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Open AccessArticle

Effects of Long-Term Static Bending Deformation on a Barrier Thin Film for Flexible Organic Optoelectronic Devices

1
Department of Mechanical Engineering, National Central University, Tao-Yuan 32001, Taiwan
2
Department of Physics, National Chung Cheng University, Chia-Yi 62102, Taiwan
*
Author to whom correspondence should be addressed.
Coatings 2018, 8(4), 127; https://doi.org/10.3390/coatings8040127
Received: 9 March 2018 / Revised: 26 March 2018 / Accepted: 29 March 2018 / Published: 30 March 2018
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Abstract

The objective of this study is to investigate the effect of long-term static bending on the encapsulation properties of a commercial barrier thin film for flexible optoelectronic devices. Encapsulation properties of the barrier film are evaluated under long-term static bending at various radii of curvature. Experimental results reveal that no significantly detrimental effect on the water vapor transmission rate (WVTR) at 40 °C and 90% RH is found for compressive bending up to 1000 h and for tensile bending up to 100 h with a radius of curvature of 5 mm or larger. However, WVTR of the barrier thin film is significantly increased and cracks are found in the barrier film when subjected to tensile bending of a radius of 10 mm or 5 mm for 1000 h. The expected WVTR of the given barrier thin film is numerically computed using a three-dimensional (3D) finite element model. Numerical results indicate that, with the presence of cracks in the barrier thin film, the WVTR increases for an apparent increase in moisture entrances. The WVTR calculated by the 3D cracking model concurs with the experimental results. View Full-Text
Keywords: flexible organic optoelectronic device; barrier thin film; static bending; water vapor transmission rate flexible organic optoelectronic device; barrier thin film; static bending; water vapor transmission rate
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Lu, H.-I.; Tran, D.-P.; Lin, C.-K.; To, B.-D. Effects of Long-Term Static Bending Deformation on a Barrier Thin Film for Flexible Organic Optoelectronic Devices. Coatings 2018, 8, 127.

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