Recent Advances in Structural Design of Efficient Near-Infrared Light-Emitting Organic Small Molecules |
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Authors: | Hae Un Kim Taehyun Kim Chanhyuk Kim Minjun Kim Taiho Park |
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Affiliation: | 1. Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk, 37673 Republic of Korea;2. Mobile Display Business, Samsung Display Co., Ltd., 1, Samsung-ro, Giheung-gu, Yongin-si, Gyeonggi-do, 17113 Republic of Korea |
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Abstract: | Organic light-emitting materials in the near-infrared (NIR) region are important to realize next-generation lightweight and wearable applications in bioimaging, photodynamic therapy, and telecommunications. Inorganic and organometallic light-emitting materials are expensive and toxic; thus, the development of purely organic light-emitting materials is essential. However, the development of highly efficient NIR light-emitting materials made of organic materials is still in its infancy. Therefore, this review outlines molecular design strategies for developing organic small-molecule NIR light-emitting materials with high emission efficiency that can overcome the energy-gap law to be applied to next-generation wearable devices. After briefly reviewing the basic knowledge required for the NIR emission of organic molecules, representative high-efficiency molecules reported over the past 5 years are classified according to their core moieties, and their molecular design, physical properties, and luminescence characteristics are analyzed. Further, the perspective and outlook regarding the development of next-generation high-efficiency NIR organic light-emitting materials are provided. |
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Keywords: | molecular designs near-infrared organic light-emitting diodes |
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