Poly(methacrylate) copolymer containing 95 mol% of photoreactive H-bonded mesogenic unit 4-(6-hydroxyhexyloxy)cinnamic acid (6CA) and 5 mol% of luminescent unit 2,7-bis[2-(4-hydroxyphenyl)-2-cyanovinyl]-9,9-dihexyl-9H-fluorene (CN-DHFP) was synthesized and characterized. The irradiation with LPUV light resulted in the induction of a small negative optical anisotropy (ΔA) in the films due to the axis selective photoreaction of the cinnamic acid group. After annealing, the negative optical anisotropies both 6CA and CN-DHFP groups were significantly enhanced. The enhanced reorientation direction of both groups was perpendicular to E of LPUV light. Polarized blue emission was obtained with polarization ratio of about 2.0.

The polarization state of the diffraction light from the polarization holographic grating on varying the polarization conditions of the writing beams has been investigated on the basis of Jones theory. The authors found that the polarization holographic grating, which was fabricated by irradiating the two writing beams with around 0.2 of polarization ellipticity, could convert circularly polarized light into linearly polarized light, and the anisotropic phase grating under above-mentioned condition was really fabricated using the photo-cross-linkable polymer liquid crystal. This function, not observed in the conventional polarization gratings, should be widely applied as highly functionalized optical devices.