Afterglow suppression and non-radiative charge-transfer in CsI:Tl,Sm

POSTER

Abstract

The feasibility of substantially diminishing afterglow in CsI:Tl scintillator material by co-doping with Sm$^{2+}$ is demonstrated. Rate equations informed by experiment predict that deep samarium electron traps scavenge electrons from shallow thallium traps. In addition, combined radioluminescence and thermoluminescence experiments on a sample of CsI:Tl,Sm with nominal concentrations of 0.11{\%} Tl$^{2+}$ and 0.2{\%} Sm$^{2+}$ suggest that electrons released by samarium recombine non-radiatively with holes trapped as $V_{KA}$(Tl$^{+})$ centers, thus providing a mechanism for suppression of trapped-charge accumulation in repetitive applications. A linear-coupling model in the harmonic approximation, based on quantum chemistry calculations with selective lattice relaxation, supports the conclusion that non-radiative charge-transfer is enabled by low-energy excited states of Sm$^{2+}$.

Authors

  • Lawrence Kappers

    Physics Department, University of Connecticut, Storrs, CT, University of Connecticut

  • V.E. Guiseppe

    University of Connecticut, Univ. of New Hampshire, Sandia National Labs, IBM Research Center, PTB, TUNL, Petersburg Nuc. Phys. Inst., Yale Univ., U.S. Coast Guard Acad., Department of Physics, University of Connecticut, Storrs, CT 06269-3046, Physics Department, Carnegie Mellon University, Pittsburgh, PA 15213, Division of Proton Engineering Frontier Project, Korea Atomic Energy Research Institute, Daejeon, Korea, Department of Chemistry, Sogang University, Seoul, Korea, Materials Science Department, Brookhaven National Lab, Upton, NY 11973, Canadian Light Source, University of Saskatchewan, Saskatoon, Canada, Department of Physics, University of Connecticut, Storrs, CT 06269, RMD Inc., Watertown, MA, ALEM Associates, Boston, MA, Physics Department, University of Connecticut, Storrs, CT, University of South Dakota, LANL

  • V.E. Guiseppe

    University of Connecticut, Univ. of New Hampshire, Sandia National Labs, IBM Research Center, PTB, TUNL, Petersburg Nuc. Phys. Inst., Yale Univ., U.S. Coast Guard Acad., Department of Physics, University of Connecticut, Storrs, CT 06269-3046, Physics Department, Carnegie Mellon University, Pittsburgh, PA 15213, Division of Proton Engineering Frontier Project, Korea Atomic Energy Research Institute, Daejeon, Korea, Department of Chemistry, Sogang University, Seoul, Korea, Materials Science Department, Brookhaven National Lab, Upton, NY 11973, Canadian Light Source, University of Saskatchewan, Saskatoon, Canada, Department of Physics, University of Connecticut, Storrs, CT 06269, RMD Inc., Watertown, MA, ALEM Associates, Boston, MA, Physics Department, University of Connecticut, Storrs, CT, University of South Dakota, LANL

  • V.E. Guiseppe

    University of Connecticut, Univ. of New Hampshire, Sandia National Labs, IBM Research Center, PTB, TUNL, Petersburg Nuc. Phys. Inst., Yale Univ., U.S. Coast Guard Acad., Department of Physics, University of Connecticut, Storrs, CT 06269-3046, Physics Department, Carnegie Mellon University, Pittsburgh, PA 15213, Division of Proton Engineering Frontier Project, Korea Atomic Energy Research Institute, Daejeon, Korea, Department of Chemistry, Sogang University, Seoul, Korea, Materials Science Department, Brookhaven National Lab, Upton, NY 11973, Canadian Light Source, University of Saskatchewan, Saskatoon, Canada, Department of Physics, University of Connecticut, Storrs, CT 06269, RMD Inc., Watertown, MA, ALEM Associates, Boston, MA, Physics Department, University of Connecticut, Storrs, CT, University of South Dakota, LANL

  • V.E. Guiseppe

    University of Connecticut, Univ. of New Hampshire, Sandia National Labs, IBM Research Center, PTB, TUNL, Petersburg Nuc. Phys. Inst., Yale Univ., U.S. Coast Guard Acad., Department of Physics, University of Connecticut, Storrs, CT 06269-3046, Physics Department, Carnegie Mellon University, Pittsburgh, PA 15213, Division of Proton Engineering Frontier Project, Korea Atomic Energy Research Institute, Daejeon, Korea, Department of Chemistry, Sogang University, Seoul, Korea, Materials Science Department, Brookhaven National Lab, Upton, NY 11973, Canadian Light Source, University of Saskatchewan, Saskatoon, Canada, Department of Physics, University of Connecticut, Storrs, CT 06269, RMD Inc., Watertown, MA, ALEM Associates, Boston, MA, Physics Department, University of Connecticut, Storrs, CT, University of South Dakota, LANL

  • V.E. Guiseppe

    University of Connecticut, Univ. of New Hampshire, Sandia National Labs, IBM Research Center, PTB, TUNL, Petersburg Nuc. Phys. Inst., Yale Univ., U.S. Coast Guard Acad., Department of Physics, University of Connecticut, Storrs, CT 06269-3046, Physics Department, Carnegie Mellon University, Pittsburgh, PA 15213, Division of Proton Engineering Frontier Project, Korea Atomic Energy Research Institute, Daejeon, Korea, Department of Chemistry, Sogang University, Seoul, Korea, Materials Science Department, Brookhaven National Lab, Upton, NY 11973, Canadian Light Source, University of Saskatchewan, Saskatoon, Canada, Department of Physics, University of Connecticut, Storrs, CT 06269, RMD Inc., Watertown, MA, ALEM Associates, Boston, MA, Physics Department, University of Connecticut, Storrs, CT, University of South Dakota, LANL

  • V.E. Guiseppe

    University of Connecticut, Univ. of New Hampshire, Sandia National Labs, IBM Research Center, PTB, TUNL, Petersburg Nuc. Phys. Inst., Yale Univ., U.S. Coast Guard Acad., Department of Physics, University of Connecticut, Storrs, CT 06269-3046, Physics Department, Carnegie Mellon University, Pittsburgh, PA 15213, Division of Proton Engineering Frontier Project, Korea Atomic Energy Research Institute, Daejeon, Korea, Department of Chemistry, Sogang University, Seoul, Korea, Materials Science Department, Brookhaven National Lab, Upton, NY 11973, Canadian Light Source, University of Saskatchewan, Saskatoon, Canada, Department of Physics, University of Connecticut, Storrs, CT 06269, RMD Inc., Watertown, MA, ALEM Associates, Boston, MA, Physics Department, University of Connecticut, Storrs, CT, University of South Dakota, LANL

  • V.E. Guiseppe

    University of Connecticut, Univ. of New Hampshire, Sandia National Labs, IBM Research Center, PTB, TUNL, Petersburg Nuc. Phys. Inst., Yale Univ., U.S. Coast Guard Acad., Department of Physics, University of Connecticut, Storrs, CT 06269-3046, Physics Department, Carnegie Mellon University, Pittsburgh, PA 15213, Division of Proton Engineering Frontier Project, Korea Atomic Energy Research Institute, Daejeon, Korea, Department of Chemistry, Sogang University, Seoul, Korea, Materials Science Department, Brookhaven National Lab, Upton, NY 11973, Canadian Light Source, University of Saskatchewan, Saskatoon, Canada, Department of Physics, University of Connecticut, Storrs, CT 06269, RMD Inc., Watertown, MA, ALEM Associates, Boston, MA, Physics Department, University of Connecticut, Storrs, CT, University of South Dakota, LANL