Organic electroluminescence element

Details Organic electroluminescence element Organic electroluminescence element

1991-12-13

1993-10-26

O'Shea, Sandra L.

Electric lamp and discharge devices

With luminescent solid or liquid material

Solid-state type

25230116, 428457, H05B 3314, H01J 162

Patent

active

052569454

ABSTRACT:
An organic EL element comprises a cathode, an EL layer of organic compound, a first hole transport layer of organic compound, a second hole transport layer of organic compound and an anode which are laminated in sequence, wherein the second hole transport layer is made of a substance represented by the following chemical formula 1: ##STR1## where R each independently represents a hydrogen atom, an alkyl group of from 1 to 6 carbon atoms, a halogen group, a cyano group, a nitro group, a primary, secondary or tertiary amino group, or an aryl group of from 6 to 15 carbon atoms. This organic EL element prevents a leakage current and emits light stably for a long time.

REFERENCES:
patent: 4720432 (1988-01-01), VanSlyke et al.
patent: 5104740 (1992-04-01), Shinkai et al.

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