Patent ID: 6720026
Filing Date: 2004-04-13
Classification: C23C,H01J

Abstract:
A method for forming fluorescent layers on a substrate, comprising the steps of:vapor depositing a needle-shaped fluorescent layer having needle structures with voids therebetween, composed of fluorescent material, by producing a vapor jet of said fluorescent material onto a substrate in a vapor-deposition apparatus; cooling said vapor jet before said vapor jet strikes said substrate by flowing cool inert gas through said vapor-deposition apparatus during the vapor depositing; and controlling vapor deposition of said fluorescent layer so that said fluorescent layer is deposited on said substrate with lattice imperfections therein, giving said fluorescent it layer a density which is reduced, due to said voids and lattice imperfections, in comparison to a density which said fluorescent material has as a solid, to produce a needle-shaped fluorescent layer with optical separation between needle structures.