Zn,Cd对CaTiO_3∶Pr^(3+)的发光性质的影响

Effect of Zn,Cd on the Luminescent Properties of CaTiO_3∶Pr^(3+)

采用高温固相反应合成CaTiO3∶Pr3+、Zn2TiO4、Ca0.7Zn0.3-xCdxTiO3∶Pr3+(x=0.01,0.03,0.05,0.07,0.09,0.1)红色系列粉末状发光材料。经X射线衍射检测其结构,CaTiO3结构为正交晶系,其结果与JCPDS标准卡(42-423)相符。Zn2TiO4结构属立方晶系,结果与JCPDS标准卡(25-1164)一致。Ca0.7Zn0.3-xCdxTiO3∶Pr3+(x=0.01,0.03,0.05,0.07,0.09,0.1)由两种物相组成,一种为CaTiO3,另一种为Zn2TiO4。检测了材料的激发光谱和发射光谱。发现,在CaTiO3∶Pr3+中加入适量Zn可形成Zn2TiO4相,使材料的激发光谱在324nm附近的吸收增强。少量Cd可进入Zn2TiO4晶格,增强激发光谱在324nm附近的吸收,同时提高发射光谱的强度;但过量的Cd的加入会导致发射光谱强度下降。

The samples of CaTiO3： Pr^3＋ ,Zn：TiO4： Pr^3＋ ,Ca0.7Zn0.3-xCdxTiO3： Pr^3＋ （x =0.01, 0.03, 0.05, 0.07, 0.09, 0.1 ） were synthesized by the conventional solid state reaction. XRD measurements confirmed that the prepared CaTiO3： Pr^3＋ and the Zn2TiO4： Pr^3＋ belonged to orthorhombic structure according with JCPDS Card （42-423） and cubic structure according with JCPDS Card （25-1164）, respectively. The XRD profile of the Ca0.7Zn0.3-xCdxTiO3： Pr^3＋ （x = 0.01,0.03, 0.05, 0.07, 0.09, 0.1 ） showed the two phases which were CaTiO3： Pr^3＋ and Zn2TiO4： Pr^3＋ respectively, The excitation spectra of CaTiO3： Pr^3＋ were located at 150-350 nm, and composed of two continuous zone： the first one originated about 230 nm, the second one originated around 321 nm. Both hailed from the absorption of the transition O （ 2p ） →Ti （ 3 d）. The excitation spectra of Zn2TiO4： Pr^3＋ around 324 nm differed from that of CaTiO3： Pr^3＋ , and the excitation spectra of Ca0.7 Zn0. 3 TiO3 ： Pr^3＋ showed the characteristics of both the CaTiO3 ： Pr^3＋ and the Zn2TiO4 ： Pr^3＋ , which indicated the effect of substitution or partial substitution of Zn for Ca on the luminescent properties of CaTiO3： Pr^3＋. In contrast with the Ca0.7Zn0.3TiO3： Pr^3＋ , the excitation spectra of Ca0.7Zn0.3-xCdxTiO3： Pr^3＋ （x .=0.01,0.03,0.05,0.07,0.09,0.1 t were intensified at the narrow peak about 324 nm, which indicated the effect of partial substitution Cd for Zn on the luminescent properties of Ca0.7Zn0.3TiO3： Pr^3＋. The all emission spectra have a sharp peak of Pr^3＋ at about 612 nm characterizing the transition of ^1 D2→^3 H4 of Pr^3 ＋. The intensity of emission peaks of Ca0. 7 Zn0.3 -x CdxTiO3： Pr^3 ＋ （ x = 0. 01,0. 03 ,0. 05 ,0. 07 , 0.09,0. 1 ） was increased with increasing of x value when the x was in the range of 0.01 - 0.07.