Intermolecular interactions play a crucial role in the performance of organic light-emitting diodes (OLEDs). Here we report the photophysical and electroluminescence properties of a fac-tris(2-phenylpyridyl)iridium(III) cored dendrimer in which highly branched biphenyl dendrons are used to control the intermolecular interactions. The presence of fluorene surface groups improves the solubility and enhances the efficiency of photoluminescence, especially in the solid state. The emission peak of the dendrimer is around 530 nm with a PL quantum yield of 76 % in solution and 25 % in a film. The photophysical properties of this dendrimer are compared with a similar dendrimer with the same structure but without the fluorene surface groups. Dendrimer LEDs (DLEDs) are prepared using each dendrimer as a phosphorescent emitter blended in a 4,4'-bis(N-carbazolyl)biphenyl host. Device performance is improved significantly by the incorporation of an electron-transporting layer of 1,3,5-tris(2-N-phenylbenzimidazolyl)benzene. A peak external quantum efficiency of 10 % (38 Cd A(-1)) for the dendrimer without surface groups and 13 % (49.8 Cd A(-1)) for the dendrimer with fluorene surface groups is achieved in the bilayer LEDs.
机构:
Dalian Univ Technol, Sch Chem Engn, State Key Lab Fine Chem, Dalian 116024, Peoples R ChinaDalian Univ Technol, Sch Chem Engn, State Key Lab Fine Chem, Dalian 116024, Peoples R China
Li, Wei
Li, Jiuyan
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Dalian Univ Technol, Sch Chem Engn, State Key Lab Fine Chem, Dalian 116024, Peoples R ChinaDalian Univ Technol, Sch Chem Engn, State Key Lab Fine Chem, Dalian 116024, Peoples R China
Li, Jiuyan
Wang, Miao
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Dalian Univ Technol, Sch Chem Engn, State Key Lab Fine Chem, Dalian 116024, Peoples R ChinaDalian Univ Technol, Sch Chem Engn, State Key Lab Fine Chem, Dalian 116024, Peoples R China
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Toshiba Co Ltd, Corp Res & Dev Ctr, Saiwai Ku, 1 Komukai Toshiba Cho, Kawasaki, Kanagawa 2128582, JapanToshiba Co Ltd, Corp Res & Dev Ctr, Saiwai Ku, 1 Komukai Toshiba Cho, Kawasaki, Kanagawa 2128582, Japan
Sawabe, Tomoaki
Takasu, Isao
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Toshiba Co Ltd, Corp Res & Dev Ctr, Saiwai Ku, 1 Komukai Toshiba Cho, Kawasaki, Kanagawa 2128582, JapanToshiba Co Ltd, Corp Res & Dev Ctr, Saiwai Ku, 1 Komukai Toshiba Cho, Kawasaki, Kanagawa 2128582, Japan
Takasu, Isao
Mizuno, Yukitami
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Toshiba Co Ltd, Corp Res & Dev Ctr, Saiwai Ku, 1 Komukai Toshiba Cho, Kawasaki, Kanagawa 2128582, JapanToshiba Co Ltd, Corp Res & Dev Ctr, Saiwai Ku, 1 Komukai Toshiba Cho, Kawasaki, Kanagawa 2128582, Japan
Mizuno, Yukitami
Sugizaki, Tomoko
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Toshiba Co Ltd, Corp Res & Dev Ctr, Saiwai Ku, 1 Komukai Toshiba Cho, Kawasaki, Kanagawa 2128582, JapanToshiba Co Ltd, Corp Res & Dev Ctr, Saiwai Ku, 1 Komukai Toshiba Cho, Kawasaki, Kanagawa 2128582, Japan
Sugizaki, Tomoko
Wada, Atsushi
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Toshiba Co Ltd, Corp Res & Dev Ctr, Saiwai Ku, 1 Komukai Toshiba Cho, Kawasaki, Kanagawa 2128582, JapanToshiba Co Ltd, Corp Res & Dev Ctr, Saiwai Ku, 1 Komukai Toshiba Cho, Kawasaki, Kanagawa 2128582, Japan
Wada, Atsushi
Ono, Tomio
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Toshiba Co Ltd, Corp Res & Dev Ctr, Saiwai Ku, 1 Komukai Toshiba Cho, Kawasaki, Kanagawa 2128582, JapanToshiba Co Ltd, Corp Res & Dev Ctr, Saiwai Ku, 1 Komukai Toshiba Cho, Kawasaki, Kanagawa 2128582, Japan
Ono, Tomio
Yoshida, Jiro
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Toshiba Co Ltd, Corp Res & Dev Ctr, Saiwai Ku, 1 Komukai Toshiba Cho, Kawasaki, Kanagawa 2128582, JapanToshiba Co Ltd, Corp Res & Dev Ctr, Saiwai Ku, 1 Komukai Toshiba Cho, Kawasaki, Kanagawa 2128582, Japan
Yoshida, Jiro
Enomoto, Shintaro
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Toshiba Co Ltd, Corp Res & Dev Ctr, Saiwai Ku, 1 Komukai Toshiba Cho, Kawasaki, Kanagawa 2128582, JapanToshiba Co Ltd, Corp Res & Dev Ctr, Saiwai Ku, 1 Komukai Toshiba Cho, Kawasaki, Kanagawa 2128582, Japan
Enomoto, Shintaro
Hirao, Akiko
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Toshiba Co Ltd, Corp Res & Dev Ctr, Saiwai Ku, 1 Komukai Toshiba Cho, Kawasaki, Kanagawa 2128582, JapanToshiba Co Ltd, Corp Res & Dev Ctr, Saiwai Ku, 1 Komukai Toshiba Cho, Kawasaki, Kanagawa 2128582, Japan
Hirao, Akiko
Amemiya, Isao
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Toshiba Co Ltd, Corp Res & Dev Ctr, Saiwai Ku, 1 Komukai Toshiba Cho, Kawasaki, Kanagawa 2128582, JapanToshiba Co Ltd, Corp Res & Dev Ctr, Saiwai Ku, 1 Komukai Toshiba Cho, Kawasaki, Kanagawa 2128582, Japan
Amemiya, Isao
Adachi, Chihaya
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Kyushu Univ, Ctr Future Chem, Fukuoka 8190395, JapanToshiba Co Ltd, Corp Res & Dev Ctr, Saiwai Ku, 1 Komukai Toshiba Cho, Kawasaki, Kanagawa 2128582, Japan
Adachi, Chihaya
[J].
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2010,
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