Long-Lived Room-Temperature Phosphorescent Nitrogen-Doped CQDs/PVA Composites: Fabrication, Characterization and Application
Long-Lived Room-Temperature Phosphorescent Nitrogen-Doped CQDs/PVA Composites: Fabrication, Characterization and Application
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DOI：
10.30919/es8d785
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发表时间：
2018-11
期刊：
影响因子：
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通讯作者：
Xueyun Wu;Wei Li;Pengchao Wu;Chunhui Ma;Yushan Liu;Mingcong Xu;Shouxin Liu
中科院分区：
文献类型：
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作者：
Xueyun Wu;Wei Li;Pengchao Wu;Chunhui Ma;Yushan Liu;Mingcong Xu;Shouxin Liu
室温磷光材料因其在防伪和光学成像方面的潜在应用而引起了人们的极大关注。然而，到目前为止，大多数RTP材料的寿命都很短，因为三重态很容易被大气中的氧气猝灭，从而限制了它们的全部潜能。本论文将水热法制备的掺氮碳量子点(NCQD)分散到聚乙烯醇(PVA)基质中，制备了常温常压下具有超长寿命的发光材料。N-CQds/PVA复合材料分别为3D气凝胶和薄膜，在常温下的长寿命为442ms，平均寿命为416ms。这种高效的室温磷光现象可以归因于0.246 eV和0.23 eV的单态和三态(ΔE)之间的小能隙
Room-temperature phosphorescent (RTP) materials have attracted significant attention because of their potential applications in anticounterfeiting and optical imaging. However, most RTP materials developed to date have short-lived lifetimes, because the triplet excited states are easily quenched by atmospheric oxygen, thus limiting their full potential. Herein, nitrogen-doped carbon quantum dots (NCQDs), prepared by hydrothermal method, are dispersed into a poly(vinyl alcohol) matrix to fabricate phosphorescent materials with ultralong lifetimes at ambient temperature and atmosphere. The N-CQDs/PVA composites, which are 3D aerogel and thin film respectively, display a long lifetime of 442 ms and an average lifetime of 416 ms at ambient conditions. The efficient room-temperature phosphorescence phenomenon can be attributed to the small energy gaps between the singlet and triplet states (ΔE ) of 0.246 eV and 0.23 S,T