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制备了结构为ITO/NPB/CBP:TBPe:rubrene/BAlq:Ir(piq)2(acac)/BAlq/Alq3/Mg:Ag的白色磷光有机电致发光器件.利用两种不同的主体材料,即用双载流子传输型主体材料CBP掺杂荧光染料TBPe及rubrene作为蓝光和橙黄光发光层;用电子传输型主体材料BAlq掺杂磷光染料Ir(piq)2(acac)作为红色发光层.以上双发光层夹于空穴传输层NPB与具有电子传输性的阻挡层BALq之间.讨论了如何控制染料的掺杂浓度,来得到高亮度的纯白光发射,以及如何利用各主体间的异质结,来平衡载流子在各发光层的分布,从而使白光器件获得较高的色稳定性.制备的纯白光器件在4·2V电压下启亮,在8·5V下获得的最大外量子效率为1·5%,13V下获得的色标标为(0·334,0·339),在17V下的发光亮度为15000cd/m2.当驱动电压从10V升高到15V时,器件色坐标由(0·368,0·389)改变为(0·314,0·327).由于该白光器件拥有较高的色纯度和较好的色稳定性,其更加适合作为液晶显示的背光源或与彩色滤色膜匹配进而获得全色显示.
A white phosphorescent organic electroluminescent device with a structure of ITO / NPB / CBP: TBPe: rubrene / BAlq: Ir (piq) 2 (acac) / BAlq / Alq3 / Mg: Ag was prepared using two different host materials, The double-carrier-type host material CBP is doped with the fluorescent dyes TBPe and rubrene as the blue and orange yellow light emitting layers, and the phosphorescent dye Ir (piq) 2 (acac) is doped as the red light emitting layer with the electron transporting host material BAlq. The double light-emitting layer is sandwiched between hole transporting layer NPB and electron-transporting barrier BALq, and how to control the doping concentration of the dye to obtain high-brightness pure white light emission and how to utilize the heterogeneity Junction to balance the distribution of carriers in the light-emitting layer, so that white light devices to obtain higher color stability prepared pure white light devices at 4.2V voltage turn on the bright, the maximum external quantum obtained at 8.5V The efficiency is 1.5%, and the color scale obtained at 13V is (0 · 334,0 · 339) and the luminous brightness is 15000cd / m2 at 17 V. When the driving voltage is increased from 10V to 15V, the device color coordinate (0 · 368, 0 · 389) to (0 · 314, 0 · 327) .Because of its high color purity and good color stability Was added as a backlight for a liquid crystal display or the color filter film and thus obtain a full color display match.