Two pyrene-functionalized oligofluorenes (TPA-PyF3 and CBP-PyF3) are prepared using the condensation reaction by the Friedel-Crafts procedure. In the produced oligomers, the triphenylamine or N,N-dicarbazolyl-4,4-biphenyl core serves as a spacer bearing spiro-linked fluorene moieties to form a multi-H shaped structure. This specific structure efficiently retards the crystallization tendency of the pyrene groups, and gives the materials completely amorphous morphological structure and film forming ability. Solution-processed OLEDs with the structure of ITO/PEDOT:PSS (25 nm)/TPA-PyF3 or CBP-PyF3 (40 nm)/TPBI (35 nm)/Ca (10 nm)/Ag (100 nm) show low turn-on voltages of 3.6 V, and the maximum external quantum efficiencies reach 1.78% and 2.07% for TPA-PyF3 and CBP-PyF3, respectively. Moreover, both devices exhibit stable deep-blue light emission with Commission International de I'Eclairage (CIE) coordinates of around (0.16, 0.09) at the brightness of 100-1000 cdm(-2). (c) 2015 Wiley Periodicals, Inc.