Improvement of light extraction in organic light-emitting diodes using a corrugated microcavity

Based on the phase separation effect in the film formation process of Polystyrene and Poly(methyl methacrylate) blend solution, bottom-emitting organic light-emitting diodes (OLEDs) with corrugated microcavity was demonstrated. This device exhibited high efficiency, broad spectra and Lambertian angu...

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Published inOptics express Vol. 23; no. 4; pp. 4055 - 4064
Main Authors Jiao, Bo, Yu, Yue, Dai, Yang, Hou, Xun, Wu, Zhaoxin
Format Journal Article
LanguageEnglish
Published United States 23.02.2015
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Summary:Based on the phase separation effect in the film formation process of Polystyrene and Poly(methyl methacrylate) blend solution, bottom-emitting organic light-emitting diodes (OLEDs) with corrugated microcavity was demonstrated. This device exhibited high efficiency, broad spectra and Lambertian angular emission. Compared with the traditional bottom-emitting OLEDs with ITO anode and the planar microcavity OLEDs, about 57% and 41% enhancement for external quantum efficiency was achieved in this corrugated microcavity OLEDs respectively. This improvement can be understood by the scattering effect of the quasi-periodic characteristic of this corrugated microcavity which reduces the optical loss at surface plasmon polariton modes and wave-guided modes. This work provides a simple as well as efficienct method to recover trapped light in OLEDs, which will benefit the low cost fabrication process.
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ISSN:1094-4087
1094-4087
DOI:10.1364/oe.23.004055