A luminescent component, comprising a first film comprising a first solid polymer composition, wherein the first solid polymer composition comprises first luminescent crystals, wherein the first luminescent crystals - are of the perovskite structure, - are selected from compounds of formula: M 1 a M 2 b X c, wherein M 1 represents Cs, optionally doped with up to 30 mol% of one or more other metals having coordination number 12, M 2 represents Pb, optionally doped with up to 30 mol% of one or more other metals having coordination number 6, X independently represents anions selected from the group consisting of Cl, Br, I, cyanide, and thiocyanate, a represents 1, b represents 1, c represents 3; - are of size between 3 nm and 3000 nm, - emit red light in response to excitation by light with a shorter wavelength, a second film comprising a second solid polymer composition, wherein the second solid polymer composition comprises second luminescent crystals, wherein the second luminescent crystals - are of the perovskite structure - are selected from compounds of formula: M 1 a M 2 b X c, wherein M 1 represents Cs, optionally doped with up to 30 mol% of one or more other metals having coordination number 12, M 2 represents Pb, optionally doped with up to 30 mol% of one or more other metals having coordination number 6, X independently represents anions selected from the group consisting of Cl, Br, and I, cyanide, and thiocyanate, a represents 1, b represents 1, c represents 3; - are of size between 3 nm and 3000 nm, - emit green light in response to excitation by light with a shorter wavelength, and one or more barrier films each having a water vapor transmission rate of less than 0.2 g mm m -2 day -1. - are of the perovskite structure, - are selected from compounds of formula: M 1 a M 2 b X c, wherein M 1 represents Cs, optionally doped with up to 30 mol% of one or more other metals having coordination number 12, M 2 represents Pb, optionally doped with up to 30 mol% of one or more other metals having coordination number 6, X independently represents anions selected from the group consisting of Cl, Br, I, cyanide, and thiocyanate, a represents 1, b represents 1, c represents 3; M 1 represents Cs, optionally doped with up to 30 mol% of one or more other metals having coordination number 12, M 2 represents Pb, optionally doped with up to 30 mol% of one or more other metals having coordination number 6, X independently represents anions selected from the group consisting of Cl, Br, I, cyanide, and thiocyanate, a represents 1, b represents 1, c represents 3; - are of size between 3 nm and 3000 nm, - emit red light in response to excitation by light with a shorter wavelength, - are of the perovskite structure - are selected from compounds of formula: M 1 a M 2 b X c, wherein M 1 represents Cs, optionally doped with up to 30 mol% of one or more other metals having coordination number 12, M 2 represents Pb, optionally doped with up to 30 mol% of one or more other metals having coordination number 6, X independently represents anions selected from the group consisting of Cl, Br, and I, cyanide, and thiocyanate, a represents 1, b represents 1, c represents 3; M 1 represents Cs, optionally doped with up to 30 mol% of one or more other metals having coordination number 12, M 2 represents Pb, optionally doped with up to 30 mol% of one or more other metals having coordination number 6, X independently represents anions selected from the group consisting of Cl, Br, and I, cyanide, and thiocyanate, a represents 1, b represents 1, c represents 3; - are of size between 3 nm and 3000 nm, - emit green light in response to excitation by light with a shorter wavelength, and