NDLI: Spectral characteristics of europium-doped lead iodide

Content Provider	Springer Nature Link
Author	vosad, I. S. vosad, S. S.
Copyright Year	2013
Abstract	Optical absorption and x-ray luminescence spectra and thermally stimulated luminescence curves of a PbI$_{2}$:EuCl$_{3}$ crystal grown by the Stockbarger method were investigated in the temperature range 85–295 K. It was presumed based on results of EPR spectral studies that the europium ions in this material existed in the divalent state and replaced matrix cations. An intense broad non-elementary band at 780 nm in addition to a weak band with a maximum in the range 512–520 nm were observed in the PbI$_{2}$:Eu$^{2+}$ x-ray luminescence spectrum at 85 K. The intensity of the long-wavelength emission increased slightly upon increasing the crystal temperature from 85 to 130 K and was quenched in several stages upon increasing the temperature further to 220 K. The maximum shifted to 740 nm. It was proposed based on an analysis of the obtained data and results of a study of the luminescence properties of PbI$_{2}$ and PbI$_{2}$:Mn$^{2+}$ crystals that the non-elementary emission band of the PbI$_{2}$:Eu$^{2+}$ crystal at 780 nm could be represented as a superposition of three individual Gaussian bands with maxima near 715, 740, and 800 nm that were due to centers characteristic of the matrix and additional centers that were formed by Eu ions through association with intrinsic and dopant oxygen-containing defects, respectively. Doping PbI$_{2}$ with Eu$^{2+}$ ions did not affect the spectrum of matrix trapping levels. The nature of emission and trapping centers and luminescence excitation mechanisms of PbI$_{2}$:Eu$^{2+}$ were discussed.
Starting Page	191
Ending Page	196
Page Count	6
File Format	PDF
ISSN	00219037
Journal	Journal of Applied Spectroscopy
Volume Number	80
Issue Number	2
e-ISSN	15738647
Language	English
Publisher	Springer US
Publisher Date	2013-05-28
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	PbI$_{2}$:Eu$^{2+}$ crystal luminescence recombination processes emission center trapping center Atomic/Molecular Structure and Spectra Analytical Chemistry
Content Type	Text
Resource Type	Article
Subject	Spectroscopy Condensed Matter Physics

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