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顶发射白光有机发光二极管(TEWOLED)在白光照明和全彩显示中有着良好的应用前景,克服顶发射器件中的微腔效应是制备光电性能良好的TEWOLED的前提.使用具有高折射率的ZnS作为增透膜改善金属阴极在蓝光波段的透射率,降低其反射性,从而有效抑制了微腔的影响.同时利用转移矩阵理论和宽角干涉方法分别对阴极结构和蓝光发光层位置进行了优化,最终获得了高效、色纯度良好、色度随视角变化小的TEWOLED.最高亮度和效率分别达到9213 cd/m~2和3 cd/A,色坐标位于白光区且接近白光等能点,同时具有良好的视角稳定性,在0°-60°范围内色坐标仅变化(0.02,0).
Top-emitting white organic light-emitting diode (TEWOLED) has good application prospects in white light illumination and full-color display, overcoming the microcavity effect in the top-emitting device is a prerequisite for preparing a good electro-optical performance TEWOLED.Using ZnS with high refractive index as the AR coating can improve the transmissivity of the metal cathode in the blue waveband and reduce its reflectivity, thus effectively suppressing the effect of the microcavity.At the same time, the positions of the cathode structure and the blue light emitting layer are optimized respectively by the transfer matrix theory and the wide angle interference method, Finally, we obtained TEWOLED with high efficiency, good color purity and small change of chromaticity with viewing angle.The maximum brightness and efficiency are respectively 9213 cd / m ~ 2 and 3 cd / A, the color coordinates are located in the white region and close to the white point, Good viewing stability, the color coordinates within the range of 0 ° -60 ° only change (0.02,0).