Enhanced outcoupling in flexible organic light-emitting diodes on scattering polyimide substrates
Abstract
We demonstrate an upscalable approach to increase outcoupling in organic light-emitting diodes (OLEDs) fabricated on flexible substrates. The outcoupling enhancement is enabled by introducing a thin film of microporous polyimide on the backside of silver nanowire (AgNW) electrodes embedded in neat colorless polyimide. This porous polyimide film, prepared by immersion precipitation, utilizes a large index contrast between the polyimide host and randomly distributed air voids, resulting in broadband haze (>75%). In addition, the composite polyimide/AgNW scattering substrate inherits the high thermal (>360 °C), chemical, and mechanical stability of polyimides. The outcoupling efficiency of the composite scattering substrate is studied via optical characterization of the composite substrate and electron microscopy of the scattering film. The flexible scattering substrates compared to glass/indium tin oxide (ITO) allows for a 74% enhancement in external quantum efficiency (EQE) for a phosphorescent green OLED, and 68% EQE enhancement for a phosphorescent white OLED. The outcoupling enhancement remains unharmed after 5000 bending cycles at a 2 mm bending radius. Moreover, the color uniformity over viewing angles is improved, an important feature for lighting applications.
- Authors:
-
[1];
- Princeton Univ., NJ (United States). Dept. of Electrical Engineering
- Princeton Univ., NJ (United States). Dept. of Mechanical and Aerospace Engineering. Princeton Inst. for the Science and Technology of Materials (PRISM)
- Princeton Univ., NJ (United States). Dept. of Electrical Engineering. Dept. of Mechanical and Aerospace Engineering. Princeton Inst. for the Science and Technology of Materials (PRISM)
- Princeton Univ., NJ (United States). Dept. of Electrical Engineering. Andlinger Center for Energy and the Environment
- Publication Date:
- Research Org.:
- Princeton Univ., NJ (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Building Technologies Office
- OSTI Identifier:
- 1538698
- Alternate Identifier(s):
- OSTI ID: 1549204
- Grant/Contract Number:
- EE0006672
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Organic Electronics
- Additional Journal Information:
- Journal Volume: 51; Journal ID: ISSN 1566-1199
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING; flexible organic light-emitting diodes; white organic light emitting devices; outcoupling; silver nanowires; colorless polyimide; scattering substrate
Citation Formats
Lee, Kyung Min, Fardel, Romain, Zhao, Lianfeng, Arnold, Craig B., and Rand, Barry P. Enhanced outcoupling in flexible organic light-emitting diodes on scattering polyimide substrates. United States: N. p., 2017.
Web. doi:10.1016/j.orgel.2017.09.042.
Lee, Kyung Min, Fardel, Romain, Zhao, Lianfeng, Arnold, Craig B., & Rand, Barry P. Enhanced outcoupling in flexible organic light-emitting diodes on scattering polyimide substrates. United States. https://doi.org/10.1016/j.orgel.2017.09.042
Lee, Kyung Min, Fardel, Romain, Zhao, Lianfeng, Arnold, Craig B., and Rand, Barry P. Mon .
"Enhanced outcoupling in flexible organic light-emitting diodes on scattering polyimide substrates". United States. https://doi.org/10.1016/j.orgel.2017.09.042. https://www.osti.gov/servlets/purl/1538698.
@article{osti_1538698,
title = {Enhanced outcoupling in flexible organic light-emitting diodes on scattering polyimide substrates},
author = {Lee, Kyung Min and Fardel, Romain and Zhao, Lianfeng and Arnold, Craig B. and Rand, Barry P.},
abstractNote = {We demonstrate an upscalable approach to increase outcoupling in organic light-emitting diodes (OLEDs) fabricated on flexible substrates. The outcoupling enhancement is enabled by introducing a thin film of microporous polyimide on the backside of silver nanowire (AgNW) electrodes embedded in neat colorless polyimide. This porous polyimide film, prepared by immersion precipitation, utilizes a large index contrast between the polyimide host and randomly distributed air voids, resulting in broadband haze (>75%). In addition, the composite polyimide/AgNW scattering substrate inherits the high thermal (>360 °C), chemical, and mechanical stability of polyimides. The outcoupling efficiency of the composite scattering substrate is studied via optical characterization of the composite substrate and electron microscopy of the scattering film. The flexible scattering substrates compared to glass/indium tin oxide (ITO) allows for a 74% enhancement in external quantum efficiency (EQE) for a phosphorescent green OLED, and 68% EQE enhancement for a phosphorescent white OLED. The outcoupling enhancement remains unharmed after 5000 bending cycles at a 2 mm bending radius. Moreover, the color uniformity over viewing angles is improved, an important feature for lighting applications.},
doi = {10.1016/j.orgel.2017.09.042},
journal = {Organic Electronics},
number = ,
volume = 51,
place = {United States},
year = {Mon Sep 25 00:00:00 EDT 2017},
month = {Mon Sep 25 00:00:00 EDT 2017}
}
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Works referencing / citing this record:
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