Abstract
Materials with room temperature phosphorescence (RTP) have long lifetimes and large Stokes shifts, making them excellent candidates for bioimaging, anticounterfeiting, and encryption applications. As a metal-free RTP material, carbon dots (CDs), have received considerable attention. Using vitamin B9 (V) and ethylenediamine (EDA) as raw materials, blue fluorescent VCDs are synthesized by a one-step hydrothermal process in our study. A boric acid (BA) matrix is then used to embed the CDs, and VCDs@BA is prepared as an environmentally friendly and economical RTP material. Bright blue fluorescence and vivid green phosphorescence are released by VCDs@BA. The phosphorescence may last up to 6.0 s and has a lifespan of 311 ms. The photoluminescence quantum yield of the material is as high as 11.03%. VCDs@BA has been utilized effectively in applications for information security and anti-counterfeiting because of its optic property. This research offers a sustainable method for the synthesis of RTP materials, which is a feasible way to create room-temperature phosphorescent materials with excellent efficacy and prolonged afterglow durations.
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