Green phosphorescent organic light-emitting diode exhibiting highest external quantum efficiency with ultra-thin undoped emission layer
- Authors
- Kang, Shin Woo; Baek, Dong-Hyun; Ju, Byeong-Kwon; Park, Young Wook
- Issue Date
- 19-4월-2021
- Publisher
- NATURE RESEARCH
- 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/137450
- DOI
- 10.1038/s41598-021-86333-9
- ISSN
- 2045-2322
- Abstract
- In this study, we report highly efficient green phosphorescent organic light-emitting diodes (OLEDs) with ultra-thin emission layers (EMLs). We use tris[2-phenylpyridinato-C2,N]iridium(III) (Ir(ppy)(3)), a green phosphorescent dopant, for creating the OLEDs. Under systematic analysis, the peak external quantum efficiency (EQE) of an optimized device based on the ultra-thin EML structure is found to be approximately 24%. This result is highest EQE among ultra-thin EML OLEDs and comparable to the highest efficiency achieved by OLEDs using Ir(ppy)(3) that are fabricated via conventional doping methods. Moreover, this result shows that OLEDs with ultra-thin EML structures can achieve ultra-high efficiency.
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