Mes 2 B( p- 4,4‘-biphenyl-NPh(1-naphthyl)), (BNPB) a novel luminescent molecule that contains part of the well-known NPB functionality (NPB = N,N ‘ -di-1-naphthyl- N,N ‘ -diphenylbenzidine) and a three-coordinate boron center has been synthesized. BNPB is a bright blue emitter with λ max (emission) = 452 nm and a photoluminescent quantum yield of 95% in solution and 31% in the solid state. BNPB is an amorphous material and forms films readily via either solution casting or vacuum vapor deposition. A single layer EL device A with the device structure of ITO/BNPB/LiF/Al, two double-layer EL devices B and C with the device structure of ITO/NPB/BNPB/Ag for B and ITO/BNPB/Alq 3 /LiF/Al for C, and a triple-layer device D with the structure of ITO/NPB/BNPB/Alq 3 /LiF/Al have been fabricated and their performance has been evaluated. Device A produces a weak blue electroluminescence (EL). Device B produces a bright blue EL, identical to that of device A . Device C produces a green EL, typical of Alq 3 . Device D produces a broadband whitish-blue EL attributable to dual emission from the BNPB zone and the Alq 3 zone. Devices A − D demonstrate that BNPB is capable of transporting both holes and electrons in addition to being a blue emitter for EL devices.
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Jia et al. (2004) studied this question.
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