Patent ID: 8314325

Claim:
A luminescent solar collector comprising a sheet and a light energy converter operatively connected to the sheet; the sheet comprising a thermoplastic polymer and dispersed therein at least two dyes A and B; wherein dye A is a fluorescent dye of Formula (I) and dye B is either a perylene dye of Formula (II) or a diketopyrrolopyrrole dye of Formula (III): wherein R 1 , R 2 , and R 3 are independently selected from C 6 -C 18 alkyl, substituted C 6 -C 18 alkyl, C 6 -C 20 aryl, and substituted C 6 -C 20 aryl; each R is independently selected from C 1 -C 18 alkyl, substituted C 1 -C 18 alkyl, C 1 -C 18 alkoxy, substituted C 1 -C 18 alkoxy, and halogen; m represents the number of R substitutents on each phenoxy ring, and each m is independently an integer from 0 to 5; each R 4 is independently selected from halogen, cyano, carbamoyl, C 1 -C 6 alkyl, substituted C 1 -C 6 alkyl, C 1 -C 6 alkoxy, and C 2 -C 6 alkoxycarbonyl; k represents the number of R 4 substitutents on each phenyl ring, and each k is independently an integer from 0 to 5; wherein the two dyes A and B each absorb light and radiate the absorbed light at a longer wavelength, and the sheet is configured to transmit the radiated light to the light energy converter; wherein the two dyes A and B together comprise from 0.001 to 1 weight percent of the sheet, and the weight ratio of dye A to dye B is from about 1 to about 5; and wherein dye A has a maximum absorption wavelength of from 520 nm to 600 nm, and dye B has a maximum absorption wavelength of from 400 nm to 540 nm.