Synthesis and determination of the electron affinity, ionization potential and energy of band prohibited of electroluminescent polymers / Síntese e determinação da afinidade eletrônica, potencial de ionização e energia de banda proibida de polímeros eletroluminescentes

AUTOR(ES)

Mauricio Foschini

DATA DE PUBLICAÇÃO

2004

RESUMO

In this work we describe the electrochemical and optical aspects of a series of electrochemically synthesized blue-electroluminescent conjugated polymers. The materials employed here comprised poly(p-phenylene) (PPP), poly(pyrro1e) (PPI), poly(3-methylthiophene) (P3MET), poly(p-pheny1ene-pyrrole) (CPPI) copolymer and poly(p-phenylene3methyIthiophene) (CP3MET) copolymer. The films were electrochemically synthesized and deposited onto indium-tin-oxide covered glass (ITO) electrodes. The latter was carried out using either cyclic voltammetry (VC) or cronoamperometry (CR) in a acetonitrile nonaqueous medium containing tetrabutilammonium perclorate and different concentration of the respective monomers. As a further film quality control, the synthesis was carried out within a glove box containing a CaCI2 salt, which acted as drying agent. The latter procedure allowed us to correlate the amount of moisture present within the glove box with the electrochemical properties of the films. The ionization potential (PI) and the electronic affinity (AE) were calculated using the oxidation and reduction on-set potentials of the films (Eoxde Ered). The electronic gap (EgapE)d the optical gap energies were calculated using electrochemical and UV-VIS. spectroscopy respectively.

ASSUNTO(S)

afinidade eletrônica energia de banda proibida ionization poly(3-methylthiophene) poly(p-phenylene) copolimerization polímeros eletroluminescentes electroluminescent polymers polypyrrole eletroafinidade energia de gap polipirrol eletrosíntese energy of band prohibited copolimerização poli(p-fenileno) potential eectron affinity electrosynthesis potencial de ionização energy gap poli(3-meteliofeno)

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