Lensfree OLEDs with over 50% external quantum efficiency via external scattering and horizontally oriented emitters

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High efficiency is important for successful deployment of any light sources. Continued efforts have recently made it possible to demonstrate organic light-emitting diodes with efficiency comparable to that of inorganic light-emitting diodes. However, such achievements were possible only with the help of a macroscopic lens or complex internal nanostructures, both of which undermine the key benefits of organic light-emitting diodes as an affordable planar light source. Here we present a systematic way to achieve organic light-emitting diodes with ultrahigh efficiency even only with an external scattering film, one of the simplest low-cost outcoupling structures. Through a global, multivariable analysis, we show that scattering with a high degree of forwardness has a potential to play a critical role in realizing ultimate efficiency. Combined with horizontally oriented emitters, organic light-emitting diodes equipped with particle-embedded films tailored for forward-intensive scattering achieve a maximum external quantum efficiency of 56%.
Publisher
NATURE PUBLISHING GROUP
Issue Date
2018-08
Language
English
Article Type
Article
Citation

NATURE COMMUNICATIONS, v.9

ISSN
2041-1723
DOI
10.1038/s41467-018-05671-x
URI
http://hdl.handle.net/10203/245403
Appears in Collection
EE-Journal Papers(저널논문)
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