Ter(9,9-diarylfluorene)s: Highly Efficient Blue Emitter with Promising Electrochemical and Thermal Stability

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• 作者：Ken-Tsung Wong ; Yuh-Yih Chien ; Ruei-Tang Chen ; Chung-Feng Wang ; Yu-Ting Lin ; Huo-Hsien Chiang ; Ping-Yuan Hsieh ; Chung-Chih Wu ; Chung Hsien Chou ; Yuhlong Oliver Su ; Gene-Hsiang Lee ; and Shie-Ming Peng
• 刊名：Journal of the American Chemical Society
• 出版年：2002
• 出版时间：October 2, 2002
• 年：2002
• 卷：124
• 期：39
• 页码：11576 - 11577
• 全文大小：58K
• 年卷期：v.124,no.39(October 2, 2002)
• ISSN：1520-5126

文摘

Novel ter(9,9-diarylfluorene)s were synthesized by a Suzuki-coupling reaction of 2-bromofluorene (1) and 2,7-fluorenediboronic ester derivatives (3) with high isolated yields (63-86%). The X-ray structure analysis of ter(9,9'-spirobifluorene) (4aa) revealed that the conjugated chromophore adopts a helical conformation. This conformation effectively releases the steric interaction between the fluorene moieties and prevents inter-chromophore interactions. The introduction of aryl groups at the C9 position of fluorene was highly beneficial to the thermal and morphological stability of these oligomers. These terfluorenes exhibit intense blue fluorescence with excellent quantum yields both in solution (~100%) and in solid state (66-90%), and possess interesting reversible redox properties. Highly efficient blue light-emitting OLED devices were fabricated using 4aa and 4cc as emitters as well as hole transporters. The devices exhibit low turn-on voltage (~3 V) and high EL external quantum efficiency (2.5-3%).