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US 5,093,210 AGranted
Electroluminescent device
AssigneeRicoh Company, Ltd.
InventorsMasafumi Ohta, Teruyuki Ohnuma, Fumio Kawamura, Yohta Sakon, Toshihiko Takahashi
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Abstract
Disclosed herein is an electroluminescent device having a luminescent layer comprising a luminescent material, which is capable of directly converting the energy of electric field applied thereto into a light energy and capable of providing a large surface-area luminescence.
Claims3
An electroluminescent device comprising an anode, a cathode and at least one organic compound layer sandwiched therebetween, at least one of said organic compound layers comprising an organic compound represented by the following formula (I) as the constituent ingredient:
- ##STR39## wherein R.sup.1 and R.sup.2 each independently represents a substituted or unsubstituted (C.sub.1 -C.sub.20) alkyl group, a substituted or unsubstituted carbocyclic aromatic ring, or a substituted or unsubstituted (5-membered) heterocyclic aromatic ring, or R.sup.1 and R.sup.2 together form a 5-15 membered ring;
- Ar.sup.1 represents a substituted or unsubstituted carbocyclic aromatic ring, or a substituted or unsubstituted (5-13 membered) heterocyclic aromatic ring;
- B represents --CH.dbd.CH).sub.n Ar.sup.2 or ##STR40## wherein X represents --CH.sub.2 CH.sub.2 --, --CH.dbd.CH--, --O--, --S-- or ##STR41## R.sup.3, R.sup.4 and R.sup.5 and independently represents a substituted or unsubstituted (C.sub.1 -C.sub.18) alkyl group, a substituted or unsubstituted carbocyclic aromatic ring, or a substituted or unsubstituted (6-membered) heterocyclic aromatic ring, Ar.sup.2 represents a substituted or unsubstituted (5-13 membered) heterocyclic aromatic ring, and
- n represents an integer of 1, 2 or 3.
1 more element
Dependencies are inferred from the claim text.