Light-emitting element, exposure head and image-forming apparatus
AssigneeSeiko Epson Corporation
InventorsTetsuji Fujita, Hidetoshi Yamamoto
Life of this patent
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Abstract
A light-emitting element includes a cathode, an anode, a luminescent layer disposed between the cathode and the anode, a first electron transport layer disposed between the luminescent layer and the cathode, and a second electron transport layer in contact with the luminescent layer and the first electron transport layer between the luminescent layer and the first electron transport layer. The luminescent layer contains a red luminescent material emitting red light. The first electron transport layer contains a first electron transport material. The second electron transport layer contains a second electron transport material different from the first electron transport material.
Claims17
A light-emitting element comprising:
- a cathode;
- an anode;
- a luminescent layer disposed between the cathode and the anode, containing a naphthacene derivative, and a red luminescent material emitting red light, the red luminescent material being a diindenoperylene derivative;
- a first electron transport layer disposed between the luminescent layer and the cathode, containing a first electron transport material;
- and
- a second electron transport layer in contact with the luminescent layer and the first electron transport layer between the luminescent layer and the first electron transport layer, the second electron transport layer containing a second electron transport material different from the first electron transport material, the second electron transport layer further containing tris(8-quinolinolate)aluminum and a rubrene derivative.
A light-emitting element producing red light comprising:
- a cathode;
- an anode;
- a luminescent layer disposed between the cathode and the anode, containing a naphthacene derivative, and a red luminescent material emitting red light, the red luminescent material being a diindenoperylene derivative;
- a first electron transport layer disposed between the luminescent layer and the cathode, containing a first electron transport material;
- and
- a second electron transport layer in contact with the luminescent layer and the first electron transport layer between the luminescent layer and the first electron transport layer, the second electron transport layer containing a second electron transport material different from the first electron transport material, the second electron transport layer further containing tris(8-quinolinolate)aluminum and a rubrene derivative.
Dependencies are inferred from the claim text.