Third order nonlinear optical, luminescence and electrical properties of ʟ-phenylalanine ʟ-phenylalaninium bromide bulk crystals

Optical quality ʟ-phenylalanine ʟ-phenylalaninium bromide (LPLPB) bulk crystals were grown by slow evaporation technique. The third order nonlinear refractive index and nonlinear absorption coefficient of the grown crystal were measured by Z-scan studies. The third order nonlinear susceptibility was found to be 1.8792 х 10−4 esu which is fairly higher than the other compounds. The Photoluminescence spectra reveal the emission bands for LPLPB crystals. The Photoconductivity studies were employed to determine the dependence of photocurrent on the applied electric field. Negative photoconductivity was exhibited by the sample. The d. c. conductivity of the grown crystal was measured by the complex impedance analysis wherein the obtained plot in the form of semicircle finds application in Debye relaxation for materials having large dc conductivity.