We employ a combination of first-principles calculations and optical characterization experiments to explain the mechanism by which Ga3+ doping prevents the trapping of free carriers due to shallow traps in RE 3Al5O12 garnet scintillators (where RE represents a 3+ rare-earth cation). Specifically, we confirm that Ga3 + doping does not reduce the defect concentration (defect engineering), but rather leads to shifts in the valence and conduction bands such that the energy level of shallow defects is no longer in the forbidden gap where electrons can be trapped (band-gap engineering).

Fasoli, M., Vedda, A., Nikl, M., Jiang, C., Uberuaga, B., Andersson, D., et al. (2011). Band-gap engineering for removing shallow traps in rare-earth Lu3Al5O12 garnet scintillators using Ga3+ doping. PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, 84(8) [10.1103/PhysRevB.84.081102].

Band-gap engineering for removing shallow traps in rare-earth Lu3Al5O12 garnet scintillators using Ga3+ doping

FASOLI, MAURO;VEDDA, ANNA GRAZIELLA;
2011

Abstract

We employ a combination of first-principles calculations and optical characterization experiments to explain the mechanism by which Ga3+ doping prevents the trapping of free carriers due to shallow traps in RE 3Al5O12 garnet scintillators (where RE represents a 3+ rare-earth cation). Specifically, we confirm that Ga3 + doping does not reduce the defect concentration (defect engineering), but rather leads to shifts in the valence and conduction bands such that the energy level of shallow defects is no longer in the forbidden gap where electrons can be trapped (band-gap engineering).
Articolo in rivista - Articolo scientifico
thermoluminescence; band-gap engineering; density functional calculation
English
2011
84
8
081102
none
Fasoli, M., Vedda, A., Nikl, M., Jiang, C., Uberuaga, B., Andersson, D., et al. (2011). Band-gap engineering for removing shallow traps in rare-earth Lu3Al5O12 garnet scintillators using Ga3+ doping. PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, 84(8) [10.1103/PhysRevB.84.081102].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/24523
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