Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第18卷    第10期    总第115期    2008年10月

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文章编号:1004-0609(2008)10-1879-06
Eu0.12Y1.88−xMxO3−δ(M=Mg, Ca)纳米晶的制备及光致发光性能
司 伟1,姜 妲2,高 宏1,翟玉春3

(1. 大连交通大学 材料科学与工程学院,大连 116028;
2. 沈阳航空工业学院 材料科学与工程学院,沈阳 110136;
3. 东北大学 材料与冶金学院,沈阳 110004
)

摘 要:

在超声波作用下以均匀沉淀法制备Eu0.12Y1.88−xMxO3−δ (M=Mg,Ca)纳米晶荧光粉,用X射线衍射仪(XRD)、透射电镜(TEM)、荧光光谱对其进行表征,研究掺杂Mg2+、Ca2+对Y2O3:Eu3+纳米晶光致发光(PL)性能的影响。结果表明,掺杂Mg2+后,Y2O3׃Eu3+的PL发射强度减弱,而掺杂Ca2+后Y2O3׃Eu3+的PL发射强度得到明显增强,掺杂浓度高至15%(摩尔分数)后仍具有优良的发光性能,大大提高掺杂Y2O3׃Eu3+纳米晶的猝灭浓度。样品Eu0.12Y1.78Ca0.10O3−δ具有最佳PL发射强度,是未掺杂Y2O3׃Eu3+的2.4倍,且色纯度显著提高。掺杂样品PL性能的增强可归因于Eu3+的电荷迁移带(CTS)与接近Y(4d+5s)导带处缺陷态的叠加,与掺杂离子的电负性及掺杂离子后样品的晶粒尺寸、结构对称性有关。

 

关键词: 纳米晶;均匀沉淀法;光致发光;掺杂

Preparation and photoluminescence of nanocrystal Eu0.12Y1.88−xMxO3−δ (M=Mg, Ca)
SI Wei1, JIANG Da2, GAO Hong1, ZHAI Yu-chun3

1. School of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028, China;
2. School of Materials Science and Technology, Shenyang Institute of Aeronautical Engineering, Shenyang 110136, China;
3. School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China

Abstract:The nanocrystal phosphor Eu0.12Y1.88−xMxO3−δ (M=Mg, Ca) was prepared by ultrasonic and homogeneous precipitation method. X-ray diffraction(XRD), transmission electron microscope (TEM) and fluorescence spectrum were employed to analyze the nanocrystal structures, lattice constants, grain sizes, particle morphology and photoluminescence (PL) properties of Eu0.12Y1.88−xMxO3− (M=Mg, Ca). The results show that the PL emission intensity of Y2O3׃Eu3+ decreases after doping Mg2+ but increase remarkably after doping Ca2+. The nanocrystals have the good luminous efficacy as the Ca2+ doped concentration is up to 15%(mass fraction), which increases the quenching concentration. The sample Eu0.12Y1.78Ca0.10O3−δ has the best PL emission intensity and its emission peaks intensity is 2.4 times as that of the sample undoped and increases remarkably on color purity. From our results, the enhancement of PL properties by the Ca2+ co-dopants is explained in terms of the creation of defect states near the Y (4d+5s) conduction band, which overlaps with the Eu3+ charge transfer state (CTS). This enhancement is related to electronegativities of co-doped ion, grain size and symmetry of the sample doped.

 

Key words: nanocrystal; homogeneous precipitation method; photoluminescence; doped

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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