Phosphor Screen Precipitation Process
Original Publication Date: 1981-Feb-01
Included in the Prior Art Database: 2005-Feb-10
Phosphor screens, which convert electron beams or short-wavelength lig into visible light, should be made not much thicker than the wavelength of the emitting light in order to improve image definition and efficiency by avoiding scattered light and self-absorption. Based on such criterion a thickness of 1 micrometer is generally more than sufficient since the penetration depth of the exciting radiation ~electrons or photons) is generally an order of magnitude smaller. A micro-precipitate of the phosphor is produced by dissolving to near saturation in a solvent and quickly diluting this solution with a second liquid, which is miscible with the solvent but does not dissolve the phosphor.