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Journal Article
Improvement of Viewing Angle Dependence of the White Organic Light Emitting Diodes with Tandem Structure by Introduction of Nanoporous Polymer Films
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- Authors
- Hyung Suk Kim, Chul Woong Joo, Beom Pyo, Jonghee Lee, Min Chul Suh
- Issue Date
- 2017-01
- Citation
- Organic Electronics, v.40, pp.88-96
- ISSN
- 1566-1199
- Publisher
- Elsevier
- Language
- English
- Type
- Journal Article
- Abstract
- We fabricated nanoporous polymer films (NPFs) with different pore size distribution [e.g., P1 (3000??5000혻nm), P2 (1000??1200혻nm), and P3 (300??500혻nm)] 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 60째). Especially, NPF with 300??500혻nm 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 [?? (u??, v??) of 0.0264] compared to that of WOLED without NPFs [?? (u??, v??) of 0.0558] in Commision Internationale de l?쇒뎑lairage 1976 standards (CIE 1976), which implies such NPFs have great potential as a viewing angle compensation layer for the future.
- KSP Keywords
- Air voids, Angle compensation, Angle dependence, Coating process, Nanoporous polymer, Optical characteristics, Peak wavelength, Polymer films, Pore Size Distribution, Spin coating, Tandem structure