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

Jinouk Song, Kwon-Hyeon Kim, Eunhye Kim, Chang-Ki Moon, Yun-Hi Kim, Jang-Joo Kim () and Seunghyup Yoo ()
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Jinouk Song: Korea Advanced Institute of Science and Technology (KAIST)
Kwon-Hyeon Kim: Seoul National University
Eunhye Kim: Korea Advanced Institute of Science and Technology (KAIST)
Chang-Ki Moon: Seoul National University
Yun-Hi Kim: Gyeongsang National University
Jang-Joo Kim: Seoul National University
Seunghyup Yoo: Korea Advanced Institute of Science and Technology (KAIST)

Nature Communications, 2018, vol. 9, issue 1, 1-10

Abstract: Abstract 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%.

Date: 2018
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DOI: 10.1038/s41467-018-05671-x

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