Mechanisms behind blue, green, and red photoluminescence emissions in CaWO4 and CaMoO4 powders

Campos, A. B.; Simoes, A. Z.; Longo, Elson; Varela, José Arana; Longo, V. M.; de Figueiredo, A. T.; De Vicente, F. S.; Hernandes, A. C.

Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/34141

Title:

Mechanisms behind blue, green, and red photoluminescence emissions in CaWO4 and CaMoO4 powders

Author(s):

Institution:

Universidade Estadual Paulista (UNESP)
Universidade Federal de São Carlos (UFSCar)
Universidade de São Paulo (USP)

ISSN:

0003-6951

Abstract:

A combined experimental and theoretical study was conducted to analyze the photoluminescence (PL) properties of ordered and disordered CaWO4 (CW) and CaMoO4 (CM) powders. Two mechanisms were found to be responsible for photoluminescence emission in CW and CM powders. The first one, in the disordered powders, was caused by oxygen complex vacancies [MO3 center dot V-O(x)], [MO3 center dot V-O(center dot)] and [MO3 center dot V-O(center dot center dot)], where M=W or Mo, which leads to additional levels in the band gap. The second mechanism, in ordered powders, was caused by an intrinsic slight distortion of the [WO4] or [MoO4] tetrahedral in the short range. (c) 2007 American Institute of Physics.

Issue Date:

30-Jul-2007

Citation:

Applied Physics Letters. Melville: Amer Inst Physics, v. 91, n. 5, 3 p., 2007.

Time Duration:

3

Publisher:

American Institute of Physics (AIP)

Source:

http://dx.doi.org/10.1063/1.2766856

URI:

Access Rights:

Acesso restrito

Type:

outro

Source:

http://repositorio.unesp.br/handle/11449/34141

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