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High efficiency organic light-emitting display using selective spectral photo-recycling

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Abstract

Here, we introduce a selective photo-recycling scheme for organic light-emitting diode (OLED) displays. The conventional photo-recycling method, which uses a recycling film named DBEF, diminishes the ambient contrast ratio of the OLED display, so it is not suitable for display applications. The selective recycling scheme, which uses a cholesteric liquid crystal (CLC) layer that recycles light only in a specific spectral range, can minimize the deterioration of the ambient contrast ratio while improving the photo-efficiency. We found that the aperture ratio of the OLED display influences the recycling efficiency significantly, and that a thin CLC layer diminishes the ambient contrast ratio less than a thick CLC layer while it still recycles the emitted light. By recycling the blue spectral range, one can improve the lifetime of blue OLE material, which has the shortest lifetime, or reduce the size of the blue pixel, which has the largest size among red, green, and blue pixels.

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Authors and Affiliations

  1. School of Information & Communication Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do, 440-746, Republic of Korea

    Eunjung Lee & Jang-Kun Song

  2. Samsung Display Co. Ltd., Cheon-An City, Chungcheongnam-do, Republic of Korea

    Eunjung Lee

Authors
  1. Eunjung Lee
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  2. Jang-Kun Song
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Correspondence to Jang-Kun Song.

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Lee, E., Song, JK. High efficiency organic light-emitting display using selective spectral photo-recycling. Appl. Phys. A 109, 431–436 (2012). https://doi.org/10.1007/s00339-012-7042-z

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  • DOI: https://doi.org/10.1007/s00339-012-7042-z

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