摘要 : We have observed luminescence spectra of vapor-deposited CuCl films on rutile TiO, 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 n... 展开 We have observed luminescence spectra of vapor-deposited CuCl films on rutile TiO, 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. (c) 2004 Elsevier B.V. All rights reserved. 收起