Spectroscopic investigations on SrAl2O4 polymorphs

Boutinaud, Philippe; Boyer, Damien; Perthué, Anthony; Mahiou, Rachid; Cavalli, Enrico; Brik, M.G.

doi:10.1016/j.jlumin.2014.11.006

Cited by 9 publications

(11 citation statements)

References 30 publications

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“…This narrow line probably is emission from Mn 4+ since in Ref. [14] is shown that these transient metal ions in SrAl2O4 poly-morphs are responsible for lines within 652-657 nm. As mentioned in Ref.…”

Section: Luminescence Of Sral2o4mentioning

confidence: 81%

“…The 652 nm narrow band luminescence excitation peak close to the 325 nm could be related to Mn 4+ excitation [14] The two excitation peaks at ∼230…”

Section: Luminescence Of Sral2o4mentioning

confidence: 93%

“…As mentioned in Ref. [14], traces of transition metals are present even in material that has been synthesized from high purity grade precursor materials.…”

Section: Luminescence Of Sral2o4mentioning

confidence: 97%

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The search for defects in undoped SrAl2O4 material

et al. 2019

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SrAl2O4:Eu,Dy is a very efficient long afterglow phosphor with wide range of possible applications. The lumi-nescence properties and the possible luminescence mechanism of this material have been studied extensively, but there is almost no information available about the undoped material. Therefore, this article deals with the luminescence and thermally stimulate d luminescence of an undoped SrAl2O4, revealing the possible defects that might be involved in the creation of the long afterglow in doped material. We conclude that undoped material exhibits some luminescence under X-ray irradiation in low temperature; close to room temperatures lumines-cence is almost fully thermally quenched in comparison to low temperatures. We can observe F and F2 center luminescence as well as trace metal luminescence in the emission spectrum. TSL glow curve yields the peaks that are close to those observed in material with Eu and Dy doping; therefore these peaks are clearly related to intrinsic defects. The peak at around 400 K, that is shifting with rare earth doping, might be due to dopant interaction with intrinsic defects.

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Section: Luminescence Of Sral2o4mentioning

confidence: 81%

“…The 652 nm narrow band luminescence excitation peak close to the 325 nm could be related to Mn 4+ excitation [14] The two excitation peaks at ∼230…”

Section: Luminescence Of Sral2o4mentioning

confidence: 93%

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The search for defects in undoped SrAl2O4 material

et al. 2019

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“…When considering the possible origin of the trap-ping centres, it can not be excluded that similar defects to those in α-Al2O3 could be present in the strontium aluminate -F centres ( , that is close to impossible to get rid of in the synthesis process, and intrinsic defects -F-centres and F2-centres luminescence. Other authors also have noted, that impurity metals are present as contaminants in the strontium aluminate lattice, regardless of the preparation method [82] and that means they can also be responsible for trapping centre generation.…”

Section: Intrinsic Defect Role In the Persistent Luminescence Mechanismmentioning

confidence: 98%

Recent progress in understanding the persistent luminescence in SrAl₂O₄:Eu,Dy

Vitola

Millers

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et al. 2019

Materials Science and Technology

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Ever since the discovery of SrAl2O4:Eu,Dy persistent afterglow material, that can intensively glow up to 20 h, the mechanism of long-lasting luminescence has been a popular area of research. The research is focused on discovering the mechanism of persistent luminescence in order to prolong the duration and intensity of afterglow in a controlled way. Although most researchers agree on the general things, there are still many unclarities and ambiguities to discuss upon. This review paper briefly sketches in the highlights of past research on the luminescence mechanism in SrAl2O4:Eu,Dy, mainly focusing on the research conducted in the past decade dedicated to clearing these ambiguities. This paper provides an overview of the latest persistent luminescence mechanisms offered by researchers.

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“…After UV irradiation, the [AlO4 0 ] signals decay much faster, while the signals at g=2.007 (trapped hole) and 1.999 (trapped electron) decay very slowly (about 50% intensity loss after 12 h). Boutinaud et al observed also that transition metal impurities (Mn 2+ ,Mn 4+ , Cr 3+ and Fe 3+ ) can contribute to the EPR spectra observed in nominally undoped SA [299]. Vitola et al [294] observed at 10K in undoped SA two emission bands at 435 and 510 nm which were excited at 229 nm and 246 nm.…”

Section: Sr3amentioning

confidence: 96%