Semiconductor quantum dots attract a lot of attention for their application in many fields such as optoelectronic and biology. In the study, we investigated optical properties of hybrid nanocomposited thin films made of PMMA polymer containing different concentrations of core-shell CdSe/ZnS quantum dots. Both absorption and luminescence spectra can be well explained by taking into account quantum mechanisms. From the luminescence spectra a clear evidence of coupling effect between quantum dots has been observed. With a pump laser emitting at 514 nm the luminescence spectrum centered at 560 nm strongly changes with time. Besides, for applications, it would be necessary to control the luminescent light spatial distribution. We proposed for this to structure the films with a bi-periodic grating by nanoimprint technique using an engraved silicon mold. The characterization of the imprinted structure show the good quality of the method used. We also show, by numerical calculation, that the local field is resonant in the periodic structure and that the emission diagram can be controlled in the far field.
