# US 12,111,050 B2 · Laser lighting device

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- Number: US 12,111,050 B2
- Document ID: US12111050B2
- Status: Granted
- Kind: B2
- Application number: 18/293,323
- Filed: 2022-07-25
- Published: 2024-08-15
- Granted: 2024-10-08
- Earliest claimed: 2021-07-29
- Applicants: Signify Holding B.V.
- Inventors: Rifat Ata Mustafa Hikmet; Ties Van Bommel
- Web page: https://patentgrep.com/patent/US12111050B2

## CPC

- F21V 9/32: characterised by the arrangement of the photoluminescent material
- C09K 11/7774: {Aluminates}
- F21V 7/24: characterised by the material
- F21V 9/30: Elements containing photoluminescent material distinct from or spaced from the light source (shades F21V1/17; globes, bowls or cover glasses F21V3/08, F21V3/12; refractors F21V5/10; reflectors F21V7/26, F21V7/30; elements with provision for controlling the spectral properties or intensity F21V9/40)
- F21V 29/70: characterised by passive heat-dissipating elements, e.g. heat-sinks
- H05B 47/105: in response to determined parameters
- F21Y 2115/30: Semiconductor lasers
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- F21Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED

## Abstract

A laser light source comprises a laser source and a ceramic phosphor tile having a light entry face for receiving laser light from the laser source for laser pumping by the laser light. A reflective coating is formed over a face opposite the light entry face. A metal layer is provided between a heat sink and the ceramic phosphor tile, wherein the metal layer has a melting point below 120° C. The metal layer thus becomes a liquid during operating temperatures, and this reduced strain on the phosphor layer while maintaining thermal contact.

## Claims

### Claim 1

A laser lighting device configured, in operation, to emit phosphor-converted light, the laser lighting device comprising:
a laser light source configured to, in operation, emit laser light;
a ceramic phosphor tile configured to receive laser light emitted by the laser light source, wherein the ceramic phosphor tile is configured for at least partly converting the laser light into the phosphor-converted light, the ceramic phosphor tile having a bottom face, a top face, and at least one side face arranged between the bottom face and the top face;
a reflective layer is configured over at least part of one or more of: the top face; the bottom face; and the at least one side face;
a heat sink;
a metal layer arranged between the heat sink and the reflective layer, wherein the metal layer has a melting point below 120° C.;
a protective layer arranged between the reflective layer and the metal layer to protect the reflective layer from the metal layer; and
wherein the laser lighting device is configured to have metal of the metal layer in liquid form during operation of the laser light source.

### Claim 2 (depends on 1)

The laser lighting device of claim 1, wherein the metal layer has a melting point above 35° C.

### Claim 3 (depends on 1)

The laser lighting device of claim 1, wherein the metal layer has a melting point below 70° C.

### Claim 4 (depends on 1)

The laser lighting device of claim 1, wherein the metal layer comprises an alloy comprising Gallium.

### Claim 5 (depends on 4)

The laser lighting device of claim 4, wherein the alloy further comprises one or more of tin, copper, silver, bismuth, indium, zinc and antimony.

### Claim 6 (depends on 4)

The laser lighting device of claim 4, wherein the ceramic phosphor tile comprises a luminescent material, wherein the luminescent material is selected from luminescent materials of the type A3B5O12:Ce, wherein A comprises one or more of Y, La, Gd, Tb and Lu, and wherein B comprises one or more of Al, Ga, In and Sc.

### Claim 7 (depends on 4)

The laser lighting device of claim 4, wherein the reflective layer comprises silver, aluminum, aluminum oxide, titanium dioxide, barium sulfate or boron nitride.

### Claim 8 (depends on 4)

The laser lighting device of claim 4, wherein the metal layer has a melting point in the range of 35° C.-70° C.

### Claim 9 (depends on 8)

The laser lighting device of claim 8, wherein the protective layer comprises nickel, titanium, and/or a metal oxide.

### Claim 10 (depends on 4)

The laser lighting device of claim 4, wherein the thermal conductivity of the metal layer is greater than 70 W/m·K.

### Claim 11 (depends on 4)

The laser lighting device of claim 4, wherein a stack of the reflective layer, the metal layer, the heat sink and the protective layer, cover:
the bottom face and at least part of the at least one side face; or
the side face and at least part of the bottom face.

### Claim 12 (depends on 4)

The laser lighting device of claim 4, wherein the ceramic phosphor tile, reflective layer and metal layer, and optionally a protective layer, are formed fixed into a well within the heat sink.

### Claim 13 (depends on 4)

The laser lighting device of claim 4, comprising a seal for sealing the metal layer.

### Claim 14 (depends on 4)

The laser lighting device of claim 4, comprising a temperature sensor for sensing a temperature of the metal layer and a controller for controlling the laser light source, wherein the laser light source is controlled by the controller based on the temperature sensed by the temperature sensor.

### Claim 15 (depends on 4)

A laser lighting system selected from the group of a lamp, a luminaire, a projector device, a disinfection device, and an optical wireless communication device, comprising the laser lighting device of claim 4.