The Fluorescence Lifetime of Trans‐Stilbene and its Variation with Temperature

The fluorescence lifetime of trans‐stilbene in solution was measured in the temperature range 300–80 K by three different methods. The decay was found to be mono‐exponential throughout, but prone to falsification by impurities, which may be responsible for the bi‐exponential decays reported by some authors. At room temperature τ F is 80–130 ps, increasing to 1200–1400 ps at 77 K.