title: Synthesis and upconversion luminescence of NaYF4:Yb, Tm/TiO2 core/shell nanoparticles with controllable shell thickness.
abstract: NaYF4:Yb, Tm/TiO2 core/shell nanoparticles were synthesized by a two-step method. First, the NaYF4:Yb, Tm nanocrystals were prepared using solvothermal technology; then, TiO2 shells were deposited on the nanocrystals by the hydrolysis of titanium ethoxide (TEOT) to form core/shell structures. By controlling the reaction time, we can adjust the thickness of TiO2 shell and thereby the weight percentage of TiO2 in the core/shell nanoparticles. The effect of shell thickness on the upconversion fluorescence of NaYF4:Yb, Tm nanocrystals was investigated in detail.
authors.affiliation: State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, P. R. China.
authors.forename: Daisheng
authors.initials: D
authors.lastname: Zhang
authors.forename: Dan
authors.initials: D
authors.lastname: Zhao
authors.forename: Kezhi
authors.initials: K
authors.lastname: Zheng
authors.forename: Ning
authors.initials: N
authors.lastname: Liu
authors.forename: Weiping
authors.initials: W
authors.lastname: Qin