Enhanced optoelectronic and dielectric performance of Coleus amboinicus mediated Urea-doped KHP single crystals

This article delves into the synthesis and characterization of Coleus amboinicus mediated urea-doped KHP single crystals, focusing on their enhanced optoelectronic and dielectric properties. The study reveals that these crystals exhibit superior nonlinear optical efficiency, with a 2.8-fold improvement compared to potassium hydrogen phthalate (KHP). The crystals were successfully synthesized using a solvent-based slow evaporation method and characterized using various techniques, including single-crystal and powder X-ray diffraction (PXRD), Fourier transform infrared (FTIR) spectroscopy, and impedance spectroscopy. The results demonstrate that the crystals adopt an orthorhombic lattice structure with high crystallinity and minimal defect density. Optical measurements indicated a short-wavelength UV cutoff at 301 nm and a direct optical bandgap of 4.81 eV, suggesting enhanced resistance to optical damage. The dielectric analysis showed a frequency-dependent decline in the dielectric constant, indicative of strong polarization stability and minimal dielectric loss. These findings highlight the potential of KUCA crystals for advanced photonic and electro-optic device applications, making them a compelling candidate for next-generation optical technologies.