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Summary: This study demonstrates the realization of white-light room-temperature long-lived afterglow emission from CD powder, with a synergy between the phosphorescence of the carbon core and the delayed fluorescence associated with surface C(sic)N moieties. By matching the singlet state of the surface groups of CDs with the long-lived triplet state of the carbon core, an efficient energy transfer is achieved.
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Hui Li et al.
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Qing Cao et al.
Summary: In this study, triplet excitons in carbon nanodots (CNDs) are brightened by embedding them into poly(vinyl alcohol) (PVA) films, resulting in flexible multicolor phosphorescence films. PVA chains isolate the CNDs, reducing triplet exciton quenching, and hydrogen bonds between CNDs and PVA protect triplet excitons from nonradiative recombination.
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Songyuan Tao et al.
Summary: In this study, the confined-domain crosslink-enhanced emission (CEE) effect in carbonized polymer dots (CPDs) was investigated, providing insights into the structure and luminescence properties of CPDs. The findings are of general significance for the further development of CPDs with tailored properties.
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Summary: The first organic long persistent luminescence (OLPL) system based on carbon dots (CDs) with a duration of over 1 hour has been developed. The CDs-based system, named m-CDs@CA, can be easily fabricated using a household microwave oven and exhibits long persistent luminescence under ambient conditions and even in aqueous media. The successful composition of CDs and CA, the formation of exciplexes and long-lived charged-separated states were confirmed by various characterizations. Covalent bond formation between CA and CDs was found to play a key role in activating long persistent luminescence and preventing its quenching from oxygen and water. This work provides new insights for the development of rare-earth-free and robust OLPL materials.
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Ziliang Chen et al.
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Shi-Yu Song et al.
Summary: A large-scale synthesis method for phosphorescent carbon nanodots (CNDs) has been demonstrated via precursors' self-exothermic reaction at room temperature, showing comparable fluorescence and phosphorescence properties with other synthesis methods. The exotic atom doped sp(2) hybridized carbon core serves as an emissive center to facilitate the intersystem crossing, enabling tunable phosphorescence lifetimes from 193 ms to 1.13 s at different temperatures. This method opens up a new avenue for room temperature fabrication of phosphorescent CNDs.
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Shuo Li et al.
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Wenpeng Ye et al.
Summary: The study demonstrates a chemical strategy for achieving high-performance blue phosphorescence by confining isolated chromophores in ionic crystals, forming high-density ionic bonds between the cations of ionic crystals and the carboxylic acid groups of the chromophores to create a segregated molecular arrangement with negligible inter-chromophore interactions.
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