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Uniform α-NaYF4:Yb3+, Er3+ nanospheres (∼130 nm) with mesoporous shell and hollow interior structure were synthesized by using Y(OH)CO3:Yb3+, Er3+ nanospheres (NPs) as sacrificial templates via a surface-protected “etching” and hydrothermal ion-exchange process. In this process, polyethylenimine (PEI) ligands played a key role in formation of the hollow structured α-NaYF4 nanospheres, i.e., they can...
In this study, we design a controlled release system based on CaF 2 :Ce 3+ /Tb 3+ -poly(acrylic acid) (PAA) composite microspheres, which were fabricated by filling the pH-responsive PAA inside CaF 2 :Ce 3+ /Tb 3+ hollow spheres via photopolymerization route. The CaF 2 :Ce 3+ /Tb 3+ hollow spheres prepared by hydrothermal route...
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