LIGHTING SOURCE USING SOLID STATE EMITTER AND PHOSPHOR MATERIALS

• US 20150116983A1
• Filed: 01/09/2015
• Published: 04/30/2015
• Est. Priority Date: 05/05/2004
• Status: Active Grant

• Current Assignee: Rensselaer Polytechnic Institute
• Original Assignee: Rensselaer Polytechnic Institute
• Inventors: Narendran, Nadarajah, Gu, Yimin
• Granted Patent: US 9,447,945 B2
• Time in Patent Office: Days
• US Class Current: 362/84
• 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

A light-emitting apparatus includes a substrate, a light source configured to emit light and arranged on the substrate, a phosphor layer being apart from the light source and configured to convert the light into forward transmitted light and backward transmitted light, and an optic device, being narrower than the substrate and having a transparent side wall, configured to direct at least a portion of the backward transmitted light through the transparent side wall and toward the substrate. In another aspect, a light-emitting apparatus includes a transparent base, a light source on the transparent base, a transparent material covering the light source, a phosphor layer on the transparent material, and a transparent wall on the phosphor layer.

Claims

1. A light-emitting apparatus comprising:

a substrate;

a light source configured to emit light and arranged on the substrate;

a phosphor layer being apart from the light source and configured to convert the light into forward transmitted light and, backward transmitted light; and

an optic device, being narrower than the substrate and having a transparent side wall, configured to direct at least a portion of the backward transmitted light through the transparent side wall and toward the substrate.

2. The light-emitting apparatus of claim 1, wherein the optic device directly contacts the light source.

3. The light-emitting apparatus of claim 1, wherein the transparent side wall is inclined against the substrate.

4. The light-emitting apparatus of claim 1, wherein the transparent side wall is substantially not a reflective surface.

5. The light-emitting apparatus of claim 1, further comprising a layer with scattering particles formed on the phosphor layer.

6. The light-emitting apparatus of claim 1, wherein the phosphor layer comprises a quantum dot, quantum dot crystals, or quantum dot nano crystals.

7. The light-emitting apparatus of claim 1, wherein the phosphor layer has a variable thickness.

8. A light-emitting apparatus comprising:

a transparent base;

a light source on the transparent base;

a transparent material covering the light source;

a phosphor layer on the transparent material; and

a transparent wall on the phosphor layer.

9. The light-emitting apparatus of claim 8, wherein the phosphor layer is substantially arranged at a central portion of the transparent wall.

10. The light-emitting apparatus of claim 8, further comprising a transparent side wall between the transparent base and the transparent wall.

11. The light-emitting apparatus of claim 10, wherein the phosphor layer is formed on the transparent side wall.

12. The light-emitting apparatus of claim 8, wherein the light source is configured to emit light passing through the transparent side wall and moving in a direction toward the transparent base.

13. The light-emitting apparatus of claim 8, wherein the transparent wall is wider than the transparent base.

14. The light-emitting apparatus of claim 8, wherein the light source comprises a plurality of light-emitting diodes.

15. The light-emitting apparatus of claim 8, wherein the phosphor layer comprises a quantum dot, quantum dot crystals, or quantum dot nano crystals.

16. The light-emitting apparatus of claim 8, wherein the phosphor layer has a variable thickness.