Time–space conversion spectral analysis for the nanosecond fluorescent processes of organic–inorganic compounds

Time-resolved spectral measurements were conducted by using a continuous-wave laser and a CCD-based spectrometer. A spinning polygon mirror swung both the excitation laser beam and fluorescent rays, in the process of which a temporal change in the fluorescent spectrum was converted to a spatial distribution. The temporal resolution could be adjusted in the nano- and micro-second ranges by changing the rotation rate of the mirror. In comparison with the conventional pulsed-laser spectrometry, a higher sensitivity is attainable due to the slow features of the devices, i.e., continuous excitation by the laser and a long exposure time (1 s) of the CCD. The usefulness and reliability of the constructed system were demonstrated by spectral measurements of an organic–inorganic hybrid phosphor, which exhibited both a rapid fluorescent decay of organic ligands and a long-lasting afterglow of metal ions.