Nanosecond emission spectroscopy
Nanosecond transient emission spectroscopy (ns-TES) is a used to time-resolve the emission of long-lived excited states with decay dynamics longer than 10 ns. Often it is used to temporally characterise slow excited state chemical reactions, such as triplet recombination, phosphorescence, triplet-triplet annihilation, triplet-upconversion and thermally activated delayed fluorescence. Samples are excited with a broadly tuneable (225 – 2600 nm) 5 nanosecond pump pulse. The emission signal from the sample is collected and spectral analysed with a spectrometer. Single-wavelength kinetics can be recorded with a single-element detector (photomultiplier tube). Broadband spectra can also be detected with a 10-ns gated CCD camera.