Add time:09/05/2019         Source:sciencedirect.com

A promising fluorene derivative 9,9-bis{4-[di-(p-biphenyl)aminophenyl]}fluorene (BPAPF) of high glass-transition temperature (Tg=167 °C) was synthesized and assessed as the hole-transporting material (HTM) in electroluminescent devices. Devices of various configurations, such as single-heterojunction, with or without dopant, and double-heterojunction devices were made. Superior performance was observed for devices based on BPAPF as the HTM, relative to that based on NPB (4,4′-bis[N-(1-naphthyl)-N-phenyl-amino]-biphenyl). In particular, with a device structure of ITO/BPAPF/Alq:0.5% quinacridone/Alq/Mg:Ag, a maximum luminance of ∼140,000 cd/m2 was obtained at 15 V and maximum luminance and external quantum efficiencies of 13.7 cd/A and 4.1%, respectively, were obtained at 5.5 V.

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