X-ray excited luminescence of SrAl2O4:Eu,Dy at low temperatures

Liepina, Virginija; Millers, D.; Šmits, Krišjānis; Zolotarjovs, Aleksejs; Bite, Ivita

doi:10.1016/j.jpcs.2017.12.040

Cited by 18 publications

(10 citation statements)

References 26 publications

(60 reference statements)

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“…The electronhole pairs were created in SrAl2O4 under Xray irradiation and at low temperatures these charge carriers could be trapped, thus the TSL measurements were conducted. The TSL curves show a well resolved maximum at 100 K, that appears also in the SrAl2O4: Eu, Dy and SrAl2O4: Dy material [31]. This can be attributed to the electrons release from intrinsic defects of the SrAl2O4 crystal.…”

Section: +mentioning

confidence: 74%

“…This can be attributed to the electrons release from intrinsic defects of the SrAl2O4 crystal. The weak glow peak was at ∼260 K, at the same temperature the glow peak is in the rare earth doped SrAl2O4 [31]. The third well resolved peak is located above RT at around 400 K. This is also visible in the Eu and Dy doped material [31,32], although this peak is slightly shifted to lower temperatures when adding the dopants.…”

Section: +mentioning

confidence: 78%

“…The weak glow peak was at ∼260 K, at the same temperature the glow peak is in the rare earth doped SrAl2O4 [31]. The third well resolved peak is located above RT at around 400 K. This is also visible in the Eu and Dy doped material [31,32], although this peak is slightly shifted to lower temperatures when adding the dopants. As glow peaks at the similar temperatures were observed in rare earth doped and undoped SrAl2O\4, we would like to state that the defects that act as trapping centers in the long lasting luminescence of SrAl2O4: Eu, Dy are intrinsic defects nearby to dopant, not the dopant impurities directly.…”

Section: +mentioning

confidence: 78%

“…As glow peaks at the similar temperatures were observed in rare earth doped and undoped SrAl2O\4, we would like to state that the defects that act as trapping centers in the long lasting luminescence of SrAl2O4: Eu, Dy are intrinsic defects nearby to dopant, not the dopant impurities directly. The Dy codoping clearly shifts the TLS peak at 400 K to lower temperature [31], suggesting that intrinsic defects could be perturbed by dopant or by trace impurities, thus contributing to more intensive afterglow.…”

Section: +mentioning

confidence: 99%

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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: +mentioning

confidence: 74%

Section: +mentioning

confidence: 78%

Section: +mentioning

confidence: 78%

Section: +mentioning

confidence: 99%

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The search for defects in undoped SrAl2O4 material

et al. 2019

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“…4,5 Recently, the SrAl 2 O 4 :Eu 2+ , Dy 3+ phosphor has received considerable research attention because of its stability and environmentally friendly properties, with various applications such as emergency signage, watch dials, luminous paints, traffic signs, and children's toys. [6][7][8][9][10] There are many techniques to manufacture strontium aluminate, such as sol-gel synthesis, 7 continuous solid-phase synthesis, 11 combustion, 12 and hightemperature solid-state method. 13 The high-temperature solidstate method synthesizes the phosphor with the highest crystallinity.…”

Section: Introductionmentioning

confidence: 99%