Improvement of viewing angle dependence of the white organic light emitting diodes with tandem structure by introduction of nanoporous polymer films

Hyung Suk Kim, Chul Woong Joo, Beom Pyo, Jonghee Lee, Min Chul Suh

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

We fabricated nanoporous polymer films (NPFs) with different pore size distribution [e.g., P1 (3000–5000 nm), P2 (1000–1200 nm), and P3 (300–500 nm)] by using simple spin coating process and utilized those NPFs as a viewing angle compensation layer for white organic light emitting diodes (WOLEDs) with tandem structure. In this research, all NPFs could alleviate serious peak wavelength shift according to the variation of viewing angle (e.g., up to angles of 60°). Especially, NPF with 300–500 nm air voids (P3) showed the best optical characteristic among three types of NPFs when we utilized them for WOLEDs with tandem structure. Indeed, P3 could efficiently reduce the color shift [Δ (u′, v′) of 0.0264] compared to that of WOLED without NPFs [Δ (u′, v′) of 0.0558] in Commision Internationale de l’Éclairage 1976 standards (CIE 1976), which implies such NPFs have great potential as a viewing angle compensation layer for the future.

Original languageEnglish
Pages (from-to)88-96
Number of pages9
JournalOrganic Electronics
Volume40
DOIs
Publication statusPublished - 1 Jan 2017

Bibliographical note

Publisher Copyright:
© 2016 Elsevier B.V.

Keywords

  • Chromaticity angular dependence
  • Diffuser film
  • Nanoporous polymer film
  • Size effect
  • WOLEDs

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