New benzo[b]furans as electroluminescent materials for emitting blue light

structure: see text] New functionalized mono- and bis-benzob]furan derivatives were synthesized and developed as blue-light emitting materials. They possessed a CN, CHO, CH=CHPh, CH=CPh(2), or CH=CHCOOH group at the C4-position. Two benzob]furan nuclei in bis-benzob]furan derivatives were connected by a divinylbenzene bridge. With good volatility and thermal stability, bis-benzob]furan 7a was fabricated as a device. It emitted blue light with brightness 53430 cd/m(2) (at 15.5 V) and high maximum external quantum efficiency 3.75% (at 11 V).