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XAFS at Eu-L3 edge and UV-VUV excited luminescence of europium doped strontium borophosphate prepared in air |
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| Authors: | H.-B LiangQ Su Y TaoT.-D Hu T LiuS.L.E Shulin |
| Affiliation: | a Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China b School of Chemistry and Chemical Engineering, Zhongshan University, Guangzhou, Guangdong 510275, China c Laboratory of Beijing Synchrotron Radiation, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, China d Laboratory of Excited State Processes, Changchun Institute of Optical Fine Machines and Physics, Chinese Academy of Sciences, Changchun, Jilin 130021, China |
| Abstract: | The local structure and the valences of europium in SrBPO5:Eu prepared in air were checked by means of XAFS at Eu-L3 edge. From the EXAFS results, it was discovered that the doped europium atoms were nine-coordinated by oxygen atoms and the distances of bond Eu-O were 2.42 Å in the host. From the XANES data, it was found that the divalent and trivalent europium coexisted in the matrix. The emission spectra excited by VUV or UV exhibited a prominent broad band due to the 4f65d-4f7 transition of Eu2+ ions, which indicated that the trivalent europium ions were reduced in air in the matrix at high temperature by the defects [VSr]″ formed by aliovalent substitution between Sr2+ and Eu3+ ions. The VUV excitation spectra in 100-200 nm range showed that the matrix had absorption bands with the maxima at about 130 and 150 nm, respectively. |
| Keywords: | D. Luminescence C. XAFS (EXAFS and XANES) |
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