2024-03-29T10:16:17Z
https://soar-ir.repo.nii.ac.jp/oai
oai:soar-ir.repo.nii.ac.jp:00013397
2022-12-14T03:47:16Z
1309:1310
Benzene substituted with bipyridine and terpyridine as electron-transporting materials for organic light-emitting devices
Ichikawa, Musubu
Yamamoto, Takayuki
Jeon, Hyeon-Gu
Kase, Kouki
Hayashi, Shuichi
Nagaoka, Makoto
Yokoyama, Norimasa
New electron-transporting materials for organic light-emitting devices (OLEDs) based on trisubstituted benzene with both bipyridine and terpyridine, 1,3-bisbipyridyl-5-terpyridylbenzene (BBTB) and 1-bipyridyl-3,5-bisterpyridylbenzene (BTBB), were developed. Glass transition temperatures of BBTB and BTBB were 93 degrees C and 108 degrees C, respectively, and BTBB was completely amorphous with no melting point. Electron mobilities of BTBB exceeded the order of 10(-4) cm(2) V-1 s(-1), while those of BBTB were very high and reached 10(-3) cm(2) V-1 s(-1) at an electric field of approximately 500 kV cm(-2). These high mobilities contributed to a low voltage operation. For example, in the case of the conventional aluminum trisquinolinol (Alq)-based fluorescent OLED with BTBB, current densities of 3.5 mA cm(-2) and 100 mA cm(-2) were reached at voltages of 3.0 V and 4.5 V, respectively. In addition, ionization potentials of BBTB (6.33 eV) and BTBB (6.50 eV) were sufficiently large to confine holes in common emissive layers.
Article
JOURNAL OF MATERIALS CHEMISTRY. 22(14):6765-6773 (2012)
journal article
ROYAL SOC CHEMISTRY
2012
application/pdf
JOURNAL OF MATERIALS CHEMISTRY
14
22
6765
6773
0959-9428
AA10822442
https://soar-ir.repo.nii.ac.jp/record/13397/files/Benzene_substituted_bipyridine_terpyridine_electron-transporting.pdf
eng
10.1039/c2jm16274a
https://doi.org/10.1039/c2jm16274a
J. Mater. Chem., 2012,22, 6765-6773 - Reproduced by permission of The Royal Society of Chemistry