LetterPhotoluminescence properties of SrZrO3:Eu3+ and BaZrO3:Eu3+ phosphors with perovskite structure
Introduction
The AZrO3 (A = Sr, Ba) perovskites, as high temperature materials, have attracted considerable attention because of their potential applications in the field of electronic ceramics, superconductors and so on [1], [2]. Phosphors of rare earth ions doped perovskite-type oxides, such as SrHfO3:Ce [3] and CaTiO3:Pr [4] could be widely used in displays, X-ray phosphors, therefore, many researches focused on luminescent properties of these phosphors recently.
Eu3+ is a good activator ion with red or red-orange emission in many hosts, such as borates [5], niobates [6], tungstates and molybdates [7]. So far only limited information is available regarding Eu3+-doped AZrO3 (A = Sr, Ba) phosphors [8], [9], [10]. In this paper, Sr1−xEuxZrO3 and BaZr1−xEuxO3 phosphors were successfully prepared by the traditional high temperature solid-state reaction. The luminescence properties and the effects of Eu3+-doped content on PL of SrZrO3 and BaZrO3 were also studied. The results of this work could serve as supplementary to the previous work and make the Eu3+-doped AZrO3 (A = Sr, Ba) system more integrated.
Section snippets
Experimental
Both SrZrO3:Eu3+ and BaZrO3:Eu3+ phosphors were prepared by high temperature solid-state reaction. Stoichiometric amounts of Eu2O3 (99.99%), SrCO3 (A.R.), BaCO3 (A.R.) and ZrO2 (A.R.) were accurately weighed, mixed and then grounded in an agate mortar. The mixture was calcined at 1400 °C for 5 h in air.
Powder X-ray diffraction (XRD, 40 kV and 30 mA, Cu Kα = 1.5406 Å Rigaku/Dmax-2500X) was used to identify the structure of the products. Excitation and emission spectra were recorded using a Hitachi
Results and discussion
Fig. 1 presents the XRD patterns of (a) Sr0.95ZrO3:Eu0.053+ and (b) BaZr0.95O3:Eu0.053+ powders, respectively. The position and intensity of diffraction peaks of the two samples are consistent with those of standard powder diffraction file JCPDS 44-0161 (SrZrO3) and JCPDS 06-0399 (BaZrO3), and no phases as Eu2O3 and Eu2Zr2O7 were detected, which indicated that the samples had pure phase. A small amount of Eu3+ doped did not change the lattice of the powder. XRD data showed that SrZrO3 and BaZrO3
Conclusion
Eu3+-doped SrZrO3 and BaZrO3 phosphors were successfully synthesized by solid-state reaction. The optimum Eu3+-doped contents of Sr1−xEuxZrO3 and BaZr1−xEuxO3 powders were both 3 mol%. Based on the PL spectra, Eu3+ might substitute Sr2+ and Zr4+ sites in SrZrO3 host lattice and occupy one zirconium site in BaZrO3. The CIE coordinate values of SrZrO3:Eu3+ and BaZrO3:Eu3+ indicated that the former phosphor can emit reddish-orange light and the latter can emit orange light, which induces that these
Acknowledgments
This work was financially supported by grants from the Science Foundation of Guangxi Province (0731014), Innovation Project of Guangxi Graduate Education, the large-scale instrument of Guangxi cooperates and shares the network (496-2007-075).
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