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采用真空热蒸镀的方法,在高精度膜厚控制仪监控下,实现了有机薄膜功能材料的精确蒸镀,其中发光层采用主体材料与掺杂材料在一个真空腔体同时共同蒸发,制备了一种高亮度多层结构的红色有机电致发光(OLED)器件:ITO-CuPc(20 nm)--αNPD(60 nm)-Alq3(40 nm)∶Rubrene(10%)∶DCJTB(1%)-Alq3(20 nm)-LiF(10 nm)-Al(100 nm)。研究发现:驱动在电压为5~52 V变化时,其亮度基本满足线性增加关系,随之饱和;随着驱动电压的变化,其电致发光光谱有蓝移的现象,发射峰从638 nm变到632 nm,同时色坐标CIEx,y值也发生相应的变化;器件的流明效率在驱动电压较低时(V=5 V),达到最大值ηLmax=0.497 lm.W-1,随着驱动电压的增加,流明效率有降低的趋势。
Using vacuum thermal evaporation method, under the control of a high-precision film thickness controller, an accurate vapor deposition of the functional material of the organic thin film is realized, wherein the light-emitting layer is co-evaporated with a host material and a doping material simultaneously in a vacuum chamber to prepare A red organic electroluminescent (OLED) device with high brightness and multilayer structure: ITO-CuPc (20 nm) - αNPD (60 nm) -Alq3 (40 nm): Rubrene (10%): DCJTB -Alq3 (20 nm) -LiF (10 nm) -Al (100 nm). The results show that the brightness of the driver increases linearly with the increase of the voltage from 5 V to 52 V, and then increases with the increase of the driving voltage. The emission spectrum changes from 638 nm to At 632 nm, the color coordinate values of CIEx and y also change correspondingly. When the driving voltage is low (V = 5 V), the lumens efficiency of the device reaches the maximum ηLmax = 0.497 lm.W-1. With the increase of driving voltage The increase of lumens efficiency has decreased.