TY - JOUR
T1 - CsBa2I5:Eu2+,Sm2+—The First High-Energy Resolution Black Scintillator for γ-Ray Spectroscopy
AU - Wolszczak, Weronika
AU - Krämer, Karl W.
AU - Dorenbos, Pieter
PY - 2019
Y1 - 2019
N2 - 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:Eu2+ and CsBa2I5:Eu2+. However, the resolution is still limited because of unavoidable self-absorption of Eu2+ emission, especially when large-sized scintillators are to be used. By co-doping with Sm2+, the emission of Eu2+ 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:Eu2+ 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.
AB - 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:Eu2+ and CsBa2I5:Eu2+. However, the resolution is still limited because of unavoidable self-absorption of Eu2+ emission, especially when large-sized scintillators are to be used. By co-doping with Sm2+, the emission of Eu2+ 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:Eu2+ 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.
KW - crystal growth
KW - CsBaI
KW - luminescent materials
KW - radiation detection
KW - scintillators
UR - http://www.scopus.com/inward/record.url?scp=85067689840&partnerID=8YFLogxK
U2 - 10.1002/pssr.201900158
DO - 10.1002/pssr.201900158
M3 - Article
AN - SCOPUS:85067689840
SN - 1862-6254
VL - 13
JO - Physica Status Solidi - Rapid Research Letters
JF - Physica Status Solidi - Rapid Research Letters
IS - 9
M1 - 1900158
ER -