title: A randomly nano-structured scattering layer for transparent organic light emitting diodes.
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.
authors.affiliation: OLED Research Center, Electronics and Telecommunications Research Institute, Daejeon 305-700, Korea. jiklee@etri.re.kr.
authors.forename: Jin Woo
authors.initials: JW
authors.lastname: Huh
authors.forename: Jin-Wook
authors.initials: JW
authors.lastname: Shin
authors.forename: Doo-Hee
authors.initials: DH
authors.lastname: Cho
authors.forename: Jaehyun
authors.initials: J
authors.lastname: Moon
authors.forename: Chul Woong
authors.initials: CW
authors.lastname: Joo
authors.forename: Seung Koo
authors.initials: SK
authors.lastname: Park
authors.forename: Joohyun
authors.initials: J
authors.lastname: Hwang
authors.forename: Nam Sung
authors.initials: NS
authors.lastname: Cho
authors.forename: Jonghee
authors.initials: J
authors.lastname: Lee
authors.forename: Jun-Han
authors.initials: JH
authors.lastname: Han
authors.forename: Hye Yong
authors.initials: HY
authors.lastname: Chu
authors.forename: Jeong-Ik
authors.initials: JI
authors.lastname: Lee