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Journal Article Fab-compatible Nano-lens Array Integration for Optically Efficient Flexible Top-emitting Organic Light-emitting Diodes
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Authors
Jungyun Kwon, Jehan Kim, Young-Sam Park, Doo-Hee Cho, O Eun Kwon, Kang Me Lee, Hee Chul Lee, Nam Sung Cho, Byounggon Yu
Issue Date
2019-06
Citation
Japanese Journal of Applied Physics, v.58, no.SD, pp.1-6
ISSN
0021-4922
Publisher
Japan Society of Applied Physics (JSAP)
Language
English
Type
Journal Article
DOI
https://dx.doi.org/10.7567/1347-4065/ab0494
Abstract
This work extends the kinds of organic materials that can form nano-lens arrays (NLAs). We have previously addressed fabrication of a N,N??-di(1-naphthyl)-N,N??-diphenyl-(1,1??-biphenyl)-4,4??-diamine (NPB) NLA and explained the formation mechanism as NPB crystallization and the resulting increase in surface tension. Here, we report a Tris(8-hydroxyquinolinato)aluminum (Alq3) NLA fabricated by the same deposition method as a NPB NLA. Grazing-incidence small-angle X-ray scattering experiments indicate that the formation mechanism of the Alq3 NLA is the same as that of the NPB NLA. Furthermore, this study broadens the application of NLAs from rigid to flexible organic light-emitting diodes (OLEDs). Here, flexible stainless steel-based devices using a low-temperature thermal release film, atomic layer deposition and NPB NLA processes are fabricated and characterized. With a NLA, current efficiency is increased 1.4 times, indicating that fab-compatible NLA technology is also available for flexible OLEDs.
KSP Keywords
Atomic Layer Deposition, Deposition method, Organic materials, Scattering experiments, Stainless steel(SUS316), Surface tension(ST), current efficiency, flexible OLED, formation mechanism, grazing incidence small-angle X-ray scattering, lens array