Journal
ACS MATERIALS LETTERS
Volume 1, Issue 1, Pages 58-63Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsmaterialslett.9b00073
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Funding
- National Natural Science Foundation of China [21621001, 21835002, 21671075, 21801069]
- 111 Project [B17020]
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Room-temperature phosphorescence (RTP) and thermally activated delayed fluorescence (TADF) materials with long afterglow lifetimes have aroused considerable interest. Here, we successfully achieve the modulation of RTP and TADF properties in a carbon dots (CDs)-inzeolite system based on different organic templates via an in situ solvothermal synthetic method. Benefitting from the efficient stabilizing effect of triplet states of CDs by SBT zeolite matrix, CDs@SBT-1 with a i f larger singlet-triplet energy gap (Delta E-ST) of 0.36 eV exhibits predominant RTP with a lifetime of 574 ms, while CDs@SBT-2 with a smaller Delta E-ST value of 0.18 eV shows TADF with a lifetime of 153 ms. Further investigations reveal that different organic templates result in different CDs structures, thus modulating the Delta E-ST values of CDs@zeolites. This work demonstrates a facile strategy to modulate the afterglow properties of CDs@zeolite composites, which opens the possibility of designing the novel afterglow materials desired for various advanced applications.
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