TY - JOUR
T1 - Room temperature phosphorescence and delayed fluorescence of organic molecules trapped in silica sol-gel glasses
AU - Levy, David
AU - Avnir, David
PY - 1991/4/10
Y1 - 1991/4/10
N2 - Room temperature phosphorescence (RTP) is obtained from a wide variety of organic molecules when trapped in silica matrices prepared by the "sol-gel" polymerization process of tetramethoxysilane. Examples include polycyclic hydrocarbons, aromatic acids, an aromatic base (quinine) and an organic dye (eosin-y). Lifetimes of up to several seconds are observed. Conditions for observing RTP vary. In some cases co-trapping of a heavy atom is needed, whereas in others RTP is observed even in wet gels without a heavy atom. A detailed study of the phenomenon was performed with 4-biphenylcarboxylic acid. It RTP and delayed fluorescence properties were studied as a function of base concentration, reaction time and temperature (Arrhenius analysis), revealing a multitude of emitting species (the acid and its anion, either adsorbed on the silica cage surface or "dissolved" in solvent-rich cages).
AB - Room temperature phosphorescence (RTP) is obtained from a wide variety of organic molecules when trapped in silica matrices prepared by the "sol-gel" polymerization process of tetramethoxysilane. Examples include polycyclic hydrocarbons, aromatic acids, an aromatic base (quinine) and an organic dye (eosin-y). Lifetimes of up to several seconds are observed. Conditions for observing RTP vary. In some cases co-trapping of a heavy atom is needed, whereas in others RTP is observed even in wet gels without a heavy atom. A detailed study of the phenomenon was performed with 4-biphenylcarboxylic acid. It RTP and delayed fluorescence properties were studied as a function of base concentration, reaction time and temperature (Arrhenius analysis), revealing a multitude of emitting species (the acid and its anion, either adsorbed on the silica cage surface or "dissolved" in solvent-rich cages).
UR - http://www.scopus.com/inward/record.url?scp=0001856018&partnerID=8YFLogxK
U2 - 10.1016/1010-6030(91)85006-3
DO - 10.1016/1010-6030(91)85006-3
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AN - SCOPUS:0001856018
SN - 1010-6030
VL - 57
SP - 41
EP - 63
JO - Journal of Photochemistry and Photobiology A: Chemistry
JF - Journal of Photochemistry and Photobiology A: Chemistry
IS - 1-3
ER -