A series of sol-gel derived, La-doped PbTiO3 films, with compositions Pb1-x/100 Lax/100 Ti1-x/400 O3 (PLTX) with La content, x equals 0, 5, 10, 15, 20, 25, 28, 30, and 32 were prepared on Corning 7059 substrates. These films were fired at 400 - 600 degree(s)C for 30 mins. The phase assembly and phase development were dependent on the precursor chemistries (La content) and processing (firing temperature). The grain size of the crystallized PLT films decreased with higher La content, and PLT films with higher La contents appeared denser. The optical properties of the films were investigated using UV - VIS transmission spectroscopy. Depending on composition and processing conditions, PZT films (2500 A thick) with refractive indices of 2.00 - 2.56, sufficient for waveguiding on Corning 7059 glasses with refractive index of 1.53, and band gaps of 3.11 - 3.55 eV can be obtained. Exhibiting high refractive indices, these amorphous and crystalline PLT films can be utilized for both passive and active optical applications.