title: Upconversion white light devices: Ln(3+)-tridoped NaYF4 nanoparticles and PVP modified films.
abstract: Upconversion (UC) white light hybrid thin films containing Ln(3+)-tridoped (Yb3+, Er3+ and Tm3+) NaYF4 nanoparticles and poly(vinyl pyrrolidone) (PVP, M(w) approximately 1300000) were prepared by a spin-coating method and characterized by X-ray diffraction (XRD), field emission scanning electron micrograph (FE-SEM) and Fourier transform infrared spectra (FT-IR). White light was generated by two different lanthanide ions, Er3+ (red and green) and Tm3+ (blue) under excitation by a 980-nm laser diode. Due to the modification of PVP to the UC populating processes, the color stability of the white light in the hybrid films was remarkably improved.
authors.affiliation: Key Laboratory of Excited State Physics Changchun Institute of Optics, Fine Mechanics and Physics Chinese Academy of Sciences, and Graduate School of Chinese Academy of Sciences, 16 Eastern South-Lake Road, Changchun 130033, P. R. China.
authors.forename: Biao
authors.initials: B
authors.lastname: Dong
authors.forename: Hongwei
authors.initials: H
authors.lastname: Song
authors.forename: Ruifei
authors.initials: R
authors.lastname: Qin
authors.forename: Xue
authors.initials: X
authors.lastname: Bai
authors.forename: Shaozhe
authors.initials: S
authors.lastname: Lu
authors.forename: Xinguang
authors.initials: X
authors.lastname: Ren
authors.forename: Guohui
authors.initials: G
authors.lastname: Pan
authors.forename: Hui
authors.initials: H
authors.lastname: Zhang
authors.forename: Fang
authors.initials: F
authors.lastname: Wang
authors.forename: Libo
authors.initials: L
authors.lastname: Fan