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

Beom Pyo, Chul Woong Joo, Hyung Suk Kim, Byoung Hwa Kwon, Jeong Ik Lee, Jonghee Lee, Min Chul Suh

Research output: Contribution to journalArticlepeer-review

61 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)8575-8582
Number of pages8
JournalNanoscale
Volume8
Issue number16
DOIs
Publication statusPublished - 28 Apr 2016

Bibliographical note

Publisher Copyright:
© The Royal Society of Chemistry 2016.

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