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Journal Article
Organic Wrinkles Embedded in High-index Medium as Planar Internal Scattering Structures for Organic Light-emitting Diodes
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- Authors
- Hyunsu Cho, Eunhye Kim, Jaehyun Moon, Chul Woong Joo, Eungjun Kim, Seung Koo Park, Jonghee Lee, Byoung-Gon Yu, Jeong-Ik Lee, Seunghyup Yoo, Nam Sung Cho
- Issue Date
- 2017-07
- Citation
- Organic Electronics, v.46, pp.139-144
- ISSN
- 1566-1199
- Publisher
- Elsevier
- Language
- English
- Type
- Journal Article
- Abstract
- Organic wrinkle structures are investigated as an internal scattering layer for the fabrication of highly efficient organic light-emitting diodes (OLEDs). The solution-processed wrinkle structures are planarized with a high-index layer, resulting in a reduced surface roughness and optical haze simultaneously. The OLED device including the wrinkle structures achieved external quantum efficiency (EQE) of 24.2%, corresponding to a 1.24 time enhancement with respect to that of a control device having no internal scattering layer. By attaching a micro lens array (MLA) or a half ball lens (HBL) on the external surface of the substrate, the proposed device exhibits an EQE of 30.5% (1.56 time enhancement) and 41.8% (2.14 time enhancement), respectively. Randomness of the distributed wrinkle structures is shown to provide additional benefits of reduced angular spectral distortion and Lambertian-like emission properties. Trans-scale optical simulation combining wave-optics and the geometrical effect are used for the quantitative analysis of the emission characteristics of the device.
- KSP Keywords
- Ball lens, Control device, Emission properties, External Quantum Efficiency, External surface, Geometrical effect, Highly efficient, Microlens array, Optical simulation, Quantitative analysis, Scattering layer