Abstract:
The aim of this research was the study of Phenoxazone 9 dye
photosensitization; By using coherent and non coherent light sources;
The emission spectroscopy was used to investigate the production of
singlet oxygen, which has therapeutic effect from this dye after
irradiation.
Five
samples
acetone
were
prepared
using
ethanol,
propanol
,
toluene,
and chloroform to dissolve Phenoxazone 9 . Three light
sources were used to irradiate the mentioned samples. Firstly, blue
light emitting diode (LED) (450 - 470 nm) with power of 60 μW.
Secondly, He Ne laser (632.8 nm), with output power of 1 mW.
Thirdly, green diode laser (532 nm) with output power of 4 mW. A
spectrometer connected to PC was used to collect and record the
emission spectra of the samples with different time.
The results showed that the most efficient solvents to produce singlet
oxygen were acetone and ethanol, which gave positive results with
each light source used. Toluene and chloroform produced singlet
oxygen when coherent light source (laser) was used, but propanol
succeeded to produce single oxygen with He Ne laser only. The best
light source to produce singlet oxygen from phenoxazone 9 in the
solvents was He Ne laser, unlike green diode laser and LED, where
the first failed with propanol and the second failed with propanol,
toluene and chloroform.
The highest production of singlet oxygen form phenoxazone 9 was
found when it dissolved in acetone and irradiated by green diode laser
with exposure time of four minutes where two emission peaks of
singlet oxygen at 703 nm and 634 nm were recorded.
