Accession Number : AD0603615

Title :   RE-EXAMINATION OF THE LUMINESCENT PROPERTIES OF THE MIXED PHENYL- AND P-BIPHENYLYL SILANES.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Peterson,Edward A.

Report Date : MAY 1964

Pagination or Media Count : 208

Abstract : Some luminescent properties of the tetraaryl silane family composed of tetraphenyl silane, triphenyl-pbiphenylyl silane (Silane I), diphenyl-di-p-biphenylyl silane (Silane II), phenyl-tri-p-biphenylyl silane (Silane III), and tetra-p-biphenylyl silane (Silane IV) were re-examined to determine the effect of a p-quaterphenyl impurity on the luminescent properties previously reported. Molar extinction coefficient calculations indicate that the pbiphenylyl-substituted silanes absorb light in direct proportion to the number of p-biphenylyl molecules attached to the silicon atom. The absorption spectra are apparently not affected by the p-quaterphenyl impurity. The visible fluorescence previously reported for the p-biphenylyl silanes was found to be due to the p-quaterphenyl impurity. Pure silanes I, II, III, and IV have fluorescence emission in the 310-320 millimicron region. Phosphorescence in the region 425-500 millimicrons was observed for Silanes I, II, and III. Mean lifetimes of 2.5 seconds for Silane I, and 2.0 seconds for Silanes II and III were calculated. (Author)

Descriptors :   (*SILANES, FLUORESCENCE), (*FLUORESCENCE, SILANES), PHOSPHORESCENT MATERIALS, SILICONE PLASTICS, IMPURITIES, MOLECULAR STRUCTURE, ABSORPTION SPECTRA, SCINTILLATION COUNTERS

Distribution Statement : APPROVED FOR PUBLIC RELEASE