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The preparation and characterization of high‐performance and thermally stable electroluminescent poly( p ‐phenylene‐vinylene‐ b ‐oligoethylene oxide)
Author(s) -
Zhu Lu,
Tang Xiaozheng
Publication year - 2007
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.25803
Subject(s) - electroluminescence , materials science , thermal stability , copolymer , phenylene , ethylene oxide , polymer chemistry , thin film , polymer , oxide , fourier transform infrared spectroscopy , chemical engineering , thermal decomposition , luminescence , layer (electronics) , nanotechnology , optoelectronics , composite material , organic chemistry , chemistry , engineering , metallurgy
Abstract Two luminescent block copolymers (PPVPEO 200 and PPVPEO 600 ), composed of poly( p ‐phenylene‐vinylene) (PPV) segments with three phenylene vinylene units and poly(ethylene oxide) (PEO) segments with molecular weight of 200 and 600, respectively, have been successfully synthesized. The structures of the copolymers were verified using FTIR, 1 H‐NMR, and elemental analysis. Single‐layer polymer light‐emitting electrochemical cells (LEC) devices fabricated on the bases of thin films of PPVPEO 600 and on the bases of thin films of blends of PPVPEO 200 with additional PEO both demonstrated good electroluminescent (EL) performance with the onset voltage of 2.6 V and EL efficiency of 0.64 cd/A and 0.68 cd/A at 3.2 V, respectively. Thermal analysis shows that the decomposition temperature of PPVPEO 600 is about 305°C, which is higher than that of PPVPEO 200 and PEO. AFM studies of PPVPEO 600 thin films exhibits that the block copolymer self‐assembles to form nanoscale network structures with pseudo‐ cross ‐linking points, thus accounting for its high thermal stability and good EL performance. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 1118–1125, 2007