Dye doped sulphamic acid crystals: a potential material for optoelectronic applications

This is the first study to look at how organic dyes Reactive Orange 16 (RO 16) and Safranin affects the optical and thermal characteristics of a sulphamic acid crystal (SA). Single crystals of pure SA, Reactive Orange 16-doped sulphamic acid (ROSA) and safranin-doped sulphamic acid (SAFSA) were synthesized using a slow evaporation process. The crystalline nature of the produced crystals was investigated using powder X-ray diffraction (XRD). The Williamson–Hall (W–H) approach was used to compute the crystallite size. The existence of functional groups was revealed using FTIR spectroscopy. The unique absorption bands in the UV–Vis–NIR absorption spectra indicated the presence of dopants in the SA crystal. Based on the transmittance measurements, optical constants, namely the optical band gap ( E g ), extinction coefficient ( k ), refractive index ( n ) and optical conductivity ( σ ), were computed. Doped crystals were found to have significantly improved thermal stability and decomposition temperature. The increased optical properties and thermal stability of the doped crystals highlight its viability for optoelectronic applications.