Results 251 to 260 of about 17,007 (304)
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Luminescence centers in CaS:Er3+
Inorganic Materials, 2006The diffuse reflectance, photoexcitation, and luminescence spectra and luminescence decay time of CaS:Er3+ have been measured at 77 and 300 K and different activator contents. The absorption and luminescence bands due to Er3+ centers and native defects have been revealed, and the radiative electronic transitions between excited and ground Er3+ states ...
A. N. Georgobiani +2 more
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Journal of Luminescence, 1979
Abstract Luminescence and TSL induced at 80 K by vuv and X-irradiation in pure and rare-earth doped synthetic sapphire were studied. TSL excitation maxima appeared at 134, 138 and 145 nm. Emission spectra showed, in addition to the impurity bands, for all samples a broad band at about 310 nm, which is ascribed to an excitonic process.
N. Kristianpoller, A. Rehavy
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Abstract Luminescence and TSL induced at 80 K by vuv and X-irradiation in pure and rare-earth doped synthetic sapphire were studied. TSL excitation maxima appeared at 134, 138 and 145 nm. Emission spectra showed, in addition to the impurity bands, for all samples a broad band at about 310 nm, which is ascribed to an excitonic process.
N. Kristianpoller, A. Rehavy
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Journal of Luminescence, 1988
Abstract New infrared excitation and absorption bands were found in alkali halides containing a Z 4 center. IR absorption bands exhibit a zero-phonon line with resolves phonon sideband at 4.2 K. It is concluded that the Z 4 center is an analogue of the F 3 center in undoped crystals.
Leonid Sobolev +2 more
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Abstract New infrared excitation and absorption bands were found in alkali halides containing a Z 4 center. IR absorption bands exhibit a zero-phonon line with resolves phonon sideband at 4.2 K. It is concluded that the Z 4 center is an analogue of the F 3 center in undoped crystals.
Leonid Sobolev +2 more
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Representative Luminescence Centers
1991As one searches for the most perceptive fit of these model functions to all experimental data, one often wishes to describe the same absorption and emission spectra both with equal and with unequal force constants. Such descriptions might keep the sum of the first moments and the product of the second moments constant, i.e., using the first two of Eqs.
Charles W. Struck, William H. Fonger
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Luminescence centers in quartz
Journal of Luminescence, 1984The photoluminescence (PL), radioluminescence (RL) and thermoluminescence (TL), excited in natural Norwegian quartz crystals by monochromatic uv light, beta and X-rays, were studied. Excitation and emission spectra were measured and the dependence of the intensities and the spectral composition of the emission on irradiation temperature as well as on ...
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Mercury-related luminescent center in silicon
Physical Review B, 1993We report a photoluminescence (PL) study of silicon subject to mercury-ion implantation and subsequent annealing A luminescence center is observed with a characteristic bound-exciton (BE) spectrum consisting of a narrow no-phonon line at 1067.9 meV and a series of equidistant phonon replicas with a phonon energy of about 8 meV.
, Henry +6 more
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Formation of luminescent centers in CeO2 nanocrystals
Journal of Luminescence, 2014Abstract The nature of luminescence centers in CeO2 nanocrystals with varied oxygen stoichiometry has been investigated. It was shown that the luminescence of CeO2 is caused by the radiative relaxation in two different optical centers: the first one is Ce4+–O2− charge transfer state and the second one is Ce3+ ions.
Masalov, A. +7 more
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Physics Letters, 1966
Abstract The 530 nm luminescence band and the luminescence zero phonon line at 487.5 nm in subtractively colored LiF are ascribed to an R center transition. The transition takes place between an energy level lower than the R2 level and the ground state.
G. Baumann +2 more
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Abstract The 530 nm luminescence band and the luminescence zero phonon line at 487.5 nm in subtractively colored LiF are ascribed to an R center transition. The transition takes place between an energy level lower than the R2 level and the ground state.
G. Baumann +2 more
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Luminescence of color centers in KI:Li+
Solid State Communications, 1982Abstract New luminescence bands have been observed in KI:Li + excited in the F band region. As suggested by the dependence of the bands upon the Lithium content of the samples, these bands are due to perturbed F and M centers (F A , F B and M A centers). The excitation spectrum, the wavelength and the polarization of the emission indicate that the
G. Baldacchini +4 more
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Luminescence of Cu+ centers in SrCl2
Journal of Luminescence, 1986Abstract Absorption, excitation and emission spectra have been obtained for Cu+-doped single crystals of SrCl2, and the emission lifetimes have been determined for this system. It was found that, in this host lattice, microcrystals of CuCl from whose spectroscopic properties (including excitonic absorption and emission) are similar to those of bulk ...
Stephen A. Payne +2 more
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