Wide tuning of emission color of iridium (III) complexes from green to deep red via dicyanovinyl substituent effect on 2-phenylpyridine ligands

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• 作者：Dongdong Wang ; Yong Wu ; Bo Jiao ; Hua dong ; Guijiang Zhou ; Geng Wang ; Zhaoxin Wu
• 关键词：Dicyanovinyl group ; Iridium complexes ; Photoluminescence ; Substituent effect
• 刊名：Organic Electronics
• 出版年：2013
• 出版时间：September, 2013
• 年：2013
• 卷：14
• 期：9
• 页码：2233-2242
• 全文大小：1912 K

文摘

The synthesis, photophysical and electrochemical characteristics of new iridium complexes with electron-withdrawing dicyanovinyl group bound to phenylpyridine ligands are reported. The emission energy of these materials strongly depends on the position and substituent nature. A 154 nm wide tuning range of photoluminescence from the green () of iridium (III) bis(5-dicyanovinylphenylpyridinato)picolinate to the deep red emission () of iridium (III) bis(4-dicyanovinyl phenylpyridinato)picolinate has been achieved in solution. An unusually strong absorption capacity from 350 to 510 nm has been observed for the complex, iridium (III) bis(5-dicyanovinyl phenylpyridinato)picolinate, which also shows significantly different emission energy in solution and solid film. The performed DFT/TD-DFT calculations elucidated the substituent effects.