Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 7, Issue 2, Pages 230-236Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8tc04482a
Keywords
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Funding
- 973 Program [2014CB932103]
- National Natural Science Foundation of China [21571014, 21521005]
- Beijing Municipal Natural Science Foundation [2172044]
- Open Research Fund Program of Beijing Key Lab of Plant Resource Research and Development [PRRD-2016-YB5]
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Designing highly effective organic room temperature phosphorescent (ORTP) materials presents great technical challenges due to their weak spin-orbit coupling and intense non-radiative transitions. Herein, we employ layered double hydroxides (LDHs) as a host matrix, and present a design principle to activate ORTP of carbon dots (CDs) through three synergistic effects. Impressively, the obtained Zn-CDs-LDHs present high phosphorescence quantum yield (PQY) of up to 9.58% and ultralong RTP lifetime of 719.9 ms at ambient conditions, which is higher than those of most reported CD-based materials. Activated ORTP originates from: (1) structural confinement provided by the nanospaces of LDHs reduces the non-radiative decay of triplet excitons and boosts the T-1 -> S-0 radiative relaxation; (2) non-noble metal Zn(II) in LDH interlayer disturbs the symmetry of triplet excitons and antisymmetry of singlet excitons by strong spin-orbit coupling and enhances the intersystem crossing (ISC) from the singlet excited state (Sn) to the triplet manifold (T-n); and (3) chemical bonding (coordination, covalent, electrostatic, and hydrogen bonding) between the rigid LDH matrix and the interlayer CDs. Design strategies that account for such synergistic effects will open new avenues for the development of advanced ORTP phosphors with ultralong lifetimes.
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