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Semiconductor nanoparticles of cadmium chalcogenides are known to exhibitpronounced thickness-dependent $E_0$ series of exciton transitions at the$\Gamma$ point of the Brillouin zone (BZ). In this work, we report anexperimental evidence for high-energy series of exciton transitions, whichoriginates from BZ points different from the $\Gamma$ point, in the family ofcadmium chalcogenide quasi-2D nanoplatelets (NPLs). Intensive UV absorptionbands demonstrating a pronounced size effect are observed for CdTe, CdSe, andCdS NPLs in addition to the $E_0$ exciton bands in the visible region. Thesenew bands are attributed to transitions analogous to the $E_1$, $E_1+\Delta_1$,and $E_2$ series observed in bulk crystals. First-principles DFT calculationsof the electronic structure and absorption spectra support this explanation andshow that the main contribution to these optical transitions comes from $X$ and$M$ points of the 2D BZ, which originate from $L$ and $X$ points of the 3D BZ.At the same time, the $E_0$ series of transitions at the $\Gamma$ point is welldescribed by the multiband effective-mass model. The observation of the UVexciton bands reveals tunable optical properties of cadmium chalcogenide NPLsin UV spectral region, which may be interesting for practical applications.

High-energy exciton transitions in quasi-two-dimensional cadmium chalcogenide nanoplatelets