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Thin films of metal-ion doped oxides have attracted considerable attention and applied in diverse research fields because of their full spectrum of various behaviors,such as dielectrics,optical spectroscopy and light-emission,Because of their varied electronic and optical properties,metal-ion doped oxide based thin films are promising for a wide variety of applications,such as high-density energy storage system and optical devices.In the first part of this talk,the pulsed laser deposited TiO2 thin films co-doped with metal-ions and their colossal permittivity properties based on electron-pinned defect-dipoles mechanism will be reported[1].Structural,optical Raman spectra and dielectric properties of the synthesized colossal permittivity materials are presented.The results will benefit for not only investigating the fundamental mechanism of the new class of colossal permittivity materials,but also developing dielectric thin film device applications.In the second part,I will introduce our works on the tuning optical and luminescent spectra in oxide-based thin films and hybrid systems[2-4].Interestingly,some metal ions can be regarded as spectroscopic probes for the dopant site symmetry and structure[4-6].Therefore,it is of interest to take advantage of the unique properties of oxide host material in combination with the doping metal ions.The work was supported by Research Grants Council ofHong Kong(GRF No.: PolyU 153004/14P).