Effect of urea on optical properties of potassium hydrogen phthalate (KHP) single crystals for NLO applications

Abstract

Semi-organic carbamide (urea) doped potassium hydrogen phthalate (KHP) crystals grown from slow evaporation solution growth technique. The grown crystals were subjected to powder XRD analysis and doped KHP crystallizes in orthorhombic structure with space group Pca21. FTIR spectrum confirms the presence of major functional groups and shows minor distortion of functional groups due to effect of dopant. SEM studies revealed, the effectiveness urea dopant on surface morphology of grown crystals. From thermal studies, it is found that, both undoped and urea doped KHP were stable up to 300 °C. UV–Visible studies showed, the grown crystals were transparent in the entire visible region and calculated optical band gap from Tauc’s plots. The SHG studies of the grown crystals have been confirmed by Kurtz-Perry powder technique.

Keywords

• Lattice parameters
• TG-DTA
• Tauc plot
• Second harmonic generation