Graphitic carbon nitride (g-C3N4) nanopowderwas synthesized by thermal decomposition of urea . X-ray diffraction(XRD) spectra confirms the structure of g-C3N4.Chemical bonding of the sample has been investigated by Fourier transform infrared spectroscopy (FTIR). The particle size analyser revealed the size is 94nm. g-C3N4showed a band gap of 2.72eV which falls in visible light. Synthesized nanomaterial was taken further for thin film fabrication using Poly Vinyl Alcohol(PVA) by dip coating method. The optical property of g-C3N4 thin film was analysed. Photoluminescence showed emission spectra at 450nm. The luminescent properties of g-C3N4 thin film may have potential application as component of optical nanoscale devices.