PREPARATION AND OPTICAL PROPERTIES OF CORE-SHELL CAF2:YB, ER@SIO2 NANOPARTICLES

摘要

High quality CaF2: Yb, Er @ mesoporous SiO2 core-shell nanoparticles were prepared by coating silica shell onto solvothermal synthesized CaF2: Yb, Er nanoparticles through reverse microemulsion and liquid crystal template processes. The phase identification, morphology and upconversion luminescence properties of CaF2: Yb, Er @SiO2 core-shell nanoparticles were investigated in detail. The results show that CaF2: Yb, Er nanocrystals are of cubic structure and SiO2 shell is mesoporous. The core-shell structure has little effect on the upconversion properties of CaF2: Yb, Er nanoparticles. And the nanocomposites with upconversion luminescent CaF2: Yb, Er nanocrystals core and a mesoporous silica shell are potential photocontrollable drug vehicles.