Abstract
We have observed luminescence spectra of vapor-deposited CuCl films on rutile TiO 2 under photo-irradiation with picosecond light pulses at 4.6 K. Decrease in the Z 3 -exciton and I 1 luminescence intensities and an appearance of new exciton luminescence are found to be induced by the photo-irradiation. From the excitation photon energy dependence of the luminescence spectra, it is found that the Z 3 -exciton luminescence is resolved into two components: one is attributed to the optical phonon Raman lines and the other to the free Z 3 -exciton luminescence. The intensity of the Raman lines resonantly increases at the Z 3 -exciton band resulting in the optical phonon structures in the excitation spectrum. The excitation spectra of the new exciton and I 1 luminescence are similar to the absorption spectrum of CuCl, which suggest that the resonant Raman process observed in the Z 3 -exciton luminescence hardly contributes to the generation of the excitons associated with the new exciton and I 1 luminescence.
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