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

Published inJournal of physical chemistry. C, vol. 116, no. 16, p. 9300-9310
Publication date2012
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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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. doi: 10.1021/jp300765y
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ISSN of the journal1932-7447
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Creation04/26/2012 7:52:00 AM
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