Blue-light emission from sputtered Ti:SiO/sub 2/ films without annealing

In this report, we found that Ti:SiO/sub 2/ co-sputtered films could emit blue light at room temperature without annealing. Ti:SiO/sub 2/ films were deposited on fused SiO/sub 2/ substrates by using an rf-sputtering apparatus and we used one to two Ti tablets placed on SiO/sub 2/ plate as a target.