| 摘要 |
Disclosed is the use of Sc2+ based active crystalline luminescent media for laser systems, tunable in the UV-visible spectral range. The crystalline media are Sc-doped alkali-earth-halide crystals such as: (1) alkali-earth-halide combinations, such as MeF2, MeCl2,crystals; (2) mixed alkali-earth metal fluorides and chlorides, such as MeFCl, MxMe1-xF2 and MxMe1-xCl2 crystals; and (3) complex fluoride crystals; wherein M and Me are Ca, Sr, Ba or Mg. These crystals have Sc2+ ion impurities providing stable optical centers that yield advantageous luminescent properties. The base crystal structure utilized determines the luminescent emission spectrum for the Sc2+ optical centers. By manipulating the base crystal, the maxima of the absorption and emission bands may be altered from UV-blue to red in the optical spectrum. The Sc2+ active crystalline luminescent media are initially doped with trivalent Sc3+ ions during crystal growth. The crystals are then subjected to subsequent processing, such as ionizing irradiation, additive calcining coloration, or electrolytic coloration, to transform Sc3+ ion impurities into an Sc2+ electron configuration.
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