US 12,740,225 B2 · Light-emitting element and display device

Abstract

The display device includes light-emitting elements. Each of light-emitting elements includes a light-emitting layer containing quantum dots each including a core and a shell larger in energy gap than the core; and a hole-transport layer, adjacent to the light-emitting layer containing a p-type doping material and an organic hole-transport material. The plurality of light-emitting elements includes: a first light-emitting element including a first light-emitting layer as the light-emitting layer; a second light-emitting element including a second light-emitting layer as the light-emitting laver; and a third light-emitting element including a third light-emitting layer as the light-emitting layer. A peak wavelength of light emitted by the first light-emitting layer is longer than a peak wavelength of light emitted by the second light-emitting layer. The peak wavelength of the light emitted by the second light-emitting layer is longer than a peak wavelength of light emitted by the third light-emitting layer.

Claims18

Dependent claims

A display device, comprising:

a plurality of light-emitting elements, each of the plurality of light-emitting elements including a light-emitting layer containing quantum dots, each quantum dot including a core and a shell larger in energy gap than the core;
and
a hole-transport layer containing a p-type doping material and an organic hole-transport material that contains a triphenylamine skeleton, the hole-transport layer disposed adjacent to the light-emitting layer,
wherein:
the plurality of light-emitting elements includes a first light-emitting element including a first light-emitting layer, as the light-emitting layer, a second light-emitting element including a second light-emitting layer, as the light-emitting layer, and a third light-emitting element including a third light-emitting layer, as the light-emitting layer,
a peak wavelength of light emitted by the first light-emitting layer is longer than a peak wavelength of light emitted by the second light-emitting layer, and
the peak wavelength of the light emitted by the second light-emitting layer is longer than a peak wavelength of light emitted by the third light-emitting layer.

4 more elements

A light-emitting element, comprising:

a light-emitting layer containing quantum dots, each quantum dot including a core and a shell larger in energy gap than the core;
and
a hole-transport layer containing a p-type doping material and an organic hole-transport material, and disposed adjacent to the light-emitting layer,
wherein;
an ionization potential of the organic hole-transport material is smaller than an ionization potential of the core of the quantum dots, and
the p-type doping material and the organic hole-transport material form a charge-transfer complex, and an ionization potential of the charge-transfer complex is smaller than, and within a range of 0.3 eV of, an ionization potential of the core.

3 more elements

Dependencies are inferred from the claim text.

Light-emitting element and display device

Life of this patent

Light-emitting element and display device

Life of this patent

Abstract

Claims18