New Organic Light-Emitting Materials: Synthesis, Thermal, Photophysical, Electrochemical, and Electroluminescent Properties

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• 作者：Shiyan Chen ; Xinjun Xu ; Yunqi Liu ; Wenfeng Qiu ; Gui Yu ; Huaping Wang ; Daoben Zhu
• 刊名：Journal of Physical Chemistry C
• 出版年：2007
• 出版时间：January 18, 2007
• 年：2007
• 卷：111
• 期：2
• 页码：1029 - 1034
• 全文大小：119K
• 年卷期：v.111,no.2(January 18, 2007)
• ISSN：1932-7455

文摘

A new series of organic-light-emitting materials, 6,7-dimethyl-2,3-di-(4'-diphenylamino-biphenyl-4-yl)-quinoxaline (MAPQ), 6,7-dimethyl-2,3-di-[4-(9,9-dibutyl-9H-fluoren-2-yl)-phenyl]-quinoxaline (MFPQ), 2,3-dicyano-5,6-di-[4-(9,9-dibutyl-9H-fluoren-2-yl)-phenyl]-pyrazine (CFPP), and 6,7-dicyano-2,3-di-[4-(9,9-dibutyl-9H-fluoren-2-yl)-phenyl]-quinoxaline (CFPQ), have been synthesized in high yields and fullycharacterized. These compounds have high thermal stability and show bright-light-emission varying fromblue to green owing to the different strengths of the donor and acceptor. Moreover, good reversible oxidationor reduction waves were observed except for compound MFPQ due to the potential limitation of the solventwe used, which suggests these compounds have potential applications for hole/electron transportation. Organiclight-emitting diodes were fabricated in a facile nondoped configuration based on these materials. Comparedto MFPQ, CFPP, and CFPQ, the higher lying HOMO level of MAPQ facilitates more efficient hole injection/transport and a higher charge-recombination rate; thus, the device based on MAPQ shows the highest luminousefficiency. For compounds CFPP and CFPQ, the LUMO levels are obviously decreased because of theincorporation of electron-accepting cyano group, so the devices based on these two compounds display betterelectron transportation/injection properties and better performances than those of MFPQ. These resultsdemonstrate that high-performance light-emitting devices can be achieved from intramolecular charge-transferemission.