Organic electroluminescent device with stabilizing cathode cappi

Details Organic electroluminescent device with stabilizing cathode cappi Organic electroluminescent device with stabilizing cathode cappi

1990-07-26

1991-10-22

O'Shea, Sandra L.

Electric lamp and discharge devices

With luminescent solid or liquid material

Solid-state type

313504, 428457, H05B 3326, B32B 1504

Patent

active

050598619

ABSTRACT:
An organic electroluminescent device is disclosed which is protected from dark spot formation. The device is comprised of, in sequence, a support, an anode, an organic electroluminescent medium, and a cathode containing a plurality of metals other than alkali metals. The cathode is comprised of a capping layer containing at least one alkaline earth or rare earth metal and, interposed between the capping layer and the organic electroluminescent medium, an electron injecting layer containing at least one metal having a work function of less than 4.0, but exhibiting a higher work function than the alkaline earth or rare earth metals in the capping layer.

REFERENCES:
patent: 3530325 (1970-09-01), Mehl et al.
patent: 3621321 (1971-11-01), Williams
patent: 4356429 (1982-10-01), Tang
patent: 4539507 (1985-09-01), Van Slyke et al.
patent: 4719152 (1988-01-01), Ohta et al.
patent: 4720432 (1988-01-01), Van Slyke et al.
patent: 4769292 (1988-09-01), Tang et al.
patent: 4885211 (1989-12-01), Tang et al.

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