Accession Number : AD0775425

Title :   Energy Transfer between Inorganic Ions in Glasses.

Descriptive Note : Final technical rept. 15 Nov 72-14 Nov 73,

Corporate Author : HEBREW UNIV JERUSALEM (ISRAEL) DEPT OF INORGANIC AND ANALYTICAL CHEMISTRY

Personal Author(s) : Reisfeld,Renata

Report Date : NOV 1973

Pagination or Media Count : 38

Abstract : Inorganic glasses doped by rare earth (Gd(3+),Eu(3+),Sm(3+),Tb(3+),Tm(3+),Er(3+) and lead ions were prepared. Intensity parameters and probabilities of radiative electronic transitions were calculated from the experimentally obtained fluorescence and adsorption spectra. Nonradiative transition probabilities between various electronic levels were obtained from the quantum yields of the fluorescence and fluorescence life-times. A connection was found between the phonon energies of the glasses and the luminescence quantum yields of rare earth ions incorporated in these glasses. The amount of covalency between a given glass and a heavy metal ion was obtained from a study of optical characteristics of divalent lead in various glasses. A connection has been found between the nephelauxetic effect and electronegativity of the glasses. The probability of energy transfer between gadolinium and samarium was measured in borate glasses and the mechanism of transfer suggested. (Modified author abstract)

Descriptors :   *Rare earth elements, *Glass, *Lead(Metal), Electron transitions, Doping, Ions, Energy transfer, Absorption spectra, Emission spectra, Fluorescence, Phonons, Chemical bonds, Optical properties, Spectrum analysis, Atomic energy levels, Israel

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE