Highly Efficient and Reliable Organic Light-Emitting Diodes Enabled by a Multifunctional Hazy Substrate for Extreme Environments

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As transparent, flexible, and wearable organic electronics degrade under normal outdoor environmental conditions (e.g., water vapor, oxygen, and UV light) and extreme environments, including washing or rain, a customized encapsulation technology is required to improve device reliability. Herein, a simple process is presented for fabricating multifunctional hazy substrates (MFHSs) with excellent gas diffusion barrier (GDB), flexibility, UV reflectance, light scattering, and waterproof properties. First, a spiky polyethylene terephthalate (PET) surface is produced with 76.0% optical haze through ion-beam treatment followed by the formation of a hydrophobic layer to achieve a waterproof effect (contact angle: 153.3 degrees). Then, a multifunctional multibarrier film is fabricated based on a nano-laminated distributed Bragg reflector and functional polymer on the functional PET substrate to serve as a GDB and UV filter. This multibarrier film has excellent mechanical and chemical stabilities, in addition to having a water vapor transmission rate of 10(-6) g m(-2) day(-1) and UV transmittance of <3%. The so-fabricated MFHS not only increases the device efficiency by 73% but also enables a highly flexible and environmentally stable organic light-emitting diode. The surface treatment and encapsulation technologies developed in this study are expected to increase the lifetime of organic devices and facilitate high outdoor usability.
Publisher
WILEY-V C H VERLAG GMBH
Issue Date
2024-05
Language
English
Article Type
Article; Early Access
Citation

ADVANCED FUNCTIONAL MATERIALS, v.34, no.18

ISSN
1616-301X
DOI
10.1002/adfm.202310268
URI
http://hdl.handle.net/10203/322639
Appears in Collection
ME-Journal Papers(저널논문)
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