Red fluorescent material and organic electroluminescent...

Details Red fluorescent material and organic electroluminescent... Red fluorescent material and organic electroluminescent...

2003-05-19

2004-11-23

Garrett, Dawn (Department: 1774)

Stock material or miscellaneous articles

Composite

Of inorganic material

C428S917000, C252S301160, C313S504000, C313S506000, C445S052000

Reexamination Certificate

active

06821651

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a novel compound having red-color luminescent characteristics, a process for the preparation thereof and an organic electroluminescent device containing same.
BACKGROUND OF THE INVENTION
Conventional red fluorescent materials used in organic electroluminescent devices generally belong to a class of compounds having an alkyl substituted nitrogen group, e.g., —N(CH
3
)
2
, as in 4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)4H-pyran (DCM).
However, such compounds exhibit low heat stability due to the presence of alkyl substituents, and give partial orange luminescent characteristics, failing to exhibit deep red.
SUMMARY OF THE INVENTION
Accordingly, it is a primary object of the present invention to provide a novel red fluorescent compound having improved thermostability and being capable of emitting color in the range of orange to deep red.
It is another object of the present-invention to provide a process for preparing said compound.
It is a further object of the present invention to provide an organic electroluminescent device comprising said compound.
In accordance with one aspect of the present invention, there is provided a novel red fluorescent compound of formula (I):
wherein,
X is CR
1
R
2
, NR′, oxygen or sulfur;
Y is NH, oxygen or sulfur;
R′, R
1
, R
2
, R
3
, R
4
, R
5
, R
6
and R
7
are each independently hydrogen, C
1-4
alkyl, C
1-4
alkoxy, aryl, or aryl substituted with C
1-4
alkyl or C
1-4
alkoxy, R
5
and R
6
being optionally fused to form a hetero-ring.


REFERENCES:
patent: 4948893 (1990-08-01), Chen et al.
patent: 5518825 (1996-05-01), Murayama et al.
patent: 5935720 (1999-08-01), Chen et al.
patent: 6455579 (2002-09-01), Satsuki et al.
Chen et al., Thin Solid Films, vol. 363, (2000), pp. 327-331.

Affiliated with

Also associated with

Rating

Red fluorescent material and organic electroluminescent... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Red fluorescent material and organic electroluminescent..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Red fluorescent material and organic electroluminescent... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3359030