A polymer formed from optionally substituted first repeat units of formula (I) wherein Ar is selected from (a) aromatic hydrocarbon substituted with at least one electron withdrawing group or electron withdrawing heteroaryl. The polymers have application in electroluminescent devices.

 
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> Light-emitting device, condensed polycyclic compound used therein and method for producing same

> Tandem OLED having an organic intermediate connector
~ 00501