Accession Number : AD0690116

Title :   APPLICATIONS OF THERMOLUMINESCENCE TO CHROMIUM-DOPED LITHIUM GERMANATE.

Descriptive Note : Physical sciences research papers no. 377,

Corporate Author : AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS

Personal Author(s) : Johnson,Albert D. ; Littler,James R.

Report Date : APR 1969

Pagination or Media Count : 31

Abstract : Several features of thermoluminescence from chromium-doped lithium germanate were explored. These included: thermoluminescence excitation and emission spectra, thermal activation energies, recombination kinetics, behavior of glow curves as a function of sample temperature-during-excitation, and thermal bleach after excitation. Strong thermoluminescence was obtained by exciting electrons to energies above the U- and Y-absorption bands, and very weak thermoluminescence by exciting to these bands. Thermoluminescence emission occurred in the same wavelength region as fluorescence. Activation energies ranged from 0.17 to 2.3 eV. Thermoluminescence was found to be a sensitive function of temperature-during-excitation; large increases in high-temperature peaks were accompanied by small decreases in low-temperature glow peaks. Thermal bleaching after excitation, however, left high temperature peaks unchanged, while low-temperature peaks were removed. (Author)

Descriptors :   (*GERMANIUM COMPOUNDS, *THERMOLUMINESCENCE), LITHIUM COMPOUNDS, BAND THEORY OF SOLIDS, ELECTRON TRANSITIONS, LASERS, OXIDES, EXCITATION, CHROMIUM, DOPING

Subject Categories : Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE