LIGHT-EMITTING DEVICE USING LUMINESCENT SUBSTANCES WITH OXYORTHOSILICATE LUMINOPHORES

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FIELD : physics, optics. SUBSTANCE : light-emitting device includes a light-emitting diode and luminescent substances placed around the light-emitting diode to absorb at least part of the light emitted by the light-emitting diode and emit light having a different wavelength from that of the absorbed light. The luminescent substances contain Eu2+-doped silicate luminophores in which solid solutions in the form of mixed phases between alkali-earth metal oxyorthosilicates and rare-earth metal oxyorthosilicates are used as base lattices for the Eu2+ activation leading to luminescence. The luminescent substances are used as radiation converters to convert higher-energy primary radiation, for example, ultraviolet (UV) radiation or blue light, into longer-wave visible radiation and are therefore preferably used in corresponding light-emitting devices. EFFECT : invention prolongs the useful life of the device. 20 cl, 3 tbl, 7 dwg