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Title

Luminescence Saturation via Mn 2+ –Exciton Cross Relaxation in Colloidal Doped Semiconductor Nanocrystals

Authors
Bradshaw, Liam R.
McLaurin, Emily J.
Gamelin, Daniel R.
Published in Journal of Physical Chemistry. C. 2012, vol. 116, no. 16, p. 9300-9310
Abstract Colloidal Mn2+-doped semiconductor nanocrystals such as Mn2+:ZnSe have attracted broad attention for potential applications in phosphor and imaging technologies. Here, we report saturation of the sensitized Mn2+ photoluminescence intensity at very low continuous-wave (CW) and quasi-CW photoexcitation powers under conditions that are relevant to many of the proposed applications. Time-resolved photoluminescence measurements and kinetic modeling indicate that this saturation arises from an Auger-type nonradiative cross relaxation between an excited Mn2+ ion and an exciton within the same nanocrystal. A lower limit of k = 2 × 1010 s–1 is established for the fundamental rate constant of the Mn2+(4T1)-exciton cross relaxation.
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Other version: http://pubs.acs.org/doi/abs/10.1021/jp300765y
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Research group Groupe Hauser
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BRADSHAW, Liam R. et al. Luminescence Saturation via Mn 2+ –Exciton Cross Relaxation in Colloidal Doped Semiconductor Nanocrystals. In: Journal of Physical Chemistry. C, 2012, vol. 116, n° 16, p. 9300-9310. https://archive-ouverte.unige.ch/unige:20259

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Deposited on : 2012-04-30

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