A method of making a solid filter material which filters a predetermined wavelength band from a broader spectrum of radiation includes creating a colloidal structure composed of particles dispersed within a medium, and introducing a solvent thereto. Thereafter, the solvent is evaporated and the remaining...http://www.google.fr/patents/US5281370?utm_source=gb-gplus-shareBrevet US5281370 - Method of making solid crystalline narrow band radiation filter
Method of making solid crystalline narrow band radiation filter
