Phosphorescence line narrowing of coronene and phenanthrene adsorbed on cellulose substrates
Phosphorescence line narrowing (PLN) of phenanthrene and coronene adsorbed on cellulose (filter paper) substrates was observed for the first time. The 457.9- and 514.5-nm lines of an argon ion laser were used to directly excite into the T1 ← S0 transitions of the molecules. The transition probability was enhanced by the external heavy-atom effect of thallium acetate impregnated on the filter paper substrate. Measurements were conducted from 4 to 300 K to investigate the effects of temperature on the phosphorescence bandwidths and to provide qualitative information on the extent of electron-phonon coupling of the guest-host systems. The phosphorescence quantum yield was not found to be significantly temperature dependent. © 1985 American Chemical Society.
