Abstract
We report investigations of photoluminescence (PL) and electroluminescence (EL) in several derivatives of polyether–polyphenylenevinylene copolymer (PEPPV). PL spectra depend on the conjugated block lengths on the end group, chlorine or bromine. Electroluminescent diodes were built in the classical sandwich structure, by evaporating PEPPV and aluminium layer under vacuum on an indium–tin oxide-covered glass slide. EL is obtained at a low voltage (less than 4 V) and the diode quantum efficiency depends strongly on the applied voltage. Transient behaviour of PEPPV thin films devices was also investigated. Between the application of a short rectangular voltage pulse and the onset of EL, a time lag exists that is attributed to the mobility of the charge carriers.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
