Abstract: The present invention relates to a light emitting device comprising a light source and a luminescent material, which luminescent material comprises one or more matrix materials and two pluralities of nanoparticles, which two pluralities of nanoparticles comprise different perovskite compounds. The invention also relates to a luminescent material.

Abstract: The present invention relates to a light emitting device comprising a light source and a luminescent material, which luminescent material comprises: one or more matrix materials, and, disposed in said one or more matrix materials, a first plurality of nanoparticles comprising a first crystalline compound and a second plurality of nanoparticles comprising a second crystalline compound, which first crystalline compound and second crystalline compounds are different compounds of formula [A]a[M]b[X]c, wherein: [A] is at least one cation; [M] is at least one metal or metalloid cation; [X] is at least one anion; a is an integer from 1 to 6; b is an integer from 1 to 6; and c is an integer from 1 to 18. The invention also relates to the use of said luminescent material as a phosphor in a light emitting device.