Phosphorescence materials show a longer life time, around milliseconds, whereas fluorescence emission falls in the micro/nano seconds range: therefore, this parameter is easier to measure and so, be used to characterize the sensor.
Life time - as pointed phosphorescence sensors slowly decay to the ground state thus it is easier to measure and vidualize changes in the presence or absence of chemical stimuli.
As per my knowledge, Phosphorescence sensors are suitable to those systems which we can make use of their good photochemical properties to come out with better sensitivity and stability also selectivity when compare to other method of sensors...
With phosphorescent sensors, you can use the time-gated measurement technique to avoid interference from background fluorescence signal. This can greatly improve signal-to-noise ratio.
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