Weak-microcavity organic light-emitting diodes with improved light out-coupling

Sang-Hwan Cho, Young-Woo Song, Joon-gu Lee, Yoon-Chang Kim, Jong Hyuk Lee, Jaeheung Ha, Jong-Suk Oh, So Young Lee, Sun Young Lee, Kyu Hwan Hwang, Dong-Sik Zang, Yong-Hee Lee
Optics Express 2008 August 18, 16 (17): 12632-9
We propose and demonstrate weak-microcavity organic light-emitting diode (OLED) displays with improved light-extraction and viewing-angle characteristics. A single pair of low- and high-index layers is inserted between indium tin oxide (ITO) and a glass substrate. The electroluminescent (EL) efficiencies of discrete red, green, and blue weak-microcavity OLEDs are enhanced by 56%, 107%, and 26%, respectively, with improved color purity. Moreover, full-color passive-matrix bottom-emitting OLED displays are fabricated by employing low-index layers of two thicknesses. As a display, the EL efficiency of white color was 27% higher than that of a conventional OLED display.

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