Enhancement of Light Extraction from Organic Light-Emitting Diodes by SiO2 Nanoparticle-Embedded Phase Separated PAA/PI Polymer Blends

Using the phase separation of a binary immiscible polymer blend of poly(amic acid) and polyimide in combination with SiO 2 nanoparticles, we have designed random nanopore and nanopillar patterns by a simple spin-coating technique. The spontaneously formed pattern structure was investigated by an ato...

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Published inMolecular Crystals and Liquid Crystals Vol. 686; no. 1; pp. 55 - 62
Main Authors Tu, Trang T.K, Han, Joo Won, Kim, Dong Woo, Jeong, Yeun Tae, Gal, Yeong Soon, Bach, Long Giang, Kim, Yong Hyun, Lim, Kwon Taek
Format Journal Article
LanguageEnglish
Published Philadelphia Taylor & Francis 13.06.2019
Taylor & Francis Ltd
Subjects
Atomic force microscopes
Atomic force microscopy
Diodes
light extraction
Nanoparticles
nanopores and nanopillars
Organic light emitting diodes
Phase separation
Poly(amic acid)/Polyimide (PAA/PI)
Polyimide resins
Polymer blends
Polymers
Porosity
Quantum efficiency
Silicon dioxide
Spin coating
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Summary:Using the phase separation of a binary immiscible polymer blend of poly(amic acid) and polyimide in combination with SiO 2 nanoparticles, we have designed random nanopore and nanopillar patterns by a simple spin-coating technique. The spontaneously formed pattern structure was investigated by an atomic force microscope technique, which enhanced the external quantum efficiency of conventional green OLEDs up to a highest factor of 1.42. This enhancement is mainly attributed to the reduction of the total internal reflection at the interface of glass and air by the polymer hybrid layer on the backside of OLED devices. This work provides a new and practical approach to the development of efficient external outcoupling structures for OLEDs.
ISSN:1542-1406
1563-5287
1527-1943
DOI:10.1080/15421406.2019.1648036