ERDALKALIMETALLSILIKAT-LEUCHTSTOFFE UND VERFAHREN ZUR VERBESSERUNG IHRER LANGZEITSTABILITÄT
    4.
    发明公开
    ERDALKALIMETALLSILIKAT-LEUCHTSTOFFE UND VERFAHREN ZUR VERBESSERUNG IHRER LANGZEITSTABILITÄT 有权
    碱土金属-LIGHT物质和一种用于改善您的长期稳定性

    公开(公告)号:EP2396385A1

    公开(公告)日:2011-12-21

    申请号:EP10773598.7

    申请日:2010-10-14

    IPC分类号: C09K11/02 C09K11/77

    摘要: The present invention relates to alkaline earth metal silicate luminophores having improved long-term stability and to a corresponding method for improving the long-term stability of alkaline earth metal silicate luminophores. The luminophore according to the invention is a luminophore comprising a base lattice according to the general chemical formula EA
    x Si
    y O
    z , where x, y, z > 0. The component EA is formed by one or more alkaline earth metals. An activator, for example Eu
    2+ or Mn
    2+ , is doped into the base lattice. The luminophore has the fundamental property to absorb radiation in a first wavelength range and emit radiation in a second wavelength range that is different from the first wavelength range. The luminophore is designed in the form of crystals. According to the invention, the surfaces of the crystals of the luminophore are chemically modified such that at least portions of the surfaces thereof are formed by a chemical compound of the general formula Ea
    u Z
    2 . The component Z is formed by anions, which can be chemically combined with the EA cations of the luminophore. The variable u is equal to an ion charge of the anions Z. The chemical modification is therefore not a coating.