Open AccessEnhancing upconverted white light in Tm^3+/Yb^3+/Ho^3+-doped GdVO_4 nanocrystals via incorporation of Li^+ ions
Author(s) -
Venkataramanan Mahalingam,
Rafik Naccache,
Fiorenzo Vetrone,
John A. Capobianco
Publication year - 2011
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.000111
Subject(s) - photon upconversion , ion , materials science , nanocrystal , optics , doping , white light , fluorescence , excitation , optoelectronics , analytical chemistry (journal) , chemistry , physics , nanotechnology , chromatography , quantum mechanics , organic chemistry
The white light emission of Tm3+/Yb3+/Ho3+-doped GdVO4 nanocrystals, following excitation with near-infrared light (λexc = 980 nm), via a multiphoton upconversion process is presented. Upconverted blue emission from the Tm3+ ions as well as green/red emissions from the Ho3+ ions contributes to the observed white light. The calculated Commission internationale de l'éclairage (CIE) color coordinates were calculated to be x = 0.34; y = 0.32 and lie at the center of the white region. Furthermore, the intensity of the upconverted white light was enhanced by the incorporation of monovalent Li+ ions into the GdVO4 matrix. An explanation for this enhancement is proposed based on X-ray diffraction and fluorescence lifetime measurements.