NON-STOICHIOMETRIC TETRAGONAL COPPER ALKALINE EARTH SILICATE PHOSPHOR AND METHOD OF PREPARING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide more stable phosphors with a more rigid surrounding of the activator ions in a silicate matrix and to provide silicate phosphors with high temperature stability and lower sensitivity against humidity.SOLUTION: A non-stoichiometric luminescent material for a light emitting device is a silicate phosphor having tetragonal crystal structure and having more silicon in the crystal lattice than that in the crystal lattice of silicate phosphors having stoichiometric crystal structure. The luminescent material contains divalent copper in the matrix and europium as an activator.