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分析了由正负折射率介质交替构成的分布式布拉格反射镜(DBR)的复有效折射率及其色散关系,并将其与由折射率不同的正折射率介质交替构成的DBR进行了比较;研究了由这种DBR和金属做反射镜的微腔有机发光器件(MOLED)的光学传输特性,发现这种器件具有很好的滤波功能且可使器件薄化;讨论了这种MOLED的谐振波长和归一化电致发光(EL)谱随观测角的变化关系。这些工作为进一步提高微腔OLED的发光色纯度、减小其腔长提供了新方法。
The complex effective refractive index and the dispersion relation of distributed Bragg reflecting mirrors (DBR) composed of positive and negative refractive index media are analyzed and compared with DBR composed of positive refractive index media with different refractive index. The optical transmission characteristics of a microcavity organic light-emitting device (MOLED) made of such a DBR and a metal mirror are investigated. It is found that the device has a good filtering function and can be thinned. The resonant wavelength of the MOLED And normalized electroluminescence (EL) spectra with the observed angle changes. These works provide a new method for further improving the luminescent color purity and reducing the cavity length of microcavity OLED.