Abstract
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.
Highlights
Photoluminescence that is used in illuminators and amplifiers provides a useful tool for material analyses
The hybrid phosphor exhibited an emission peak in the negative region (Δx < 0). Since this peak height was independent of the position, its origin was assumed to be an afterglow of the Eu ions, i.e., as we describe at the end of this section, the fluorescent lifetime of the Eu ions was longer than 200 μs, and the afterglow remained until the arrival of the succeeding excitation beam
Time-resolved spectral measurements were conducted in the nanosecond to microsecond range by using a continuous-wave laser diode and a CCD-based spectrometer
Summary
Photoluminescence that is used in illuminators and amplifiers provides a useful tool for material analyses. Organic dyes generally exhibit a high emission efficiency, they tend to suffer a serious damage (bleaching) by photo- or thermo-chemical reactions.[1,2] By contrast, inorganic (lanthanide) phosphors have a disadvantage of poor excitation efficiency despite their excellent durability against hazardous environments.[3,4,5] Chemists have recently synthesized organic–inorganic compounds to improve the excitation efficiency of lanthanide ions.[6,7,8] In these hybrid phosphors, an electronic energy is transferred from the absorptive organic ligands to the luminescent lanthanide ions.[9,10] Efficient light amplification has been demonstrated by using these compounds.[11,12,13]
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