3 February 2009 Weak-microcavity organic light-emitting diodes with improved light-extraction and wide viewing-angle
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We propose and demonstrate weak-microcavity organic light-emitting diode (OLED) displays that deliver both a high light-extraction efficiency and wide 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 (WMOLEDs) are enhanced by 56%, 107%, and 26%, respectively with minimal changes viewing angle and EL spectra characteristics. The color purity is also improved for all three colors. Moreover, we fabricated full-color 128×160 passive-matrix bottom-emitting WMOLED displays to prove their manufacturability. This design is realized by simple one-step 20-nm etching of the low-index layer of red/green subpixels. The EL efficiency of white color in the WMOLED display is 27% higher than that of a conventional OLED display.
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Sang-Hwan Cho, Sang-Hwan Cho, Yong-Hee Lee, Yong-Hee Lee, Young-Woo Song, Young-Woo Song, Yoon-Chang Kim, Yoon-Chang Kim, Joon-Gu Lee, Joon-Gu Lee, Jong Hyuk Lee, Jong Hyuk Lee, Kyu Hwan Hwang, Kyu Hwan Hwang, Dong-Sik Zang, Dong-Sik Zang, } "Weak-microcavity organic light-emitting diodes with improved light-extraction and wide viewing-angle", Proc. SPIE 7231, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XIII, 72311H (3 February 2009); doi: 10.1117/12.810978; https://doi.org/10.1117/12.810978

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