Abstract
Due to the high stability, hypotoxicity and tunable optical properties, room temperature phosphorescence (RTP) carbon dots (CDs) have a great range of application in anti-counterfeiting encryption, bioimaging and optoelectronic devices, etc. Nevertheless, the synthesis procedures for RTP CDs are always pricey, burdensome and involve toxic chemicals. Herein, a facile method to produce RTP CDs materials by heat treatment of creatine and boric acid (BA) at 350 °C is reported. TEM, XRD, FT-IR and XPS are carried out and the structural characterizations showed that B–C covalent bond and CDs embedded in the rigid B2O3 matrix stabilize the triplet excitons and limit the nonradiative transition. The yellow green RTP CDs/BA displayed an ultralong lifetime of 1.286 s and last more than 5 s to naked eye. What's more, the prepared CDs/BA are successfully applied in anti-counterfeiting and information encryption. This work provides new insights to design metal-free RTP CDs with persistent luminescence for promising remarkable applications.
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