Usage of different lasers to produce emission of light from some dyes

Abstract

In this work, the emission of some dyes were studied after excitation by different lasers. The emitted light can be used for different applications including Photodynamic Therapy (PDT). The dyes were preparedfrom (Alcain blue, Coumarinand bromocresol) dissolved in (Propanol, Ethanol and chloroform). UV visible spectrometer was used to record the absorption spectra for the solvents and the dye samples. Then the samples were irradiated by different light sources; firstly LED (365 nm) with output power 1200 mW, secondly by the green diode laser (532 nm) with output power 100 mW. Thirdly the red diode laser (671 nm) with output power 100mW. USB 2000 spectrometer wasused to record the emission spectra of the samples with different times. From the obtained results it was concluded that the most efficient sample to produce singlet oxygen, which is used for PDT, was the Alcian blue dissolved in chloroform after irradiation by the green diode laser (532 nm) where a peak of singlet oxygen at (634 nm) was recorded. Some recommendations were suggested, as future work, in the end of this work.