상세정보
학술지
Organic Wrinkles Embedded in High-index Medium as Planar Internal Scattering Structures for Organic Light-emitting Diodes
- 발행일
- 201707
- 출처
- Organic Electronics, v.46, pp.139-144
- ISSN
- 1566-1199
- 출판사
- Elsevier
- 초록
- 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 제안 키워드
- Ball lens, Control device, External Quantum Efficiency, External surface, High index, Microlens array, Optical simulation, Organic light-emitting diodes(OLEDS), Scattering layer, Solution-processed, Spectral distortion