Cu2ZnSnS4 bulk polycrystalline were synthesized by pressureless sintering (PLS) method in vacuum and spark plasma sintering (SPS) method. It was confirmed that there were no the secondary phases in a sample sintered by SPS method at 750 degrees C from the results of powder X-ray diffraction (XRD) patterns and Rietveld refinement. The Raman spectrum of the sample showed the strongest peak at 338 cm(-1) with a shoulder at 350-370 cm(-1), and the weaker peaks at about 255 and 289 cm(-1), which originated from Cu2ZnSnS4. The FWHM of the strongest peak of 7.4 cm(-1) was narrower than other samples. The photoluminescence (PL) spectrum measured at 15 K were observed a broad emission band with the maximum at 1.26 eV. Also, the measured photoluminescence excitation (PLE) for the band-edge emission was originated the energy transfer from the band-to-band excitation. The obtained activation energy was 62 +/- 9 meV. (C) 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim