Gd_2O_3:Eu^(3+)纳米晶的燃烧合成及光致发光性质  

Combustion synthesis and photoluminescence of nanocrystalline Gd_2O_3:Eu^(3+)

作　　者：彭智伟[1] 王玲玲[1] 刘晃清[1] 黄维清 邹炳锁[1] 

机构地区：[1]湖南大学应用物理系,长沙410082

出　　处：《物理学报》2007年第2期1162-1166,共5页Acta Physica Sinica

基　　金：高等学校博士学科点专项科研基金(批准号:20050532013)资助的课题~~

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.Nanocrystalline GdO3 ：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, morphologieal 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 crystaliinity and strongest photoluminescence. The main emission peak of GdO3 ：Eu^3 ＋ nanocrystal was 612 nm, being attributed to ^5 D0→^7 F2 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.

关 键 词：Gd2O3:Eu^3+ 纳米晶 燃烧合成 光致发光 

分 类 号：O482.31[理学—固体物理]