RED EMITTING PHOSPHOR FOR PLASMA DISPLAY PANELS AND GAS DISCHARGE LAMPS

摘要

The invention provides a lighting unit (100) comprising (1) a vacuum ultraviolet (VUV) radiation based source of radiation (10) configured to generate VUV radiation (11), and (2) a luminescent material (20) configured to convert at least part of the VUV radiation into visible luminescent material light (21), wherein the luminescent material comprises a trivalent praseodymium containing material selected from the group consisting of (Zr1-x-yHfxPry)(Si1-yPy)04, (Zetar1-x-yHfxPry)3((Rho1-3/4yS3/4y)04)4, and (Zr1-x-yHfxPry)3 ((B1-3/4yS3/4y))O3)4, with x in the range of 0.0-1.0 and y being larger than 0 and being equal to or smaller than 0.15.