Enhanced light extraction from organic light-emitting devices through non-covalent or covalent polyimide-silica light scattering hybrid films

In this work, two polyimide/silica composites were prepared via physical blending ( A series) and chemical bonding ( B series) and compared for light extraction from organic light-emitting devices (OLEDs). In the physical blending process, the hybrids were prepared from the corresponding poly(amic a...

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Bibliographic Details
Published in:Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2020-03, Vol.8 (12), p.412-4111
Main Authors: Yen, Jui-Hua, Wang, Yi-Jyun, Hsieh, Chung-An, Chen, Yung-Chung, Chen, Li-Yin
Format: Article
Language:English
Subjects:
Aminopropyltriethoxysilane
Blending
Chemical bonds
Coupling agents
Devices
Haze
Light
Light scattering
Optical properties
Organic light emitting diodes
Quantum efficiency
Silicon dioxide
Sol-gel processes
Substrates
Thermal stability
Weight loss
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Summary:In this work, two polyimide/silica composites were prepared via physical blending ( A series) and chemical bonding ( B series) and compared for light extraction from organic light-emitting devices (OLEDs). In the physical blending process, the hybrids were prepared from the corresponding poly(amic acid) (PAA) and tetramethyl orthosilicate (TMOS) by thermal imidization and sol-gel processes. In contrast, in the chemical bonding process, a series of hybrids were prepared using (3-aminopropyl)triethoxysilane (APTES) as a coupling agent followed by sol-gel and thermal imidization processes. Their optical, thermal, and morphological properties were investigated. The well-dispersed B series hybrid films showed higher optical transparency and lower haze characteristics than A series hybrid films. Furthermore, the scattering behavior was apparent as the silica content increased. They also exhibited high thermal stability with T d (5% weight loss temperature) higher than 510 °C. Finally, these hybrid films were applied into OLEDs. The external quantum efficiency (EQE) of all devices employing the hybrid films on the viewer's side of the substrate as the outcoupling layer increased as the silica content increased. For the OLED utilizing A3 (26 wt% of silica content), an increase of 21% in the light extraction efficiency was achieved. In this work, two polyimide/silica composites were prepared via physical blending ( A series) and chemical bonding ( B series) and compared for light extraction from organic light-emitting devices (OLEDs).
ISSN:2050-7526
2050-7534
DOI:10.1039/c9tc06449d