Alkali iodide doped zinc sulfide electroluminescent phoshor

摘要

An electroluminescent phosphor containing an alkali iodide dopant, such as lithium iodide or potassium iodide, and having CIE coordinates of x=0.173 to 0.187 and y=0.392 to <0.424. The phosphor without alkali iodide dopant has CIE coordinates of x APPROX 0.180 to 0.184 and y APPROX 0.424 to 0.426. The method of making the phosphor includes adding the alkali iodides during a second firing step.