Abstract: A novel electroluminescence polymer offers stable EL characteristics: it forms little aggregates and is less susceptible to morphological changes during and after film formation. The EL polymer comprises a binaphthyl derivative structural unit represented by the following formula (1a) and an aryl structural unit represented by the following formula (1b): wherein Ar is an aryl structural unit that can form an electroluminescent ?-conjugated polymer; R1, R2, R3, and R4 are each independently a different functional group; the double bonds of the binaphthyl structural unit indicated by dashed lines and solid lines are each an unsaturated double bond or a saturated single bond; m and p are each independently an integer of 0 to 2; n and o are each independently an integer of 0 to 8; x is the molar fraction of the binaphthyl derivative structural units; and y is the molar fraction of the aryl structural units.

Abstract: An electroluminescent polymer which has repeating units represented by formula (1) is obtained by polymerizing a bisfluorenylsilane compound which has specified substituent groups. In spite of the fact that this electroluminescent polymer is a ?-? conjugated type fluorene polymer, the deterioration in the color purity of EL caused by excimer formation is suppressed, so that the color purity of blue emitted light in particular is extremely high. This electroluminescent polymer is extremely useful as a light-emitting material in organic electroluminescent elements.