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采用真空热蒸镀的方法,以荧光染料1-(2,5-dimethoxy-4-(1-pyrenyl)-phenyl)pyrene(DOPPP)为蓝发光层,5,6,11,12-Tetraphenylnaphthacene(Rubrene)为黄发光层,制备了结构为ITO/m-MTDATA(10nm)/NPB(30nm)/Rubrene(0.2nm)/DOPPP(xnm)/TAZ(10nm)/Alq3(30nm)/LiF(0.5nm)/Al的双发光层的高效白色有机电致发光器件(OLED)。通过调整DOPPP层的厚度,研究器件的发光性能。当DOPPP层厚小于25nm时,器件以黄光发射为主;当DOPPP层厚为25nm时器件的性能最佳,在电流密度为209.18mA/cm2时,获得最大亮度为9 232cd/m2,在电流密度为103.712mA/cm2时获得最大电流效率4.68cd/A,并随着驱动电压的升高,器件的色坐标从(0.366,0.365)变化到(0.384,0.399),都在白光的范围之内;当DOPPP层厚度超过25nm时,器件的效率和亮度都开始下降。
Using vacuum thermal evaporation method, the blue luminescent layer of 5,6-epoxy-4- (1-pyrenyl) -phenyl pyrene (DOPPP) and the blue luminescent layer of 5,6,11,12-Tetraphenylnaphthacene ) Was used as the yellow light emitting layer to prepare the ITO / m-MTDATA (10nm) / NPB (30nm) / Rubrene (0.2nm) / DOPPP (xnm) / TAZ (10nm) / Alq3 (30nm) / LiF / Al double light emitting layer of high efficiency white organic electroluminescent device (OLED). By adjusting the thickness of the DOPPP layer, the device luminescence properties. When the DOPPP layer thickness is less than 25nm, the device mainly emits yellow light. When the DOPPP layer thickness is 25nm, the device performance is the best. When the current density is 209.18mA / cm2, the maximum brightness is 9 232cd / m2, The maximum current efficiency of 4.68cd / A was obtained at a density of 103.712mA / cm2. With the increase of the driving voltage, the color coordinates of the device changed from (0.366,0.365) to (0.384,0.399), all within the range of white light When the DOPPP layer thickness exceeds 25nm, the device efficiency and brightness begin to decline.