Organic light emitting device with increased service life

Details Organic light emitting device with increased service life Organic light emitting device with increased service life

2006-08-01

2006-08-01

Santiago, Mariceli (Department: 2879)

Electric lamp and discharge devices

With luminescent solid or liquid material

Solid-state type

C313S503000, C313S506000, C428S690000

Reexamination Certificate

active

07084564

ABSTRACT:
An OLED including an anode layer, a first mixing layer over the anode layer, a mixing layer on the first mixing layer, a second mixing layer on the mixing layer, and a cathode layer over the second mixing layer is provided. The mixing layer is a mixture of an organic light emitting material, a hole and an electron transport material, and a volume ratio of the hole transport material to the electron transport material thereof is X %. The first and second mixing layers are both mixtures of the hole and electron transport materials. A volume ratio of the hole transport material to electron transport material in the first mixing layer decreases gradually from 99% to X % starting from the surface adhered to the anode layer, and that of the second mixing layer increases gradually from X % to 99% starting from the surface adhered to the mixing layer.

REFERENCES:
patent: 6130001 (2000-10-01), Shi et al.
patent: 6798134 (2004-09-01), Wang

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