US 12,247,126 B2
Near-infrared harvesting transparent luminescent solar concentrators with engineered stokes shift
Richard R. Lunt, III, Williamston, MI (US); Babak Borhan, Okemos, MI (US); Benjamin G. Levine, East Lansing, MI (US); Wei Sheng, Ann Arbor, MI (US); Jun Zhang, San Luis Obispo, CA (US); and Chenchen Yang, Holt, MI (US)
Assigned to Board of Trustees of Michigan State University, East Lansing, MI (US)
Appl. No. 17/053,493
Filed by Board of Trustees of Michigan State University, East Lansing, MI (US)
PCT Filed May 8, 2019, PCT No. PCT/US2019/031371
§ 371(c)(1), (2) Date Nov. 6, 2020,
PCT Pub. No. WO2019/217583, PCT Pub. Date Nov. 14, 2019.
Claims priority of provisional application 62/669,184, filed on May 9, 2018.
Prior Publication US 2021/0230427 A1, Jul. 29, 2021
Int. Cl. C09B 23/01 (2006.01); C09K 11/06 (2006.01); H01L 31/055 (2014.01)
CPC C09B 23/0041 (2013.01) [C09B 23/0025 (2013.01); C09B 23/0033 (2013.01); C09B 23/0066 (2013.01); C09K 11/06 (2013.01); H01L 31/055 (2013.01); C09K 2211/1022 (2013.01)] 18 Claims
OG exemplary drawing
 
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—)

OG Complex Work Unit Chemistry
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

OG Complex Work Unit Chemistry
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),
R1 and R2 are independently selected from H, aromatic groups, aliphatic groups bound to A through a carbon atom, or R1 and R2 together form an alicyclic ring containing A, and
R3 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):

OG Complex Work Unit Math
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%.