ELECTROOPTICAL PROPERTIES OF THIN-FILM ORGANIC SEMICONDUCTOR

It is observed that the type of electroluminescent cell structure we have chosen for the present study, behaves as a single injecting system and the voltage dependence. of electroluminescent (EL) cell brightness is determined by enhanced hole injection from the anode barrier. It is also observed that the transit and the interaction of exciton with the traps, or carriers, or surface states play significant roles, so far as the frequency dependence of EL brightness is concerned. The frequency dependence of EL brightness exhibit a maxima and EL emission get extinct at high frequency. It has been found that the EL spectra of pure and doped crystals appear to resemble with the spectra in thinfilm form.