Results 251 to 260 of about 69,993 (291)
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Luminescence centers in SnO2 single crystals
Solid State Communications, 1978Abstract The luminescence spectrum observed in SnO 2 has been analyzed based on the vibroelectronic model. However, additional measurements of the photoconductivity and the spectral distribution of recombination probability cannot be explained by this model, which only takes into account strong phonon coupling.
M. De Murcia, M. Egee, J.P. Fillard
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Pr3+ Centers in YSZ single crystals
Journal of Alloys and Compounds, 2001Abstract The low-temperature optical-absorption and fluorescence spectra of Pr 3+ ions in yttria stabilized zirconia single crystals were extensively investigated. From total site selective spectroscopy and time resolved measurements, at least three different optical centers were identified and associated with Pr 3+ ions in two different ...
J.E Muñoz-Santiuste +2 more
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Europium emission centers in CsI:Eu crystal
Optical Materials, 2013Absorption, excitation and luminescence spectra of pure and Eu doped CsI crystals were studied depending on the activator content, excitation energy, heat treatment and X-ray irradiation. Several types of Eu2+ related centers were found. It is shown that complex centers are stable at room temperature but their structure and concentration changes at ...
Gektin, A. +4 more
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Color Centers in ZnS Single Crystals
The Journal of Chemical Physics, 1961Absorption bands induced in ZnS crystals by uv (0.366 μ) are described. The two main absorption bands peaked at or below 0.6 μ and at 1.2 μ. Two weaker bands at 0.8 and 1.35 appear as shoulders of the main bands. Thermal and optical bleaching properties are also described, and the results are shortly discussed in light of a formerly proposed model.
A. Halperin, R. Pinker
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Trapping centers in inse single crystals
Materials Chemistry and Physics, 1983Abstract A systematic investigation of centers acting in InSe single crystals has been carried out by means of the following electric and photoelectronic techniques: 1. a) Resistivity behaviour as a function of temperature, analyzed by the single donor-single acceptor model 2.
DI GIULIO, Massimo +4 more
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Color centers in lead molybdate crystals
Physics of the Solid State, 2003Color center formation in PbMoO4 crystals, originating from nonstoichiometric batch composition, BaO and Bi2O3 additions, high-temperature annealing of crystals, and UV illumination, is discussed. Additional optical absorption bands are identified. The photochromism of the crystals is shown to be due to charge exchange, Pb2+ + Mo6+ ⇄ Pb3+ + Mo5+, of ...
T. M. Bochkova +3 more
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Enrichment centers in sodium bromide crystals
Soviet Physics Journal, 1979The primary products of irradiation of alkali halide crystals are anion and cation Frenkel pairs [1–4]. Interaction of these products among themselves and with structural defects existing before irradiation leads to the appearance of various structural defects, the majority of which are optically active.
Yu. M. Annenkov +2 more
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Vacancy Aggregate Centers in Ionic Crystals
1976The purpose of this chapter is to review briefly the optical properties of vacancy aggregate centers and how these are related to the electronic structure of the defects. While the F center is still the best studied and understood defect, considerable progress has been made through the years in understanding the more complex centers.
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Colour centers in synthetic fluorite crystals
Physica, 1958Synopsis A study of the coloration of fluorite crystals after irradiation and additive coloration has been made. Bleaching experiments and lattice parameter measurement lead us to probable models for the α and β centers. The β center should be a normal F-center, the α center an F-center coupled to an interstitial fluorine ion.
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