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Suppressing surface plasmon losses to improve the efficiency of blue organic light-emitting diodes using the plasmonic quasi-bandgap phenomenon

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Photonics Research 2021年第9期9卷 1784-1795页

作者： TAE-WOO LEE DOHONG KIM JUN HEE HAN SOMIN LEE HOSEUNG LEE seungyeop choi KYUNG CHEOL choi School of Electrical Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea

It is a persistent problem in organic light-emitting diode(OLED)display devices that the efficiency of blue-light source materials is lower than that of green-or red-light source *** address this problem,numerous studies have investigated blue-light-emitting ***,ensuring the reliability of the blue-light-emitting materials has been difficult in most *** this study,electrodes using asymmetric dielectric/metal/dielectric structures with plasmonic quasi-bandgap characteristics were developed to achieve a highly efficient blue fluorescent *** electrodes were applied in a microcavity OLED and a transparent *** the developed electrode in fabricated OLED devices not only maximized the cavity resonance effect and transparency,but also preserved the advantage of the work function of the metal in terms of electrical properties,with high device *** approach also minimized losses caused by surface plasmon polaritons,which is a blind spot in the optical aspect of metal electrodes,resulting in improved light extraction efficiency.

关键词： light blue surface

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Sandwich-structure transferable free-form OLEDs for wearable and disposable skin wound photomedicine

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Light(Science & Applications) 2019年第1期8卷 96-110页

作者： Yongmin Jeon Hye-Ryung choi Jeong Hyun Kwon seungyeop choi Kyung Mi Nam Kyoung-Chan Park Kyung Cheol choi School of Electrical Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea Department of Dermatology Seoul National University Bundang Hospital(SNUBH)Seongnam 13620Republic of Korea

Free-form optoelectronic devices can provide hyper-connectivity over space and ***,most conformable optoelectronic devices can only be fabricated on flat polymeric materials using low-temperature processes,limiting their application and *** paper presents free-form optoelectronic devices that are not dependent on the shape or *** medical applications,the transferable OLED(10μm)is formed in a sandwich structure with an ultra-thin transferable barrier(4.8μm).The results showed that the fabricated sandwich-structure transferable OLED(STOLED)exhibit the same high-efficiency performance on cylindricalshaped materials and on materials such as textile and *** 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%,*** 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,reepithelialization was highly *** on the results,the STOLED is expected to be applicable in various wearable and disposable photomedical devices.

关键词： optoelectronic structure transfer

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Foldable and washable textile-based OLEDs with a multi-functional near-room-temperature encapsulation layer for smart e-textiles

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npj Flexible Electronics 2021年第1期5卷 123-131页

作者： So Yeong Jeong Hye Rin Shim Yunha Na Ki Suk Kang Yongmin Jeon seungyeop choi Eun Gyo Jeong Yong Cheon Park Ha-Eun Cho Junwoo Lee Jeong Hyun Kwon Sung Gap Im Kyung Cheol choi School of Electrical Engineering Korea Advanced Institute of Science and Technology(KAIST)DaejeonRepublic of Korea Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology(KAIST)DaejeonRepublic of Korea Department of Clothing and Textiles Chonnam National UniversityGwangjuRepublic of Korea Department of Display and Semiconductor Engineering Sun Moon UniversityAsanRepublic of Korea Department of Chemical and Biomolecular Engineering and KI for the NanoCentury Korea Advanced Institute of Science and Technology(KAIST)DaejeonRepublic of Korea.

Wearable electronic devices are being developed because of their wide potential applications and user *** them,wearable organic light emitting diodes(OLEDs)play an important role in visualizing the data signal processed in wearable electronics to *** this study,textile-based OLEDs were fabricated and their practical utility was *** textilebased OLEDs exhibited a stable operating lifetime under ambient conditions,enough mechanical durability to endure the deformation by the movement of humans,and washability for maintaining its optoelectronic properties even in water condition such as rain,sweat,or *** this study,the main technology used to realize this textile-based OLED was multi-functional nearroom-temperature *** outstanding impermeability of TiO_(2)film deposited at near-room-temperature was *** internal residual stress in the encapsulation layer was controlled,and the device was capped by highly crosslinked hydrophobic polymer film,providing a highly impermeable,mechanically flexible,and waterproof encapsulation.

关键词： OLEDs layer film

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Multi-directionally wrinkle-able textile OLEDs for clothing-type displays

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npj Flexible Electronics 2020年第1期4卷 288-296页

作者： seungyeop choi Woosung Jo Yongmin Jeon Seonil Kwon Jeong Hyun Kwon Young Hyun Son Junmo Kim Jun Hong Park Hyuncheol Kim Ho Seung Lee Minwoo Nam Eun Gyo Jeong Jeong Bin Shin Taek-Soo Kim Kyung Cheol choi School of Electrical Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea Department of Mechanical Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea

A clothing-type wearable display can be utilized in fashion,bio-healthcare,and safety industries as well as smart textiles for the internet of things(IoTs)and wearable *** response to this trend,we demonstrate a textile display that can endure the active movements of a human *** can be applied to any kind of textile,and is durable against conditions such as rain,sweat,and *** a key technology for realizing the multi-directional wrinkle-able textile display,we fabricated a stress-lowering textile platform with an ultrathin planarization layer replicated from the flat surface of *** elastomeric strain buffer for reducing mechanical stress is also inserted into the textile ***,organic light-emitting diodes(OLEDs)with red,green and blue color,thin film transistors(TFTs)fabricated at a low temperature below 150℃,and a washable encapsulation layer blocking both gas and liquid were demonstrated on the textile platform.

关键词： OLEDs IoT directional

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