Sm. Ramasamy et Rj. Hurtubise, ENERGY-GAP LAW AND ROOM-TEMPERATURE PHOSPHORESCENCE OF POLYCYCLIC AROMATIC-HYDROCARBONS ADSORBED ON CYCLODEXTRIN SODIUM-CHLORIDE SOLID MATRICES, Applied spectroscopy, 50(1), 1996, pp. 115-118
The energy-gap law was shown to be applicable to the room-temperature
solid-matrix phosphorescence of polycyclic aromatic compounds adsorbed
on cyclodextrin/salt matrices. No heavy atom was used to enhance the
phosphorescence signals. As the energy gap between the lowest excited
triplet state and ground state increased, the phosphorescence lifetime
of the phosphor increased. The changes in the phosphorescence lifetim
es were correlated with the magnitude of the nonradiative rate constan
ts which, in torn, were related to the energy gap between the excited
triplet state and ground state. With the correlations developed, it is
possible to predict which polycyclic aromatic hydrocarbons will give
strong solid-matrix phosphorescence.