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研制了一种以照明为目标的有机白光发光二极管(WOLED),该二极管在8V时的色度坐标为(x=0.319,y=0.337),对应的显色指数(Ra)为85.4,色温(Tc)为6151K。该二极管是含NPB和CBP两个基质的多层掺杂型结构器件;此外,NPB{4,4-′bis[N-(1-naphthyl)-N-phenylamino]biphenyl}除了用作绿光和黄光基质外,还用作空穴传输材料,CBP{4,4-′N,N′-dicarbazole-biphenyl}用作红光磷光配合物的基质材料。3个掺杂层分别提供白光发射的红、黄和绿光成分,而蓝光成分则来自于空穴传输层NPB本身的发射。该器件在直流电流密度为0.1mA/cm2时最大白光发光效率可达5.6cd/A(3.9lm/W),在15V时达到的最大亮度为5100cd/m2。其性能参数达到了白光照明光源的要求。
An organic white light emitting diode (WOLED) with illumination of 8 × V was fabricated. The chromaticity coordinate of the diode was (x = 0.319, y = 0.337) and the corresponding color rendering index Tc) is 6151K. The diode is a multilayer doped structure device containing two substrates of NPB and CBP. In addition, NPB {4,4-bis [N- (1-naphthyl) -N-phenylamino] biphenyl} Yellow matrix, but also as a hole transport material, CBP {4,4-’N, N’-dicarbazole-biphenyl} as a red phosphorescent complex matrix material. The three doping layers provide the red, yellow and green components of white light respectively, while the blue light component comes from the emission of the hole transport layer NPB itself. The device achieves maximum white light emission efficiency of 5.6cd / A (3.9lm / W) at a DC current density of 0.1mA / cm2 and a maximum brightness of 5100cd / m2 at 15V. Its performance parameters meet the requirements of white light source.