Abstract
The photoluminescence (PL) properties of Sr2−xCaxNb2O7:Pr3+ were investigated in this study. The system exhibited three different states when Sr2+ ion was replaced by Ca2+ ion gradually. The excitation spectra showed the absorptions of the charge transfer (CT) transition of NbO67- and intervalence charge transfer (IVCT) transition of Pr3+→Nb5+. The transitions from 3H4 to 3PJ (J=0, 1, and 2) of Pr3+ were located at 452, 474, and 490nm. The main excitation peak changed with the phase transformations. The PL spectra of Sr2−xCaxNb2O7:Pr3+ excited with 320nm showed two intense regions in the wavelength of 480–517nm (blue-green) and 585–640nm (orange-red). With increasing content of Ca2+ ion, the orange-red band enhanced and the Commission International de l’Echairage (CIE) moved from blue-green to white and then to purple.
Published Version
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