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US 12,615,938 B2Granted
Organic light emitting device
AssigneeLG Display Co., Ltd.
InventorByungsoo Kim
Life of this patent
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Abstract
An organic light emitting device having a structure that a plurality of light emitting units are deposited, is disclosed, of which white color shift caused by variation of a viewing angle is reduced through a combination between dopant materials of the respective light emitting units. The organic light emitting device includes dopant materials emitting light of different wavelengths from the plurality of light emitting units. Therefore, in the organic light emitting device, variation of color and luminance, which is perceived by a user as a viewing angle is varied, may be reduced.
Claims12
An organic light emitting device, comprising:
- an anode;
- a first light emitting unit on the anode, the first light emitting unit including a first organic light emitting layer;
- a charge generating layer on the first light emitting unit;
- a second light emitting unit on the charge generating layer, the second light emitting unit including a second organic light emitting layer;
- and
- a cathode on the second light emitting unit,
- wherein the first light emitting unit includes a first electron blocking layer, and the second light emitting unit does not have an electron blocking layer,
- wherein a main dopant material is doped on any one of the first organic light emitting layer and the second organic light emitting layer, and
- an auxiliary dopant material emitting a same colored light as that of the main dopant material is doped on the other one among the first organic light emitting layer or the second organic light emitting layer having the main dopant material doped thereon,
- wherein a photoluminescence (PL) peak of the main dopant material is in a range of 0 nm to 15 nm from a PL peak of the auxiliary dopant material,
- wherein a peak of an out-coupling emittance spectrum curve at a viewing angle of 0° of the organic light emitting device is closer to the PL peak of the main dopant material than the PL peak of the auxiliary dopant material, and
- wherein a peak of an out-coupling emittance spectrum curve at a viewing angle of 60° of the organic light emitting device is closer to the PL peak of the auxiliary dopant material than the PL peak of the main dopant material.
9 more elements
Dependencies are inferred from the claim text.