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.
Emission_Properties.pdf - Published Version
Restricted to Registered users only
Download (124Kb) | Request a copy
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|
|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|
Actions (login required)