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

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) com...

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Published in:Scientific reports 2021-02, Vol.11 (1), p.3430-10, Article 3430
Main Authors: Park, Cheol Hwee, Kang, Shin Woo, Jung, Sun-Gyu, Lee, Dong Jun, Park, Young Wook, Ju, Byeong-Kwon
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description 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).
doi_str_mv 10.1038/s41598-021-82753-9
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subjects 639/166/987
639/624/1020/1091
639/624/399/1098
639/766/1130/2799
Diffusion
Efficiency
Etching
Humanities and Social Sciences
multidisciplinary
Polymers
Polymethylmethacrylate
Science
Science (multidisciplinary)
Zinc oxide
Zinc oxides
title Enhanced light extraction efficiency and viewing angle characteristics of microcavity OLEDs by using a diffusion layer
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