共查询到20条相似文献,搜索用时 0 毫秒
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Y. V. Zorenko 《Journal of Applied Spectroscopy》1998,65(2):218-223
The processes of crystallization by the method of liquid epitaxy are studied for the first time for single-crystal films of
CdWO4 doped with the mercurylike ions Bi3+ and Pb2+, which can be used as thin-film components of combined scintillators for monitoring α- and β-activities. It is shown that
in comparison with their solidcrystal analogs, the special features of these films consist in a longwave shift of the integral
luminescence spectrum that is caused by high concentrations of the radiating complexes (VCd-WO6) with hvmax=2.05–2.15 eV and the “distorted” complexes (WO6)* in them. It is found that in the case of luminescence of single-crystal films CdWO4:Pb, radiation of mercurylike centers (PbO6) prevails with hvmax=2.87 eV, while in luminescence of CdWO4, radiation of centers (BiO6) with hvmax=2.16 eV and of complexes (VCd-WO6).
Institute of Applied Physics, Iv. Franko Lvov State University, 49, General Chuprynka St., Lvov, 290044, Ukraine. Translated
from Zhurnal Prikladnoi Spektroskopii, Vol. 65, No. 2, pp. 211–215, March–April, 1998. 相似文献
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We report on the photoluminescence spectra of thin films of chain-like π-conjugated molecules on well-defined surfaces of wide gap inorganic materials. The aim is to study the energy transfer processes across the organic/substrate interface which limit the luminescence of molecules in close contact to substrate surfaces. We discuss quaterthiophene (4 T) adsorbed on the c(2×2)-ZnSe(0 0 1) surface and tetracene (Tc) on the surface of a thin epitaxial Al2O3 film on Ni3Al(1 1 1). For thin films vapor-deposited at low substrate temperatures, we observe no luminescence signal for both systems, which indicates the presence of fast luminescence quenching processes at the organic/inorganic interface. After annealing, luminescence spectra corresponding to those of the bulk crystals are obtained. This can be explained by the formation of 3D-crystallites, which effectively separate most molecules from the organic/inorganic interface. 相似文献
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V. V. Pologrudov 《Journal of Applied Spectroscopy》1995,62(3):582-584
Irkutsk State University, 20, Gagarin Av., Irkutsk, 664003, Russia. Translated from Zhurnal Prikladnoi Spektroskopii, Vol.
62, No. 3, pp. 215–217, May–June, 1995. 相似文献
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G. A. Denisenko V. A. Oleinikov G. E. Malashkevich A. P. Voitovich A. G. Bazylev B. V. Mchedlishvili V. Strenk 《Journal of Applied Spectroscopy》1995,62(6):1093-1096
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 62, No. 6, pp. 130–134, November–December, 1995. 相似文献
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V. V. Gruzinskii S. M. Kazakov M. N. Kaputerko I. I. Kulak V. A. Suchkov 《Journal of Applied Spectroscopy》1998,65(2):224-231
Information on paths in absorption and deactivation of energy gained by molecules in their excitation by electron impact to
low-lying singlet states has been obtained from an analysis of changes in the fluorescence spectra of these molecules. It
is shown that there is a significant difference in the formation of fluorescence spectra when free molecules are excited by
optical radiation and by electrons. It contrast to optical excitation, the interaction of an electron with a molecule is nonselective
in character. All electronic states have a chance to be excited, which results in ensembles of emitting molecules with a different
store of vibrational energy, and these ensembles each contribute to the fluorescence spectrum.
Deceased.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 65, No. 2, pp. 216–223, March–April, 1998. 相似文献
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 62, No. 6, pp. 135–139, November–December, 1995. 相似文献
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