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运用原子力显微镜研究了MADN(2-methyl-9,10-di(2-naphthyl)anthracene)和NPB(N.N’-Bis(naphthalene-1-yl)-N,N’-bis(phenyl)-benzidine)的混合溶液在不同比率下旋涂所成膜的形貌特征,发现所有比率下旋涂所成膜的表面无针孔是均一、平整的.用旋涂成膜的方法制备了以MADN和NPB为混合主体的白光有机电致发光器件并研究了不同混合比率对器件性能的影响,器件的发光层由混合主体和掺杂的蓝光发射染料4,4’-bis[2-(4-(N,N-diphenyl amino)phenyl)vinyl]biphenyl以及黄光染料5,6,11,12-tetraphenylnaphacene构成,通过旋涂的方法成膜.实验结果显示器件的亮度和电流效率依赖着混合主体的比率,NPB:MADN的比率为60:40时器件性能最优,该比率下器件的最高亮度可达到24671cd/m2,在1000cd/m2的亮度下电流效率可达到5.8cd/A,并且器件的发光颜色几乎不随工作电压而变化.为低成本的制备基于小分子材料的白光器件提供了一种思路,并避免共蒸镀制备掺杂器件时工艺复杂、掺杂浓度难以精确控制、器件重复性差的问题.
Atomic force microscopy was used to study the effects of MADN (2-methyl-9,10-di (naphthyl) anthracene) and NPB (N.N’-Bis benzidine was spin-coated at different ratios. It was found that no pinhole was uniformly and flatly formed on the surface of the films formed by spin-coating at all ratios.MSPN films with MADN And NPB as the main body of hybrid white light organic electroluminescent devices and studied the effect of different mixing ratio on the performance of the device. The light emitting layer of the device is composed of a mixed host and doped blue light emitting dye 4,4’-bis [2- (4- (N, N-diphenyl amino) phenyl) vinyl] biphenyl and the yellow dye 5,6,11,12-tetraphenylnaphacene, and the film formation was achieved by spin-coating. The experimental results show that the brightness and current efficiency of the device depend on the Ratio, NPB: MADN ratio of 60:40 device performance is optimal, the device under the maximum brightness of up to 24671cd / m2, 1000cd / m2 brightness at current efficiency up to 5.8cd / A, and the device’s light The color almost does not change with the working voltage.It provides an idea for low-cost preparation of white light devices based on small molecule materials, And avoids the problem of complex process, difficult to control the doping concentration accurately and poor repeatability of the device when the co-deposition process is used to prepare the doping device.