铕、镨掺共掺杂的钼酸锶的合成与光谱性质

Synthesis and fluorescence properties of strontiun molybdate phosphors codoped Pr^(3+)/Tb^(3+)

以Na_2MoO_4,SrCl_2,Tb(NO_3)_3和Pr(NO_3)_3为合成原料,通过共沉淀法制备了Sr_(0.95)MoO_4:xPr^(3+):(0.05-x)Tb^(3+)荧光粉.采用X-射线粉末衍射仪(XRD)、红外光谱分析(IR)、荧光光谱分析(PL)对样品进行了表征.XRD分析结果说明5%的总掺杂量没有使基质结构发生变化.荧光光谱分析表明Tb^(3+)的4f^8-4f^75d^1的跃迁过程和Mo-O的电荷转移是与宽带吸收有关,在287nm处有最强峰.发射光谱主要是由四个发射峰组成:由于Tb^(3+)的~5D_4→~7F_5跃迁发射,在544nm处出现主峰;Tb^(3+)的~5D_4→~7F_6,~5D_4→~7F_4,~5D_4→~7F_3跃迁分别在491,588,622nm处.Tb^(3+)在223nm紫外光的激发下,Tb^(3+)的~5D_4→~7F_6,~5D_4→~7F_5,~5D_4→~7F_4,~5D_4→~7F_3跃迁会在486,543,583,617nm处有一组发射峰.Pr^(3+),Tb^(3+)同时掺杂在基质中时,~5D_0-~7F_2能级跃迁发射会在490nm附近产生Pr^(3+)的主发射峰,~5D_0-~7F_1能级跃迁会在583nm附近产生弱发射峰.

Sr0.95 MoO4:xPr3+:(0.05-x)Tb3+phosphors were synthesized by chemical co-precipitation preparation method using Na2MoO4,Pr(NO3)3,Tb(NO3)3 and SrCl2 as basis.The crystal structure and spectrum characteristics were characterized by means of X-ray diffraction(XRD)and spectrophoto-fluorometer(PL),etc.XRD analysis indicates the total amount of 5%dopant did not cause a change in crystal structure.4f8-4f75d1 transition process of Tb3+and Mo-O charge transfer is related to the broadband absorption,probably had the strongest peak in the 287nm.On the emission spectrum has four main emission peak because of 5D4-7F5 transition of Tb3+,at 544nm is the main peak.Because of 5D4-7F6,5 D4-7F4,5D4-7F3 transition of Tb3+,appears at 491,588nm,491nm is the other three peaks respectively.Tb3+in 223 under the excitation of ultraviolet light,5D4-7F6,5D4-7F4 and 5D4-7F3 transition of Tb3+has a set of emission peak at 486 nm,543nm and 583nm,617nm.When the Pr3+,Tb3+were codoped,5D0 to 7F2 energy level transition will launch main emission peaks of Pr3+around 490nm,level 5D0-7F1 transition can produce low emission peak around 583nm.