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White light upconversion in Yb-sensitized (Tm, Ho)-doped KLu(WO4)2 nanocrystals: the effect of Eu incorporation

AutorBarrera, E. W.; Pujol, María Cinta; Carvajal, Joan Josep; Mateos, Xavier; Sole, Rosa; Massons, Jaume; Cascales, Concepción ; Aguilo, Magdalena
Fecha de publicación2014
EditorRoyal Society of Chemistry (Great Britain)
CitaciónPhysical Chemistry Chemical Physics 16(4): 1679-1686 (2014)
ResumenMonoclinic Yb-sensitized (Tm, Ho)-doped KLu(WO4)2 nanocrystals of ∼100 nm size have been synthesized by the modified Pechini sol-gel method. Their diode laser near-infrared (∼980 nm) excited upconversion emission properties have been characterized at power densities in the range 30-355 W cm-2. Bright white light composed of blue ∼475 nm, green ∼540 nm, and red ∼650 nm emissions, corresponding to Tm 3+ 1G4 → 3H6, Ho 3+ 5S2, 5F4 → 5I8, and Ho3+ 5F5 → 5I8 electronic transitions, respectively, was generated by adjusting the Yb, Tm, and Ho contents in KLu(WO4)2 nanocrystalline samples. Chromaticity coordinates of the emitted white light can be tuned by modifying the excitation power density. The effect of Tm and Ho on the luminescence dynamics has been described by analyzing the upconverted emission intensity dependence on the excitation power, as well as from Stokes and decay time measurements. The effect on upconversion properties of further codoping with Eu in these (Tm, Ho, Yb)-doped KLu(WO4)2 nanocrystals has also been studied.
URIhttp://hdl.handle.net/10261/95718
DOI10.1039/c3cp53847h
Identificadoresdoi: 10.1039/c3cp53847h
issn: 1463-9076
e-issn: 1463-9084
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