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US 2021/0083218 A1Published application
Light emitting device and display device
AssigneeSharp Kabushiki Kaisha
InventorsTOKIYOSHI UMEDA, YUTO TSUKAMOTO, BAI ZHANG, SHINICHI KAWATO
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Abstract
A light-emitting device or the like with high color reproducibility and high luminous efficiency is achieved. The light-emitting device includes a blue pixel, a green pixel, and a red pixel, and the green pixel includes, in a green-light-emitting layer that emits light, a host material that transports carriers, a fluorescence dopant, which serves as a light emission dopant that contribute to light emission, and a thermally activated assist dopant which is composed of a thermally activated delayed fluorescent material.
Claims10
A light-emitting device comprising:
- n (n is a natural number of 2 or greater) electroluminescence elements configured to emit lights having light emission spectra of peak wavelengths different from each other,
- wherein each of the n electroluminescence elements includes a light-emitting layer configured to emit light,
- the light-emitting layer includes a host material configured to transport a carrier, and a light emission dopant configured to contribute to light emission, and
- m (1≤m≤n−1) of then electroluminescence elements include, in the light-emitting layer, a fluorescence dopant configured to serve as the light emission dopant, and further include a thermally activated assist dopant composed of a thermally activated delayed fluorescent material.
1 more element
Dependencies are inferred from the claim text.