采用凝胶-燃烧法在活性炭弱还原气氛下成功合成了新型荧光粉Sr2MgSi3O9 :Tb3+、Sr2MgSi3O9:Ce3+,Tb3+,用X射线粉末衍射仪(XRD)、扫描电镜(SEM)、荧光分光光度计等对合成产物进行了分析和表征.结果表明,所合成的发光材料与Sr2MgSi2O7具有相似的晶体结构,同属四方晶系.样品一次颗粒近似球形,粒径在100nm左右.Sr2MgSi3O9:Tb3+的激发光谱为一位于249nm的宽带,发射光谱主要由473、491、547、585nm等一系列发射峰组成,其中473nm(5D3→<7F3)为主发射峰,547nm(5D4→7F5)为次发射峰;样品Sr1.955MgSi3O9:Tb3+0.04,Ce3+0.005的激发光谱由峰值分别位于249和335nm的双激发带组成,其中后者为主激发带.在335nm激发下,其发射光谱由两部分组成,其中400nm附近的带状发射对应于Ce3+的发射,而491、547、588nm处的发射峰归属为Tb3+的5+D4→7FJ(J=6,5,4)跃迁发射,最强峰位于547nm,对应Tb3+的5D4→7F5跃迁.此外,探讨了Ce3+掺杂量对样品发光亮度的影响,发现Ce3+可以把能量传递给Tb3+,对Tb3+起到敏化作用.
Novel phosphors Sr2 MgSi3O9: Tb3+ and Sr2 MgSi3 O9 Tb3+, Ce3+ were synthesized by gel-combustion method in weak reductive environment. The as-synthesized phosphors were investigated by XRD, SEM and fluorescence spectrophotometer. The results show that Sr2MgSi3 O9:Tb3+ and Sr2 MgSi3 O9: Tb3+ , Ce3+ phos-phors possess the similar tetragonal crystal structure as that of Sr2MgSi2 O7. The initial particles of as-synthe-sized phosphors are nearly spherical in shape, and the particle size is about 100nm in diameter. The excitation spectrum of Sr2MgSi3 O9:Tb3+is a broad band and the main peak is at 249nm. The emission spectrum is com-posed of a series of peaks, located respectively at 473,491,547 and 585nm. The main peak is at 473nm (5D3→7F3),and the secondary peak is at 547nm(5D4→7F5). The excitation spectrum of Sr1.955MgSi3O9:Tb3+0.04,Ce3+0.005 displays two broad bands with two peaks around 249 and 335nm respectively; the latter peak is much stronger than the former. Under 335nm irradiation, the emission spectrum is composed of two parts. One part is a broad band at around 400nm,which belongs to the emission of Ce3+. The other part is composed of a series of peaks,located respectively at 491,547 and 588nm. These emission peaks are ascribed respectively to Tb3+ ionstransition of 5D4→7FJ (J=6,5,4) in Sr2MgSi3O9:Tb3+,Ce3+. The main emission peak is at 547nm(5D4→7F5). Moreover, the effect of Ce3+ doping amount on luminescent intensity was discussed. It is found that en-ergy transfer from Ce3+ to Tb3+ is efficient and sensitization lie in Ce3+ to Tb3+ in Sr2MgSi3O9 host under UV light.
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