IP Library › Granted Patent US 12,247,126
Granted Patent B2
US 12,247,126 · App. 17/053,493 · Granted Mar 11, 2025

Near-infrared harvesting transparent luminescent solar concentrators with engineered stokes shift

Inventors: Richard R. Lunt, III (Williamston, MI); Babak Borhan (Okemos, MI); Benjamin G. Levine (East Lansing, MI); Wei Sheng (Ann Arbor, MI); Jun Zhang (San Luis Obispo, CA); Chenchen Yang (Holt, MI)
Assignee: Board of Trustees of Michigan State University
C09B23/0041C09B23/0025C09B23/0033C09B23/0066C09K11/06H01L31/055C09K2211/1022
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Quick Facts
Patent No.
US 12,247,126
App. No.
17/053,493
Granted
Mar 11, 2025
Kind
B2
Abstract

A luminescent solar concentrator (LSC) device is provided. The LSC device has an active layer including a modified luminophore having a polymethine component including a plurality of methine groups (═CH—) n , where n is an odd integer greater than 1. A hydrogen atom (H) of one of the plurality of methine groups is replaced by one of -AR 1 R 2 or -DR 3 , where A is selected from nitrogen (N), phosphorus (P), arsenic (As) and antimony (Sb) and D is selected from oxygen (O), sulfur (S), selenium (Se), and tellurium (Te), R 1 and R 2 are independently selected from H, aliphatic groups, and aromatic groups bound to A through a carbon atom, or R 1 and R 2 together form an alicyclic ring containing A, and R 3 is selected from H, aliphatic groups, aromatic groups, and alicyclic groups bound to D through a carbon atom.

Claims (55)

1. A luminescent solar concentrator device comprising:

a waveguide including,

a luminophore in an active region of the waveguide, having a polymethine component, the polymethine component comprising a plurality of methine groups (═CH—)

where n is an odd integer greater than 1 and a hydrogen atom (H) of one of the plurality of methine groups is replaced by one of

where:

A is selected from nitrogen (N), phosphorus (P), arsenic (As) and antimony (Sb) and D is selected from oxygen (O), sulfur(S), selenium (Se), and tellurium (Te),

R 1 and R 2 are independently selected from H, aromatic groups, aliphatic groups bound to A through a carbon atom, or R 1 and R 2 together form an alicyclic ring containing A, and

R 3 is selected from H, aliphatic groups, aromatic groups, and alicyclic groups bound to D through a carbon atom,

wherein the luminophore has an overlap integral (OI) of less than or equal to about 20, and an absolute absorption of greater than or equal to about 50% in absorption spectra, wherein the OI is defined by formula (2):

OI

=

∫

0

∞

A

⁡

(

λ

)

·

PL

*

(

λ

)

⁢

d

⁢

λ

,

(

2

)

where A(λ) is a single-path absolute absorption spectrum of a composite film comprising a luminophore and a host material, and PL*(λ) is a normalized emission spectrum of the luminophore in the host material,

wherein the active region of the waveguide includes a front surface and a back surface, the front surface and the back surface being outermost surfaces of the luminescent solar concentrator device, and

wherein the luminescent solar concentrator device is visibly transparent and has a quantum yield of greater than or equal to about 20%.

2. The luminescent solar concentrator device according to claim 1 , wherein:

R 1 and R 2 are individually selected from H, substituted or unsubstituted C 1 -C 20 alkyl, substituted or unsubstituted C 1 -C 20 alkenyl, substituted or unsubstituted C 1 -C 20 acyl, substituted or unsubstituted C 1 -C 20 ether or polyether, substituted or unsubstituted C 1 -C 20 hydroxyalkyl, or substituted or unsubstituted C 1 -C 20 aminoalkyl, or

R 1 and R 2 together form a substituted or unsubstituted C 1 -C 20 cycloalkyl, or substituted or unsubstituted C 1 -C 20 heteroalkyl.

3. The luminescent solar concentrator device according to claim 2 , wherein the A is nitrogen (N).

4. The luminescent solar concentrator device according to claim 1 , wherein R 3 is selected from H, substituted or unsubstituted C 1 -C 20 alkyl, substituted or unsubstituted C 1 -C 20 alkenyl, substituted or unsubstituted C 1 -C 20 acyl, substituted or unsubstituted C 1 -C 20 ether or polyether, substituted or unsubstituted C 1 -C 20 hydroxyalkyl, or substituted or unsubstituted C 1 -C 20 aminoalkyl.

5. The luminescent solar concentrator device according to claim 4 , wherein the D is oxygen (O).

6. The luminescent solar concentrator device according to claim 1 , wherein a central methine group is the one of the plurality of methine groups having the hydrogen atom (H) replaced by the

7. The luminescent solar concentrator device according to claim 1 , wherein the luminophore has an OI of less than or equal to about 3.4.

8. The luminescent solar concentrator device according to claim 1 , wherein the luminophore has a Stokes shift of greater than or equal to about 50-75 nm to less than or equal to about 225 nm.

9. The luminescent solar concentrator device according to claim 1 , wherein the luminophore has a strongest absorbance maximum of light at a wavelength of greater than or equal to about 400 nm.

10. The luminescent solar concentrator device according to claim 1 , wherein the luminophore has a strongest peak absorbance of light at a wavelength of greater than or equal to about 650 nm.

11. The luminescent solar concentrator device according to claim 1 , wherein the luminophore has a strongest peak absorbance of light at a wavelength of less than or equal to about 450 nm.

12. The luminescent solar concentrator device according to claim 1 , wherein the luminophore has a strongest peak emission of light at a wavelength of greater than or equal to about 650 nm.

13. The luminescent solar concentrator device according to claim 1 , wherein the luminophore has a strongest peak absorbance of light at a wavelength of greater than or equal to about 650 nm and a strongest peak emission of light at a wavelength of greater than or equal to about 650 nm.

14. The luminescent solar concentrator device according to claim 1 , wherein the luminescent solar concentrator device has an average visible transmittance of greater than or equal to about 80% 75%.

15. The luminescent solar concentrator device according to claim 1 , wherein the luminescent solar concentrator device has an external quantum efficiency of greater than or equal to about 7%.

16. The luminescent solar concentrator device according to claim 1 , wherein the luminescent solar concentrator device has an average visible transmittance of greater than or equal to about 90%.

17. The luminescent solar concentrator device according to claim 1 , wherein the luminophore also has a Stokes shift of greater than or equal to about 50 nm to less than or equal to about 250 nm.

18. The luminescent solar concentrator device according to claim 1 , wherein the organic luminophore is fluorescent.

Assignments (2)
CONFIRMATORY LICENSE Recorded May 23, 2025
From: MICHIGAN STATE UNIVERSITY
To: NATIONAL SCIENCE FOUNDATION
Reel/Frame 071342/0865 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Mar 16, 2022
From: LUNT, RICHARD R., III; BORHAN, BABAK; LEVINE, BENJAMIN G.; SHENG, WEI; ZHANG, JUN; YANG, CHENCHEN
To: BOARD OF TRUSTEES OF MICHIGAN STATE UNIVERSITY
Reel/Frame 059281/0692 →
Continuity (2)
Provisional Application 62669184 · May 9, 2018
Related Publication 20210230427A1 · Jul 29, 2021
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