Patent ID: 6982117

Claim:
A composition comprising a polymer matrix component that is substantially non-absorbing in the visible region of the electromagnetic spectrum and having dispersed therein: (A) particle scattering colorant particles; and (B) at least one luminescent substance; wherein said particle scattering colorant particles: (1) are selected from the group consisting of a semiconductor, metallic conductor, metal oxide or metal salt; (2) have an average diameter in the smallest dimension of less than about 0.1 micron; (3) have a minimum in the transmitted light intensity ratio in the 380 to 750 nanometer range that is shifted at least by 10 nanometers compared with that obtained for the same semiconductor, metallic conductor, metal oxide or metal salt having an average particle size above about 20 microns; and wherein said luminescent substance further comprises at least one fluorescent substance, at least one phosphorescent substance or at least one fluorescent and at least one phosphorescent substance.