期刊
JOURNAL OF LUMINESCENCE
卷 248, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jlumin.2022.118809
关键词
Luminescence lifetimes; Calcium borate; Lanthanide doping; Silver doping; Pulsed optically stimulated luminescence; Time-tagged time-resolved data
类别
资金
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP CEPID-NEUROMAT) [13/07699-0]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES) [001]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) [304107/2019-0]
- Swiss National Science Foundation [206021_177028]
- Swiss National Science Foundation (SNF) [206021_177028] Funding Source: Swiss National Science Foundation (SNF)
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [13/07699-0] Funding Source: FAPESP
The aim of this study was to evaluate the optically stimulated luminescence (OSL) lifetimes of different polycrystalline CaB6O10:Ln, Agx (Ln = Gd, Tb and Ce; x: % molar concentration) compounds. The luminescence lifetimes were determined using time-tagged time-resolved (TTTR) data analysis of the OSL under pulsed stimulation. The results showed that different compounds exhibited different dominant components and lifetimes, and the relative molar concentrations of Gd and Ag had an influence on the lifetimes.
The objective of this work is to evaluate the optically stimulated luminescence (OSL) lifetimes of different polycrystalline CaB6O10:Ln, Agx (Ln = Gd, Tb and Ce; x: % molar concentration) compounds. For the determination of the luminescence lifetimes, time-tagged time-resolved (TTTR) data of the OSL under pulsed stimulation were analyzed. In addition, OSL emission spectra of the samples were recorded to correlate the emission bands with the estimated lifetimes. Whereas single Ce-doped compound presented a fast dominant component (tau < 0.41 mu s, -63% of the signal), single Gd-doped compound exhibited a slow dominant component (tau = 2.3 ms, -67% of the signal). All Ag-codoped compounds (except for the Ce-Ag-codoped compound) presented a common dominant component with a -43 mu s lifetime, which is ascribed to a broad emission centered at -330 nm. Both lifetimes and OSL emission spectra for the Gd-Ag-codoped compounds suggest that two luminescent centers compete for the radiative recombinations, confirming previous reported results. The relative Gd and Ag molar concentrations also had a strong influence in the estimated luminescence lifetimes of the slow component, probably due to the introduction of shallow trapping centers by silver doping. Furthermore, the temperature dependence of the common luminescence in Ag-codoped compounds appeared to be in agreement with the MottSeitz model for luminescence quenching. This work provides a better understanding of the physical processes and dynamics behind the radiative recombinations linked to OSL in borate compounds.
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