Heterogeneous Halide‐Silica Phosphors

Efficient photoluminescence in phosphors containing about 90% and 10% or other halides is observed after activation with Eu+2 (violet to blue colors) or Eu2+ plus Mn2+ (yellow to red). The materials are heterogeneous, consisting of luminescent halides dispersed in small segregations inside of bigger and nonluminescent particles. The phosphors are stable in water and acids (except ) because the hygroscopic halides are protected by surrounding .