(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:
关键字: 纳米晶；均匀沉淀法；光致发光；掺杂
（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
