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White Organic Light Emitting Diodes with a Random Scattering Layer for an Internal Light Extraction
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- Authors
- Jin-Wook Shin, Jaehyun Moon, Doo-Hee Cho, Chul Woong Joo, Seung Koo Park, Jonghee Lee, Jun-Han Han, Nam Sung Cho, Hyunsu Cho, Jeong-Ik Lee
- Issue Date
- 2016-01
- Citation
- ECS Journal of Solid State Science and Technology, v.5, no.1, pp.R3126-R3130
- ISSN
- 2162-8769
- Publisher
- Electrochemical Society (ECS)
- Language
- English
- Type
- Journal Article
- Abstract
- A random scattering layer (RSL) containing random nano-structures as the internal light extraction functional layer was introduced into white organic light-emitting diodes (OLEDs) to improve the light extraction efficiency and preserve the white color quality. White OLEDs on the RSL with varying heights of nano-structures were successfully fabricated, and the effects of haze on the characteristics of the OLED device were investigated. The haze and light extraction efficiency were mutually proportional. The RSL equipped white OLEDs exhibited an external quantum efficiency improvement of 41.5% with a low angular spectrum change. The results from our RSL are interpreted as an optical functionality which reduces the internal wave guiding mode due to the scattering effect leading to enhanced device efficiency and stabilized emission spectra, respectively.
- KSP Keywords
- Angular spectrum, Device efficiency, Emission spectra, External Quantum Efficiency, Extraction efficiency(EE), Functional layer, Scattering effect, Scattering layer, color quality, efficiency improvement, light emitting diodes(LED)