IP Library › Granted Patent US 12,336,322
Granted Patent B2
US 12,336,322 · App. 17/277,807 · Granted Jun 17, 2025

Transparent luminescent solar concentrator

Inventors: Richard R. Lunt, III (Williamston, MI); Chenchen Yang (Holt, MI)
Assignee: Board of Trustees of Michigan State University
H10F77/484H10F77/45H10F77/488Y02E10/52
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Quick Facts
Patent No.
US 12,336,322
App. No.
17/277,807
Granted
Jun 17, 2025
Kind
B2
Abstract

A solar concentrator device is provided. The solar concentrator device includes a waveguide having a luminophore and a first refractive index; a photovoltaic component operably coupled to the waveguide; and a film disposed onto a surface of the waveguide, the film having a second refractive index. The second refractive index of the film is lower than the first refractive index of the waveguide. The waveguide and the film are visibly transparent.

Claims (55)

1. A solar concentrator device comprising:

a waveguide comprising a luminophore and having a first refractive index, the luminophore being distributed across the waveguide;

a photovoltaic component operably coupled to, and in direct contact with, the waveguide; and

a film disposed onto a surface of the waveguide and configured to be disposed onto a substrate, wherein the film is smooth and has a second refractive index that is lower than the first refractive index of the waveguide, and the film extends uninterrupted across the entire surface of the waveguide,

wherein the waveguide and the film are visibly transparent, and

wherein the film comprises poly(1,1,1,3,3,3-hexafluoroisopropyl acrylate), poly(2,2,3,3,4,4,4-heptafluorobutyl acrylate), poly(2,2,3,3,4,4,4-heptafluorobutyl methacrylate), poly(2,2,3,3,3-pentafluoropropyl acrylate), poly(1,1,1,3,3,3-hexafluoroisopropy! methacrylate), poly(2,2,3,4,4,4-hexafluorobutyl acrylate), poly(2,2,3,4,4,4-hexafluorobutyl methacrylate), poly(2,2,3,3,3-pentafluoropropyl methacrylate), poly(2,2,2-trifluoroethyl acrylate), poly(2,2,3,3-tetrafluoropropyl acrylate), poly(2,2,3,3-tetrafluoropropyl methacrylate), poly(2,2,2-trifluoroethyl methacrylate), or a combination thereof.

2. The solar concentrator device according to claim 1 , wherein the solar concentrator device has a color rendering index of greater than or equal to about 80.

3. The solar concentrator device according to claim 1 , wherein the second refractive index is greater than or equal to about 1.05 to less than or equal to about 1.45.

4. The solar concentrator device according to claim 1 , wherein the second refractive index is lower than the first refractive index by greater than or equal to about 0.1.

5. The solar concentrator device according to claim 1 , wherein the first refractive index is greater than or equal to about 1.45 to less than or equal to about 2.5.

6. The solar concentrator device according to claim 1 , wherein the solar concentrator device is flexible.

7. The solar concentrator device according to claim 1 , wherein the photovoltaic component is either:

a photovoltaic array that is either disposed onto a surface of the waveguide or embedded within the waveguide, or

a photovoltaic cell dispose on at least one edge of the waveguide.

8. The solar concentrator device according to claim 1 , wherein the luminophore is either embedded within the waveguide or disposed onto a surface of the waveguide as a layer.

9. The solar concentrator device according to claim 1 , wherein the film has a tensile strength of greater than or equal to about 0.05 MPa.

10. The solar concentrator device according to claim 1 , wherein the film has a Young's modulus of less than or equal to about 10 MPa.

11. The solar concentrator device according to claim 1 , wherein the film has a Shore hardness of greater than or equal to about 40 D or a pencil hardness of greater than or equal to about 1H.

12. The solar concentrator device according to claim 1 , wherein the film has a thickness of greater than or equal to about 0.1 μm to less than or equal to about 1 mm.

13. The solar concentrator device according to claim 1 , wherein the film is an adhesive.

14. The solar concentrator device according to claim 1 , wherein the film has an adhesive surface opposite to a surface of the film that is disposed onto the surface of the waveguide.

15. The solar concentrator device according to claim 14 , further comprising:

a sheet disposed onto the adhesive surface, wherein the sheet is configured to be peeled off of the solar concentrator device to expose the adhesive surface of the film.

16. The solar concentrator device according to claim 1 , wherein the solar concentrator device is disposed onto a substrate with the film located between the substrate and the waveguide.

17. The solar concentrator device according to claim 16 , wherein color coordinates of the substrate with the solar concentrator device are within about 50% of the color coordinates of the substrate alone.

18. The solar concentrator device according to claim 16 , wherein the substrate is a surface of a vehicle, a billboard, a surface of a building, a mobile electronic device, or a surface of a greenhouse.

19. The solar concentrator device according to claim 18 , wherein the substrate is the surface of the vehicle, the surface of the vehicle being curved.

20. The solar concentrator device according to claim 19 , further comprising:

a top coat disposed onto an exposed surface of the waveguide, wherein the top coat is transparent to visible and infrared light.

21. The solar concentrator device according to claim 1 , further comprising:

an adhesive layer disposed onto the film, wherein the film is located between the adhesive layer and the waveguide.

22. The solar concentrator device according to claim 1 , wherein the waveguide has a refractive index of greater than or equal to about 1.45 to less than or equal to about 2.5.

