Highly Efficient Tandem White OLED Using a Hollow Structure
- Authors
- Han, Kyung-Hoon; Kim, Kwan; Han, Yoonjay; Kim, Yang-Doo; Lim, Hyoungcheol; Huh, Daihong; Shin, Hyun; Lee, Heon; Kim, Jang-Joo
- Issue Date
- 5월-2020
- Publisher
- WILEY
- Keywords
- high refractive index; light extraction efficiency; light scattering layers; nanoimprint lithography; organic light emitting diodes
- Citation
- ADVANCED MATERIALS INTERFACES, v.7, no.9
- Indexed
- SCIE
SCOPUS
- Journal Title
- ADVANCED MATERIALS INTERFACES
- Volume
- 7
- Number
- 9
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/56183
- DOI
- 10.1002/admi.201901509
- ISSN
- 2196-7350
- Abstract
- A simple fabrication method for a light extraction layer is required. In this report, an internal light extraction layer composed of a high refractive index material and an air void is fabricated in five steps. A direct printing process followed by annealing of the randomly arrayed poly(benzyl methacrylate) pillars after a planarization process using TiO2-nanoparticle dispersed resist and sol is used. These substrates are used for light extraction in white tandem organic light emitting diodes (WOLEDs). By combining the hollow structure and hemi-spherical lens, WOLEDs without and with the light extraction structures are found to show maximum external quantum efficiencies of 35.6% and 103%, respectively. The power efficiencies at 100 cd m(-2) of the WOLEDs without and with the light extraction structures are found to be 26.5 and 93.2 lm W-1, respectively. A color rendering index of 86.4, correlated color temperature of 4860 K, and CIE of (0.353, 0.389) are achieved in the WOLEDs with light extraction structures.
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Collections - College of Engineering > Department of Materials Science and Engineering > 1. Journal Articles
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