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ABSTRACT:A new copolymer with short alternating conjugated and nonconjugated blocks, derived from bisphenol A (BPAEt 2 -PPV) containing separated phenylenevinylene (PV) units has been synthesized by Wittig condensation. The copolymer is fully soluble in common organic solvents and has a number-average molecular weight of 3200 with a polydispersity index of 1.53. The structure of the polymer was confirmed by 1 H NMR, 13 C NMR, FTIR and Raman spectroscopic analysis. Thermogravimetric analysis and differential scanning calorimetry indicate that BPAEt 2 -PPV is stable up to 400°C in air and displays a glass transition temperature of 107°C. The fluorescence spectrum of the polymer film shows an emission in the blue region (428, 456, and 488 nm). The band-gap energy, estimated from the edge absorption of the film, is about 2.9 eV. A single-layer diode device of the configuration ITO/BPAEt 2 -PPV/Al has been fabricated and has a relatively low turn-on voltage of 3.7 V.

International audienceA new luminescent copolymer (BPAEt(2)-BP; Scheme 1), with short alternating divinylbiphenyl units and O-diethylated bisphenol A (BPAEt(2)), was synthesized via the Wittig reaction. The polymer is fully soluble in common organic solvents and has a number-average molecular weight of 4600 g mol(-2) with a polydispersity index of 1.79. The structure of the polymer was confirmed by H-1 NMR, C-13 NMR, FTIR and Raman analysis. Thermal analysis of the polymer showed good stability up to 280 degrees C. Furthermore, polymer film absorbs at 360 nm and emits in the blue at 426 and 451 mn. The band-gap calculated from the UV-vis spectrum was about 2.80 eV. A single-layer device of the configuration indium tin oxide (ITO)/BPAEt(2)-BP/Al has a relatively low turn-on voltage of 3V. (c) 2005 Society of Chemical Industry