Enhanced photoluminescence from CdS:Mn/ZnS core/shell quantum dots

Yang, Heesun; Holloway, Paul H.
March 2003
Applied Physics Letters;3/24/2003, Vol. 82 Issue 12, p1965
Academic Journal
Enhanced photoluminescence (PL) is reported from Mn[sup 2+]-doped CdS nanocrystals capped with ZnS (CdS:Mn/ZnS core/shell) that were prepared using a reverse micelle route. Compared to organically (n-dodecanethiol) capped CdS:Mn nanocrystals, CdS:Mn/ZnS core/shell nanocrystals exhibited much stronger and sharper Mn[sup 2+] [sup 4]T[sub 1] - [sup 6]A[sub 1] yellow PL emission. This is presumably the result of effective passivation of CdS surface states by the ZnS shell and consequent suppression of nonradiative recombination transitions. The core/shell nanostructure was confirmed using x-ray photoelectron spectroscopy and energy dispersive spectroscopy data.


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