The performance of both organic light-emitting diodes (OLEDs) and organic solar cells (OSC) depends on efficient coupling between optical far field modes and the emitting/absorbing region of the device. Current approaches towards OLEDs with efficient light-extraction often are limited to single-color emission or require expensive, non-standard substrates or top-down structuring, which reduces compatibility with large-area light sources. Here, we report on integrating solution-processed nano-particle based light-scattering films close to the active region of organic semiconductor devices. In OLEDs, these films efficiently extract light that would otherwise remain trapped in the device. Without additional external outcoupling structures, translucent white OLEDs containing these scattering films achieve luminous efficacies of 46 lm W−1 and external quantum efficiencies of 33% (both at 1000 cd m−2). These are by far the highest numbers ever reported for translucent white OLEDs and the best values in the open literature for any white device on a conventional substrate. By applying additional light-extraction structures, 62 lm W−1 and 46% EQE are reached. Besides universally enhancing light-extraction in various OLED configurations, including flexible, translucent, single-color, and white OLEDs, the nano-particle scattering film boosts the short-circuit current density in translucent organic solar cells by up to 70%.
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28 May 2013
Research Article|
May 22 2013
Nano-particle based scattering layers for optical efficiency enhancement of organic light-emitting diodes and organic solar cells
Hong-Wei Chang;
Hong-Wei Chang
1
Institut für Angewandte Photophysik, Technische Universität Dresden
, George-Bähr-Straße 1, 01062 Dresden, Germany
2
Graduate Institute of Electronics Engineering, Graduate Institute of Photonics and Optoelectronics, and Department of Electrical Engineering, National Taiwan University
Taipei 106, Taiwan
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Jonghee Lee;
Jonghee Lee
1
Institut für Angewandte Photophysik, Technische Universität Dresden
, George-Bähr-Straße 1, 01062 Dresden, Germany
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Simone Hofmann;
Simone Hofmann
1
Institut für Angewandte Photophysik, Technische Universität Dresden
, George-Bähr-Straße 1, 01062 Dresden, Germany
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Yong Hyun Kim;
Yong Hyun Kim
1
Institut für Angewandte Photophysik, Technische Universität Dresden
, George-Bähr-Straße 1, 01062 Dresden, Germany
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Lars Müller-Meskamp;
Lars Müller-Meskamp
1
Institut für Angewandte Photophysik, Technische Universität Dresden
, George-Bähr-Straße 1, 01062 Dresden, Germany
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Björn Lüssem;
Björn Lüssem
1
Institut für Angewandte Photophysik, Technische Universität Dresden
, George-Bähr-Straße 1, 01062 Dresden, Germany
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Chung-Chih Wu;
2
Graduate Institute of Electronics Engineering, Graduate Institute of Photonics and Optoelectronics, and Department of Electrical Engineering, National Taiwan University
Taipei 106, Taiwan
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Karl Leo;
1
Institut für Angewandte Photophysik, Technische Universität Dresden
, George-Bähr-Straße 1, 01062 Dresden, Germany
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Malte C. Gather
1
Institut für Angewandte Photophysik, Technische Universität Dresden
, George-Bähr-Straße 1, 01062 Dresden, Germany
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a)
Electronic mail: [email protected].
b)
Electronic mail: [email protected].
c)
Electronic mail: [email protected].
J. Appl. Phys. 113, 204502 (2013)
Article history
Received:
February 25 2013
Accepted:
May 02 2013
Citation
Hong-Wei Chang, Jonghee Lee, Simone Hofmann, Yong Hyun Kim, Lars Müller-Meskamp, Björn Lüssem, Chung-Chih Wu, Karl Leo, Malte C. Gather; Nano-particle based scattering layers for optical efficiency enhancement of organic light-emitting diodes and organic solar cells. J. Appl. Phys. 28 May 2013; 113 (20): 204502. https://doi.org/10.1063/1.4807000
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