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Enhanced Light Extraction from Organic Light-Emitting Diodes with Micro-Nano Hybrid Structureopen access

Authors
Bae, Eun-JeongKang, Shin-WooChoi, Geun-SuJang, Eun-BiBaek, Dong-HyunJu, Byeong-KwonPark, Young-Wook
Issue Date
4월-2022
Publisher
MDPI
Keywords
organic light-emitting diodes; light extraction; reactive ion etching; mico-nano hybrid structure
Citation
NANOMATERIALS, v.12, no.8
Indexed
SCIE
SCOPUS
Journal Title
NANOMATERIALS
Volume
12
Number
8
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/141858
DOI
10.3390/nano12081266
ISSN
2079-4991
Abstract
In this study, an external light extraction layer with a micro-nano hybrid structure was applied to improve the external light extraction efficiency of organic light-emitting diodes (OLEDs). A reactive ion-etching (RIE) process, using O-2 and CHF3 plasma, was performed on the surface of the micro-scale pattern to form micro-nano hybrid structures. According to the results of this study, the nanostructures formed by the treatment of O-2 and CHF3 were different, and the efficiency according to the structures was analyzed experimentally and theoretically. As a result, the OLED, to which the micro-nano hybrid structure, manufactured through a simple process, is applied, improved the external light extraction efficiency by up to 38%, and an extended viewing angle profile was obtained. Additionally, an effective method for enhancing the out-coupling efficiency of OLEDs was presented by optimizing the micro-nano hybrid structure according to process conditions.
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