Doubly boron-doped pentacenes as emitters for OLEDs

摘要

A new class of benchtop-stable boron-doped pentacenes, i.e. , 5,14-dimesityl-5,14-dihydro-5,14-diborapentacene ( 3 ~(H) ) and its 2,3-dihalogenated derivatives, 3 ~(F) and 3 ~(Cl) , have been successfully applied as emitters in fluorescent organic light-emitting diodes (OLEDs). The best performance was achieved with 2% of the blue emitter 3 ~(H) doped in 9,10-di-(2-naphthyl)anthracene (ADN) as the emitting layer (turn-on voltage V _(on) = 3.3 V, λ _(em) = 476 nm, maximum external quantum efficiency η _(ext) = 3.4% with a negligible roll-off up to 10?000 cd m ~(?2) , maximum luminance L _(max) = 39?180 cd m ~(?2) ). Contrary to the blue-emitting 3 ~(H) -based device, 3 ~(F) - and 3 ~(Cl) -containing OLEDs produced turquoise (484 nm) and green (492 nm) light, respectively.