Preparation and optical properties of BaFCl:Eu2+ X-ray storage phosphor

Secu, M.; Matei, Lidia; Serban, T.; Apostol, E.; Aldica, G.; C, Silion

doi:10.1016/s0925-3467(00)00022-7

Cited by 27 publications

(11 citation statements)

References 9 publications

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“…In the XL spectra (not shown) we have observed the same 385 nm luminescence associated to Eu 2+ . We have observed that the PSL signal can be bleached by illumination for several minutes in the Fcentre absorption band near 560nm, showing two exponential decay stages [5]. After the bleaching the diffuse reflectance peaks decrease almost completely (Fig.…”

Section: A) B)mentioning

confidence: 83%

“…The 408 K and 524 K TL peaks show only a partial decrease of only about 20% compared to the 470 K TL peak which shows a drastic decrease of about 80%. At the same time the 646 K TL peak disappears and is replaced by a new TL peak at about 655 K [5]. The percentages have been evaluated from the amplitudes of the individual peaks obtained from the TL curves deconvolution.…”

Section: A) B)mentioning

confidence: 99%

“…PSL, X-ray excited luminescence (XL) and diffuse reflectance. 2 Experimental details Europium doped BaFCl polycrystalline powders were prepared by a coprecipitation method; the europium impurity has been added as EuF 2 at a concentration of about 200 ppm/mol [5]. In order to complete the chemical reactions and to improve the material homogeneity the samples were pressed and then thermally treated in vacuum below the melting temperature [5].…”

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confidence: 99%

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High temperature thermoluminescence of BaFCl:Eu²⁺ X‐ray storage phosphor

Secu

Predoi

2007

Phys. Status Solidi (c)

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Thermoluminescence (TL) of Eu2+ -doped BaFCl polycrystalline powders X-ray irradiated at room temperature show several TL peaks at 364 K, 408 K, 470 K, 524 K and 646 K. Thermally activated recombination processes responsible for TL have been studied using complementary techniques as TL and its bleaching, diffuse reflectance, X-ray excited luminescence (XL) and photostimulated luminescence (PSL). Experimental results indicate that F(Cl -) centres are the dominant electron trap centres, the Eu 2+ -trapped hole aggregate centres playing the role of recombination centres. The 470 K and 646 K TSL glow peaks are assigned to the recombination inside the triple aggregates (Eu 2+ -hole centre -F(Cl -) centre). The remaining 408 K and 524 K TL peaks are tentatively assigned to recombination between F centres and double aggregates (Eu 2+ -hole centre).

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Section: A) B)mentioning

confidence: 83%

Section: A) B)mentioning

confidence: 99%

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confidence: 99%

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High temperature thermoluminescence of BaFCl:Eu²⁺ X‐ray storage phosphor

Secu

Predoi

2007

Phys. Status Solidi (c)

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“…Usually, the zero phonon line is defined as the intersection of the normalized absorption with the emission spectrum (416 nm, 2.9804 eV) [11]. According to the above definition, the Stokes shift for BAS:Eu 2+ was calculated to be 0.7589 eV.…”

Section: Luminescent Characteristicsmentioning

confidence: 99%

Thermal degradation of BaAl2Si2O8:Eu2+ phosphor excited by near ultraviolet light

Zhu

Zhao

et al. 2012

Chin. Sci. Bull.

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1 excited state configuration [5,6]. Emission is strongly dependent on the crystal fields of the host lattices because 5d orbitals are sensitive to the ligand field. Therefore, the choice of host affects the optical properties of Eu 2+ ions significantly. Aluminosilicate is well known as a long-persistent phosphor host with high chemical stability and water resistance. In alkaline-earth feldspars MAl 2 Si 2 O 8 (M=Ca, Sr, Ba), the framework structures are formed from an array of interlinked corner-sharing tetrahedral SiO 4 and AlO 4 species, with charge-compensating cations Ca 2+ , Sr 2+ , and Ba 2+ occupying large cavities within the structure [7]. A series of solid solutions containing isostructural members with slightly different size cations as hosts [such as MAl 2 Si 2 O 8 (M=Ca, Sr, Ba)] would be an ideal system to study the effect of crystal chemical variation on the luminescence of Eu 2+ ions, and may offer possibilities for commercial application [8].Because the ability to withstand high temperature is required for phosphors in near-UV LEDs [9], the temperature-dependent luminescence properties of phosphors have attracted great attention. In this paper, the thermal degradation mechanism of BaAl 2 Si 2 O 8 :Eu 2+ (BAS: Eu 2+ ) is explored. The lifetime and CIE chromaticity coordinates of BAS:Eu 2+ are also investigated.

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“…However, most of the currently available literature about Eu 2+ ‐activated BaFCl report about the synthesis and characterization of micrometer‐sized crystals . These so‐called bulk phosphors are usually prepared by means of solid‐state reactions, requiring high temperatures and long reaction times.…”

Section: Introductionmentioning

confidence: 99%

Facile Ionic Liquid‐Assisted Strategy for Direct Precipitation of Eu²⁺‐Activated Nanophosphors under Ambient Conditions

Terraschke

Olchowka

Geringer

et al. 2018

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This work describes a novel ionic liquid (IL)-assisted synthesis strategy for a direct and easy production of Eu -doped nanoparticles (NPs), where ILs are also used as fluoride sources to avoid the use of elemental fluorine or toxic hydrofluoric acid. Up to now, the direct synthesis of Eu -doped nanophosphors consisted of an enormous challenge, due to the oxidation to Eu observed in hydrous solution, which is commonly used for the preparation of NPs, generating lattice defects and undesired particle growth or agglomeration by additional reducing steps at high temperatures. In contrast, ILs, unless containing ClO or NO anions, do not present an oxidizing character, allowing the direct precipitation of NPs, e.g., using Eu containing starting materials. Here, the undoped and Eu -doped BaFCl NPs have been prepared under atmospheric conditions for the first time using ILs as solvents and also as fluoride source, applying sonochemical and microwave-assisted approaches. In general, this method bears an enormous potential for an easy synthesis of fluoride materials compared to inconvenient solid-state methods. In addition, the IL plays the role of a strongly attached protecting shell which represents ≈7-8% of the total NPs weight.

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Preparation and optical properties of BaFCl:Eu2+ X-ray storage phosphor

Cited by 27 publications

References 9 publications

High temperature thermoluminescence of BaFCl:Eu²⁺ X‐ray storage phosphor

High temperature thermoluminescence of BaFCl:Eu²⁺ X‐ray storage phosphor

Thermal degradation of BaAl2Si2O8:Eu2+ phosphor excited by near ultraviolet light

Facile Ionic Liquid‐Assisted Strategy for Direct Precipitation of Eu²⁺‐Activated Nanophosphors under Ambient Conditions

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Preparation and optical properties of BaFCl:Eu2+ X-ray storage phosphor

Cited by 27 publications

References 9 publications

High temperature thermoluminescence of BaFCl:Eu2+ X‐ray storage phosphor

High temperature thermoluminescence of BaFCl:Eu2+ X‐ray storage phosphor

Thermal degradation of BaAl2Si2O8:Eu2+ phosphor excited by near ultraviolet light

Facile Ionic Liquid‐Assisted Strategy for Direct Precipitation of Eu2+‐Activated Nanophosphors under Ambient Conditions

Contact Info

Product

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High temperature thermoluminescence of BaFCl:Eu²⁺ X‐ray storage phosphor

High temperature thermoluminescence of BaFCl:Eu²⁺ X‐ray storage phosphor

Facile Ionic Liquid‐Assisted Strategy for Direct Precipitation of Eu²⁺‐Activated Nanophosphors under Ambient Conditions