利用MCM-48低温制备Y_2SiO_5:Ce^(3+)荧光粉

Low-temperature synthesis of Y_2SiO_5:Ce^(3+) phosphors using MCM-48

以介孔二氧化硅MCM-48为硅源,采用水热处理与固相反应相结合的方法合成Ce3+掺杂的Y2SiO5(Y2SiO5:Ce3+)荧光粉。使用X线衍射、扫描电镜和荧光光谱等测试手段对样品结构、形貌和发光性能进行研究。研究结果表明:煅烧温度为1 200℃时,样品为X1和X2构型的Y2SiO5混合相,1 300℃时样品为X2构型的Y2SiO5单相。煅烧温度升高使激发和发射光谱中峰强度显著增加,发射谱明显红移。将发射宽带高斯拟合成4个峰,分别归属于Y2SiO5基质中2个不同格位(B1和B2)Ce3+的5d→4f(2F5/2和2F7/2)跃迁双峰。

The Ce3＋ ions-doped Y2SiO5 （Y2SiOs：Ce3＋） phosphors were synthesized by a hydrothermal-solid reaction combined method with mesoporous MCM-48 as silica source. The Y2SiOs：Ce3＋ powders were characterized by X-ray diffraction, scanning electron microscope and photoluminescence spectroscopy. The results show that the phosphors calcined at 1 200 ℃ have low-temperature XI-Y2SiO5 and high-temperature X2-Y2SiO5 phase forming, while the phosphors calcined at 1 300 ℃ present single-phase X2-YzSiOs. With the increase of the calcination temperature, the peak intensities in excitation and emission spectra are enhanced and the red shift of emission peak is obviously observed. Four Gaussian peaks fit to the emission spectra are attributed to the 5d→4f（2Fs/2 and 2F7/2） transitions of Ce3＋ in two different sites （Bl and B2 ） in Y2SiO5 matrix.