Light emitting arrangement with adapted output spectrum

Patent metadata

Field	Value
Publication number	US-9500327-B2
Application number	US-201414904873-A
Country	US
Kind code	B2
Filing date	Jul 18, 2014
Priority date	Aug 1, 2013
Publication date	Nov 22, 2016
Grant date	Nov 22, 2016

Abstract

A light-emitting arrangement ( 100 ) is disclosed, which is adapted to produce white output light enhancing the color perception of e.g. food in retail environments. The light-emitting arrangement comprises at least one blue light-emitting element ( 102 ) adapted to emit light having an emission peak in a first wavelength range of from 440 to 460 nm, and at least one deep blue light-emitting element ( 101 ) adapted to emit light having an emission peak in a second wavelength range of from 400 to 440 nm. Further, the light-emitting arrangement comprises at least one narrow band wavelength converting material ( 104 ) arranged to receive light emitted by said deep blue light-emitting element, and at least one broadband wavelength converting material ( 105 ) arranged to receive light emitted by at least one of said blue light-emitting element and said deep blue light-emitting element. A spotlight comprising such a light-emitting arrangement, and an illumination device comprising a plurality of the light-emitting arrangements, is also disclosed.

First claim

The invention claimed is:

1. A light-emitting arrangement adapted to produce output light, comprising:
at least one blue light-emitting element adapted to emit light having an emission peak in a first wavelength range of from 440 to 460 nm;
at least one deep blue light-emitting element adapted to emit light having an emission peak in a second wavelength range of from 400 to 440 nm;
at least one narrow band wavelength converting material arranged to receive light emitted by said deep blue light-emitting element, wherein the narrow band wavelength converting material is adapted to emit light with a full width half maximum (FWHM) of less than 50 nm; and
at least one broadband wavelength converting material arranged to receive light emitted by at least one of said blue light-emitting element and said deep blue light-emitting element, wherein the broadband wavelength converting material is adapted to emit light with a full width half maximum (FWHM) of 50 nm or more.

2. A light-emitting arrangement according to claim 1 , wherein said at least one narrow band wavelength converting material is a narrow band red phosphor adapted to emit light having an emission peak in a red wavelength range.

3. A light-emitting arrangement according to claim 1 , wherein said at least one narrow band wavelength converting material is a narrow band green phosphor adapted to emit light having an emission peak in a green wavelength range.

4. A light-emitting arrangement according to claim 2 , wherein the at least one broadband wavelength converting material is a broadband green or yellow phosphor adapted to emit light having an emission peak in a green or yellow wavelength range.

5. A light-emitting arrangement according to claim 3 , wherein the at least one broadband wavelength converting material is a broadband red phosphor adapted to emit light having an emission peak in a red wavelength range.

6. A light-emitting arrangement according to claim 2 , wherein the narrow band red phosphor comprises the elements Mg, O, Ge and optionally Mn as a dopant.

7. A light-emitting arrangement according to claim 3 , wherein the narrow band green phosphor comprises the elements Si, Al, O, and N.

8. A light-emitting arrangement according to claim 1 , wherein at least a portion of the light emitted by the at least one deep blue light-emitting element forms part of the total output light.

9. A light-emitting arrangement according to claim 1 , wherein at least a portion of the at least one narrow band wavelength converting material is provided on said at least one deep blue light-emitting element.

10. A light-emitting arrangement according to claim 1 , wherein at least a portion of the broadband wavelength converting material is provided on said at least one blue and/or said at least one deep blue light-emitting element.

11. A light-emitting arrangement according to claim 1 , wherein at least one of the narrow band wavelength converting material and the broadband wavelength converting material is arranged remotely from said at least one deep blue light-emitting element.

12. An illumination device, comprising a plurality of light-emitting arrangements according to claim 1 , wherein the plurality of light-emitting arrangements are consecutively arranged along a length direction of the illumination device and wherein each comprises the deep blue light-emitting element, the blue light-emitting element, the narrow band wavelength converting material, and the broadband wavelength converting material.

13. A spotlight comprising at least one light-emitting arrangement according to claim 1 .

Assignees

• Koninklijke Philips Nv
• Philips Lighting Holding Bv

Inventors

• Oepts Wouter
• Peeters Martinus Petrus Joseph
• Van Lier Edwin Petronella Helena

Classifications

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title

• F21V9/32

  characterised by the arrangement of the photoluminescent material · CPC title

• F21V13/08

  the elements being filters or photoluminescent elements and reflectors · CPC title

• F21V9/38

  Combination of two or more photoluminescent elements of different materials · CPC title

• H10W90/00

  Package configurations · CPC title