Manipulation of blue TADF top-emission OLEDs by the first-order optical cavity design: toward a highly pure blue emission and balanced charge transport
- Authors
- Ren, Wanqi; Son, Kyung Rock; Park, Tae Hoon; Murugadoss, Vignesh; Kim, Tae Geun
- Issue Date
- 1-8월-2021
- Publisher
- CHINESE LASER PRESS
- Citation
- PHOTONICS RESEARCH, v.9, no.8, pp.1502 - 1512
- Indexed
- SCIE
SCOPUS
- Journal Title
- PHOTONICS RESEARCH
- Volume
- 9
- Number
- 8
- Start Page
- 1502
- End Page
- 1512
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/136882
- DOI
- 10.1364/PRJ.432042
- ISSN
- 2327-9125
- Abstract
- The broad luminescence spectrum of a thermally activated delayed fluorescence (TADF) organic light-emitting diode (OLED) is a critical issue to overcome for its application in high-color-purity displays. Herein, a novel device structure that utilizes the first-order microcavity optical mode with a high radiance intensity is demonstrated to solve this problem by considering the charge transport properties through the analysis of hole-only and electron-only devices. In addition, by tuning the optical interference near the semitransparent top cathode layers consisting of thin silver and organic capping layers, light extraction is increased by nearly 2 times compared to the device without a capping layer. Consequently, the optimized blue TADF top-emission OLED exhibits much lower full width at half-maximum, higher maximum current efficiency, and external quantum efficiency compared to the device before optimization. This approach is expected to provide a simple but effective way to further enhance the spectral purity of the conventional TADF-based OLEDs. (C) 2021 Chinese Laser Press
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Collections - College of Engineering > School of Electrical Engineering > 1. Journal Articles
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