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In relation to this article, we declare that there is no conflict of interest.
Publication history
Received August 15, 2021
Accepted September 27, 2021
articles This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Moisture-resistant and highly adhesive acrylate-based sealing materials embedded with oxime-based photoinitiators for hermetic optical devices

Department of Chemical Engineering, Soongsil University, Seoul 06978, Korea
Korean Journal of Chemical Engineering, December 2021, 38(12), 2567-2573(7), 10.1007/s11814-021-0962-6
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Abstract

The hermetic sealing of optoelectronic devices has attracted much attention because it can endow the devices with long-term operation reliability and high mechanical resistance. Herein, we present a facile and efficacious strategy for fabrication of water-resistant and highly adhesive acrylate-based sealing materials for hermetic optical devices using oxime-based photoinitiators. Compared with conventional sealing materials containing ketone-based photoinitiator, those embedded with oxime-based photointiators afforded a strong UV absorption in the effective wavelength range, a high UV curing conversion of 99.5% at a low radiant energy of 1.0 J cm-2, a remarkable adhesion strength of 42.2 kgf cm-2, an improved water impermeability of 5.3 g m?2 day-1, and a reduced internal pollution length of 104.9 μm. These excellent properties of the fabricated sealing materials are attributed to the fragmentation mechanism of oxime-based photoinitiators which can generate numerous initiating radicals through multi-step decomposition reactions, resulting in the efficient initiation for photoreaction with acrylate resins. This study provides promising sealing materials based on the oxime-based photoinitiators for ultra-slim and flexible optoelectronic applications.

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