A new type of samarium ion activated luminescent glass ceramics with main crystal phase of melilite was prepared. The effect of heat-treatment temperature on the structure of glass ceramics was investigated by X-ray d...A new type of samarium ion activated luminescent glass ceramics with main crystal phase of melilite was prepared. The effect of heat-treatment temperature on the structure of glass ceramics was investigated by X-ray diffraction analysis（XRD）, scanning electron microscope（SEM） and fluorescence spectrometer. In the Sm^3＋ doped SrO-MgO-SiO2 glass ceramic, its excitation spectra are in the wavelength range of 350-500 nm, and its excitation peaks are at 360 nm, 374 nm, 404 nm, 417 nm, and 475 nm with the host excitation peak of 404 nm, showing a strong orange-red luminescence when using 404 nm violet to excite it, and its emission peaks are at 564 nm, 600 nm and 648 nm with the host emission peak at 600 nm. The increase in the heat-treatment temperature has no infl uence on the position of the fl uorescent spectra. However, with the increase of heat-treatment temperature, the intensity of fl uorescence spectrum shows an increasing tendency. The increase in the concentration of Sm3＋ also improves the intensity of the fl uorescent spectra. In the experimental concentration range（0.05mol%-0.30mol%）, a special concentration quenching phenomenon happens.展开更多
Eu^3＋/Dy^3＋ single-doped and co-doped 6SrO-3Al2O3-91SiO2 and 12SrO-6Al2O3-82SiO2 glass and glass-ceramics were synthesized successfully by a sol-gel method. The prepared samples were characterized by the X-ray diffr...Eu^3＋/Dy^3＋ single-doped and co-doped 6SrO-3Al2O3-91SiO2 and 12SrO-6Al2O3-82SiO2 glass 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 Al2O3 could 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 Sr2SiO4 nanocrystals 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.展开更多
基金Funded by the National Basic Research Program of China(2011CB612202)
文摘A new type of samarium ion activated luminescent glass ceramics with main crystal phase of melilite was prepared. The effect of heat-treatment temperature on the structure of glass ceramics was investigated by X-ray diffraction analysis（XRD）, scanning electron microscope（SEM） and fluorescence spectrometer. In the Sm^3＋ doped SrO-MgO-SiO2 glass ceramic, its excitation spectra are in the wavelength range of 350-500 nm, and its excitation peaks are at 360 nm, 374 nm, 404 nm, 417 nm, and 475 nm with the host excitation peak of 404 nm, showing a strong orange-red luminescence when using 404 nm violet to excite it, and its emission peaks are at 564 nm, 600 nm and 648 nm with the host emission peak at 600 nm. The increase in the heat-treatment temperature has no infl uence on the position of the fl uorescent spectra. However, with the increase of heat-treatment temperature, the intensity of fl uorescence spectrum shows an increasing tendency. The increase in the concentration of Sm3＋ also improves the intensity of the fl uorescent spectra. In the experimental concentration range（0.05mol%-0.30mol%）, a special concentration quenching phenomenon happens.
基金Project supported by the National Natural Science Foundation of China(51562025)Graduate Student Innovation Special Funds(YC2016-S085) of Jiangxi Province
文摘Eu^3＋/Dy^3＋ single-doped and co-doped 6SrO-3Al2O3-91SiO2 and 12SrO-6Al2O3-82SiO2 glass 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 Al2O3 could 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 Sr2SiO4 nanocrystals 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.
