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Summary form only given. Studying the photoluminescence (PL) decay is important when characterizing materials as light-emitting media. The method we propose in this paper is a time-integrating gate (TIG). This method uses a step function instead of a delta function as the time-delayed gate. In the particular case of an exponential decay (which seems to be the case for the conjugated polymers), integrating the light emitted from a certain time on gives the same time dependence (exponential) as the PL decay.