Thermoluminescence and synchrotron radiation studies on the persistent luminescence of BaAl(2)O(4)/Eu(2+),Dy(3+)

The persistent luminescence materials, barium aluminates doped with Eu(2+) and Dy(3+) (BaAl(2)O(4): Eu(2+),Dy(3+)), were prepared with the combustion synthesis at temperatures between 400 and 600 degrees C as well as with the solid state reaction at 1500 degrees C. The concentrations of Eu(2+)/Dy(3+) (in mol% of the Ba amount) ranged from 0.1/0.1 to 1.0/3.0. The electronic and defect energy level structures were studied with thermoluminescence (TL) and synchrotron radiation (SR) spectroscopies: UV-VUV excitation and emission, as well as with X-ray absorption near-edge structure (XANES) methods. Theoretical calculations using the density functional theory (DFT) were carried out in order to compare with the experimental data. (C) 2010 Elsevier Inc. All rights reserved.

Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)

Rede de Nanotecnologia Molecular e de Interfaces (RENAMI)

Rede de Nanotecnologia Molecular e de Interfaces (RENAMI)

IM2C (Instituto do Milenio de Materiais Complexos)

Instituto do Milenio de Materiais Complexos (IM2C)

Instituto Nacional de Ciencia e Tecnologia-Nanotecnologia para Marcadores Integrados (inct-INAMI)

Instituto Nacional de Ciencia e Tecnologia-Nanotecnologia para Marcadores Integrados (inct-INAMI)

Coimbra Group

Coimbra Group

Turku University Foundation

Turku University Foundation

Jenny and Antti Wihuri Foundation (Finland)

Jenny and Antti Wihuri Foundation (Finland)

Academy of Finland[112816/2006/JH]

Academy of Finland

Academy of Finland

Academy of Finland[116142/2006/JH]

Academy of Finland[123976/2007/TL]

Academy of Finland

European Community

European Community[RII3-CT-2004-506008 (IA-SFS)]

AVCR Academy of Sciences of the Czech Republic

AVCR Academy of Sciences of the Czech Republic