%0 Journal Article
%T Preparation of Organic Zn-Phthalocyanine-Based Semiconducting Materials and Their Optical and Electrochemical Characterization
%A Amira Hajri
%A Sarra Touaiti
%A Bassem Jamoussi
%J Advances in OptoElectronics
%D 2013
%I Hindawi Publishing Corporation
%R 10.1155/2013/321563
%X In order to increase the species of organic semiconductors, new Zn-phthalocyanines-based organic materials were synthesized and characterized. The new compounds have been characterized by 1H and 13C using NMR, FTIR, and UV-Vis. The absorption, fluorescence, and electrochemical properties were also studied. Green photoluminescence was observed in dilute solutions. In solid thin films, ¦Ð-¦Ð* interactions influenced the optical properties, and redshifted photoluminescence spectra were obtained; red emissions for ZnPAL (647£¿nm) and ZnPTr (655£¿nm) were found. By cyclic voltammetry, the electrochemical band gap was estimated to be 1.94 and 1.17£¿eV for ZnPAl and ZnPTr, respectively. Single-layer diode devices of an indium tin oxide/Zn-phthalocyanine/aluminum configuration were fabricated and showed relatively low turn-on voltages (3.3£¿V for ZnPAl and 3£¿V for ZnPTr). 1. Introduction Phthalocyanines and related macrocycles have drawn considerable attention as molecular materials that give rise to outstanding electronic and optical properties. These properties arise from their electronic delocalization and make these compounds applicable in different fields of materials science; they are particularly promising as building blocks in nanotechnology. Some of the potential uses for phthalocyanines include nonlinear optical materials [1], liquid crystals [2], Langmuir-Blodgett (LB) films [3], optical data storage (computer recordable DVDs) [4], as electrochromic substances [5], low dimensional metals [6], and gas sensors [7], as photosensitizers [8], in photoelectrochemical cells [9] and electrophotographic applications [10]. Substitution has a strong influence on the ¦Ð-electron conjugation of the macromolecule, since it makes salvation easier [11]. In recent years reports predict that a suitable functionalization of the M(Pc) molecules permits realizing more charge transfer processes decreasing [12], thus, the difference between HOMO and LUMO orbital (gap energy). We described herein, the synthesis and characterization of novel Zn(II) phthalocyanine derivatives which contain a 1,2,3 triazole unit on each benzo group, and tetra-substituted alkynyl phthalocyanine was synthesis for comparison purpose. ZnPcs structures were characterized by Fourier Transform Infrared Spectrophotometry (FTIR); we studied their electrochemical, optical (by UV-Vis absorption and photoluminescence spectroscopy), and electrical properties. 2. Experimental 2.1. Materials and Measurement N,N¡ä-dimethylformamide (DMF) were freshly used; alcohols and initiator products were purchased from Aldrich.
%U http://www.hindawi.com/journals/aoe/2013/321563/