The emission properties of cyclic carbazole oligomers are described. The ph
otoluminescent spectra of these cyclic oligomers excited by 350 nm as an ex
citation wavelength in chloroform have been measured. We found that the emi
ssion properties of o-xylene-derived cyclic dimer were different from those
of p- and/or m-xylene-derived cyclic dimers although they have the similar
molar absorption coefficients and structures. The electroluminescent prope
rties are also described.