Patent ID: 7057335
Filing Date: 2006-06-06
Classification: C23C,H01J

Abstract:
1. In a plasma lamp comprising a light emitting chamber having a wall formed from a material selected from the group consisting of vitreous material and ceramic and a multilayer coating on at least a portion of the inner surface of said wall, said coating having an exposed surface with a shape substantially conforming to the shape of said inner surface portion wherein said coating comprises a nitride layer of boron, scandium, yttrium, lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, or lutetium exposed to the light emitting plasma, the improvement wherein the coating comprises a nitride layer adjacent said inner surface.