Organic electroluminescence device
AssigneeIdemitsu Kosan Co., Ltd.
InventorChishio Hosokawa
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Abstract
The invention provides an organic EL device with improved luminous efficiency. The device has a structure comprising an inorganic non-degenerate semiconductor layer 12, an organic light-emitting layer 14 and a counter electrode 16 as formed in that order on a lower electrode 10, in which the inorganic non-degenerate semiconductor layer 12 is formed of an amorphous material of In—Zn—Al—O and its band gap energy is 2.9 eV.
Claims4
An organic electroluminescent device having a structure of a first electrode layer which functions as a cathode, an inorganic non-degenerate semiconductor layer, at least one organic layer including an organic light-emitting layer, and a second electrode layer which functions as an anode, as laminated in that order, wherein said inorganic non-degenerate semiconductor layer is an oxide or oxynitride of an element combination selected from the group consisting of In and Zn;
- In, Zn and Al;
- Al, Zn and Si;
- In, Zn and Si;
- In, Zn and Ti;
- In, Zn and Sb;
- In, Zn and Yb;
- and In, Sn and Ta, and its band gap energy is higher than the band gap energy of the organic light-emitting layer, wherein the band gap energy of said inorganic non-degenerate semiconductor layer falls between 2.7 eV and 6.0 eV, and wherein said inorganic non-degenerate semiconductor layer provides electron conduction.
Dependencies are inferred from the claim text.