標題: Design, synthesis, photophysical, and electrochemical properties of DCM-based conjugated polymers for light-emitting devices
作者: Vanjinathan, Mahalingam
Lin, Hong-Cheu
Nasar, A. Sultan
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: A2+B3 approach;conjugated polymers;charge transfer;cyclic voltammetry;electroluminescence;hyperbranched polymers;Knoevenagel reaction;photophysical property;PLEDs
公開日期: 15-九月-2012
摘要: A series of conjugated hyperbranched polymers, hyperbranched copolymers, and linear polymers containing 2-pyran-4-ylidenemalononitrile (acceptor) and triphenylamine/fluorene (donor) units were synthesized and characterized by FTIR, 1H NMR, thermogravimetric analyses, differential scanning calorimetry, gel permeation chromatography, UVvisible, photoluminescence, and cyclic voltammetry measurements. All the polymers show red-light emission in the range of 566656 nm both in solution and in solid state. The quantum efficiency of the polymers was in the range of 5682%. Among the six polymers synthesized, only polymers containing fluorene units show Tg and polymers based on triphenylamine not exhibit Tg. The band gap of these polymers were found to be reasonably low; hyperbranched copolymer containing fluorene unit shows lowest band gap of 2.18 eV due to the stabilization of LUMO energy level by the electron withdrawing ?CN groups. The thermal and solubility behavior of the polymers were found to be good. All the EL spectra of the devices (indium-tin oxide/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)/polymer/2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline/tris(8-hydroxyquinoline)aluminum)/LiF/Al) show red-light emission, and the device fabricated with P3 and P4 shows maximum luminance and luminous efficiency of 4104 cd m-2 and 0.55 cd angstrom-1 and 3696 cd m-2 and 0.47 cd angstrom-1, respectively, indicates that they had the best carrier balance. (c) 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012
URI: http://dx.doi.org/10.1002/pola.26169
http://hdl.handle.net/11536/150475
ISSN: 0887-624X
DOI: 10.1002/pola.26169
期刊: JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
Volume: 50
起始頁: 3806
結束頁: 3818
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