Novel triphenodioxazines have been synthesized and evaluated. The dyes were
not only highly dichroic in guest-host liquid crystal mixtures but also vi
vid because of a sharp peak in absorption spectra. Mesogenic substituents t
o the 2,9-position of the chromophore improve the order parameter in the mi
xture. Moreover. the mixtures also showed significant polarized photolumine
scence. These results would reveal a few advantages of the novel dyes for s
ome possible applications.