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Organic Light-Emitting Diodes Using Triphenylamine Based Hole Transporting Materials

Published online by Cambridge University Press:  14 March 2011

Hisayoshi Fujikawa ,
Masahiko Ishii ,
Shizuo Tokito  and
Yasunori Taga
Hisayoshi Fujikawa
Affiliation:
TOYOTA Central Research and Development Labs., Inc. Nagakute, Aichi, 480-1192, JAPAN
Masahiko Ishii
Affiliation:
TOYOTA Central Research and Development Labs., Inc. Nagakute, Aichi, 480-1192, JAPAN
Shizuo Tokito
Affiliation:
TOYOTA Central Research and Development Labs., Inc. Nagakute, Aichi, 480-1192, JAPAN
Yasunori Taga
Affiliation:
TOYOTA Central Research and Development Labs., Inc. Nagakute, Aichi, 480-1192, JAPAN
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Abstract

The durability of the tris(8-quinolinolato) aluminum based light-emitting diode (LED) is related to the thermal stability of the hole transport layer. Several linear linkage triphenylamine oligomers were used for the hole transport layer. The thermal stability was clearly seen to depend on a glass transition temperature (Tg) of the hole transporting material, and a linear relationship between the Tg and the thermal stability was found. A lowering of “turn-on voltage” for light emission and an increase of luminous efficiency with increasing temperature was also observed. Excellent durability of the organic LED with a tetramer of triphenylamine was achieved at a high temperature of 120°C. Our results indicate that the linear linkage of triphenylamine leads to a high Tg and high device performance at high temperatures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 621: Symposia Q/R – Electron-Emissive Materials, Vacuum Microelectronics… , 2000 , Q3.4.1
Copyright
Copyright © Materials Research Society 2000

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References

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