Generation of red light with intense photoluminescence assisted by Forster resonance energy transfer from Znq and DCM thin films.

In this work, a novel experimental investigation of photoluminescence properties of Znq thin films co-doped with different concentrations of DCM were performed. The thin films were successfully deposited on glass substrates with different compositions, under high vacuum, by using the vacuum evaporation technique. For all compositions, the photoluminescence was measured at room temperature and also at low temperature in a wide range from 77 to 300 K with a step of 25 K in a high vacuum. The lifetime of the sample studied in real time was also measured using the decay time technique. The results obtained confirm that the doping influences the intensity of the DCM photoluminescence and also shows a complete energy transfer occurred from Znq to DCM which may have shifted the photoluminescence peak from Znq to the orange wavelength region which is related to DCM. The lifetime of the sample studied in real time was about 4.47 ns for Znq and while all the other samples showed two decay time components. As a result, the doping influences the optical properties of Znq and makes it a potential candidate for optoelectronic applications.