Details

Autor(en) / Beteiligte

• Kubus, Mariusz
• Kłonkowski, Andrzej M.
• Lotnyk, Andriy
• Kienle, Lorenz

Titel

Luminescence enhancement in composite material: CaWO4:Tb3+ nanocrystals incorporated into silica xerogel

Ist Teil von

• Materials chemistry and physics, 2015-01, Vol.149-150, p.424-429

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2015

Quelle

ScienceDirect

Beschreibungen/Notizen

• Calcium tungstate CaWO4 nanoparticles doped with Tb3+ of 20nm in average size were prepared by sonochemical method. The crystallites were immobilized in a silica matrix by the sol–gel method. The matrix in the CaWO4:Tb3+@SiO2 composite material plays two roles. First of all it provides a good coverage of the nanoparticle defected surface and it prevents the nanoparticles from agglomeration. The nanoparticles capped with silica are characterized by energy transfer from WO42− group to Tb3+ thus enabling luminescence enhancement of the latter ions. The composite luminescent material was analyzed by X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), energy-dispersive X-ray spectroscopy (EDX), selected area electron diffraction (SAED) and luminescence techniques. CaWO4:Tb3+@SiO2 exhibits higher emission intensity than CaWO4:Tb3+ in the nanopowder form. [Display omitted] •Composite luminescent material consisting of CaWO4:Tb nanoparticles embedded in silica matrix was prepared.•Energy transfer from SiO2 matrix and WO42− groups to Tb3+ ions was observed.•The nanoparticles capped with silica exhibited enabling luminescence enhancement.