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A Nanoporous Polymer Film as a Diffuser as well as a Light Extraction Component for Top Emitting Organic Light Emitting Diodes with a Strong Microcavity Structure
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- Authors
- Beom Pyo, Chul Woong Joo, Hyung Suk Kim, Byoung-Hwa Kwon, Jeong-Ik Lee, Jonghee Lee, Min Chul Suh
- Issue Date
- 2016-04
- Citation
- Nanoscale, v.8, no.16, pp.8575-8582
- ISSN
- 2040-3364
- Publisher
- Royal Society of Chemistry (RSC)
- Language
- English
- Type
- Journal Article
- Abstract
- To improve the viewing angle characteristic as well as the light extraction effect of strong microcavity devices, we fabricated a nanoporous polymer film (NPF) as a scattering medium as well as a light extraction component. We designed two types of organic light emitting diodes (OLEDs) with a strong microcavity effect by changing the thickness of the hole transport layer (HTL; e.g. 30 nm and 60 nm) to investigate two different scattering effects of the NPF. Very interestingly, we could observe a significant enhancement of the external quantum efficiency (EQE) for each device (30 nm thick HTL: 18.0%, 60 nm thick HTL: 31.6%) when we attached a NPF formed on a 125 μm thick PET film coated with the NPF. Furthermore, the NPF successfully suppressed the viewing angle dependence to realize ideal angular emission even in the two extreme microcavity conditions although they are still different from that of a Lambertian distribution.
- KSP Keywords
- Angle dependence, External Quantum Efficiency, Hole transport layer, Microcavity devices, Microcavity effect, Nanoporous polymer, PET film, Polymer films, Scattering effect, Scattering medium, light emitting diodes(LED)