We report here the synthesis and luminescent properties of a new, solution-processable conjugated polymer (PPE2). The absorption, PL and EL spectra have been investigated. The results indicate that the hexyl unit interrupts the conjugation and thereby effects the energy band gap of the corresponding PPE1. Effective interruption of π conjugation of PPE1 at the hexyl unit linkage was further confirmed by spectroscopic comparison with the model compound. X-ray diffraction measurements on both pristine and annealed sample show that the polymer does not exit long-rang order and crystallinity. Electroluminescence (EL) in the green region of the spectrum with a maximum at 520 nm was observed from the polymer film sandwiched between indium-tin-oxide and Al electrodes.

Key words: ELECTROLUMINESCENCE, CHARACTERISTICS OF LUMINESCENCE, X-RAY DIFFRACTION ANALYSIS