Lighting source using solid state emitter and phosphor materials

• US 8,764,225 B2
• Filed: 11/17/2010
• Issued: 07/01/2014
• Est. Priority Date: 05/05/2004
• Status: Active Grant

• Current Assignee: Rensselaer Polytechnic Institute
• Original Assignee: Rensselaer Polytechnic Institute
• Inventors: Narendran, Nadarajah, Gu, Yimin
• Primary Examiner(s): PAYNE, SHARON E
• Application Number:
  US12/947,899
• Publication Number:
  US 20110063830A1
• Time in Patent Office: 1,322 Days
• Field of Search: 362/231, 362/555, 362/558, 362/235, 362/293, 362/355, 362/84, 313/512, 313/498, 313/501
• US Class Current: 362/231
• CPC Class Codes: F21K 2/00 Non-electric light sources using luminescence using excitation by radioactivity G21H3/02, H01J65/06, H01J65/08; using excitation by an external electromagnetic field or by external corpuscular radiation H01J65/04; Light sources using electrochemiluminescence
• CPC Class Codes: F21K 9/64 using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
• CPC Class Codes: F21V 13/14 the elements being filters or photoluminescent elements, reflectors and refractors
• CPC Class Codes: F21V 3/02 characterised by the shape
• CPC Class Codes: F21V 5/004 using microlenses
• CPC Class Codes: F21V 7/06 with parabolic curvature
• CPC Class Codes: F21V 9/08 for producing coloured light, e.g. monochromatic; for reducing intensity of light with provision for controlling the colour F21V9/40
• CPC Class Codes: F21V 9/32 characterised by the arrangement of the photoluminescent material
• CPC Class Codes: F21V 9/38 Combination of two or more photoluminescent elements of different materials
• CPC Class Codes: F21V 9/45 by adjustment of photoluminescent elements
• CPC Class Codes: F21Y 2113/13 comprising an assembly of point-like light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: F21Y 2115/30 Semiconductor lasers
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H01L 2933/0091 Scattering means in or on the semiconductor body or semiconductor body package H01L33/22 takes precedence
• CPC Class Codes: H01L 33/507 the elements being in intimate contact with parts other than the semiconductor body or integrated with parts other than the semiconductor body
• CPC Class Codes: H01L 33/508 having a non-uniform spatial arrangement or non-uniform concentration, e.g. patterned wavelength conversion layer, wavelength conversion layer with a concentration gradient of the wavelength conversion material
• CPC Class Codes: H01L 33/58 Optical field-shaping elements

Abstract

An embodiment discloses a light-emitting apparatus including a light source for emitting a first light; a wavelength-converting layer, having a first arcuate shape, spaced apart from the light source, the wavelength-converting layer configured to absorb at least a portion of the first light and emit a second light; a transparent member disposed between the light source and the wavelength-converting layer; and a monolithic reflective layer having a second arcuate shape and configured to be reflective of at least the second light; wherein the wavelength-converting layer is positioned between the monolithic reflective layer and the light source, and the monolithic reflective layer is separated from the wavelength-converting layer by a space; and wherein the second light is configured to pass through the space before being reflected by the monolithic reflective layer.

Claims

1. A light-emitting apparatus comprising:

a light source for emitting a first light in a forward direction;

a wavelength-converting layer, having a first arcuate shape, spaced apart from the light source and disposed in a path of the first light, the wavelength-converting layer configured to absorb at least a portion of the first light and emit a second light;

a transparent member disposed between the light source and the wavelength-converting layer, wherein a width of the transparent member at an end adjacent the light source is different from a width of the transparent member at an end adjacent the wavelength-converting layer; and

a monolithic reflective layer having a second arcuate shape and configured to be reflective of at least the second light,

wherein the wavelength-converting layer is positioned between the monolithic reflective layer and the light source, and the monolithic reflective layer is separated from the wavelength-converting layer by a space;

wherein the second light is configured to pass through the space before being reflected by the monolithic reflective layer.

2. The light-emitting apparatus of claim 1, the transparent member is an optic device.

3. The light-emitting apparatus of claim 2, wherein the optic device includes at least one of a lens or a light guide having a light transmissive property.

4. The light-emitting apparatus of claim 1, wherein the reflective layer surrounds at least a portion of the optic device.

5. The light-emitting apparatus according to claim 1, wherein each of the monolithic reflective layer and the wavelength converting layer has a concave shape, and the monolithic reflective layer extends beyond an end portion of the wavelength-converting layer.

6. The light-emitting apparatus according to claim 1, wherein the second arcuate shape substantially conforms to the first arcuate shape.

7. The light-emitting apparatus according to claim 1, further comprising a second transparent member disposed between the wavelength-converting layer and the monolithic reflective layer.