OLY(2,5-DIHEPTYL-1,4-PHENYLENE-ALT-2,5-THIENYLENE) - A NEW MATERIAL FOR BLUE-LIGHT-EMITTING DIODES

The electronic and chemical structures of a new polymer, ly(2,5-dihept yl-1,4-phenylene-alt-2,5-thienylene), have been studied experimentally by X-ray and ultraviolet photoelectron spectroscopies, and theoretica lly by quantum chemical calculations. Optical absorption and photolumi nescence spectra were also obtained. In addition, single-layer light-e mitting diodes, consisting of calcium electrodes deposited on polymer films which had been spin-coated on ITO glass, were fabricated in ultr a-high vacuum, and the electroluminescence spectra as well as current- voltage curves were studied. The polymer was found to be highly fluore scent, emitting light of light-blue/green color. The light emitted fro m the diodes was turquoise in color and clearly visible in daylight.