高亮度掺杂红色有机电致发光器件的制备与光电性能研究

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。

Study on Optoelectronic Performance of Highly Bright Red Doping Organic Light Emitting Devices

Organic film function material is accurately evaporated, with vacuum thermal evaporation method, under the monitoring of film thickness controller with high precision. A kind of multilayer structure highly bright red organic lightemitting device is developed, with the host and doping material evaporated at the same time in the same vacuum chamber as the emitting layer, the typical structure of which is ITO-CuPc(20 nm)-αNPD(60 nm)-Alq3 (40 nm)∶Rubrene(10%)∶DCJTB(1%)-Alq3(20 nm)-LiF(10 nm)-Al(100 nm). The results show that the brightness increases linearly with the driving voltage of 5～52 V. The electroluminescent spectrum of the device shifts to the blue region, the wavelength of the emission peak changes from 638 nm to 632 nm, and at the same time, the color coordinates CIE change accordingly. When the driving voltage is low (5 V), the luminous efficiency peaks with 0.497 lm·W-1, which declines slowly with the rise of driving voltage.