Thin metal-oxide layer as stable electron-injecting electrode for light emitting diodes
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United States of America Patent
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May 13, 2003
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app pub date -
Oct 26, 2000
filing date -
Oct 14, 1998
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Abstract
This invention relates generally to the field of light emitting diodes (LEDs). More particularly, this invention relates to organic light emitting diodes which employ an electron-injecting cathode comprising a thin layer of an oxide of a low work function metal. More specifically, the present invention relates to LEDs which comprise: (a) a hole-injecting anode layer; (b) an electron-injecting cathode layer; and, (c) an emissive layer; wherein: (i) said emissive layer is interposed between said anode layer and said cathode layer; (ii) said emissive layer comprises an electroluminescent, semiconducting, organic material; (iii) said cathode layer comprises a layer of metal oxide having a thickness of from about 15 to about 200 .ANG.; and, (iv) said metal oxide is selected from the group consisting of alkali metal oxides, alkaline earth metal oxides, lanthanide metal oxides, and mixtures thereof.
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