Light-emitting device, light-emitting substrate and method for manufacturing the same, and light-emitting apparatus

Patent metadata

Field	Value
Publication number	US-12057532-B2
Application number	US-202017610400-A
Country	US
Kind code	B2
Filing date	Nov 19, 2020
Priority date	Nov 19, 2020
Publication date	Aug 6, 2024
Grant date	Aug 6, 2024

Abstract

A light-emitting device includes: a light-emitting element; a light conversion layer disposed on a light exit side of the light-emitting element and including a first portion and a second portion located on a side of the first portion in a first direction; a first material layer disposed between the light-emitting element and the light conversion layer and configured such that light emitted by the light-emitting element is incident into the light conversion layer; and a second material layer on a side of the first material layer in the first direction, a third material layer on a side face of the light conversion layer, and a fourth material layer on a side of the light conversion layer away from the light-emitting element, which are configured such that light unconverted by the light conversion layer is reflected on surfaces of a structure formed by the second, third and fourth material layers.

First claim

What is claimed is:

1. A light-emitting device, comprising:
a light-emitting element including a light exit surface;
a light conversion layer disposed on a light exit side of the light-emitting element, wherein the light conversion layer includes a first portion and a second portion located on a side of the first portion in a first direction, the first direction being perpendicular to a thickness direction of the light-emitting element; and an orthogonal projection of the first portion on a plane perpendicular to the thickness direction of the light-emitting element overlaps with an orthogonal projection of the light exit surface on the plane;
a first material layer disposed between the light-emitting element and the light conversion layer, wherein an orthogonal projection of the first material layer on the plane overlaps with the orthogonal projection of the light exit surface on the plane;
a second material layer located on a side of the first material layer in the first direction, wherein an orthogonal projection of the second material layer on the plane overlaps with an orthogonal projection of the second portion on the plane;
a third material layer located on a side face of the light conversion layer, wherein an orthogonal projection of the third material layer on the plane overlaps with the orthogonal projection of the light exit surface on the plane;
a fourth material layer located on a side of the light conversion layer away from the light-emitting element, wherein
the first material layer is configured such that a portion of light emitted by the light-emitting element corresponding to a region where the first material layer is located is incident into the light conversion layer through the first material layer, so that the light conversion layer converts a wavelength of the light emitted by the light-emitting element; and
the second material layer, the third material layer and the fourth material layer are configured such that light unconverted by the light conversion layer is reflected on surfaces of a structure formed by the second material layer, the third material layer and the fourth material layer, and light converted by the light conversion layer exits through the fourth material layer.

2. The light-emitting device according to claim 1 , wherein
the first portion of the light conversion layer includes a first surface and a second surface that are sequentially arranged in a light exit direction of the light-emitting element; the second portion of the light conversion layer includes a third surface and a fourth surface that are sequentially arranged in the light exit direction of the light-emitting element;
the first surface is in contact with the first material layer, and the second surface is in contact with the third material layer; the third surface is in contact with the second material layer, and the fourth surface is in contact with the fourth material layer;
a surface of the third material layer in contact with the second surface is an inclined surface, and an included angle between the inclined surface and the first surface is α;
the inclined surface intersects with a plane where the first surface is located at a straight line, and a section of the light conversion layer is in a shape of a right trapezoid in a sectional direction perpendicular to the straight line; and
a ratio of each of a refractive index of the first material layer and a refractive index of the fourth material layer to a refractive index of the light conversion layer is less than sin α; a ratio of a refractive index of the second material layer to the refractive index of the light conversion layer is less than sin α, and/or, at least a surface of the second material layer in contact with the third surface is a reflective surface; a ratio of a refractive index of the third material layer to the refractive index of the light conversion layer is less than sin α, and/or, at least a surface of the third material layer in contact with the second surface is a reflective surface.

3. The light-emitting device according to claim 2 , wherein
the light conversion layer further includes a fifth surface opposite to the second surface; and
the light-emitting device further comprises a fifth material layer disposed on the fifth surface; and a ratio of a refractive index of the fifth material layer to the refractive index of the light conversion layer is less than sin α, and/or, at least a surface of the fifth material layer in contact with the fifth surface is a reflective surface.

4. The light-emitting device according to claim 2 , wherein
α is less than or equal to 60°.

5. The light-emitting device according to claim 2 , wherein
α is equal to 60°, the surface of the third material layer in contact with the second surface is the reflective surface, a length of a top side of the right trapezoid is 3n times a length of the light exit surface of the light-emitting element in the first direction, and a height of the right trapezoid is √{square root over (3)} times the length of the light exit surface of the light-emitting element in the first direction, n being an integer greater than or equal to 1.

6. The light-emitting device according to claim 2 , wherein
α is not equal to 60°, the surface of the third material layer in contact with the second surface is the reflective surface, and the light-emitting device further comprises a filter film disposed on a side of the fourth material layer away from the light conversion layer and configured to filter the light emitted by the light-emitting element.

7. The light-emitting device according to claim 2 , wherein
at least the surface of the third material layer in contact with the second surface is the reflective surface, and the third material layer includes a support layer and a metal reflective layer disposed on a surface of the support layer facing the light conversion layer, wherein a surface of the metal reflective layer facing the light conversion layer is a reflective surface.

8. The light-emitting device according to claim 1 , wherein
a material of the light conversion layer includes a quantum dot luminescent material, and the material of the light conversion layer does not include scattering particles.

9. The light-emitting device according to claim 1 , wherein
the light-emitting element is a light-emitting diode; and
the light-emitting device further comprises a light extraction structure disposed between the light-emitting element and the first material layer, and configured to cause the light emitted by the light-emitting element to be incident into the first material layer vertically.

10. The light-emitting device according to claim 1 , further comprising a lens structure disposed on a light exit surface of the fourth material layer, wherein
the lens structure is configured to diffuse light exiting from the fourth material layer.

11. A light-emitting substrate, comprising:
a base; and
a plurality of light-emitting devices disposed on the base; wherein
at least one light-emitting device is the light-emitting device according to claim 1 .

12. The light-emitting substrate according to claim 11 , wherein the at least one light-emitting device includes at least two light-emitting devices, and the light conversion layer of each light-emitting device in the at least two light-emitting devices includes a fifth surface opposite to a second surface that is in contact with the third material layer; the at least two light-emitting devices include at least one first light-emitting device and at least one second light-emitting device that are sequentially arranged in the first direction and adjacent; and the third material layer o

Assignees

• Boe Technology Group Co Ltd

Inventors

• Lu Tianhao
• Huang Wei
• Zhao Dejiang
• Tian Yu
• Liu Xiaoyun
• Sun Qian
• Jin Qian
• Li Yang

Classifications

• H10W90/00

  Package configurations · CPC title

• H10H20/0361

  of wavelength conversion means · CPC title

• H10H20/034

  of coatings · CPC title

• H10H20/855 Primary

  Optical field-shaping means, e.g. lenses · CPC title

• H10H20/841

  Reflective coatings, e.g. dielectric Bragg reflectors · CPC title