Mes2B(p-4,4'-biphenyl-NPh(1-naphthyl)):  A Multifunctional Molecule for Electroluminescent Devices

WL Jia, XD Feng, DR Bai, ZH Lu, S Wang… - Chemistry of …, 2005 - ACS Publications
WL Jia, XD Feng, DR Bai, ZH Lu, S Wang, G Vamvounis
Chemistry of materials, 2005ACS Publications
Mes2B (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 λmax (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 …
Mes2B(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 λmax (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/Alq3/LiF/Al for C, and a triple-layer device D with the structure of ITO/NPB/BNPB/Alq3/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 Alq3. Device D produces a broadband whitish-blue EL attributable to dual emission from the BNPB zone and the Alq3 zone. Devices AD demonstrate that BNPB is capable of transporting both holes and electrons in addition to being a blue emitter for EL devices.
ACS Publications
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