Patent ID: 8168447

Claim:
A nanoparticle comprising at least two inorganic luminophores each with different emission wavelengths, wherein a specific molar ratio of the luminophores is encapsulated in a silica matrix, wherein the specific molar ratio of luminophores controls intensity of the emission wavelengths generated from the silica matrix when exposed to a single wavelength excitation, wherein the luminophores are Tris(2,2′-bipyridyl)osmium(II) bis(hexafluorophosphate) (OsBpy) and Tris(2,2′-bipyridyl)dichlororuthenium(II) hexahydrate (RuBpy) and wherein the molar ratio of luminophores is selected from the group consisting of: 9:1, 7:1, 5:1, 2:1, 1:5, 1:8, 1:17, and 1:27.