Polymer sheet

A polymer sheet composition comprising at least two coextruded polymer layers, wherein at least one of the coextruded polymer layers comprises a luminescence downshifting compound for at least partially absorbing radiation having a certain wavelength and re-emitting radiation at a longer wavelength than the wavelength of the absorbed radiation, and

• wherein at least one of the coextruded polymer layers comprises
• (i) a polymethylmethacrylate or an alkylmethacrylate, and/or
• (ii) an alkylacrylate copolymer, functionalized polyolefins, ionomers;
• or mixtures thereof

A method for making a polymer sheet, comprising the steps of:

• (i) providing one or more master batch polymer materials for each polymer layer, and
• (ii) co-extruding the master batch polymer materials to layers forming the polymer sheet;
• wherein at least one of the layers comprises a luminescence downshifting compound for at least partially absorbing radiation having a certain wavelength and re-emitting radiation at a longer wavelength than the wavelength of the absorbed radiation, and
• wherein at least one of the polymer layers comprises (i) a polymethylmethacrylate or an alkylmethacrylate, and/or (ii) an alkylacrylate copolymer, functionalized polyolefins, or mixtures thereof.