Centra-5 UV-VIS spectrometer, supplied by GBC Scientific Equipment Pty Ltd. (Australia), was used in this work for absorption measurements. Laser induced fluorescence of the dyes have been
produced using a diode-pumped solid state green laser as a light source of wavelength 531.5nm, CW output power of 10 mW with line width 2 nm and 2 mm beam diameter. The dye fluorescence emission was detected through a Jarrell ash monochromatic model 82-000. This unit is an Ebert scanning spectrometer of 0.5 meter focal length with eight speed electric drives and plane reflection grating of 1180 groove/mm. The detection unit is a photomultiplier PMT (type S666 Hamamatsu), which was connected to an X-Y/t recorder (SIEMENS) to record the output signal.