Organic electroluminescent devices with high operational stability
AssigneeEastman Kodak Company
InventorsJianmin Shi, Ching W. Tang
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Abstract
An organic electroluminescent device of improved efficiency and operational stability has been disclosed. The device comprises of an anode and a cathode, and an organic electroluminescent element disposed between the anode and cathode. Characterized in the organic electroluminescent element is at least one fluorescent emitting layer containing a mixture of two or more materials. The mixture contains a quinacridone compound of the formula: ##STR1## where R.sub.3 and R.sub.4 are independently alkyl, aryl, fused aryl or halogen; and R.sub.5 and R.sub.6 are independently alkyl, substituted alkyl, aryl, or substituted aryl; and n=0, 1, 2 or 3.
Claims5
An organic EL device comprising an anode and a cathode, and an organic EL element disposed between the anode and cathode;
- characterized in that the organic EL element has at least one fluorescent emitting layer containing a mixture of two or more materials;
- the mixture contains a compound of the formula:
- ##STR17## where R.sub.3 and R.sub.4 are independently alkyl, alkoxyl, substituted alkyl, aryl, fused aryl halogen;
- and R.sub.5 and R.sub.6 are independently alkyl, alkoxyl, substituted alkyl, aryl, or substituted aryl;
- and n=0, 1, 2 or 3.
Dependencies are inferred from the claim text.