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Carbon dots (CDs) have attracted attention in metal‐free afterglow materials, but most CDs were heteroatom‐containing and the afterglow emissions are still limited to the short‐wavelength region. A universal approach to activate the room‐temperature phosphorescence (RTP) of both heteroatom‐free and heteroatom‐containing CDs was developed by one‐step heat treatment of CDs and boric acid (BA). The introduction...
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