Photoluminescence of Pb2+-doped SrHfO3

Jarý, V.; Nikl, M.; Mihóková, E.; Boháček, P.; Trunda, Bohumil; Polák, K.; Studnička, V.; Múčka, V.

doi:10.1016/j.radmeas.2010.01.013

Cited by 18 publications

(6 citation statements)

References 10 publications

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“…The origin of the 335 nm band is in question as it has not been observed in the stoichiometric undoped SHO [12]. Its spectral position is very close to that of Pb 2+ center [10,11], but contamination by Pb ions is practically excluded in these samples (checked by ICP analysis). It is most probably related to the Sr-deficient SHO phase which is also supported by the residual content of HfO 2 compound in both the Ce-doped and Sr-deficient samples, see further in Section 3.2.…”

Section: Heavily Ce-doped Srhfomentioning

confidence: 92%

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SrHfO3-based phosphors and scintillators

et al. 2011

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a b s t r a c tThe heavily Ce-doped SrHfO 3 (SHO) and the undoped non-stoichiometric SHO sample sets were prepared by solid state reaction in powder form and their luminescence spectra and decay kinetics were measured. Concentration quenching effects and thermally induced ionization of the Ce 3+ excited states were followed and discussed in the former sample set. In the latter one new emission band at about 334 nm was found in Sr-deficient samples and temperature dependences of its emission intensity and decay times were studied in the detail. Room temperature decay time of about 180 ns and efficient and fast energy transfer from the host to the center of the 334 nm emission make this material promising candidate for X-ray phosphors.

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Section: Heavily Ce-doped Srhfomentioning

confidence: 92%

“…The onset of this process shifts with increasing Ce concentration to higher temperatures when the 0.1% and 5%Ce samples were compared. Recently, the Pb 2+ dopant has been proposed for SHO host [10,11]:…”

Section: Introductionmentioning

confidence: 99%

SrHfO3-based phosphors and scintillators

et al. 2011

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“…SrHfO 3 :Pb 2+ with an intermediate concentration of 0.3 mol % was also prepared by solid-state reaction in the Institute of Physics, ASCR, Prague ͑Czech Republic͒. 12 In this case the final sintering temperature was 1200°C.…”

Section: A Samples and Experimental Techniquesmentioning

confidence: 99%

“…Recently we reported optical and structural characteristics of SrHfO 3 powder samples prepared by acetate and citrate combustion 11 and solid-state reaction. 12 In addition to Cedoped SrHfO 3 we also introduced a different potentially interesting scintillator, Pb-doped SrHfO 3 . The radioluminescence ͑RL͒ at room temperature ͑RT͒ strongly depended on the final sintering temperature.…”

Section: Introductionmentioning

confidence: 99%

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Intrinsic and impurity-induced emission bands inSrHfO3

et al. 2010

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To better understand the scintillation mechanism in SrHfO 3-based scintillators we investigate in detail their x-ray excited radioluminescence ͑RL͒ emissions. The Gaussian decomposition of the undoped SrHfO 3 RL spectra manifests the presence of four emission bands peaking at 3.0, 4.0, 4.6, and 5.1 eV. Based on corresponding photoluminescence emission and excitation spectra we tentatively associate the observed bands with excitonic or defect-related emissions. When doped by Ce 3+ or Pb 2+ luminescent activators, the RL spectra feature two or three new bands, respectively. The temperature dependence of all RL spectra demonstrates a competition between activators and intrinsic or defect centers in carrier capture. Around room temperature the emission process is completely dominated by recombination at activator centers. In the case of Pb 2+ activator we also study in detail the concentration dependence of the RL spectra below room temperature exhibiting an optimal value around 0.3 mol %.

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