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US 10,707,436 B2Granted
Illumination device
AssigneeLG Display Co., Ltd.
InventorsJin-A You, Chang-Oh Kim, Jae-Min Moon, Ju-Hyuk Kwon
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Abstract
The present disclosure relates to an illumination device which is realized by an organic light emitting element having a plurality of stacks and which achieves an improvement in relation to the efficiency difference among wavelengths by changing a light emitting layer structure of a predetermined stack.
Claims6
An illumination device comprising a first electrode and a second electrode disposed opposite each other, and an organic stack filling a gap between the first electrode and the second electrode,
- wherein the organic stack comprises:
- a first stack disposed between the first electrode and the second electrode and having a first light emitting layer comprising a first dopant having a peak wavelength between 420 nm and 470 nm as an emitter;
- a second stack disposed between the first stack and the second electrode and having a second light emitting layer and a third light emitting layer that contacts the second light emitting layer;
- and
- a first charge generation layer disposed between the first stack and the second stack,
- wherein the second light emitting layer comprises, as emitters, a second dopant having a peak wavelength of 500 nm to 590 nm and a third dopant having a peak wavelength greater than the peak wavelength of the second dopant by 60 nm to 100 nm, and
- wherein the third light emitting layer has only a fourth dopant having a peak wavelength of 500 nm to 590 nm as an emitter.
4 more elements
Dependencies are inferred from the claim text.