Effect of Refractive Index Contrast on Out-Coupling Efficiency of Corrugated OLEDs using Low-Refractive-Index LiF Interlayer

Title
Effect of Refractive Index Contrast on Out-Coupling Efficiency of Corrugated OLEDs using Low-Refractive-Index LiF Interlayer
Authors
유형근윤우람이재웅김도영
Keywords
OLED; photonic band gap; light extraction
Issue Date
2020-07
Publisher
ACS Applied Electronic Materials
Citation
VOL 2, NO 7-2223
Abstract
In organic light-emitting diodes (OLEDs), the low out-coupling efficiency of 20?30% limits the external quantum efficiency (EQE). Corrugated structures for OLED light extraction can increase the out-coupling efficiency by extracting the thin-film-guided mode as well as the surface plasmon (SP) mode. To further enhance the out-coupling efficiency of a corrugated OLED, we increase the refractive index contrast by incorporating a low-index light out-coupling layer in the device and the resulting OLED has an external quantum efficiency of 67%. By fabricating these corrugated OLEDs with the emitting layer located at the first and second antinode positions, we confirm that the enhanced extraction comes from the enhanced extraction of thin-film-guided modes.
URI
http://pubs.kist.re.kr/handle/201004/72540
ISSN
2637-6113
Appears in Collections:
KIST Publication > Article
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