Multilayer structures of upconversion nanophosphors are widely considered as an effective and necessary strategy to achieve efficient luminescence. However, the synthesis of high-quality upconversion nanoparticles in a controllable and reproducible... Click to show full abstract
Multilayer structures of upconversion nanophosphors are widely considered as an effective and necessary strategy to achieve efficient luminescence. However, the synthesis of high-quality upconversion nanoparticles in a controllable and reproducible...
               
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