Han Jun Hee, Kim Do-Hong, Choi Kyung Cheol
Opt Express. 2015 Jul 27;23(15):19863-73. doi: 10.1364/OE.23.019863.
In this paper, in contrast with previously reported approaches, we suggest exploiting a microcavity effect using nanoparticles to improve the optical efficiency of organic light-emitting diodes (OLED). The method to input the nanoparticles inside the OLED device is simple and cost effective by virtue of employing a solution process using a spin coating fabrication method. Titanium dioxide (TiO2) nanoparticles were used to improve the reflection by its high refractive index. In tandem with optimized heights of the organic layers, the increased light reflectance at the anode side, which includes the TiO2 nanoparticle layer, improved the optical efficiency of the OLED device via the microcavity effect. In order to prove that the enhancement of the optical efficiency was due to an enhanced microcavity effect caused by TiO2 nanoparticles, a microcavity simulation was conducted. The electrical characteristics were not affected by the nanoparticles and a clear pixel image was maintained. The results in this paper show that a nanoparticle based microcavity effect can be exploited to enhance the optical efficiency of OLEDs.
在本文中，与先前报道的方法不同，我们建议利用纳米颗粒的微腔效应来提高有机发光二极管（OLED）的光学效率。借助旋涂制造方法的溶液工艺，将纳米颗粒输入OLED器件的方法简单且具有成本效益。二氧化钛（TiO₂）纳米颗粒因其高折射率而被用于提高反射率。与有机层的优化高度相结合，在包括TiO₂纳米颗粒层的阳极侧增加的光反射率通过微腔效应提高了OLED器件的光学效率。为了证明光学效率的提高是由于TiO₂纳米颗粒引起的微腔效应增强，进行了微腔模拟。纳米颗粒不影响电学特性，并且保持了清晰的像素图像。本文的结果表明，可以利用基于纳米颗粒的微腔效应来提高OLED的光学效率。
