Enhanced light extraction efficiency and viewing angle characteristics of microcavity OLEDs by using a diffusion layer
- Authors
- Park, Cheol Hwee; Kang, Shin Woo; Jung, Sun-Gyu; Lee, Dong Jun; Park, Young Wook; Ju, Byeong-Kwon
- Issue Date
- 9-2월-2021
- Publisher
- NATURE PORTFOLIO
- Citation
- SCIENTIFIC REPORTS, v.11, no.1
- Indexed
- SCIE
SCOPUS
- Journal Title
- SCIENTIFIC REPORTS
- Volume
- 11
- Number
- 1
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/137780
- DOI
- 10.1038/s41598-021-82753-9
- ISSN
- 2045-2322
- Abstract
- The viewing angle characteristics and light extraction efficiency of organic light-emitting diodes (OLEDs) with a micro-cavity structure were enhanced. This was accomplished by inserting a diffusion layer composed of nano-sized structures of a transparent polymer poly(methyl methacrylate) (PMMA) combined with a zinc oxide (ZnO) semi-planarization layer with a high refractive index (n=2.1) into the devices. The PMMA nanostructures were fabricated by employing a reactive ion etching (RIE) process. The height and density of the PMMA nanostructures were controlled by varying the speed at which the PMMA was spin-coated onto the substrate. The insertion of the diffusion layer into the micro-cavity OLEDs (MC-OLEDs) improved the external quantum efficiency (EQE) by as much as 17% when compared to that of a MC-OLED without a diffusion layer. Furthermore, adjustment of the viewing angle from 0 degrees to 60 degrees halved the peak shift distance of the electroluminescence (EL) spectra from 42 to 20 nm. Additionally, changing the viewing angle from 0 degrees to 60 degrees changed the color coordinate movement distance of the MC-OLED with the diffusion layer to 0.078, less than half of the distance of the MC-OLED without the diffusion layer (0.165).
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Collections - College of Engineering > School of Electrical Engineering > 1. Journal Articles
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