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A Simple Method for Fabricating an External Light Extraction Composite Layer with RNS to Improve the Optical Properties of OLEDsopen access

Authors
Choi, Geun-SuKang, Shin-WooBae, Eun-JeongJang, Eun-BiBaek, Dong-HyunJu, Byeong-KwonPark, Young-Wook
Issue Date
5월-2022
Publisher
MDPI
Keywords
organic light-emitting diodes; reactive ion etching; random nanostructure; nanoparticle; scattering effect; external light extraction
Citation
NANOMATERIALS, v.12, no.9
Indexed
SCIE
SCOPUS
Journal Title
NANOMATERIALS
Volume
12
Number
9
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/143073
DOI
10.3390/nano12091430
ISSN
2079-4991
Abstract
In this study, we fabricated a random nanostructure (RNS) external light extraction composite layer containing high-refractive-index nanoparticles through a simple and inexpensive solution process and a low-temperature mask-free process. We focused on varying the shape and density of the RNSs and adjusted the concentration of the high-refractive-index nanoparticles to control the optical properties. The RNSs fabricated using a low-temperature mask-free process can use the distance between the nanostructures and various forms to control the diffraction and scattering effects in the visible light wavelength range. Consequently, our film exhibited a direct transmittance of similar to 85% at a wavelength of 550 nm. Furthermore, when the RNSs' composite film, manufactured using the low-temperature mask-free process, was applied to organic light-emitting diodes (OLEDs), it exhibited an external quantum efficiency improvement of 32.2% compared with the OLEDs without the RNSs. Therefore, the randomly distributed high-refractive-index nanoparticles on the polymer film can reduce the waveguide mode and total reflection at the substrate/air interface. These films can be used as a scattering layer to reduce the loss of the OLED substrate mode.
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공과대학 (전기전자공학부)
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