Abstract
Recently, we proposed a concept for a new class of near infrared (NIR) scintillators by employing efficient Eu2+ → Sm2+ energy transfer. In this article we investigate the optical spectroscopy of Sm2+ in BaBrI, CsSrI3, and CsBa2I5 halide hosts. A criterion was derived for fast Sm2+ 5d → 4f emission and a list of new potential NIR scintillators is proposed.
Highlights
Scintillators are important materials for the detection of ionizing radiation [1,2,3]
In this article we explore the potential of parity-allowed 5d → 4f transitions of Sm2þ for developing new scintillators with efficient energy transfer between europium and samarium
We present the spectroscopic characterization of BaBrI: Eu2þ,Sm2þ, CsBa2I5:Eu2þ,Sm2þ, and CsSrI3:Eu2þ,Sm2þ and derive a criterion for fast Sm2þ 5d → 4f emission in a host lattice
Summary
Scintillators are important materials for the detection of ionizing radiation [1,2,3]. They can absorb a high energy particle and down-convert its energy into a short pulse of (visible) light. The re-absorption of Eu2þ luminescence by other Eu2þ atoms (self-absorption) is detrimental to the scintillation process in large crystals required for γ-spectroscopy. It affects decay time, light yield, and energy resolution [11]. Besides limiting the self-absorption, shifting the emission wavelength to the near infrared NIR can be a way to an energy resolu tion better than 2% [16]
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