Energy transfer phenomena in Er3+, Yb3+, Tm3+ tri-doped lanthanum oxysulfide phosphors
Résumé
Lanthanum oxysulfide (La2O2S) was investigated as an effective doping matrix for the development of Er3+, Yb3+, Tm3+ tri-doped phosphors emitting white light. The powders were prepared by combustion synthesis and subsequently post-sulfurized under H2S/N2 . They were characterized using Powder X-Ray Diffraction, Fourier-Transform Infrared Spectroscopy, Scanning Electron Microscopy and thermogravimetric analysis to assess their purity, morphology and thermal stability. The excitation, down-conversion and up-conversion properties of the phosphors were then studied using UV/Visible/NIR and fluorescence spectroscopy. Although white emission was not achieved with the studied compositions, a mechanism for up-conversion energy transfer in the tri-doped samples is proposed.
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