Wavelength dependent loading of traps in the persistent phosphor SrAl2O4:Eu2+, Dy3+

Hagemann, Hans‐Rudolf; Lovy, Dominique; Yoon, Seock Jun; Gartmann, Nando; Walfort, Bernhard; Bierwagen, Jakob

doi:10.1016/j.jlumin.2015.10.035

Cited by 36 publications

(45 citation statements)

References 21 publications

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“…For measuring the brightness of the samples, they were mounted in a home built thermoluminescent setup described elsewhere [10]. The samples (typically a 13 mm diameter and 1 mm thick pellet composed of 100 mg of phosphor with 300 mg KBr), were attached to a sample holder which can be cooled with a stream of cold nitrogen-gas and heated with a heating cartridge.…”

Section: Thermal Dependent Brightness Measurementsmentioning

confidence: 99%

Thermal and concentration dependent energy transfer of Eu^2+ in SrAl_2O_4

Bierwagen

Yoon

Gartmann³

et al. 2016

Opt. Mater. Express

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SrAl 2 O 4 doped with europium and dysprosium is a powerful and widely used afterglow material. Within this material strontium is found in two crystallographic different sites. Due to the similar ion radii and same charge, Eu 2+ -ions can occupy both sites, resulting in two different Eu 2+ -ions, one emitting in the blue and one in the green spectral range. The blue emission is thermally quenched at room temperature. In this paper we investigate the energy transfer between different Eu ions depending on the concentration and temperature using two different approaches: lifetime measurements and integrated intensity. We find an activation energy for the thermal quenching of the blue emission of 0.195 ± 0.023 eV and a critical radius for the energy transfer of 3.0 ± 0.5 nm. These results can help in designing better afterglow materials due to the fact that with energy transfer parts of the lost emission in the blue region at room temperature can be converted to the green site.

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Section: Thermal Dependent Brightness Measurementsmentioning

confidence: 99%

Thermal and concentration dependent energy transfer of Eu^2+ in SrAl_2O_4

Bierwagen

Yoon

Gartmann³

et al. 2016

Opt. Mater. Express

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“…The released electrons recombine with Eu 3þ ion, thus resulting in excited Eu 2þ creation. The following radiative transition to the Eu 2þ ground state is the origin of the green luminescence observed [8,12,13]. However, in addition to thermally stimulated process, the creation of excited Eu 2þ luminescence center via electron tunneling was observed recently as well [14].…”

Section: Introductionmentioning

confidence: 99%

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

Liepina

Millers

Šmits

et al. 2018

Journal of Physics and Chemistry of Solids

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“…The field of persistent luminescent materials gained importance with the discovery of SrAl

_{2}

_{4}

:Eu,Dy by Matsuzawa et al [1], replacing ZnS:Cu,Co [2] as the benchmark afterglow phosphor. This green emitting phosphor shows afterglow for several hours after the excitation has stopped, and has been extensively investigated [3,4,5]. Two decades after the discovery by Matsuzawa et al, the list of afterglow phosphors has grown, and in addition to the alkaline earth aluminates it now also includes, among others, silicates and sulfides doped with a wide variety of activators, such as Eu

^{2 +}

[6], Ce

^{3 +}

[7,8] or transition metal ions [9].…”

Section: Introductionmentioning

confidence: 99%

Counting the Photons: Determining the Absolute Storage Capacity of Persistent Phosphors

et al. 2017

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The performance of a persistent phosphor is often determined by comparing luminance decay curves, expressed in cd/m2. However, these photometric units do not enable a straightforward, objective comparison between different phosphors in terms of the total number of emitted photons, as these units are dependent on the emission spectrum of the phosphor. This may lead to incorrect conclusions regarding the storage capacity of the phosphor. An alternative and convenient technique of characterizing the performance of a phosphor was developed on the basis of the absolute storage capacity of phosphors. In this technique, the phosphor is incorporated in a transparent polymer and the measured afterglow is converted into an absolute number of emitted photons, effectively quantifying the amount of energy that can be stored in the material. This method was applied to the benchmark phosphor SrAl2O4:Eu,Dy and to the nano-sized phosphor CaS:Eu. The results indicated that only a fraction of the Eu ions (around 1.6% in the case of SrAl2O4:Eu,Dy) participated in the energy storage process, which is in line with earlier reports based on X-ray absorption spectroscopy. These findings imply that there is still a significant margin for improving the storage capacity of persistent phosphors.

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Wavelength dependent loading of traps in the persistent phosphor SrAl2O4:Eu2+, Dy3+

Cited by 36 publications

References 21 publications

Thermal and concentration dependent energy transfer of Eu^2+ in SrAl_2O_4

Thermal and concentration dependent energy transfer of Eu^2+ in SrAl_2O_4

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

Counting the Photons: Determining the Absolute Storage Capacity of Persistent Phosphors

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