| 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. |
| 主权项 |
1. A luminescent material comprising:
a plurality of particles of an UV-luminescent material, the UV-luminescent material having a core of the UV-luminescent material, and a coating,
wherein the coating comprises a first coating layer and a second coating layer,wherein the first coating layer is between the core and the second coating layer,wherein the second coating layer comprises one or more alkaline earth oxides selected from the group consisting of: (Mg,Ca)O, (Ca,Sr)3Al2O6, (Mg,Ca,Sr)Al2O4, (Ca,Sr)4Al14O25, (Ca,Sr)Al4O7, (Ca,Sr)Al12O19, LaMgAl11O19, (Ba,Sr)MgAl10O17, and (Ba,Sr)Mg3Al14O25, andwherein the second coating layer has extending structures. |
