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Two hole-transporting materials containing carbazole moieties with TPD- and NPB-like structures, 4,4′-bis [N-(4-carbazolylphenyl)-N-phenylamino]biphenyl(CPB) and 4,4′-bis[N-(4-carbazolylphenyl)-N-(1-naphthyl) amino]biphenyl(CNB), were synthesized via a modified Ullmann reaction. The resulting compounds were thermally stable with high glass transition temperatures ranging from 145 to 147 ℃ and possessed a good electrochemical reversibility and hole-transporting properties. Typical double-layer device evaluation with the structure ITO/CPB(40 nm)/Alq_3(60 nm)/LiF/Al demonstrated that they were promising hole-transporting materials with a current efficiency of 5.25 cd/A and a power efficiency of 2.00 lm/W.
Two hole-transporting materials containing carbazole moieties with TPD- and NPB-like structures, 4,4’-bis [N- (4-carbazolylphenyl) -N- phenylamino] biphenyl (CPB) (4-carbazolylphenyl) -N- (1-naphthyl) amino] biphenyl (CNB), were synthesized via a modified Ullmann reaction. The resulting compounds were thermally stable with high glass transition temperatures ranging from 145 to 147 ° C and possessed a good electrochemical reversible and hole-transporting properties. Typical double-layer device evaluation with the structure ITO / CPB (40 nm) / Alq_3 (60 nm) / LiF / Al demonstrated that they were promising hole-transporting materials with a current efficiency of 5.25 cd / A and a power efficiency of 2.00 lm / W.