Optical properties and defect structure of Sr2+ co-doped LaBr3:5%Ce scintillation crystals

Alekhin, Mikhail S.; Weber, Sandra; Krämer, Karl; Dorenbos, Pieter (2014). Optical properties and defect structure of Sr2+ co-doped LaBr3:5%Ce scintillation crystals. Journal of luminescence, 145, pp. 518-524. Amsterdam: North-Holland 10.1016/j.jlumin.2013.08.019

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Sr2+ co-doped LaBr3:5%Ce scintillators show a record low energy resolution of 2% at 662 keV and a considerably better proportional response compared to standard LaBr3:5%Ce. This paper reports on the optical properties and time response of Sr co-doped LaBr3:5%Ce. Multiple excitation and emission bands were observed in X-ray and optically excited luminescence measurements. Those bands are ascribed to three different Ce3+ sites. The first is the unperturbed site with the same luminescence properties as those of standard LaBr3:Ce. The other two are perturbed sites with red-shifted 4f-5d1 Ce3+ excitation and emission bands, longer Ce3+ decay times, and smaller Stokes shifts. The lowering of the lowest 5d level of Ce3+ was ascribed to larger crystal field interactions at the perturbed sites. Two types of point defects in the LaBr3 matrix were proposed to explain the observed results. No Ce4+ ions were detected in Sr co-doped LaBr3:5%Ce by diffuse reflectance measurements.

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