CsBa 2 I 5 :Eu 2+ ,Sm 2+ —The First High‐Energy Resolution Black Scintillator for γ ‐Ray Spectroscopy

Wolszczak, Weronika; Krämer, Karl; Dorenbos, Pieter (2019). CsBa 2 I 5 :Eu 2+ ,Sm 2+ —The First High‐Energy Resolution Black Scintillator for γ ‐Ray Spectroscopy. Physica status solidi. Rapid research letters, 13(9), p. 1900158. Wiley 10.1002/pssr.201900158

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Scintillators are materials that absorb a high energy particle (α,β,γ radiation) and downconvert it into a short pulse of visible or near-visible light. As determined by photon detection statistics, the ultimate energy resolution for γ-photon detection can only be approached for materials that show a perfect proportional response with γ-energy. A large amount of research has resulted in the discovery of highly proportional materials, such as SrI2:Eu2þ and CsBa2I5:Eu2þ. However, the resolution is still limited because of unavoidable self-absorption of Eu2þ emission, especially when large-sized scintillators are to be used. By co-doping with Sm2þ, the emission of Eu2þ can be efficiently shifted to the far-red by exploiting nonradiative energy transfer. Herein, this new idea is applied to CsBa2I5, and Sm co-doped CsBa2I5:Eu2þ can be considered as the first “black scintillator” with an emission wavelength around 755 nm, a remarkable high energy resolution of 3.2% at 662 keV gamma excitation, and a scintillation decay time of 2.1 μs. The proposed double-doping principle can be used to develop an entirely new class of near-infrared (NIR) scintillators.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Departement of Chemistry and Biochemistry

UniBE Contributor:

Krämer, Karl

Subjects:

500 Science > 530 Physics
500 Science > 540 Chemistry

ISSN:

1862-6254

Publisher:

Wiley

Language:

English

Submitter:

Karl Krämer

Date Deposited:

02 Sep 2019 09:42

Last Modified:

23 Oct 2019 12:23

Publisher DOI:

10.1002/pssr.201900158

BORIS DOI:

10.7892/boris.132841

URI:

https://boris.unibe.ch/id/eprint/132841

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