6-((E)-4-(diphenylamino)styryl)naphthalen-2-yl)vinyl)phenyl)-N-phenylbenzenamine(N-BDAVBi)来制备。有机/无机复合色彩转换膜是将有机荧光颜料VQ-D25和无机荧光粉掺铈钇铝石榴石(YAG:Ce^3+)按一定的重量比均匀分散到-[CH3CH2COOCH3]n-(PMMA)中来制备。获得了色稳定性较高的白色有机电致发光器件。当驱动电压由6升至14V时,器件光谱非常稳定且CIE色坐标仅从(0.354,0.304)变化到(0.357,0.312),其最高电流效率约为5.8cd·A^-1(4.35mA·cm^-2),最高亮度为16800cd·m^-2(14V)。
The authors report a novel white organic light-emitting device (WOLED),which uses a strategy of exciting organic/inorganic color conversion film with a blue organic light-emitting diode (OLED).The luminescent layer of the blue OLED was prepared by use of CBP host blended with a blue highly fluorescent dye N-BDAVBi.The organic/inorganic color conversion film was prepared by dispersing a mixture of red pigment VQ-D25 and YAG:Ce^3+ phosphor in PMMA.The authors have achieved a novel WOLED with the high color stability by optimizing the thickness and fluorescent pigment concentration of the color conversion film.When the driving voltage varied between 6 and 14 V,the color coordinates (CIE) varied slightly from (0.354,0.304) to (0.357,0.312) and the maximum current efficiency is about 5.8 cd·A^-1(4.35 mA·cm^-2),the maximum brightness is 16 800 cd·m^-2 at the operating voltage of 14 V.