Organic thin film electroluminescent device

Details Organic thin film electroluminescent device Organic thin film electroluminescent device

1995-05-17

1998-05-05

O'Shea, Sandra L.

Electric lamp and discharge devices

With luminescent solid or liquid material

Solid-state type

3151693, 428917, H05B 3300

Patent

active

057479305

ABSTRACT:
A cathode is formed of an alloy, which includes 0.01 to 5 mol % of scandium and 0.01 to 0.3 mol % of alkali metal. Base of the alloy has a work function greater than or equal to 4 eV and is silver, aluminum, or indium or the alloy thereof. Thickness of the cathode is preferably 1 to 30 nm. Also, as a cathode protection layer, an aluminum alloy is formed on the cathode in a thickness greater than or equal to 50 nm, the aluminum alloy containing 0.1 to 5 mol % of silicon, copper, scandium and/or manganese.

REFERENCES:
patent: 4885211 (1989-12-01), Tang et al.
patent: 5059861 (1991-10-01), Littman et al.
patent: 5458977 (1995-10-01), Hosokawa et al.
patent: 5516577 (1996-05-01), Matsuura et al.
Murayama et al., "Organic EL devices doped with a quinacridone derivative showing higher brightness and luminescent efficiency", Extended abstracts of the 54th Autumn Meeting (1993) The Japan Society of Applied Physics; No. 3 p. 1127.
C.W. Tang et al., "Organic Electroluminescent Diodes", Appl. Phys. Lett. 51 (12), Sep. 21, 1987, pp. 913 to 915.
H. Ishida et al., "First-Principles Study of the Covrge Dependence of the Elec Structure of Alkali-Metal-Metal . . . ", The American Phy. Soc., vol. 38, No. 8, Sep. 15, 1988, pp. 5752-5755.
H.B. Michaelson, "Relation Between An Atomic Electronegativity Scale and the Work Function", IBM, Journal of Research, vol. 22, No. 1, 1978, pp. 72-80.

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