title: Improved Upconversion Luminescence in Water-Soluble Yb3+/Er3+ Codoped LaF3 Nanoparticles Through Ca2+ Doping.
abstract: Monodisperse water-soluble LaF3: Yb3+/Er3+ nanocrystals (NCs) have been successfully fabricated via a fast, facile, and environmentally-friendly polyol process with polyvinylpyrrolidone (PVP) as an amphiphilic surfactant. The obtained NCs with a small size of 18 nm can be well dispersed in hydrophilic solutions. Meanwhile, their upconversion (UC) luminescence intensity was increased through Ca2+ doping due to the decrease of symmetry around rare earth ions.
authors.forename: Shihu
authors.initials: S
authors.lastname: Liu
authors.forename: Peng
authors.initials: P
authors.lastname: Zhang
authors.forename: Daguang
authors.initials: D
authors.lastname: Li
authors.forename: Min
authors.initials: M
authors.lastname: Lan
authors.forename: Zhe
authors.initials: Z
authors.lastname: Wang
authors.forename: Weiping
authors.initials: W
authors.lastname: Qin
authors.forename: Dan
authors.initials: D
authors.lastname: Zha
authors.forename: Lili
authors.initials: L
authors.lastname: Wang