Abstract
A systematic investigation of the luminescence spectroscopy of Y(P,V)O4:Bi3+ is presented. The emission spectra and the decay curves are measured as a function of the host morphology, composition, temperature, excitation wavelength, and doping concentration. On this basis, the nature of the excited states and the radiative and non-radiative relaxation processes are discussed. Colour coordinates and quantum yield measurements are also carried out to provide information about the potential applications of the studied materials.
Highlights
The luminescence of Bi3+ in oxide materials has been extensively investigated for a long time from both the applicative and the fundamental points of view [1,2,3]
The peak broadening observed in the patterns of the solid solutions suggests the presence of disorder induced by the random distribution of the (VO4) and (PO4) units within the host lattice
In a number of studies on Bi3+-doped into wide bandgap hosts, a similar emission was interpreted as the radiative decay of a localized charge transfer state arising from a photoionization process in which the luminescent centre ejects an electron into the host lattice conduction band [30,31,32]
Summary
The luminescence of Bi3+ in oxide materials has been extensively investigated for a long time from both the applicative and the fundamental points of view [1,2,3]. The beneficial effect of Bi3+ co-doping on the luminescence performance of different lanthanide ions upon UV-blue excitation has been demonstrated in various host lattices, including YAG [4], YBO3 [5], CaTiO3 [6], YPO4, YVO4, and (in the last two cases) in their mixed phases [7,8,9]. The emission mechanisms in both singly and co-doped materials strongly depend on the interactions between the Bi3+ doping ions and the host lattice. In this context, YPO4 and YVO4 and their mixed phases constitute a good model system for the investigation of Bi3+ emission properties. The remainder have rather different physical and spectroscopic properties, as shown in table 1
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