Enhanced light extraction efficiency and viewing angle characteristics of microcavity OLEDs by using a diffusion layer

Abstract The viewing angle characteristics and light extraction efficiency of organic light-emitting diodes (OLEDs) with a micro-cavity structure were enhanced. This was accomplished by inserting a diffusion layer composed of nano-sized structures of a transparent polymer poly(methyl methacrylate) (...

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Autores principales:	Cheol Hwee Park, Shin Woo Kang, Sun-Gyu Jung, Dong Jun Lee, Young Wook Park, Byeong-Kwon Ju
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/6a8c4ea603d441f29f6616b8449650a0
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spelling	oai:doaj.org-article:6a8c4ea603d441f29f6616b8449650a02021-12-02T14:26:47ZEnhanced light extraction efficiency and viewing angle characteristics of microcavity OLEDs by using a diffusion layer10.1038/s41598-021-82753-92045-2322https://doaj.org/article/6a8c4ea603d441f29f6616b8449650a02021-02-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-82753-9https://doaj.org/toc/2045-2322Abstract The viewing angle characteristics and light extraction efficiency of organic light-emitting diodes (OLEDs) with a micro-cavity structure were enhanced. This was accomplished by inserting a diffusion layer composed of nano-sized structures of a transparent polymer poly(methyl methacrylate) (PMMA) combined with a zinc oxide (ZnO) semi-planarization layer with a high refractive index (n = 2.1) into the devices. The PMMA nanostructures were fabricated by employing a reactive ion etching (RIE) process. The height and density of the PMMA nanostructures were controlled by varying the speed at which the PMMA was spin-coated onto the substrate. The insertion of the diffusion layer into the micro-cavity OLEDs (MC-OLEDs) improved the external quantum efficiency (EQE) by as much as 17% when compared to that of a MC-OLED without a diffusion layer. Furthermore, adjustment of the viewing angle from 0° to 60° halved the peak shift distance of the electroluminescence (EL) spectra from 42 to 20 nm. Additionally, changing the viewing angle from 0° to 60° changed the color coordinate movement distance of the MC-OLED with the diffusion layer to 0.078, less than half of the distance of the MC-OLED without the diffusion layer (0.165).Cheol Hwee ParkShin Woo KangSun-Gyu JungDong Jun LeeYoung Wook ParkByeong-Kwon JuNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Cheol Hwee Park Shin Woo Kang Sun-Gyu Jung Dong Jun Lee Young Wook Park Byeong-Kwon Ju Enhanced light extraction efficiency and viewing angle characteristics of microcavity OLEDs by using a diffusion layer
description	Abstract The viewing angle characteristics and light extraction efficiency of organic light-emitting diodes (OLEDs) with a micro-cavity structure were enhanced. This was accomplished by inserting a diffusion layer composed of nano-sized structures of a transparent polymer poly(methyl methacrylate) (PMMA) combined with a zinc oxide (ZnO) semi-planarization layer with a high refractive index (n = 2.1) into the devices. The PMMA nanostructures were fabricated by employing a reactive ion etching (RIE) process. The height and density of the PMMA nanostructures were controlled by varying the speed at which the PMMA was spin-coated onto the substrate. The insertion of the diffusion layer into the micro-cavity OLEDs (MC-OLEDs) improved the external quantum efficiency (EQE) by as much as 17% when compared to that of a MC-OLED without a diffusion layer. Furthermore, adjustment of the viewing angle from 0° to 60° halved the peak shift distance of the electroluminescence (EL) spectra from 42 to 20 nm. Additionally, changing the viewing angle from 0° to 60° changed the color coordinate movement distance of the MC-OLED with the diffusion layer to 0.078, less than half of the distance of the MC-OLED without the diffusion layer (0.165).
format	article
author	Cheol Hwee Park Shin Woo Kang Sun-Gyu Jung Dong Jun Lee Young Wook Park Byeong-Kwon Ju
author_facet	Cheol Hwee Park Shin Woo Kang Sun-Gyu Jung Dong Jun Lee Young Wook Park Byeong-Kwon Ju
author_sort	Cheol Hwee Park
title	Enhanced light extraction efficiency and viewing angle characteristics of microcavity OLEDs by using a diffusion layer
title_short	Enhanced light extraction efficiency and viewing angle characteristics of microcavity OLEDs by using a diffusion layer
title_full	Enhanced light extraction efficiency and viewing angle characteristics of microcavity OLEDs by using a diffusion layer
title_fullStr	Enhanced light extraction efficiency and viewing angle characteristics of microcavity OLEDs by using a diffusion layer
title_full_unstemmed	Enhanced light extraction efficiency and viewing angle characteristics of microcavity OLEDs by using a diffusion layer
title_sort	enhanced light extraction efficiency and viewing angle characteristics of microcavity oleds by using a diffusion layer
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/6a8c4ea603d441f29f6616b8449650a0
work_keys_str_mv	AT cheolhweepark enhancedlightextractionefficiencyandviewinganglecharacteristicsofmicrocavityoledsbyusingadiffusionlayer AT shinwookang enhancedlightextractionefficiencyandviewinganglecharacteristicsofmicrocavityoledsbyusingadiffusionlayer AT sungyujung enhancedlightextractionefficiencyandviewinganglecharacteristicsofmicrocavityoledsbyusingadiffusionlayer AT dongjunlee enhancedlightextractionefficiencyandviewinganglecharacteristicsofmicrocavityoledsbyusingadiffusionlayer AT youngwookpark enhancedlightextractionefficiencyandviewinganglecharacteristicsofmicrocavityoledsbyusingadiffusionlayer AT byeongkwonju enhancedlightextractionefficiencyandviewinganglecharacteristicsofmicrocavityoledsbyusingadiffusionlayer
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Enhanced light extraction efficiency and viewing angle characteristics of microcavity OLEDs by using a diffusion layer

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