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The fluorescence and phosphorescence spectra of biphenyl in a cyclohexane shpol’ skii matrix are sharp. We shall present vibrational analyses and compare the spectra with those obtained in rare gas matrices by Baca, Rossetti, and $Brus1$. We have also studied the luminescence spectra of the three unique monochloro-derivatives of biphenyl. The substitutional position dependence of the excited decay rates, both from $S1$ and $T1$ will be discussed.