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A new organic-inorganic by brid material doped with BDK that exhibits a large photo-induced change in optical properties is prepared by the sol-gel method.The photosensitivity of the film under ultraviolet irradiation is investigated with various exposure times.An increase in refractive index from 1.558 to 1.592 at A=550nm is observed together with a 57.3% expansion in physical thickness.The films optical thickness exhibits an exponential change with the irradiation time.The photo-decomposition of BDK organic groups confirmed by the infrared absorption spectrum contributes to the photosensitive mechanism.A first example of photo-patteing is finally presented by direct light writing.