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The effect of temperature (103 K &lt; T &lt; 303 K) upon the limiting fluorescence anisotropy r 0  of POPOP was investigated in a cellulose acetate film. A slow increase in r 0  was observed when reducing the temperature. Based on the Jabłoński theory, the frequency of the torsional vibrations of POPOP was determined to be w = 1.3 x 10 12 s −1 . The depolarization due to these torsional vibrations was found to occur immediately following excitation during the thermal relaxation of the luminescent centre, thus somewhat lowering the value of the fundamental fluorescence anisotropy r f  to the limiting r 0  value.

Temperature Dependence of Limiting Fluorescence Anisotropy of POPOP in Cellulose Acetate Film