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Highly efficient transparent white organic light emitting diodes with nano-structured substrate for light extraction
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- Authors
- Chul Woong Joo, Jin-Wook Shin, Jaehyun Moon, Doo-Hee Cho, Jonghee Lee, Seung Koo Park, Nam Sung Cho, Jun-Han Han, Woo-Jin Sung, Hye Yong Chu, Jeong-Ik Lee
- Issue Date
- 2014-09
- Citation
- International Conference on Electroluminescence and Optoelectronic Devices (ICEL) 2014, pp.154-154
- Language
- English
- Type
- Conference Paper
- Abstract
- White transparent organic light emitting diodes (TOLEDs) have shown rapid progress due to their potential as low-cost and high efficiency light sources for both flat panel display and lighting applications. In particular, TOLEDs can emit light from both the bottom and top sides have attracted a much attention in recent years due to their unique aspects 1-2 . Thanks to the development in phosphorescent materials the internal quantum efficiencies of OLEDs are close to 100%. However, due the presence of intrinsic light loss modes, it is very difficult to achieve an OLED out-coupling efficiency higher than 20%. In order to enhance the efficiency light extraction (LE) technologies are frequently employed. They are mainly achieved by introducing structures which can diminish light loss modes. In this work we present random scattering layer (RSL) as a light extraction structure for TOLEDs. The two features of RSL merits as a LE structure. First, the RSL can scatter light without wavelength dependency and enhance the efficiency. Second, the RSL has an effect of suppressing the microcavity effect, enabling spectral stability.
- KSP Keywords
- Extraction structure, Flat panel display, Highly efficient, Light source, Low-cost, Microcavity effect, Nano-structured, Phosphorescent materials, Scattering layer, Spectral stability, high efficiency