Synthesis and Identification of a Hyperbranched Polymer of Tris(8-hydroxyquinoline) Aluminum Linked with Ethylene Glycol
In this paper the authors discribed the convergent synthesis of a novel hyperbranched polymer, tris(8-hydroxyquinoline) aluminum (Alq3) linked with ethylene glycol, and the indentification of the polymer by UV/vis spectra, photoluminescence spctra(PL),1H NMR spectra, element analysis (EA), differential scanning calorimetry (DSC), gel permeation chromatography (GPC), thermal gravimetric analysis (TGA), Cyclic voltammetry (CV), etc.. By introducing Alq3 into the hyperbranched polymer, which was connected with alkoxy chain, the electron injection and transport properties were improved. The maximum absorption peak of the polymer is 58nm blue-shifted, but the emission peak of the polymer is 32nm red-shifted to Alq3 in chloroform soltion. The optical energy band-gap estimated from the absorption edges is 2.845eV. These optical characters of it indicated that the operation, connecting Alq3 with ethylene glycol, could increase the energy band-gap but make the photos easier to transfer between the HOMO and LUMO energy levels.
Wei Pan and Jianghong Gong
B. Song et al., "Synthesis and Identification of a Hyperbranched Polymer of Tris(8-hydroxyquinoline) Aluminum Linked with Ethylene Glycol ", Advanced Materials Research, Vols. 105-106, pp. 305-309, 2010