Emission Properties of Manganese-Doped ZnS Nanocrystals

Sapra, Sameer and Prakash, Ankita and Ghangrekar, Ajit and Periasamy, N and Sarma, DD (2005) Emission Properties of Manganese-Doped ZnS Nanocrystals. In: Journal of Physical Chemistry B, 109 (5). pp. 1663-1668.

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Abstract

We have performed steady-state and time-resolved fluorescence studies on undoped and Mn-doped ZnS nanocrystals with approximately 16 A diameter. While there is no band-edge emission, the intensity of the steady-state blue fluorescence from ZnS surface states decreases upon Mn incorporation, which gives rise to an orange emission. These results show that Mn incorporation competes very effectively with the donor-acceptor surface states for the energy transfer from the electron-hole pair excited across the band gap. In both undoped and doped samples, the time-resolved fluorescence studies establish the presence of a distribution of decay lifetimes possibly due to a number of emission centers in the nanocrystals. A faster short-time decay of the blue emission in the Mn-doped samples compared to that in the undoped sample suggests an additional decay channel for the surface states via an energy transfer from these states to the dopant levels.

Item Type:	Journal Article
Publication:	Journal of Physical Chemistry B
Publisher:	American Chemical Society
Additional Information:	The copyright of this article belongs to American Chemical Society.
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	09 Mar 2005
Last Modified:	20 Jan 2012 06:09
URI:	http://eprints.iisc.ac.in/id/eprint/2862

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