Coating composition, its preparation and use in reducing heat gain

A coating composition for reducing heat gain of an article, comprising:

• TiO2 particles;
• hollow glass microspheres;
• phosphor material particles having a quantum yield of at least about 90% and an excitation wavelength range from about 250 nm to about 440 nm, said excitation wavelength range matching that of the TiO2 particles, thereby enhancing heat gain reduction of the coating composition;
• and
• a polymer matrix;
• wherein the TiO2 particles have a weight percentage of about 10% wt to about 30% wt with respect to the coating composition;
• and the phosphor material particles are BaMgAl10O17:Eu2+, having a weight percentage of about 4% wt to about 8% wt with respect to the coating composition;
• wherein the TiO2 particles and the phosphor material particles are sized and formulated relative to each other such that the TiO2 particles adhere to and assemble into a dielectric shell around the phosphor material particles, the coated phosphor material particles having a Purcell factor of about 2.6.