The nature of emitting states in electroluminescence of polymeric films doped with anthracene and anthracene-based supramolecules

Electroluminescent studies of anthracene (A) dispersed in a polycarbonate (PC) matrix show a long-wavelength emission band in addition to the broad band underlain by excimer states. Through studies of absorption,photolu- minescence and electroluminescence of PC dispersions of A-based supramolecules we demonstrate that this band results from so-called ‘‘electromer’’ (EL) states constituting charge pair states with the inter-ion separation ranged between 0.7 and 2.4 nm,and formed from electron–hole pairs with more distant charges. Holes and electrons can be either injected from electrodes of the electroluminescent cells or produced by dissociation of optically excited states