| abstract |
The present invention relates to compounds of formula I, MIMII 3MIII 3 MIV 3 N2O12:Eu I wherein, MI, MII, MII, and MIV have one of the meanings as given in claim 1, to a process of their preparation, the use of these compounds as conversion phosphors or in an emission-converting material, the use of these phosphors in electronic and electro optical devices, such as light emitting diodes (LEDs) and solar cells, and especially, to illumination units comprising at least one of these phosphors. |