Surface modified conversion light emitting substance

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Surface modified phosphor particles (I) comprise luminescent particles containing a calcium-strontium-barium-silicon-oxide compound (a) and/or another silicates, where : the luminescent compounds exclude one or more activator ions of cerium, europium or manganese, and/or codopant based on iron, copper and/or zinc; and at least one of metal-, transition metal- or semi-metal oxide layer, and organic coating are applied on the luminescent particles. Surface modified phosphor particles (I) comprise luminescent particles containing a calcium-strontium-barium-silicon-oxide compound of formula ((Ca, Sr, Ba) 2SiO 4) (a) and/or another silicates, where : the luminescent compounds exclude one or more activator ions of cerium, europium or manganese, and/or codopant based on iron, copper and/or zinc; and at least one of metal-, transition metal- or semi-metal oxide layer and organic coating are applied on the luminescent particles. Independent claims are included for : (1) preparation of (I), comprising mixing at least two educts and at least one dopant, and thermally treating the mixture at greater than 150[deg] C, coating the phosphor particles with the metal-, transition metal- or semi-metal oxide layer according to wet-chemical method or upstream method, and applying the organic coating; and (2) an illumination unit comprising at least one primary source of light, whose emission is maximum 250-530 nm, preferably 380-500 nm, where the radiation is partially or completely converted into longer-wave radiation by (I).