Coupling Ti doping with oxygen vacancies in tungsten oxide for high-performance photochromism applications.

A series of Ti-doped W 18 O 49 samples were prepared using a convenient solvothermal route. Due to the synergistic effect of doped Ti and oxygen vacancies, the samples showed excellent visible-light photochromic properties. Their performances as light-printable rewritable paper and smart windows showed great application value and promotion value.