期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 653, 期 -, 页码 345-350出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2015.09.047
关键词
Ca2Sb2O7:Bi3+; Luminescence; Nanoparticle; Co-precipitation
资金
- National Natural Science Foundation of China [21005053]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
A series of Ca2Sb2O7:xBi(3+) (x = 0, 0.5, 1, 1.5, 2, 4 and 8 mol%) blue phosphors were synthesized using a chemical co-precipitation technique with further calcination. The X-ray diffraction (XRD) and scanning electron microscope (SEM) results revealed that the obtained Ca2Sb2O7:xBi samples are orthorhombic weberite structure with particle size ranging from 20 nm to 40 nm. X-ray photoelectron spectroscopy (XPS) confirmed that the introduction of bismuth into the Ca2Sb2O7 crystal was in the form of Bi3+ and no other chemical states were found. The Bi-doped Ca2Sb2O7 powders exhibit a broad emission band centered at 438 nm upon UV-irradiation and it is characterized by double-luminescence centers. The dependence of the luminescent intensity on the Bi-doping concentration in Ca2Sb2O7 was studied in detail. As a result, the optimized concentration of Bi3+ is 1.5 mol% for the highest emission intensity peaking at 438 nm, and the concentration quenching occurs when the concentration of Bi3+ exceeds 1.5 mol%. The luminescence mechanism of Bi3+ in Ca2Sb2O7 was also discussed. The favorable luminescent properties of Ca2Sb2O7:Bi3+ make it promising for lighting and display applications. (C) 2015 Elsevier B.V. All rights reserved.
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