Abstract
Near-resonant conditions upon the highly degenerated (2S) Z 1,2-exciton band are used to take advantage of a disorder-induced relaxation of the k-selection rule in order to investigate the unreported direct activation of the (1S) Z 1,2 exciton luminescence in large-size CuCl nanocrystallites. Extremely rich spectra display simultaneously the (1S) Z 3 and (1S) Z 1,2 luminescences. Moreover the unusual antistokes shift between the maxima of the Z 1,2 excitonic absorption and emission bands is attributed to an apparent increase in the spatial confinement due to resonance-related density effects. This point supports the key idea of a resonance-based activation of the Z 1,2 exciton in the photoluminescence spectra.
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