Light collector device

• US 9,310,540 B2
• Filed: 05/06/2013
• Issued: 04/12/2016
• Est. Priority Date: 05/07/2012
• Status: Expired due to Fees

• Current Assignee: Philips Lighting BV (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips N.V.
• Inventors: Boonekamp, Erik Paul, Nijkamp, Rick Gerhardus
• Primary Examiner(s): Mowla, Golam
• Application Number:
  US14/399,008
• Publication Number:
  US 20150083221A1
• Time in Patent Office: 1,072 Days
• Field of Search: 136/259, 362/84, 357/359
• US Class Current: 1/1
• CPC Class Codes: A01G 7/045 with electric lighting
• CPC Class Codes: A01G 9/14 Greenhouses cloches A01G13/04
• CPC Class Codes: A01G 9/243 Collecting solar energy in general F24S
• CPC Class Codes: A01G 9/249 Lighting means with special arrangements for promoting growth A01G7/045
• CPC Class Codes: F21V 13/14 the elements being filters or photoluminescent elements, reflectors and refractors
• CPC Class Codes: F21V 9/06 for filtering out ultraviolet radiation
• CPC Class Codes: F21V 9/38 Combination of two or more photoluminescent elements of different materials
• CPC Class Codes: F24S 23/12 Light guides
• CPC Class Codes: G02B 5/223 containing organic substances, e.g. dyes, inks or pigments
• CPC Class Codes: H01L 31/055 where light is absorbed and re-emitted at a different wavelength by the optical element directly associated or integrated with the PV cell, e.g. by using luminescent material, fluorescent concentrators or up-conversion arrangements
• CPC Class Codes: Y02A 40/25 Greenhouse technology, e.g. cooling systems therefor
• CPC Class Codes: Y02B 10/20 Solar thermal
• CPC Class Codes: Y02E 10/40 Solar thermal energy, e.g. solar towers
• CPC Class Codes: Y02E 10/52 PV systems with concentrators
• CPC Class Codes: Y02P 60/12 using renewable energies, e.g. solar water pumping
• CPC Class Codes: Y02P 60/14 Measures for saving energy, e.g. in green houses

Abstract

The invention provides a sheet-like light collector device comprising a light receiving side and a light exit side, and a plurality of curved structures of light guiding material comprising an organic dye configured to absorb at least part of the light of a light source and to convert at least part of the absorbed light into converted light in the visible wavelength range. Each curved structure has a convex curved part at the light receiving side, a concave part at the light exit side, and a light exit edge part at the light exit side. Each curved structure has a curvature and light guide thickness configured to facilitate transport of incoupled light and the visible converted light in the direction of the light exit edge part to provide device light escaping from the light exit edge part.

Claims

1. A sheet-like light collector device comprising a light receiving side and a light exit side, the light collector device comprising a plurality of curved structures of light guiding material, wherein the light guiding material comprises an organic light conversion dye for absorption of at least part of light of a light source and for conversion of at least part of the absorbed light into converted light in the visible and IR wavelength range, wherein each curved structure has a convex curved part at the light receiving side, for receiving light from said light source and for coupling light source light into the curved structure, a concave part at the light exit side, and a light exit edge part at the light exit side, wherein each curved structure has a curvature and a light guide thickness for facilitating transport of the incoupled light and the converted light in the direction of the light exit edge part to provide device light escaping from the light exit edge part.

2. The light collector device according to claim 1, wherein at least 20% of the surface area of the convex curved parts have a local curvature 0.2<

κ

R <

5 wherein κ

is the local curvature of a fitting circle in a cross-sectional plane of the convex curved part describing the local curvature, and wherein R is the radius of a ground plane.

3. The light collector device according claim 2, wherein each curved structure has a ground plane radius, wherein the curved structure has the shape of a sphere cap, wherein the convex curved part having said ground plane radius (R) has a curved structure surface area, wherein the curvature of the convex curved part has a normalized area in the range 2.5≦

S/R2≦

30, and has a light guide thickness which is selected from the range of 0.5-50 mm.

4. The light collector device according to claim 2, wherein the ratio of the light guide thickness and ground plane radius (d/R) is 0.001≦

d/R≦

0.25.

5. The light collector device according claim 2, having a ground plane radius selected from the range of 0.25-100 mm, and wherein the convex curved part having said ground plane radius has a curved structure surface area in the range of 10 mm2-0.3 m2.

6. The light collector device according to claim 1, wherein the curved structures have the shape of segments of 2D curved funnels, with larger first openings at the light receiving side and smaller second openings at the light exit side.

7. The light collector device according to claim 1, wherein the curved structures have the shape of segments of 2D curved indentations, with larger first openings at the light receiving side and a closed extending end comprising the light exit edge part at the light exit side.

8. The light collector device according to claim 1, wherein the curved structures have the shape of segments of hollow sphere caps, with convex curved parts at the light receiving side and concave parts at the light exit side.

9. The light collector device according to claim 6, comprising a hexagonal close packing or cubic close packing of similar curved structures.

10. The light collector device according to claim 1, wherein the curved structures have the shape of segments of convex gutters, with convex parts at the light receiving side and concave parts at the exit side.

11. The light collector device according to claim 1, wherein two or more subsets of the total number of curved structures comprise two or more dyes, respectively.

12. The light collector device according to claim 1, comprising first curved structures and second curved structures, the first curved structures enclosing the second curved structures, wherein the dye in the waveguide material of the first curved structures differs from the dye in the waveguide material of the second curved structures.

13. A solar device comprising the light collector device according to claim 1 and a solar cell, wherein the solar cell is configured to receive light escaping from the light exit edge part.

14. A greenhouse comprising the light collector device according to claim 1, wherein the collector device is configured to provide light via the light exit edge parts into the greenhouse.

15. A lighting unit, comprising the light collector device according to claim 1, a plurality of light sources, and optionally a diffuser plate, wherein the light sources are configured to provide light source light to the light receiving side, and wherein the optional diffuser plate is configured between the plurality of light source and the light collector device.