Organic electroluminescent element

Stock material or miscellaneous articles – Composite – Of inorganic material

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Details

428691, 428917, 313503, 313504, 313509, H05B 3326

Patent

active

054298849

ABSTRACT:
Disclosed are organic EL elements having high environmental stability as well as high luminous efficiency and luminance. In an organic EL element comprising a transparent anode, a hole-carrying layer, a light-emitting layer and an alloy cathode consisting of a first metal Li and a stabilizing second metal Al, all laminated on a substrate, the concentration of the first metal Li contained in the alloy region with a predetermined thickness from the interface between the alloy cathode and the organic layer is controlled to a minute amount ranging from 0.005 wt. % to 0.3 wt. %. In another organic EL element comprising a transparent anode, a hole-carrying layer, a light-emitting layer and an alloy cathode consisting of a first metal Sr and a stabilizing second metal Mg, all laminated on a substrate, the concentration of the first metal Sr contained in the alloy region with a predetermined thickness from the interface between the alloy cathode and the organic layer (light-emitting layer or electron-carrying layer) is controlled to a minute amount ranging from 10 wt. % to 40 wt. %.

REFERENCES:
patent: 4356429 (1982-10-01), Tang
patent: 4885211 (1989-12-01), Tang et al.
patent: 5047687 (1991-09-01), VanSlyke
patent: 5059861 (1991-10-01), Littman et al.
patent: 5073446 (1991-12-01), Scozzafava et al.

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