Inorganic Films from Three Different Phosphors via a Liquid Coating Route from Inverse Miniemulsions

Precursor nanoparticles of complex lanthanide phosphors with binary and ternary composition are made using the inverse miniemulsion process. These particles show a high colloidal and compositional stability and are used to obtain inorganic crystalline films which can be very thin and highly homogeneous in topography and structure. In a subsequent annealing process, the precursor materials are converted to films of red, green, or blue phosphor. In the case of red phosphor, "single-crystal films" are formed which show a surface roughness of the order of single crystalline surfaces.