“…For instance, these glass filters are effective for complete removal of UV radiation in bright light sources used in multimedia equipment such as projectors. Several years ago, we reported a new preparation method for copper(I) halide nanocrystallite-doped glasses for use in this area [27,28], in which copper ions are incorporated into halide ion-containing glasses by means of staining, resulting in the precipitation of copper(I) halide nanocrystallites in the glass surface region. This staining method is a conventional and convenient way of coloring glass [29][30][31][32][33] and provides a possible low-cost preparation method for copper(I) halide nanocrystallite-dispersed glasses.…”