Thermoluminescence, optical absorption, photoluminescence, FT-IR and XRD studies on l-arginine doped orthophosphoric acid

A paper report on the thermoluminescence (TL) optical absorption, photoluminescence (PL), single crystal XRD studies on l-arginine doped orthophosphoric acid confirm that a crystal belongs to the orthorhombic system with space group p212121. The lattice of most of these crystals forming the composite, in spite of whatever the phase it belongs to, it is spatially coherent to each other with in the crystalline bulk. The functional groups present in the crystal confirms that using FT-IR technique optical absorbance shows meagre absorption from the entire visible region. The TL glow curve of l-arginine doped orthophosphoric acid sample marked a prominent peak at 125, 254 and 303 °C along with small peak at around 218 °C. Correlation with changes in optical absorption suggest that a peak at 125 °C to be related to process involving Z1 center. The peak follows first order kinetics with an activation energy of 0.033 eV and a frequency factor of 7.45×102 and FWHM 61 nm.