Sapra, Sameer and Prakash, Ankita and Ghangrekar, Ajit and Periasamy, N and Sarma, D. D (2005) Emission Properties of Manganese-Doped ZnS Nanocrystals. The Journal of Physical Chemistry B, 109 (5). pp. 1663-1668.
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Official URL: http://pubs.acs.org/doi/abs/10.1021/jp049976e
We have performed steady-state and time-resolved fluorescence studies on undoped and Mn-doped ZnS nanocrystals with approximately 16 Å 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.
|Subjects:||Material Science > Nanochemistry|
|Divisions:||Faculty of Engineering, Science and Mathematics > School of Chemistry|
|Deposited On:||27 Jan 2009 09:55|
|Last Modified:||27 Jan 2009 09:55|
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