Ter(9,9-diarylfluorene)s: Highly efficient blue emitter with promising electrochemical and thermal stability

被引:430
作者
Wong, KT [1 ]
Chien, YY
Chen, RT
Wang, CF
Lin, YT
Chiang, HH
Hsieh, PY
Wu, CC
Chou, CH
Su, YO
Lee, GH
Peng, SM
机构
[1] Natl Taiwan Univ, Grad Inst Electroopt Engn, Dept Elect Engn, Dept Chem, Taipei 106, Taiwan
[2] Natl Taiwan Univ, Grad Inst Elect Engn, Taipei 106, Taiwan
关键词
D O I
10.1021/ja0269587
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
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%). Copyright © 2002 American Chemical Society.
引用
收藏
页码:11576 / 11577
页数:2
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