A COMPARATIVE-STUDY OF ELECTRONIC-STRUCTURE OF ALKALINE-EARTH SULFIDES AS HOSTS FOR PHOSPHORS

Electronic structures of alkaline earth sulfides have been investigate d using the augmented spherical wave band structure approach and scatt ered wave cluster molecular orbital method. The calculated energy eige nvalues provide a satisfactory explanation of the observed energy gap for these materials. The conduction band states have been carefully an alyzed to determine the suitability of these materials for their use a s lamp phosphors. The electronic structure of a divalent europium ion in sulfide environment is also discussed.