Eu<sup>2+</sup>luminescence in strontium aluminates

Dutczak, Danuta; Jüstel, Thomas; Ronda, Cees; Meijerink, Andries

doi:10.1039/c5cp01095k

Cited by 159 publications

(134 citation statements)

References 73 publications

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“…The XRD shows characteristic peaks of the SrAl 2 O 4 monoclinic polymorph (space group P2 1 ) 17 , whose pattern is characterized by three peaks centered in the 2θ range from 28° to 30° and matched with the SrAl 2 O 4 standard values given in JCPDS (No. 34-0379) and their coexistence with SrAl 2 O 4 hexagonal polymorph (space group P6 3 22), which exhibits a main peak at 2θ = 29.06°.…”

Section: Resultssupporting

confidence: 53%

Precise Tuning of the Nanostructured Surface leading to the Luminescence Enhancement in SrAl2O4 Based Core/Shell Structure

Rojas-Hernández

Rubio-Marcos

Serrano

et al. 2017

Sci Rep

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Intensive research has been focused on the synthesis of long-lasting SrAl2O4:EuDy in luminescent materials field. Traditionally, SrAl2O4:EuDy is synthesized in bulk form by solid state. However, their development remains restrained due to this technique is not compatible with large-scale production, sustainability and nanometer-scale requirements. Despite nano-range particles have been obtained by chemical routes, photoluminescence response decreases and application became unpractical. It remains a challenge to synthesize nonrare-earth (RE) phosphors with high photoluminescence. One major challenge for the luminescent materials community is to devise methods to deliver innovative, sustainable and cost effective solutions for the reduction of RE because of the lack of RE availability. Here, we suggest a solution based on molten salts, obtaining nanosheets or micro/nanostructured SrAl2O4:Eu, Dy particles with core-shell structure, employing only 50% of standard amounts of RE. Core-size and shell thickness and crystallinity can be tuned by post-thermal treatment, through which can be modulated the Eu+2 fraction. We find that our methodology leads the functional features of the analogous micron counterpart. These results can be considered a great achievement to scale-up the process. Besides, the harmful collateral effect of nanotechnology must be addressed by using new safe by design core-shell nanostructures.

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Section: Resultssupporting

confidence: 53%

Precise Tuning of the Nanostructured Surface leading to the Luminescence Enhancement in SrAl2O4 Based Core/Shell Structure

Rojas-Hernández

Rubio-Marcos

Serrano

et al. 2017

Sci Rep

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“…(6). The volume V of the unit-cell of SrAl 2 O 4 is 0.384 nm 3 . Within this volume n = 2 formula units are incorporated and the structure has m = 2 inequivalent Sr sites.…”

Section: Kinetic Modelmentioning

confidence: 99%

“…In SrAl 2 O 4 doped with 1% Eu 2+ they found the lifetime of the blue and green emitting europium at 4 K at 0.4 μs and 1.2 μs respectively. At room temperature they measured the lifetime of the green emission with 0.7 μs [3]. Besides this they also measured the temperature dependence of the luminescence intensity of the blue and green emission between 4 and 500 K of sample doped with 0.1% Eu 2+ .…”

Section: Introductionmentioning

confidence: 99%

“…At room temperature (295 K) they found a multi exponential decay time of 0.73 μs for the green emission, whereas the blue emission was not detectable. Dutczak et al [3] investigated a large variety of different strontium aluminates doped with Eu 2+ . In SrAl 2 O 4 doped with 1% Eu 2+ they found the lifetime of the blue and green emitting europium at 4 K at 0.4 μs and 1.2 μs respectively.…”

Section: Introductionmentioning

confidence: 99%

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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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“…1 Recently, the luminescence wavelength of persistent phosphors has extended from visible light to near-infrared (NIR), [2][3][4][5][6] which is suitable for in vivo bioimaging due to the reduced scattering and minimal absorption coefficient when compared with visible light, allowing imaging of deep tissues. Furthermore, persistent phosphors in the form of nano-particles charged by ultraviolet (UV) light (visible light in rare cases) before injecting into small animals can emit NIR persistent luminescence (PersL) for minutes to even hours without further in situ excitation.…”

Section: Introductionmentioning

confidence: 99%

Near-infrared long persistent luminescence of Er³⁺ in garnet for the third bio-imaging window

Murata

Ueda

et al. 2016

J. Mater. Chem. C

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Eu²⁺luminescence in strontium aluminates

Cited by 159 publications

References 73 publications

Precise Tuning of the Nanostructured Surface leading to the Luminescence Enhancement in SrAl2O4 Based Core/Shell Structure

Precise Tuning of the Nanostructured Surface leading to the Luminescence Enhancement in SrAl2O4 Based Core/Shell Structure

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

Near-infrared long persistent luminescence of Er³⁺ in garnet for the third bio-imaging window

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Eu2+luminescence in strontium aluminates

Cited by 159 publications

References 73 publications

Precise Tuning of the Nanostructured Surface leading to the Luminescence Enhancement in SrAl2O4 Based Core/Shell Structure

Precise Tuning of the Nanostructured Surface leading to the Luminescence Enhancement in SrAl2O4 Based Core/Shell Structure

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

Near-infrared long persistent luminescence of Er3+ in garnet for the third bio-imaging window

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Eu²⁺luminescence in strontium aluminates

Near-infrared long persistent luminescence of Er³⁺ in garnet for the third bio-imaging window