La_(2)Y_(2)Al_(2)O_(9)荧光基质材料的制备及表征

Preparation and Characterization of La_(2)Y_(2)Al_(2)O_(9) Fluorescent Matrix Material

以六水硝酸镧、氧化钇以及九水硝酸铝为原料,按照摩尔比La:Y:Al=1:1:1进行配料,分别以甘氨酸(C2H5NO2)、甘露醇(C_(6)H_(14)O_(6))和尿素(CO(NH_(2))_(2))为燃烧剂,通过溶液燃烧法合成La_(2)Y_(2)Al_(2)O_(9)荧光基质材料。采用X射线衍射仪(XRD)和扫描电镜(SEM)分析了煅烧温度、煅烧时间以及燃烧剂对合成粉体物相和形貌的影响。在以甘氨酸(C_(2)H_(5)NO_(2))为燃烧剂,煅烧温度800℃,煅烧时间4 h的优化工艺条件下可以获得结晶度和纯度较高、形貌较好、链球网状分布的单斜晶系La_(2)Y_(2)Al_(2)O_(9)新型化合物。采用紫外可见光谱仪和荧光光谱仪对所制得的La_(2)Y_(2)Al_(2)O_(9)粉体进行发光性能表征。结果表明,产物在200~400 nm之间有一较宽且强的紫外吸收带,在350~440 nm处出现一个较宽的荧光激发带。因此,La_(2)Y_(2)Al_(2)O_(9)粉体可以作为基质材料应用于发光粉体的制备。

La_(2)Y_(2)Al_(2)O_(9) fluorescent matrix material was synthesized by solution combustion method with lanthanum nitrate hexahydrate,yttrium oxide and aluminum nitrate nonahydrate having La:Y:Al molar ratio of 1:1:1 as raw materials,and glycine(C_(2)H_(5)NO_(2)),mannitol(C_(6)H_(14)O_(6))and urea(CO(NH_(2))_(2))as combustion agents,respectively.The effects of calcination temperature,calcination time and combustion agents on the phase and appearance of the synthetic powder were analyzed by X-ray diffractometer(XRD)and scanning electron microscope(SEM).Under the optimized process conditions of glycine(C_(2)H_(5)NO_(2))as combustion agent,calcination temperature 800℃ and calcination time 4 h,a new compound La_(2)Y_(2)Al_(2)O_(9) with high crystallinity and purity,good morphology and hammer net distribution can be obtained,and it belongs to the monoclinic crystal system.The luminescent properties of La_(2)Y_(2)Al_(2)O_(9) powder were characte-rized by ultraviolet visible spectrometer and fluorescence spectrometer.The results show that the product has a wide and strong ultraviolet absorption band at 200~400 nm and a wide fluorescence excitation band at 350~440 nm.Therefore,La_(2)Y_(2)Al_(2)O_(9) powder can be used as a matrix material in the preparation of luminescent powder.