Improvement of γ-ray energy resolution of LaBr3:Ce3+ scintillation detectors by Sr2+ and Ca2+ co-doping

Alekhin, Mikhail S.; Haas, J.T.M. de; Khodyuk, I. V.; Krämer, Karl; Menge, P.; Ouspenski, V.; Dorenbos, P.

doi:10.1063/1.4803440

Cited by 132 publications

(64 citation statements)

References 17 publications

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“…Recently, LaBr 3 :5%Ce co-doped with Sr showed a record low energy resolution of 2% at 662 keV. 11 This improvement was ascribed to a more proportional response of LaBr 3 :5%Ce, Sr as compared to standard LaBr 3 :5% Ce. 11 Yang et al 12 also observed light yield, energy resolution, and proportionality improvements of Sr and Ba codoped LaBr 3 :5%Ce crystals.…”

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Improvement of LaBr3:5%Ce scintillation properties by Li+, Na+, Mg2+, Ca2+, Sr2+, and Ba2+ co-doping

Alekhin

Biner

Krämer

et al. 2013

Journal of Applied Physics

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This paper reports on the effects of Li þ , Na þ , Mg 2þ , Ca 2þ , Sr 2þ , and Ba 2þ co-doping on the scintillation properties of LaBr 3 :5%Ce 3þ . Pulse-height spectra of various gamma and X-ray sources with energies from 8 keV to 1.33 MeV were measured from which the values of light yield and energy resolution were derived. Sr 2þ and Ca 2þ co-doped crystals showed excellent energy resolution as compared to standard LaBr 3 :Ce. The proportionality of the scintillation response to gamma and X-rays of Ca 2þ , Sr 2þ , and Ba 2þ co-doped samples also considerably improves. The effects of the co-dopants on emission spectra, decay time, and temperature stability of the light yield were studied. Multiple thermoluminescence glow peaks, decrease of the light yield at temperatures below 295 K, and additional long scintillation decay components were observed and related to charge carrier traps appearing in LaBr 3 :Ce 3þ with Ca 2þ , Sr 2þ , and Ba 2þ co-doping.

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“…In Ref. 11, we showed that the electron response is remarkably more proportional in LaBr 3 :Ce,Sr as compared to standard LaBr 3 :Ce. This results in a much smaller contribution of R nPR and an improved energy resolution in LaBr 3 :Ce,Sr.…”

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confidence: 99%

Improvement of LaBr3:5%Ce scintillation properties by Li+, Na+, Mg2+, Ca2+, Sr2+, and Ba2+ co-doping

Alekhin

Biner

Krämer

et al. 2013

Journal of Applied Physics

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“…46,47 Incorporation of 100 ppm of Sr 2þ , a charged impurity with z ¼ 1, resulted in a large improvement of the photon-nPR that brings energy resolution of LaBr 3 to 2% at 662 keV which is almost at the theoretical limit shown in Fig. 2.…”

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confidence: 84%

Energy resolution and related charge carrier mobility in LaBr3:Ce scintillators

Khodyuk

Quarati

Alekhin

et al. 2013

Journal of Applied Physics

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The scintillation response of LaBr 3 :Ce scintillation crystals was studied as function of temperature and Ce concentration with synchrotron X-rays between 9 keV and 100 keV. The results were analyzed using the theory of carrier transport in wide band gap semiconductors to gain new insights into charge carrier generation, diffusion, and capture mechanisms. Their influence on the efficiency of energy transfer and conversion from X-ray or c-ray photon to optical photons and therefore on the energy resolution of lanthanum halide scintillators was studied. From this, we will propose that scattering of carriers by both the lattice phonons and by ionized impurities are key processes determining the temperature dependence of carrier mobility and ultimately the scintillation efficiency and energy resolution. When assuming about 100 ppm ionized impurity concentration in 0.2% Ce 3þ doped LaBr 3, mobilities are such that we can reproduce the observed temperature dependence of the energy resolution, and in particular, the minimum in resolution near room temperature is reproduced. V C 2013 AIP Publishing LLC. [http://dx

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“…9 Lately, codoping of scintillators has also proven to be a successful route to improved scintillation properties. [10][11][12][13][14] Unfortunately, the complex physics underlying the energy resolution of scintillators presently is still only understood at a qualitative level. Better fundamental, quantitative insight is needed, to enable targeted materials design for scintillators.…”

Section: Introductionmentioning

confidence: 99%

Excitons in scintillator materials: Optical properties and electron-energy loss spectra of NaI, LaBr₃, BaI₂, and SrI₂

Schleife

Zhang

et al. 2016

J. Mater. Res.

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Materials for scintillator radiation detectors need to fulfill a diverse set of requirements such as radiation hardness and highly specific response to incoming radiation, rendering them a target of current materials design efforts. Even though they are amenable to cutting-edge theoretical spectroscopy techniques, surprisingly many fundamental properties of scintillator materials are still unknown or not well explored. In this work, we use first-principles approaches to thoroughly study the optical properties of four scintillator materials: NaI, LaBr 3 , BaI 2 , and SrI 2 . By solving the Bethe-Salpeter equation for the optical polarization function we study the influence of excitonic effects on dielectric and electron-energy loss functions. This work sheds light into fundamental optical properties of these four scintillator materials and lays the ground-work for future work that is geared toward accurate modeling and computational materials design of advanced radiation detectors with unprecedented energy resolution.

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Improvement of γ-ray energy resolution of LaBr3:Ce3+ scintillation detectors by Sr2+ and Ca2+ co-doping

Cited by 132 publications

References 17 publications

Improvement of LaBr3:5%Ce scintillation properties by Li+, Na+, Mg2+, Ca2+, Sr2+, and Ba2+ co-doping

Improvement of LaBr3:5%Ce scintillation properties by Li+, Na+, Mg2+, Ca2+, Sr2+, and Ba2+ co-doping

Energy resolution and related charge carrier mobility in LaBr3:Ce scintillators

Excitons in scintillator materials: Optical properties and electron-energy loss spectra of NaI, LaBr₃, BaI₂, and SrI₂

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Improvement of γ-ray energy resolution of LaBr3:Ce3+ scintillation detectors by Sr2+ and Ca2+ co-doping

Cited by 132 publications

References 17 publications

Improvement of LaBr3:5%Ce scintillation properties by Li+, Na+, Mg2+, Ca2+, Sr2+, and Ba2+ co-doping

Improvement of LaBr3:5%Ce scintillation properties by Li+, Na+, Mg2+, Ca2+, Sr2+, and Ba2+ co-doping

Energy resolution and related charge carrier mobility in LaBr3:Ce scintillators

Excitons in scintillator materials: Optical properties and electron-energy loss spectra of NaI, LaBr3, BaI2, and SrI2

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Excitons in scintillator materials: Optical properties and electron-energy loss spectra of NaI, LaBr₃, BaI₂, and SrI₂