Upconversion white light devices: Ln(3+)-tridoped NaYF4 nanoparticles and PVP modified films.
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.
Dong
Biao
B
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.
Song
Hongwei
H
Qin
Ruifei
R
Bai
Xue
X
Lu
Shaozhe
S
Ren
Xinguang
X
Pan
Guohui
G
Zhang
Hui
H
Wang
Fang
F
Fan
Libo
L