Organic nonlinear optical (NLO) single crystals of 4-aminopyriclinium 4-nitrophenolate 4-nitrophenol (4AP4NP) were grown by the slow evaporation solution growth technique. The unit cell parameters and space group of 4AP4NP crystal were found out by single crystal X-ray diffraction analysis. From the UV-vis-NIR spectral studies, the lower cut-off wavelength of the grown crystal was found to be 474 nm. The laser damage threshold study shows that 4AP4NP crystal withstands the laser radiation up to 3.67 GW cm(-2). Thermogravimetric and differential thermal analyses revealed that 4AP4ANP is thermally stable up to 175 degrees C. The specific heat capacity of 4AP4NP was measured to be 3.9135 J g(-1) K-1 at 33 degrees C. Kurtz and Perry powder study reveals that 4AP4NP is a phase-matchable NLO material. The four independent tensor coefficients of dielectric permittivity were found to be epsilon(11) =25.09, epsilon(22) = 25.84, epsilon(33) = 26.69 and epsilon(13) = 0.8 from the dielectric measurement. (C) 2015 Elsevier B.V. All rights reserved.