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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
- 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