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Recombination processes in europium-doped cadmium iodide crystals

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Journal of Applied Spectroscopy Aims and scope

Results of comprehensive research into optical and luminescent-kinetic characteristics of europium-doped cadmium iodide crystals excited by nitrogen laser radiation, α-particles, and x-rays are presented. Crystals under study have been grown by the Bridgman–Stockbarger method. The doping EuCl3 admixture was introduced into the charge in quantities of about 0.05 and 1.0 mol%. Impurity absorption detected in the near-edge region of the crystals is interpreted as part of the Eu2+ ion long-wavelength band associated with f–d-transitions. The cation impurity and matrix defects in CdI2:Eu2+ crystals create complex centers responsible for emission with a maximum in the 580–600-nm region. The short component in the luminescence decay kinetics of weakly-doped crystal excited by α-particles and x-ray photons is due to the exciton emission characteristic of CdI2. The slow component in the scintillation pulse results from recombination of charge carriers followed by creation of exciton-like states on the defect-impurity centers. Laser or x-ray excitation induces light-sum accumulation on the trapping levels at a depth of 0.2–0.6 eV that is mainly related to matrix microdefects. Trapping centers associated with the chlorine impurity are observed in the heavily-doped crystal. Photostimulated luminescence at 85 K arising at the electron stage of the recombination process is caused by recombination of electrons released from F-type centers with holes localized near the activator.

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Authors and Affiliations

  1. Ivan Franko Lvov National University, 1 Universitetskaya St., Lvov, 79000, Ukraine

    S. S. Novosad & I. S. Novosad

  2. National University Lvivska Politekhnika, Lviv, Ukraine

    V. E. Goncharuk

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  1. S. S. Novosad
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  2. I. S. Novosad
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  3. V. E. Goncharuk
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Correspondence to S. S. Novosad.

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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 76, No. 3, pp. 358–364, May–June, 2009.

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Novosad, S.S., Novosad, I.S. & Goncharuk, V.E. Recombination processes in europium-doped cadmium iodide crystals. J Appl Spectrosc 76, 334–340 (2009). https://doi.org/10.1007/s10812-009-9188-9

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