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[International Journal] Sandwich-structure Transferable Free-form OLEDs for Wearable and Disposable Skin Wound Photomedicine
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Yongmin Jeon†, Hye-Ryung Choi†, Jeong Hyun Kwon, Seongyeop Choi, Kyung Mi Nam , Kyoung-Chan Park* and Kyung Cheol Choi*
Light: Science & Applications, December , 2019
Published
vol 8, no 114, pp
Abstract
Free-form optoelectronic devices can provide hyper-connectivity over space and time. However, most conformable optoelectronic devices can only be fabricated on flat polymeric materials using low-temperature processes, limiting their application and forms. This paper presents free-form optoelectronic devices that are not dependent on the shape or material. For medical applications, the transferable OLED (10 μm) is formed in a sandwich structure with an ultra-thin transferable barrier (4.8 μm). The results showed that the fabricated sandwich-structure transferable OLED (STOLED) exhibit the same high-efficiency performance on cylindrical-shaped materials and on materials such as textile and paper. Because the neutral axis is freely adjustable using the sandwich structure, the textile-based OLED achieved both folding reliability and washing reliability, as well as a long operating life (>150 h). When keratinocytes were irradiated with red STOLED light, cell proliferation and cell migration increased by 26 and 32%, respectively. In the skin equivalent model, the epidermis thickness was increased by 39%; additionally, in organ culture, not only was the skin area increased by 14%, but also, re-epithelialization was highly induced. Based on the results, the STOLED is expected to be applicable in various wearable and disposable photomedical devices.
https://doi.org/10.1038/s41377-019-0221-3
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