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“Click” Synthesis of a Bipolar Dendrimer as a Host Material for Electrophosphorescent Devices
Author(s) -
Yang Jun,
Ye Tengling,
Zhang Qing,
Ma Dongge
Publication year - 2010
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201000197
Subject(s) - dendrimer , pedot:pss , materials science , thermal stability , oxadiazole , cycloaddition , polymer chemistry , photochemistry , chemistry , polymer , catalysis , organic chemistry , composite material
A new solution‐processable bipolar dendrimer with carbazole units as hole‐transporting units and oxadiazole units as electron‐transporting units was efficiently synthesized based on a convergent approach by alternation of a Cu‐catalyzed azide/alkyne cycloaddition reaction and Williamson ether synthesis. The orthogonal chemistry completely avoided protection and activation of the focal points in the process of dendrimer synthesis. The dendrimer showed a wide bandgap and good thermal stability. Electrophosphorescent devices with the configuration ITO/PEDOT:PSS/bipolar dendrimer:Ir(ppy) 3 /TPBI/LiF/Al were fabricated. The devices showed a maximum current efficiency of 16.8 cd · A −1 , a maximum power efficiency of 4.22 lm · W −1 and an external quantum efficiency of 5.7%.