Effect of fluorescein dye on optical and thermal properties of sulphamic acid single crystals

Optically transparent single crystals of sulphamic acid (SA) and Fluorescein dye doped crystals with 0.1 mol % (SFL1) and 0.3 mol% (SFL3) are generated using the slow evaporation solution approach. The unit cell characteristics of the crystal that were generated were determined using single-crystal X-ray diffraction. The single crystal X-ray diffraction (XRD) analysis indicates that the crystal formed has an orthorhombic structure. The space group has been determined to be Pbca. Cell volume is found to increase as doping concentrations increased. The identification and allocation of functional groups were accomplished using FTIR and Raman spectroscopy. A little augmentation in the lattice parameter was detected in the single crystal X-ray diffraction (SCXRD) analysis. FTIR and Raman spectra exhibited minor shifts in peak positions and change in intensity. The optical quality of the generated crystals has been assessed by UV-visible examinations, which have confirmed that the developed crystals exhibit a decreased cut-off wavelength at 266, 263, and 261 nm, respectively. These crystals has lower cutoff wavelength which shows that these are the preferable material for many optical applications. The optical band gap values are determined to be 5.13 eV, 5.2 eV, and 5.14 eV from tauc relation, respectively. It was observed that doped crystals exhibited a substantial enhancement in thermal stability and decomposition temperature. The enhanced optical characteristics and heightened thermal durability of the doped crystals underscore its suitability for optoelectronic applications and also for optical switching.