Organic compounds -- part of the class 532-570 series – Organic compounds – Amino nitrogen containing
Reexamination Certificate
2001-08-09
2002-01-29
Barts, Samuel (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Amino nitrogen containing
C313S506000
Reexamination Certificate
active
06342637
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a novel diamine hole transport agent, and, more particularly, to a novel diamine compound having an improved hole transport capability and a high glass transition temperature, and an organic electroluminescent device containing same.
BACKGROUND OF THE INVENTION
Generally, an organic electroluminescent device has a laminated structure comprising a transparent electrode layer, a metallic electrode layer, and an organic interlayer including an organic luminescent layer arranged between the two electrodes. The organic interlayer comprising an organic luminescent layer may further include a hole transport layer sandwiched between the transparent electrode layer and the organic luminescent layer, and may still further include an electron transport layer inserted between the metallic electrode layer and the organic luminescent layer, often in a multilayer configuration to increase luminous efficiency.
Hitherto, aromatic tertiary amines such as tetraphenylbiphenyldiamine (TPD), N-phenylcarbazole, 4,4′-bis[N-(1-naphthyl)-N-phenylamino]biphenyl(NPB) have been used in forming a hole transport layer.
However, due to the fact that the above-mentioned compounds have low glass transition temperatures ranging from 60 to 95° C., electroluminescent devices containing such hole transport agents have low heat stability, bad resistance to external impact, and short lifetime under hard environment.
Therefore, there has existed a need to develop a novel compound having a high glass transition temperature for use in an electroluminescent device with improved hole transport capability.
SUMMARY OF THE INVENTION
Accordingly, it is a primary object of the present invention to provide a novel compound having an improved hole transport capability and a high glass transition temperature, and an organic electroluminescent device containing same.
In accordance with one aspect of the present invention, there is provided a diamine compound of formula (I):
wherein, Ar
1
is a phenyl or biphenyl group, and Ar
2
is a phenylene or
group, Ar
1
and Ar
2
being optionally fused to form, together with the nitrogen atom attached thereto, substituted carbazole derivative.
REFERENCES:
patent: 5554450 (1996-09-01), Shi et al.
Chem Abstract Online Printout 128:68313; Abstract of JP 09298089 Published Nov. 18, 1997; See RN 15556-65-6.
Choi Dong-Kwon
Han Ki-jong
Kim Youngkoo
Lee Jae-Gyoung
Barts Samuel
Nessdisplay Co., Ltd.
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