A facile method to enhance out-coupling efficiency in organic light-emitting diodes via a random-pyramids textured layer

作者：Zhu, Wenqing^*; Xiao, Teng; Zhai, Guangsheng; Yu, Jingting; Shi, Guanjie; Chen, Guo; Wei, Bin

来源：Journal of Physics D: Applied Physics , 2016, 49(38): 385103.

DOI：10.1088/0022-3727/49/38/385103

• organic light-emitting diodes
• light extraction
• imprint lithography
• random pyramids texture

We demonstrate a facile method to enhance light extraction in organic light-emitting diodes using a polymer layer with a texture consisting of random upright pyramids. The simple fabrication technique of the textured layer is based on silicon alkali-etching and imprint lithography. With the textured layer applied to the external face of the glass substrate, the organic light-emitting diode achieved a 26% enhancement of current efficiency and a 30% enhancement of power efficiency without spectral distortion over wide viewing angles. A ray-tracing optical simulation reveals that the textured layer can alter the traveling path of light and assist in out-coupling a large portion of light delivered into the substrate. The proposed method is a promising approach for achieving enhanced efficiency organic light-emitting diodes for the simple fabrication process and the effective light extraction.

• 出版日期2016-9-28
• 单位上海大学