Method of controlling the concentration of divalent europium in the phosphor

摘要

concentration adjusting method of divalent europium in the phosphor by reducing trivalent europium to the divalent state, characterized in that the synthesized phosphor containing europium to divalent and trivalent states, annealed in vacuo at a pressure of 10mm Hg at a temperature of 900-1270 ° C for 0.5-2 hours.