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학술지 Straight-Forward Control of the Degree of Micro-Cavity Effects in Organic Light-Emitting Diodes Based on a Thin Striped Metal Layer
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저자
이종희, 조현수, 고태욱, Simone Hofmann, Yong Hyun Kim, Changhun Yun, Tobias Schwab, Sebastian Reineke, Bjorn Lussem, 이정익, 유승협, Karl Leo, Malte C. Gather
발행일
201310
출처
Organic Electronics, v.14 no.10, pp.2444-2450
ISSN
1566-1199
출판사
Elsevier
DOI
https://dx.doi.org/10.1016/j.orgel.2013.06.008
협약과제
13VB1900, 에너지 절감을 위한 7인치기준 2W급 환경적응 디스플레이 신모드 핵심 원천 기술 개발, 추혜용
초록
We investigated the control of micro-cavity (MC) effects in organic light-emitting diodes (OLEDs) with the introduction of a striped thin metal layer between the indium tin oxide (ITO) layer and the hole transporting layer (HTL). With an enhanced MC effect obtained through the inserted metal layer, the forward emission of the OLED became stronger and the angular distribution became more forward-directed, leading to a current efficiency (CE) that was nearly 1.45 times higher than that of the reference device without the inserted metal layer. The net CE of the OLEDs with a striped metal layer was found to be determined by the area-weighted average of the CE's of full-cavity-enhanced OLEDs and non-cavity OLEDs. It was also observed that the trade-off between resonance enhancement in efficiency and angle-dependent color stability, often found problematic in MC-based OLEDs, could be mitigated in a straight-forward manner by changing the relative portion of the metal-covered area. © 2013 Elsevier B.V.
키워드
Lambertian, Metal cathode, Micro-cavity effect, Organic light-emitting diodes (OLEDs)
KSP 제안 키워드
Angular distribution, Cavity-enhanced, Color stability, Forward control, Hole transporting layer, Metal cathode, Organic light-emitting diodes(OLEDS), Reference device, Trade-off, Weighted average, angle-dependent