Search

Eu3+/Dy3+single-doped and co-doped 6SrO-3Al2O3-91SiO2and 12SrO-6Al2O3-82SiO2glass and glass-ceramics were synthesized successfully by a sol-gel method. The prepared samples were characterized by the X-ray diffraction, high-resolution transmission electron microscopy, photoluminescent spectra and X-ray photoelectron spectroscopy. The effect of annealing temperature, doped ions and matrix component on the structure and the photoluminescent characteristics was systematically studied. The higher temperature was helpful to form nanocrystals and the amount of SrO and Al2O3could better disperse the rare earth ions in matrix at suitable temperature, and both of them could improve the luminescent intensity. Meanwhile, the doped ions could change the luminescent color by single, codoped and energy transfer. The Sr2SiO4nanocrystals were observed in silicates glasses and became larger with the increase of the annealing temperature and the luminous efficiency of rare-earth (RE) ions could be enhanced when the samples changed from glass state to glass-ceramic state. The results indicated that the photoluminescent properties could be changed through controlling the doped ions, annealing temperature and matrix component.

The europium ions doped MMoO4(M=Sr, Ba) nanophosphors were successfully synthesized via a facile hydrothermal method using isopropanol. The relationship between phosphor crystalline phase, morphology, photoluminescent properties and hexadecyl trimethyl ammonium bromide (CTAB) concentration, pH value in precursor solution was investigated. The results indicated that the morphology and photoluminescent properties were strongly influenced by CTAB concentration and pH value in precursor solution. In SrMoO4:Eu3+hosts, the phosphor surface tended to become smoother as the concentration of CTAB was increased; while particles tended to agglomerate as increasing pH value. The relative intensity ratio of charge transfer band to Eu3+characteristic emission peaks of MMoO4:Eu3+(M=Sr, Ba) was changed as CTAB concentration and pH value changed. The emission spectra of MMoO4:Eu3+(M=Sr, Ba) could be adjusted by CTAB concentration and pH value due to their impacts on the structure. It was important that the different morphologies and photoluminescent properties of MMoO4:Eu3+(M=Sr, Ba) could be obtained by the facile hydrothermal method and modulated by changing CTAB concentration and pH value.