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Gd2O3:Eu3+纳米晶的燃烧合成及光致发光性质
Combustion synthesis and photoluminescence of nanocrystalline Gd2O3:Eu3+
【摘要】 采用柠檬酸作燃烧剂用燃烧合成法制备了Gd2O3:Eu3+纳米晶.用X射线衍射仪(XRD)、高分辨透射电子显微镜(HRTEM)和荧光分光光度计等对Gd2O3:Eu3+纳米晶的结构、形貌和发光性能进行了分析.结果表明:不同柠檬酸与稀土离子配比(C/M)制备的样品经800℃退火1h后,均得到了纯立方相的Gd2O3:Eu3+纳米晶,晶粒尺寸约为30nm,尺寸分布较窄,其中以C/M=1.0时制备的纳米晶结晶性最好,发光强度最大.Gd2O3:Eu3+纳米晶主发射峰位置均在612nm处(5D0→7F2跃迁),激发光谱中电荷迁移态发生红移,观察到Gd3+向Eu3+的有效能量传递.对柠檬酸与稀土离子配比(C/M)对结晶度、发光性质等的影响也进行了分析和讨论.
【Abstract】 Nanocrystalline Gd2O3:Eu 3+ was prepared by modified combustion synthesis using citric acid as the fuel and metal nitrates as oxidants. By using X-ray diffraction (XRD),high resolution transmission electron microscopy (HRTEM) and fluorescence spectrophotometry, the structural, morphological and luminescent properties of the nanocrystals were investigated. The results showed that Gd2O3:Eu 3+ nanocrystal with pure cubic phase was produced after the samples prepared using different citric acid-to-metal nitrate (C/M) molar ratios were calcined at 800℃ for 1 hour. The grain size was approximately 30 nm and the size distribution was narrow. The Gd2O3:Eu 3+ nanocrystals whit C/M ratio 1.0 had the best crystallinity and strongest photoluminescence. The main emission peak of Gd2O3:Eu 3+ nanocrystal was 612 nm, being attributed to 5D0→ 7F2 transition. The charge transfer state had an obvious red shift in the excitation spectrum. The efficient energy transfer from Gd 3+ to Eu 3+ was also observed. In addition, the influences of C/M molar ratio on crystallinity and luminescent properties were studied and discussed.
【Key words】 nanocrystalline Gd2O3:Eu 3+; combustion synthesis; photoluminescence;
- 【文献出处】 物理学报 ,Acta Physica Sinica , 编辑部邮箱 ,2007年02期
- 【分类号】O482.31
- 【被引频次】46
- 【下载频次】387