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Biner, Daniel A.
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article
Light yield and thermal quenching of Ce3+ and Pr3+ co-doped LaBr3:Sm2+ near-infrared scintillators
Abstract
<p>LaBr<sub>3</sub>:Ce<sup>3+</sup> is a compound with excellent scintillation properties, but its ultraviolet emission does not match well with the detection efficiency curves of silicon based photodetectors. In this work, Sm<sup>2+</sup> is studied as an activator for LaBr<sub>3</sub> as its near-infrared emission can be detected with close to 100% efficiency by such photodetectors. LaBr<sub>3</sub>:Sm<sup>2+</sup> single crystals were grown with and without co-doping of Ce<sup>3+</sup> or Pr<sup>3+</sup>. The samples were studied by means of X-ray excited and photoluminescence spectroscopy at temperatures between 10 K and 300 K. Their spectroscopic properties are compared to LaBr<sub>3</sub>:Ce<sup>3+</sup> and LaBr<sub>3</sub>:Eu<sup>2+</sup>. The effect of using Ce<sup>3+</sup> or Pr<sup>3+</sup> as scintillation sensitiser for Sm<sup>2+</sup> is assessed. It is found that energy transfer from host to Sm<sup>2+</sup> greatly improves upon Ce<sup>3+</sup> co-doping, but the quenching temperature of the Sm<sup>2+</sup> emission decreases. The quenching mechanism of both the Ce<sup>3+</sup> and Sm<sup>2+</sup> emission in LaBr<sub>3</sub> is elaborated on. Furthermore, the effect of charge compensating defects on the light yield and spectroscopic properties is discussed.</p>