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US 2014/0231787 A1Published application
White organic el element and illuminating apparatus and display apparatus using the same
AssigneeCanon Kabushiki Kaisha
InventorsKoichi Ishige, Hiroshi Tanabe, Jun Kamatani, Naoki Yamada, Akihito Saitoh
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Abstract
The present invention provides a white organic EL element improved in durability characteristic. A light-emitting layer has a laminated configuration including a first light-emitting layer and a second light-emitting layer. A difference in LUMO energy between a host and a blue light-emitting dopant of the first light-emitting layer is set to be larger than a difference in HOMO energy.
Claims8
A white organic EL element comprising:
- an anode;
- a cathode;
- and
- a plurality of laminated light-emitting layers arranged between the anode and cathode,
- wherein the plurality of light-emitting layers contain respective dopants having different emission colors;
- among the plurality of light-emitting layers, the light-emitting layer closest to the cathode side contains a first host and a blue light-emitting dopant, and the other light-emitting layers contain a green light-emitting dopant and a red light-emitting dopant;
- and
- Lh1−Lg1>Hg1−Hh1 is satisfied, wherein Lh1 is the lowest unoccupied molecular orbital energy of the first host, Hh1 is the highest occupied molecular orbital energy of the first host, Lg1 is the lowest unoccupied molecular orbital energy of the blue light-emitting dopant, and Hg1 is the highest occupied molecular orbital energy of the blue light-emitting dopant.
5 more elements
Dependencies are inferred from the claim text.