Organic electroluminescent device
AssigneeKabushiki Kaisha Toshiba
InventorSyun Egusa
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Abstract
An organic electroluminescent device is constituted by first and second electrodes opposing each other and a multilayered body having a plurality of organic films sandwiched between the electrodes and including an electroluminescent layer. A donor impurity is doped in a first organic film in contact with the first electrode, and an acceptor impurity is doped in a second organic film in contact with the second electrode. A third organic film sandwiched between the first and second organic films serves as an electroluminescent layer. A material having a band gap narrower than those of the first and second organic films is selected as a material of the third organic film so as to confine carriers. No impurity is doped in the third organic film.
Claims11
An organic electroluminescent device comprising first and second electrodes opposing each other:
- a first organic film formed in contact with said first electrode and doped with a donor impurity;
- a second organic film formed in contact with said second electrode and doped with an acceptor impurity;
- and
- a third organic film sandwiched between said first and second organic films, serving as an electroluminescent layer, having a band gap narrower than those of said first and second organic films and not doped with an impurity.
An organic electroluminescent device comprising:
- a multilayered body constituted by a first organic film not doped with an impurity and serving as an electroluminescent layer, and a second organic film forming a blocking contact with respect to said first organic film and doped with an acceptor impurity;
- a first electrode, formed on the first organic film side of said multilayered body, for injecting electrons;
- and
- a second electrode, formed on the second organic film side of said multilayered body, for injecting holes.
An organic electroluminescent device comprising:
- a multilayered body constituted by a first organic film doped with a donor impurity, and a second organic film forming a blocking contact with respect to said first organic film, not doped with an impurity, and serving as an electroluminescent layer;
- a first electrode, formed on the first organic film side of said multilayered body, for injecting electrons;
- and
- a second electrode, formed on the second organic film side of said multilayered structure, for injecting holes.
Dependencies are inferred from the claim text.