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Luminescence spectra, measured at 77 and , of thick (a) and thin [(b), (c), and (d)] CuBr films grown on [(a) and (b)], KCl (c), and KBr (d) substrates. All the luminescences were excited at the same photon energy, .
Luminescence spectra at before (curve 1) and after (curve 2) the correction for absorption was made, in the exciton transition energy region of the CuBr films, whose spectra in the extended region are shown in Fig. 1. For comparison, the absorption spectra are also shown with the maximum heights being taken to be equal to those of curve 2.
Luminescence and absorption spectra at of a thick CuCl film grown on a substrate. The same caption as that of Fig. 2 applies to this figure.
Integrated PL efficiencies at corrected for absorption, in unit of the integrated PL efficiency at of the band of the thick film. For convenience, the PL efficiencies of the DA bands are taken as the total efficiencies minus the PL efficiencies of the bands.
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