is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. (0 0 4) anatase. An UV to NIR photon conversion is evidenced in the films. Indeed, intense and wellresolved emission lines from Nd 3+ have been observed upon excitation above the TiO 2 bandgap at room temperature. The sensitised emission of Nd 3+ is found to be much efficient in rutile than in anatase structure. Low temperature photoluminescence measurements lead to fine resolved peaks corresponding to the Nd 3+ 4f transitions with different spectral characteristic according to the host matrix used. Photoluminescence dependence temperature evidences that the light emission from Nd 3+ in anatase-based films is probably influenced by the presence of self-trapped excitons or by orbital interaction. Mechanisms of sensitisation host to Nd 3+ are proposed for both matrixes. Finally, the Nd dopant concentration and the microstructure of TiO 2 rutile films are found to affect the photoluminescence emission intensity. Rutile film (2 0 0) oriented is the most adapted host matrix to sensitise 1 at.% Nd 3+ ions for an emission around 1064 nm making such Nd-doped layers interesting for photon conversion by down shifting process.