Abstract
Luminescence and scintillation properties of Eu2+- and Ce3+-doped TlSr2Cl5 crystals are reported for large effective atomic number (Zeff = 63.7) that have potential applications in X-ray and gamma ray detection. We have previously developed TlSr2Cl5 crystalline scintillators. To improve the scintillation properties of TlSr2Cl5, Ce3+ and Eu2+ were doped into the crystals in this study. The scintillation emission bands of Eu2+-doped TlSr2Cl5 were observed at 420 nm and those for Ce3+-doped TlSr2Cl5 were observed at 380, 450, and 500 nm. Band peaks at 450 and 500 nm were similar to those of undoped TlSr2Cl5, which are characteristic of self-activated thallium-based chloride crystals. The light yields of Ce3+- and Eu2+-doped TlSr2Cl5 were estimated to be approximately 16,000 and 21,000 photons/MeV, respectively. The light yield of Eu2+-doped TlSr2Cl5 is higher than that of undoped TlSr2Cl5 crystals (19,000 photons/MeV). It was suggested that Eu2+ is more suitable dopant for TlSr2Cl5 than Ce3+. The higher light yield of Eu2+-doped TlSr2Cl5 is due to the emissions by Eu2+ ions, which makes it easier to distinguish peaks from noise and improve the energy resolution.
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