Nanostructured CaWO4, CaWO4 : Pb2+ and CaWO4 : Tb3+ particles: Polyol-mediated synthesis and luminescent properties


Autoria(s): Wang ZL; Li GZ; Quan ZW; Kong DY; Liu XM; Yu M; Lin J
Data(s)

2007

Resumo

Nano-submicrostructured CaWO4, CaWO4 : Pb2+ and CaWO4 : Tb3+ particles were prepared by polyol method and characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), Fourier transform infrared spectra (FT-IR), thermogravimetry-differential thermal analysis (TG-DTA), photoluminescence (PL), cathodo-luminescence (CL) spectra and PL lifetimes. The results of XRD indicate that the as-prepared samples are well crystallized with the scheelite structure of CaWO4. The FE-SEM images illustrate that CaWO4 and CaWO4 : Pb2+ and CaWO4 : Tb3+ powders are composed of spherical particles with sizes around 260, 290, and 190 nm respectively, which are the aggregates of smaller nanoparticles around 10-20 nm. Under the UV light or electron beam excitation, the CaWO4 powders exhibits a blue emission band with a maximum at about 440 nm. When the CaWO4 particles are doped with Pb2+, the intensity of luminescence is enhanced to some extent and the luminescence band maximum is red shifted to 460 nm. Tb3+-doped CaWO4 particles show the characteristic emission of Tb3+ D-5(4)-F-7(J) (J=6-3) transitions due to an energy transfer from WO42- groups to Tb3+.

Identificador

http://ir.ciac.jl.cn/handle/322003/13227

http://www.irgrid.ac.cn/handle/1471x/149027

Idioma(s)

英语

Fonte

Wang ZL;Li GZ;Quan ZW;Kong DY;Liu XM;Yu M;Lin J.Nanostructured CaWO4, CaWO4 : Pb2+ and CaWO4 : Tb3+ particles: Polyol-mediated synthesis and luminescent properties,JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY,2007 ,7(2):602-609

Palavras-Chave #CALCIUM TUNGSTATE CRYSTALS #THIN-FILMS #BLUE-LUMINESCENCE #ENERGY-TRANSFER #PHOSPHOR #NANOPARTICLES #EMISSION #PB #CA #PHOTOLUMINESCENCE
Tipo

期刊论文