LUMINESCENT MATERIAL PARTICLES COMPRISING A COATING AND LIGHTING UNIT COMPRISING SUCH LUMINESCENT MATERIAL

摘要

The invention provides a a luminescent material comprising particles of UV- luminescent material having a coating, wherein the coating (a " multi-layer coating") comprises a first coating layer and a second coating layer, wherein the first coating layer is between the luminescent material and the second coating layer, and wherein in a specific embodiment the second coating layer comprises an alkaline earth oxide, especially MgO. Further, the invention provides a lighting unit comprising such luminescent material.