Light emitting device and compounds for use therein
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Issued Date -
Feb 24, 2005
app pub date -
Oct 12, 2004
filing date -
Nov 16, 2001
priority date (Note) -
Abandoned
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Abstract
There is disclosed a light emitting device comprising at least one compound of formula (I), (II) or (III) wherein R.sub.1 and R.sub.2, which may be the same or different, are organic substituents not including H, and wherein R.sub.3 and R.sub.5 are each independently selected from halo and organic substituents not including H, and wherein R.sub.4, R.sub.6, R.sub.7, R.sub.8, R.sub.9, and R.sub.10 are each independently selected from H, halo, and organic substituents, wherein any two or more of R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7, R.sub.8, R.sub.9, and R.sub.10 may optionally be fused together to form a ring system, provided that one of R.sub.3 and R.sub.5 is not part of a fused ring system, and provided that R.sub.1 and R.sub.2 are not fused to each other to form a ring system, and wherein one but not both of either (a) R.sub.3 and R.sub.4, or (b) R.sub.5 and R.sub.6, are fused to each other to form a ring system.
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