# US 2014/0191273 A1 · Light-emitting arrangement

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- Number: US 2014/0191273 A1
- Document ID: US20140191273A1
- Status: Published application
- Kind: A1
- Application number: 14/241,496
- Filed: 2012-08-17
- Published: 2014-07-10
- Earliest claimed: 2011-09-09
- Assignees: Koninklijke Philips N.V.
- Inventors: Ties Van Bommel; Rifat Ata Mustafa Hikmet
- Web page: https://patentgrep.com/patent/US20140191273A1

## CPC

- F21V 9/38: Combination of two or more photoluminescent elements of different materials
- H10H 20/851: Wavelength conversion means
- H10H 20/8514: {characterised by their shape, e.g. plate or foil}
- H10H 20/8515: {not being in contact with the bodies}
- F21Y 2115/10: Light-emitting diodes [LED]
- H10H 20/84: Coatings, e.g. passivation layers or antireflective coatings
- H10H 20/8513: {having two or more wavelength conversion materials}
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- 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 light emitting arrangement is provided, comprising:—a light source capable of emitting light of a first wavelength range;—a primary wavelength converting domain arranged to receive light emitted by said light source and capable of converting at least part of the light of said first wavelength range into light of a second wavelength range;—a secondary wavelength converting domain arranged to receive ambient light and capable of converting light into light of a third wavelength range from 470 nm to less than 570 nm, wherein said primary wavelength converting domain is arranged between said light source and said secondary wavelength converting domain; and—an optical element arranged in the path of light between said primary and secondary wavelength converting domains. By using the suggested arrangement a desirable off-state green or greenish appearance is obtained, using minor amounts of phosphor and with high light extraction efficiency.

## Claims

### Claim 1

A light emitting arrangement, comprising:
a light source capable of emitting light of a first wavelength range;
a primary wavelength converting domain arranged to receive light emitted by said light source and capable of converting at least part of the light of said first wavelength range into light of a second wavelength range;
a secondary wavelength converting domain, arranged to receive ambient light and capable of converting light, optionally of said first wavelength range, into green light of a third wavelength range which ranges from 470 nm to 570 nm, wherein said primary wavelength converting domain is arranged between said light source and said secondary wavelength converting domain; and
an optical element arranged in the path of light between said primary and secondary wavelength converting domains.

### Claim 2 (depends on 1)

A light emitting arrangement according to claim 1, wherein said wavelength converting domains and said optical element are arranged at a remote location in relation to the light source.

### Claim 3 (depends on 1)

A light emitting arrangement according to claim 1, wherein said first wavelength range is from about 200 to 490 nm.

### Claim 4 (depends on 1)

A light emitting arrangement according to claim 1, wherein said secondary wavelength converting domain comprises an organic wavelength converting material.

### Claim 5 (depends on 1)

A light emitting arrangement according to claim 1, wherein said second wavelength range is in the wavelength range of from 500 to 800 nm.

### Claim 6 (depends on 1)

A light emitting arrangement according to claim 1, wherein said primary wavelength converting domain comprises an organic wavelength converting material.

### Claim 7 (depends on 1)

A light emitting arrangement according to claim 1, wherein the primary and/or the secondary wavelength converting domain comprises a carrier material.

### Claim 8 (depends on 1)

A light emitting arrangement according to claim 1, wherein the optical element is a diffuser, preferably comprising scattering elements dispersed in a carrier.

### Claim 9 (depends on 8)

A light emitting arrangement according to claim 8, wherein the optical element comprises a plurality of diffusers arranged in the path of light between the first domain and the second domain.

### Claim 10 (depends on 8)

A light emitting arrangement according to claim 8, wherein the optical element comprises a plurality of individual diffuser elements arranged in plane and mutually spaced apart.

### Claim 11 (depends on 1)

A light emitting arrangement according to claim 1, wherein the optical element comprises a prismatic structure.

### Claim 12 (depends on 1)

A light emitting arrangement according to claim 1, wherein the primary wavelength converting domain and/or the secondary wavelength converting domain comprises non-converting scattering particles.

### Claim 13 (depends on 1)

A light emitting arrangement according to claim 1, wherein the primary wavelength converting domain and the optical element, and/or the optical element and the secondary wavelength converting domain, are in direct optical contact.

### Claim 14 (depends on 1)

A light emitting arrangement according to claim 1, wherein in the functional off-state the light-emitting arrangement has a green or greenish appearance.

### Claim 15 (depends on 14)

A luminaire comprising at least one light emitting arrangement according to claim 14.