Jawaher K Rackesh, Jagannathan R, Das S Jerome, Krishnan S
Department of Physics, B.S.Abdur Rahman University, Chennai 600 048, India.
Central Electrochemical Research Institute, Karaikudi 630006, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2015 Apr 5;140:364-71. doi: 10.1016/j.saa.2014.12.109. Epub 2015 Jan 3.
Europium ion doped olgite type Na(Sr,Ba)PO4 ceramics, a new generation of light emitting bulb, was prepared by a high temperature solid-state reaction method. The synthesized materials were subjected to various characterizations such as X-ray powder diffraction, Scanning electron microscopy and FT-IR spectra measurements. The EPR spectrum of the sample exhibits a well-resolved hyperfine structure of 151Eu2+ and 153Eu2+ isotopes and the g value has been calculated. Fluorescence spectra revealed that europium ions were present in divalent as well as in the trivalent oxidation states. The critical distance for energy transfer between Eu2+ and Eu2+ ion is calculated as 20Å, which is in good agreement with that of experimental data. The FTIR analysis reveals all the vibrations of PO4(3-) ions.
通过高温固相反应法制备了新一代发光灯泡——铕离子掺杂的橄榄石型Na(Sr,Ba)PO4陶瓷。对合成材料进行了各种表征，如X射线粉末衍射、扫描电子显微镜和傅里叶变换红外光谱测量。样品的电子顺磁共振谱显示出151Eu2+和153Eu2+同位素分辨率良好的超精细结构，并计算出了g值。荧光光谱表明铕离子以二价和三价氧化态存在。计算出Eu2+与Eu2+离子之间能量转移的临界距离为20Å，与实验数据吻合良好。傅里叶变换红外光谱分析揭示了PO4(3-)离子的所有振动。
