A simple fabrication method for a light extraction layer is required. In this report, an internal light extraction layer composed of a high refractive index material and an air void is fabricated in five steps. A direct printing process followed by annealing of the randomly arrayed poly(benzyl methacrylate) pillars after a planarization process using TiO₂‐nanoparticle dispersed resist and sol is used. These substrates are used for light extraction in white tandem organic light emitting diodes (WOLEDs). By combining the hollow structure and hemi‐spherical lens, WOLEDs without and with the light extraction structures are found to show maximum external quantum efficiencies of 35.6% and 103%, respectively. The power efficiencies at 100 cd m⁻² of the WOLEDs without and with the light extraction structures are found to be 26.5 and 93.2 lm W⁻¹, respectively. A color rendering index of 86.4, correlated color temperature of 4860 K, and CIE of (0.353, 0.389) are achieved in the WOLEDs with light extraction structures.

中文翻译：

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采用空心结构的高效串联白色OLED

需要用于光提取层的简单制造方法。在该报告中，分五个步骤制造了由高折射率材料和气孔组成的内部光提取层。使用直接印刷工艺，然后在使用TiO ₂纳米颗粒分散的抗蚀剂和溶胶进行平面化工艺之后，对随机排列的聚（甲基丙烯酸苄酯）柱进行退火。这些基板用于白色串联有机发光二极管（WOLED）中的光提取。通过结合中空结构和半球形透镜，发现不带光提取结构和带光提取结构的WOLED的最大外部量子效率分别为35.6％和103％。100 cd m ^-2时的功率效率发现没有和具有光提取结构的WOLED的分别为26.5和93.2 lm W ^-1。在具有光提取结构的WOLED中，显色指数为86.4，相关色温为4860 K，CIE为（0.353，0.389）。