Blue Light-Emitting Diodes Based on Dipyrazolopyridine Derivatives

A series of highly luminescent dipyrazolopyridine (PAP) dyes were synthesized and assessed as light-emitting materials in electroluminescent devices. Multilayer devices were fabricated using these dyes along with a hole-transporting material, NPB (4,4‘-bis[N-(1-naphthyl-1-)-N-phenyl-amino]-biphenyl)...

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Bibliographic Details
Published in:Chemistry of materials 2000-09, Vol.12 (9), p.2788-2793
Main Authors: Balasubramaniam, E, Tao, Y. T, Danel, A, Tomasik, P
Format: Article
Language:English
Subjects:
Applied sciences
Electronics
Exact sciences and technology
Optoelectronic devices
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
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Summary:A series of highly luminescent dipyrazolopyridine (PAP) dyes were synthesized and assessed as light-emitting materials in electroluminescent devices. Multilayer devices were fabricated using these dyes along with a hole-transporting material, NPB (4,4‘-bis[N-(1-naphthyl-1-)-N-phenyl-amino]-biphenyl) and an electron-transporting material, AlQ (tris(8-hydroxyquinoline) aluminum), or TPBI (2,2‘,2‘ ‘-(1,3,5-benzenetriyl)tris[1-phenyl-1H-benzimidazole]). Both ITO/NPB/PAP/AlQ/Mg:Ag and ITO/NPB/PAP/TPBI/Mg:Ag devices gave a bright blue or blue-green emission, depending on the substituent group in the parent PAP dye. The performance of these devices such as turn-on voltage, brightness, and efficiency as a function of the substituent is discussed.
ISSN:0897-4756
1520-5002
DOI:10.1021/cm0003368