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A Randomly Nano-structured Scattering Layer for Transparent Organic Light Emitting Diodes
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- Authors
- Jin Woo Huh, Jin-Wook Shin, Doo-Hee Cho, Jaehyun Moon, Chul Woong Joo, Seung Koo Park, Joohyun Hwang, Nam Sung Cho, Jonghee Lee, Jun-Han Han, Hye Yong Chu, Jeong-Ik Lee
- Issue Date
- 2014-10
- Citation
- Nanoscale, v.6, no.18, pp.10727-10733
- ISSN
- 2040-3364
- Publisher
- Royal Society of Chemistry (RSC)
- Language
- English
- Type
- Journal Article
- Abstract
- A random scattering layer (RSL) consisting of a random nano-structure (RNS) and a high refractive index planarization layer (HRI PL) is suggested and demonstrated as an efficient internal light-extracting layer for transparent organic light emitting diodes (TOLEDs). By introducing the RSL, a remarkable enhancement of 40% and 46% in external quantum efficiency (EQE) and luminous efficacy (LE) was achieved without causing deterioration in the transmittance. Additionally, with the use of the RSL, the viewing angle dependency of EL spectra was reduced to a marginal degree. The results were interpreted as the stronger influence of the scattering effect over the microcavity. The RSL can be applied widely in TOLEDs as an effective light-extracting layer for extracting the waveguide mode of confined light at the indium tin oxide (ITO)/OLED stack without introducing spectral changes in TOLEDs. © the Partner Organisations 2014.
- KSP Keywords
- External Quantum Efficiency, High refractive index, Indium Tin Oxide(ITO), Nano-structured, Scattering effect, Scattering layer, Spectral changes, Waveguide mode, light emitting diodes(LED), luminous efficacy, organic light emitting diode(OLED)