IP Library › Granted Patent US 12690306
Granted Patent B2
US 12690306 · App. 18/447,299 · Granted Jul 21, 2026

Light-emitting device

Inventor: Toshiaki Yamashita (Komatsushima, JP)
Assignee: NICHIA CORPORATION
H10H20/841H10H20/8506H10H20/8515
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Quick Facts
Patent No.
US 12690306
App. No.
18/447,299
Granted
Jul 21, 2026
Kind
B2
Abstract

A light-emitting device includes first and second light-emitting elements, an optical member, and a wavelength conversion member. The optical member includes an optical action layer configured to reflect or transmit light in accordance with a wavelength of the light. The optical action layer is configured to reflect first emission light emitted from the first light-emitting element and second emission light emitted from the second light-emitting element. The wavelength conversion member is configured to receive the first emission light reflected by the optical action layer of the optical member, to convert a wavelength of the first emission light, and to emit a wavelength-converted light having a converted wavelength. The optical action layer of the optical member is configured to transmit the wavelength-converted light. The optical member is arranged so that the wavelength-converted light and the second emission light are emitted from an upward-facing surface of the optical action layer.

Claims (64)

1 . A light-emitting device comprising:

a first light-emitting element including a first light-emitting surface from which first emission light of a first emission color is emitted;

a second light-emitting element including a second light-emitting surface from which second emission light of a second emission color is emitted;

an optical member including an optical action layer configured to reflect or transmit light in accordance with a wavelength of the light, the optical action layer being configured to reflect the first emission light and the second emission light so that the first emission light and the second emission light do not pass through the optical action layer; and

a wavelength conversion member configured to receive the first emission light reflected by the optical action layer of the optical member, to convert a wavelength of the first emission light, and to emit a wavelength-converted light having a converted wavelength, wherein

the optical action layer of the optical member is configured to transmit the wavelength-converted light, and

the optical member is arranged so that the wavelength-converted light and the second emission light without being wavelength-converted by the wavelength conversion member are emitted from an upward-facing surface of the optical action layer.

2 . The light-emitting device according to claim 1 , wherein

the optical member further includes a light extraction surface, and the wavelength-converted light and the second emission light are emitted from the light extraction surface.

3 . The light-emitting device according to claim 2 , wherein

the first light-emitting element and the second light-emitting element are arranged such that the first light-emitting surface and the second light-emitting surface face each other with the optical member being interposed therebetween,

the optical member has a first surface, a second surface on an opposite side to the first surface, a third surface, and a fourth surface on an opposite side to the third surface,

the wavelength conversion member is disposed under the first surface,

the first light-emitting surface of the first light-emitting element faces the third surface, and the first emission light is incident on the third surface,

the second light-emitting surface of the second light-emitting element faces the fourth surface, and the second emission light is incident on the fourth surface,

the second surface is the light extraction surface, and

the optical action layer extends obliquely with respect to the first surface and the third surface inside the optical member.

4 . The light-emitting device according to claim 1 , wherein

the optical action layer of the optical member is configured to reflect light in a wavelength range of blue light and to transmit light in a wavelength range longer than the wavelength range of the blue light.

5 . The light-emitting device according to claim 4 , wherein

the optical action layer of the optical member is configured to reflect at least light in a wavelength range from 430 nm to 480 nm and to transmit at least light in a wavelength range equal to or greater than 500 nm.

6 . The light-emitting device according to claim 3 , further comprising

a reflection-transmission film arranged on the fourth surface of the optical member, and configured to transmit the second emission light and to reflect the wavelength-converted light having passed through the optical action layer.

7 . The light-emitting device according to claim 3 , further comprising:

a first reflective film configured to reflect the first emission light, the second emission light, and the wavelength-converted light; and

a second reflective film configured to reflect the first emission light, the second emission light, and the wavelength-converted light, wherein

the optical member includes

a fifth surface intersecting the first surface, the second surface, the third surface, and the fourth surface, and

a sixth surface intersecting the first surface, the second surface, the third surface and the fourth surface, and facing the fifth surface,

the first reflective film is arranged on the fifth surface, and

the second reflective film is arranged on the sixth surface.

8 . The light-emitting device according to claim 1 , wherein

the first emission color and the second emission color are the same color.

9 . The light-emitting device according to claim 2 , wherein

the first emission color and the second emission color are blue, and

white light is emitted from the light extraction surface of the optical member.

10 . The light-emitting device according to claim 1 , wherein

a difference between a main emission peak wavelength of the first light-emitting element and a main emission peak wavelength of the second light-emitting element is equal to or less than 20 nm.

11 . The light-emitting device according to claim 3 , wherein

the second surface of the optical member includes a rough-surface region, and

the second emission light is configured to pass through the rough-surface region of the second surface.

12 . The light-emitting device according to claim 1 , wherein

each of the first light-emitting element and the second light-emitting element is a semiconductor laser element.

13 . The light-emitting device according to claim 1 , further comprising

a driver configured to independently drive the first light-emitting element and the second light-emitting element for light emission.

14 . The light-emitting device according to claim 1 , further comprising

a package configured to house at least the first light-emitting element, the optical member, and the second light-emitting element.

15 . A light-emitting device, comprising:

a first light-emitting element including a first light-emitting surface from which first emission light of a first emission color is emitted;

a second light-emitting element including a second light-emitting surface from which second emission light of a second emission color is emitted;

an optical member including an optical action layer configured to reflect or transmit light in accordance with a wavelength of the light, the optical action layer being configured to reflect the first emission light and the second emission light so that the first emission light and the second emission light do not pass through the optical action layer; and

a wavelength conversion member configured to receive the first emission light reflected by the optical action layer of the optical member, to convert a wavelength of the first emission light, and to emit a wavelength-converted light having a converted wavelength, wherein

the optical action layer of the optical member is configured to transmit the wavelength-converted light,

the optical member is arranged so that the wavelength-converted light and the second emission light are emitted from an upward-facing surface of the optical action layer,

the optical member further includes a light extraction surface, and the wavelength-converted light and the second emission light are emitted from the light extraction surface,

the first light-emitting element and the second light-emitting element are arranged such that the first light-emitting surface and the second light-emitting surface face each other with the optical member being interposed therebetween,

the optical member has a first surface, a second surface on an opposite side to the first surface, a third surface, and a fourth surface on an opposite side to the third surface,

the wavelength conversion member is disposed under the first surface,

the first light-emitting surface of the first light-emitting element faces the third surface, and the first emission light is incident on the third surface,

the second light-emitting surface of the second light-emitting element faces the fourth surface, and the second emission light is incident on the fourth surface,

the second surface is the light extraction surface,

the optical action layer extends obliquely with respect to the first surface and the third surface inside the optical member, and

an upper end of the optical action layer does not intersect with the second surface of the optical member, and intersects with the third surface below an upper end of the third surface of the optical member.

16 . The light-emitting device according to claim 1 , wherein the optical action layer is a single plate having a linear cross-sectional shape.