title: Enhancing upconverted white light in Tm3+/Yb3+/Ho3+-doped GdVO4 nanocrystals via incorporation of Li+ ions.
abstract: 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.
authors.affiliation: Indian Institute of Science Education and Research Kolkata, Mohanpur Campus, Mohanpur 741 252, India.
authors.forename: Venkataramanan
authors.initials: V
authors.lastname: Mahalingam
authors.forename: Rafik
authors.initials: R
authors.lastname: Naccache
authors.forename: Fiorenzo
authors.initials: F
authors.lastname: Vetrone
authors.forename: John A
authors.initials: JA
authors.lastname: Capobianco
mesh_terms: D003116:Color; D005682:Gadolinium / Q000737:chemistry*; D008027:Light; D008094:Lithium / Q000737:chemistry*; D008422:Materials Testing; D012031:Refractometry / Q000379:methods*; D012542:Scattering, Radiation
chemical_list: D008094:Lithium; D005682:Gadolinium