23. The solar concentrator device according to claim 1 , further comprising:

a second solar concentrator device disposed onto the solar concentrator device, the second solar concentrator device comprising a second waveguide comprising a second luminophore, a second photovoltaic component operably coupled to the second waveguide, and a second film having a refractive index of greater than or equal to about 1.05 to less than or equal to about 1.45, the second waveguide, the second photovoltaic component, and the second film both being visibly transparent,

wherein the second film is positioned between the solar concentrator device and the second solar concentrator device.

24. The solar concentrator device according to claim 1 , further comprising:

a stack comprising a plurality of additional solar concentrator devices disposed onto the solar concentrator device on a surface opposite to the film,

wherein each of the plurality of additional solar concentrator devices comprises an additional waveguide comprising an additional luminophore, an additional photovoltaic component operably coupled to the additional waveguide, and an additional film having a refractive index of greater than or equal to about 1.05 to less than or equal to about 1.45, each of the additional waveguide, the additional photovoltaic component, and the additional film being visibly transparent, and

wherein no additional film is directly disposed onto another additional film.

25. The solar concentrator device according to claim 24 , wherein the plurality of additional solar concentrator devices of the stack includes greater than or equal to 2 additional solar concentrator devices to less than or equal to 10 additional solar concentrator devices.

26. A solar concentrator device comprising:

a visibly transparent luminescent solar concentrator (TLSC) comprising a waveguide having a first refractive index, the waveguide having a first surface configured to directly receive light and a second surface opposite the first surface; and

a visibly transparent film disposed onto the second surface of the TLSC, the visibly transparent film being an adhesive and having an adhesive surface that is not disposed onto the surface of the TLSC and having a second refractive index, the visibly transparent film continuous across an entire surface of the waveguide,

wherein the second refractive index is lower than the first refractive index,

wherein the solar concentrator device is configured to be integrated onto a substrate by way of the adhesive surface of the visibly transparent film, and wherein the visibly transparent film comprises poly(1,1,1,3,3,3-hexafluoroisopropyl acrylate), poly(2,2,3,3,4,4,4-heptafluorobutyl acrylate), poly(2,2,3,3,4,4,4-heptafluorobutyl methacrylate), poly(2,2,3,3,3-pentafluoropropyl acrylate), poly(1,1,1,3,3,3-hexafluoroisopropyl methacrylate), poly(2,2,3,4,4,4-hexafluorobutyl acrylate), poly(2,2,3,4,4,4-hexafluorobutyl methacrylate), poly(2,2,3,3,3-pentafluoropropyl methacrylate), poly(2,2,2-trifluoroethyl acrylate), poly(2,2,3,3-tetrafluoropropyl acrylate), poly(2,2,3,3-tetrafluoropropyl methacrylate), poly(2,2,2-trifluoroethyl methacrylate), or a combination thereof.

27. The solar concentrator device according to claim 26 , wherein the TLSC comprises luminophores that have a maximum peak absorbance in the UV, NIR, or IR and a maximum peak emission in the NIR or IR.

28. The solar concentrator device according to claim 26 , wherein the TLSC comprises a photovoltaic cell or a photovoltaic array.

29. A method of fabricating a solar concentrator device, the method comprising:

obtaining a solar concentrator comprising a waveguide comprising a luminophore and having a first refractive index, and a photovoltaic component operably coupled to the waveguide, the waveguide having a first surface and a second surface opposite the first surface, the first surface configured to directly receive light; and

disposing a film onto the second surface of the solar concentrator, wherein the film has a second refractive index that is lower than the first refractive index of the waveguide, and the film is an adhesive having an adhesive surface, the film being continuous across an entire surface of the waveguide, the film comprising poly(1,1,1,3,3,3-hexafluoroisopropyl acrylate), poly(2,2,3,3,4,4,4-heptafluorobutyl acrylate), poly(2,2,3,3,4,4,4-heptafluorobutyl methacrylate), poly(2,2,3,3,3-pentafluoropropyl acrylate), poly(1,1,1,3,3,3-hexafluoroisopropyl methacrylate), poly(2,2,3,4,4,4-hexafluorobutyl acrylate), poly(2,2,3,4,4,4-hexafluorobutyl methacrylate), poly(2,2,3,3,3-pentafluoropropyl methacrylate), poly(2,2,2-trifluoroethyl acrylate), poly(2,2,3,3-tetrafluoropropyl acrylate), poly(2,2,3,3-tetrafluoropropyl methacrylate), poly(2,2,2-trifluoroethyl methacrylate), or a combination thereof,

wherein the waveguide and the film are visibly transparent, and

wherein the solar concentrator is configured to be integrated onto a substrate by way of the adhesive surface.

30. The method according to claim 29 , wherein the disposing the film onto the surface of the solar concentrator comprises depositing the film onto the surface of the solar concentrator by glancing angle deposition or solution deposition.

31. The solar concentrator device according to claim 1 , wherein the entire solar concentrator device is visibly transparent and has an average visible transmittance of greater than about 50%.

32. The solar concentrator device according to claim 1 , wherein the entire solar concentrator device is visibly transparent and has an average visible transmittance of greater than about 75%.

Assignments (2)
CONFIRMATORY LICENSE Recorded Dec 28, 2023
From: MICHIGAN STATE UNIVERSITY
To: NATIONAL SCIENCE FOUNDATION
Reel/Frame 066141/0703 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Nov 1, 2021
From: LUNT, RICHARD R.; YANG, CHENCHEN
To: BOARD OF TRUSTEES OF MICHIGAN STATE UNIVERSITY
Reel/Frame 057983/0532 →
Continuity (2)
Provisional Application 62735433 · Sep 24, 2018
Related Publication 20210351312A1 · Nov 11, 2021
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