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Persistent luminescence nanoparticles (PLNPs) and upconversion nanoparticles (UCNPs) are two special optical imaging nanoprobes. In this study, efficient upconverted persistent luminescence (UCPL) is realized by combining their unique features into polymethyl methacrylate, forming a film composed of both PLNPs and UCNPs. The red persistent luminescence (~640 nm) of the PLNPs (CaS:Eu,Tm,Ce) can be...
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