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US 9,287,520 B2Granted
Organic EL element, organic EL panel having organic EL element, organic EL light-emitting apparatus, and organic EL display apparatus
AssigneeJoled Inc.
InventorsHirofumi Fujita, Yoshiaki Tsukamoto, Shinya Fujimura, Satoru Ohuchi
Life of this patent
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Abstract
An organic EL element includes: an anode; a cathode; a buffer layer; and a hole injection layer between the anode and the buffer layer, the hole injection layer including a nickel oxide including both nickel atoms with a valence of three and nickel atoms with a valence of two. In the hole injection layer, a ratio of the number of nickel atoms with a valence of three to the number of nickel atoms with a valence of two, expressed in percentage, is equal to or greater than 60%.
Claims6
An organic EL element, comprising:
- an anode;
- a cathode;
- an organic functional layer between the anode and the cathode, the organic functional layer including an organic material;
- a metal oxide layer between the anode and the organic functional layer, the metal oxide layer including a nickel oxide including both nickel atoms with a valence of three and nickel atoms with a valence of two, wherein
- in the metal oxide layer, a ratio of the number of nickel atoms with a valence of three to the number of nickel atoms with a valence of two, expressed in percentage, is equal to or greater than 79.1%.
2 more elements
Dependencies are inferred from the claim text.