Toggle Main Menu Toggle Search

Open Access padlockePrints

Distributed luminescence from alkyl-capped silicon quantum dots

Lookup NU author(s): Rebecca Rostron, Dr Ben Horrocks, Dr Gareth Roberts


Full text for this publication is not currently held within this repository. Alternative links are provided below where available.


Orange luminescence attributable to a core of silicon atoms in alkyl-capped crystalline quantum dots excited at lambda(a) = 355 and 405 nm is investigated as a function of applied intensity and time. The intensity of luminescence displays a linear power dependence on the intensity of the applied field, from which an exponent n = 0.94 +/- 0.02 commensurate with single-photon absorption is derived. The dependence of luminescence on time is observed to be strongly nonexponential and is optimally accounted for by a probability density function which describes a continuous distribution of two decay times: the behavior is characteristic of a pair of elementary steps connected with light emission within a distribution of local environments, or a single rate process supported by two environments. Nonlinear least-squares fits to the time dependent luminescence formulated on this basis with a Gaussian, Lorentzian, or log-normal distribution of rates return most probable lifetimes (T) over bar (1) = 21 + 1 mu s and (T) over bar (2) = 3.7 + 0.8 mu s. The widths of the distributions vary between sigma(1) = 0.01-0.03 mu s(-1) and sigma(2) = 0.14- 1.1 mu s(-1) associated with 1/(T) over bar (1) and 1/(T) over bar (2), respectively. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3120787]

Publication metadata

Author(s): Rostron RJ, Horrocks BR, Roberts G

Publication type: Article

Publication status: Published

Journal: Journal of Applied Physics

Year: 2009

Volume: 105

Issue: 9

Pages: 094302

ISSN (print): 0021-8979

ISSN (electronic): 1520-8850

Publisher: American Institute of Physics


DOI: 10.1063/1.3120787

Notes: Article no. 094302 8 pages


Altmetrics provided by Altmetric