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由于具有较高的器件效率、开口率及分辨率,顶发射有机发光器件受到了越来越多的重视。不同于底发射器件,顶发射器件存在较为明显的微腔效应。由于微腔的作用,顶发射有机发光器件存在着发光峰随观察角度增大而蓝移的现象。针对该现象,基于微腔理论,采用光学模拟的方法得到了光谱变化微弱的顶发射器件结构,制备相应器件对理论模拟结果进行了验证。测量结果表明,器件响应波长随观察角度变化而蓝移的现象几乎可以忽略,从0°～75°,发光峰只蓝移了8 nm。由于微腔效应的效率增益效果,器件具有较高的效率。在12 V下,最大效率达到11.5 cd/A,远高于相同结构底发射器件的效率。
Due to higher device efficiency, aperture ratio and resolution, top-emitting organic light-emitting devices have received more and more attention. Unlike the bottom-emitting device, the top-emitting device has obvious microcavity effect. Due to the effect of microcavity, there is a phenomenon that the luminescence peak of the top-emitting organic light-emitting device is shifted blue with the observation angle. In view of this phenomenon, based on the microcavity theory, the structure of the top emission device with weak spectral change was obtained by optical simulation. The corresponding device was prepared to verify the theoretical simulation results. The measurement results show that the blue shift of the device response wavelength with the observation angle is almost negligible. From 0 ° to 75 °, the luminescence peak is only shifted blue by 8 nm. Due to the efficiency gain effect of microcavity effect, the device has higher efficiency. At 12 V, the maximum efficiency reaches 11.5 cd / A, well above the efficiency of the same structure bottom emitting device.