Dramatic photoluminescence quenching of phenylene vinylene oligomer thin films upon submonolayer Ca deposition

摘要

We report that Ca atoms severely quench the photoluminescence (PL) of an organic thin film 1,4hyphen;bislsqb;4hyphen;(3,5hyphen;dihyphen;terthyphen;butylstyryl)stryylrsqb;benzene (4PV). A submonolayer coverage (0.035 monolayer or 0.1 Aring;) of Ca on the 4PV surface reduced the PL of a 300 Aring; layer of 4PV by as much as 50percnt;. Three distinct quenching rates were observed throughout the 200 Aring; Ca deposition. An exciton diffusion length of 200 Aring; in 4PV is estimated assuming that the PL quenching is diffusion controlled. copy;1996 American Institute of Physics.