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论文类型：期刊论文

发表时间：2011-10-21

发表刊物：JOURNAL OF MATERIALS CHEMISTRY

收录刊物：Scopus、SCIE、EI

卷号：21

期号：39

页面范围：15494-15500

ISSN号：0959-9428

摘要：Homoleptic tris-cyclometalated iridium(III) complexes containing 2-phenylbenzothiazole derivatives as ligands have been successfully synthesized and characterized for the first time. Electron-donating (CH(3), OCH(3)) and -withdrawing groups (F) were introduced into the 6-position of the benzothiazole moiety in the ligands to verify their influence on the optical and electronic properties of the complexes. Organic light-emitting diodes using these iridium complexes as doped emitters exhibited orange electrophosphorescence with excellent performances. An extremely high brightness of 95 800 cd m(-2) and a maximum luminance efficiency of 87.9 cd A(-1) (46.0 lm W(-1)) were achieved for the pristine complex without any substituent in the ligand. These performances represent a significant improvement for vacuum-deposited orange OLEDs and the new record of the efficiencies for orange OLEDs reported so far. The substituents in the ligand were observed to be rather unimportant to influence the performance of this series of iridium complexes.