Abstract
We have studied photocalorimetric spectra (PCS) of characteristic exciton transitions in BiI 3 crystals. Our PCS measuring system has the sensitivity of less than 10 -12 J for the detection of photo-thermal heating after photo-excitation. The photocalorimetric (PC) spectra are analyzed quantitatively by comparing the net absorbance spectra obtained from the simultaneous measurements of reflection and transmission for the first time. Above the absorption edge, the PCS signal intensity well corresponds to the total amount of absorbed light energy. For the excitation at stacking fault excitons, the PC spectrum shows sharp structures, but the amount of PCS signal is only a small fraction of the absorbed light energy. This result corresponds to the intense resonant luminescence and cascade-type relaxation among these exciton states.
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