The authors report the preparation of a free-standing film of the cholesteric blue phase II by photopolymerization, and investigate its fluorescence characteristics upon optically pumping the sample. Before polymerization, laser emission was observed from the long band-edge wavelength of the selective reflection band of the blue phase. After polymerization, laser emission was not observed from the band-edge wavelength, but appeared to have red-shifted possibly due to a distortion of the helix.