ES-SAKHI, B.; GARCIA, Alain; STRUYE, L.; WILLEMS, P.; LEBLANS, P.; MOUDDEN, A.; FOUASSIER, Claude

doi:10.1016/S0921-5107(02)00327-6

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ES-SAKHI, B.
Université Ibn Zhor

GARCIA, Alain
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

STRUYE, L.
Agfa-Gevaert

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Materials Science and Engineering: B. 2003, vol. 96, n° 3, p. 233-239

Elsevier

Résumé en anglais

The luminescence of Eu2+ has been investigated in two families of BaF2-rich fluorohalides, Ba12Cl5(1−x)Br5xF19 (x≤0.8) and Ba7Cl2(1−x)Br2xF12 (x≤0.5). In the two kinds of host lattices, under UV excitation Eu2+ shows an intense blue 5d→4f band emission at 300 K. At low temperature, in addition to the latter, 4f→4f lines are present in the near UV. The efficiency of the photostimulated luminescence (PSL) after X-ray irradiation has been measured and compared with that of BaXF:Eu (X=Cl, Br). High conversion efficiencies have been obtained with compositions Ba12Cl5(1−x)Br5xF19 for stimulation at 532 nm. The presence of bromine is beneficial. For all compositions a high stimulation energy (SE) is needed to excite Eu2+ ions through colour centres.< Réduire

Mots clés en anglais

Photoluminescence

Photostimulation

Storage phosphors

Eu2+-doped barium chlorofluoride

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Photoluminescence of Eu2+ in BaF2-rich fluorohalides and photostimulation after X-ray irradiation

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