Scintillation properties of Eu2+-doped KBa2I5 and K2BaI4

L. Stand; M. Zhuravleva; B. Chakoumakos; J. Johnson; A. Lindsey; Cl Melcher

doi:10.1016/j.jlumin.2015.09.013

Scintillation properties of Eu²⁺-doped KBa₂I₅ and K₂BaI₄

L. Stand, M. Zhuravleva, B. Chakoumakos, J. Johnson, A. Lindsey, Cl Melcher

Single Crystal Diffraction

Research output: Contribution to journal › Article › peer-review

27 Scopus citations

Abstract

We report two new ternary metal halide scintillators, KBa₂I₅ and K₂BaI₄, activated with divalent europium. Single crystal X-ray diffraction measurements confirmed that KBa₂I₅ has a monoclinic structure (P2₁/c) and that K₂BaI₄ has a rhombohedral structure (R3c). Differential scanning calorimetry showed singular melting and crystallization points, making these compounds viable candidates for melt growth. We grew 13 mm diameter single crystals of KBa₂I₅:Eu²⁺ and K₂BaI₄:Eu²⁺ in evacuated quartz ampoules via the vertical Bridgman technique. The optimal Eu²⁺ concentration was 4% for KBa₂I₅ and 7% for K₂BaI₄. The X-ray excited emissions at 444 nm for KBa₂I₅:Eu 4% and 448 nm for K₂BaI₄:Eu 7% arise from the 5d-4f radiative transition in Eu²⁺. KBa₂I₅:Eu 4% has a light yield of 90,000 photons/MeV, with an energy resolution of 2.4% and K₂BaI₄:Eu 7% has a light yield of 63,000 ph/MeV, with an energy resolution of 2.9% at 662 keV. Both crystals have an excellent proportional response to a wide range of gamma-ray energies.

Original language	English
Pages (from-to)	301-307
Number of pages	7
Journal	Journal of Luminescence
Volume	169
DOIs	https://doi.org/10.1016/j.jlumin.2015.09.013
State	Published - Jan 1 2016

Funding

Research at Oak Ridge National Laboratory was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, US Department of Energy. This work was supported by the US Department of Homeland Security , Domestic Nuclear Detection Office , under grant # 2014-DN-077-ARI088-01 and grant # 2012-DN-077-ARI067-04 . This support does not constitute an express or implied endorsement on the part of the Government.

Funders	Funder number
Scientific User Facilities Division
U.S. Department of Energy
U.S. Department of Homeland Security
Basic Energy Sciences
Domestic Nuclear Detection Office	2012-DN-077-ARI067-04, 2014-DN-077-ARI088-01

Keywords

Gamma-ray detection
Metal halide
Scintillator

Access to Document

10.1016/j.jlumin.2015.09.013

Cite this

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title = "Scintillation properties of Eu2+-doped KBa2I5 and K2BaI4",

abstract = "We report two new ternary metal halide scintillators, KBa2I5 and K2BaI4, activated with divalent europium. Single crystal X-ray diffraction measurements confirmed that KBa2I5 has a monoclinic structure (P21/c) and that K2BaI4 has a rhombohedral structure (R3c). Differential scanning calorimetry showed singular melting and crystallization points, making these compounds viable candidates for melt growth. We grew 13 mm diameter single crystals of KBa2I5:Eu2+ and K2BaI4:Eu2+ in evacuated quartz ampoules via the vertical Bridgman technique. The optimal Eu2+ concentration was 4% for KBa2I5 and 7% for K2BaI4. The X-ray excited emissions at 444 nm for KBa2I5:Eu 4% and 448 nm for K2BaI4:Eu 7% arise from the 5d-4f radiative transition in Eu2+. KBa2I5:Eu 4% has a light yield of 90,000 photons/MeV, with an energy resolution of 2.4% and K2BaI4:Eu 7% has a light yield of 63,000 ph/MeV, with an energy resolution of 2.9% at 662 keV. Both crystals have an excellent proportional response to a wide range of gamma-ray energies.",

keywords = "Gamma-ray detection, Metal halide, Scintillator",

author = "L. Stand and M. Zhuravleva and B. Chakoumakos and J. Johnson and A. Lindsey and Cl Melcher",

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doi = "10.1016/j.jlumin.2015.09.013",

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T1 - Scintillation properties of Eu2+-doped KBa2I5 and K2BaI4

AU - Stand, L.

AU - Zhuravleva, M.

AU - Chakoumakos, B.

AU - Johnson, J.

AU - Lindsey, A.

AU - Melcher, Cl

PY - 2016/1/1

Y1 - 2016/1/1

N2 - We report two new ternary metal halide scintillators, KBa2I5 and K2BaI4, activated with divalent europium. Single crystal X-ray diffraction measurements confirmed that KBa2I5 has a monoclinic structure (P21/c) and that K2BaI4 has a rhombohedral structure (R3c). Differential scanning calorimetry showed singular melting and crystallization points, making these compounds viable candidates for melt growth. We grew 13 mm diameter single crystals of KBa2I5:Eu2+ and K2BaI4:Eu2+ in evacuated quartz ampoules via the vertical Bridgman technique. The optimal Eu2+ concentration was 4% for KBa2I5 and 7% for K2BaI4. The X-ray excited emissions at 444 nm for KBa2I5:Eu 4% and 448 nm for K2BaI4:Eu 7% arise from the 5d-4f radiative transition in Eu2+. KBa2I5:Eu 4% has a light yield of 90,000 photons/MeV, with an energy resolution of 2.4% and K2BaI4:Eu 7% has a light yield of 63,000 ph/MeV, with an energy resolution of 2.9% at 662 keV. Both crystals have an excellent proportional response to a wide range of gamma-ray energies.

AB - We report two new ternary metal halide scintillators, KBa2I5 and K2BaI4, activated with divalent europium. Single crystal X-ray diffraction measurements confirmed that KBa2I5 has a monoclinic structure (P21/c) and that K2BaI4 has a rhombohedral structure (R3c). Differential scanning calorimetry showed singular melting and crystallization points, making these compounds viable candidates for melt growth. We grew 13 mm diameter single crystals of KBa2I5:Eu2+ and K2BaI4:Eu2+ in evacuated quartz ampoules via the vertical Bridgman technique. The optimal Eu2+ concentration was 4% for KBa2I5 and 7% for K2BaI4. The X-ray excited emissions at 444 nm for KBa2I5:Eu 4% and 448 nm for K2BaI4:Eu 7% arise from the 5d-4f radiative transition in Eu2+. KBa2I5:Eu 4% has a light yield of 90,000 photons/MeV, with an energy resolution of 2.4% and K2BaI4:Eu 7% has a light yield of 63,000 ph/MeV, with an energy resolution of 2.9% at 662 keV. Both crystals have an excellent proportional response to a wide range of gamma-ray energies.

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