Processing and Application of Ceramics (Mar 2010)

Laser-induced fluorescence measurements on CdSe quantum dots

  • Zoltan Győri,
  • Dávid Tátrai,
  • Ferenc Sarlós,
  • Gábor Szabó,
  • Ákos Kukovecz,
  • Zoltán Kónya,
  • Imre Kiricsi

Journal volume & issue
Vol. 4, no. 1
pp. 33 – 38

Abstract

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In this paper, we report on photoluminescence decay measurements on CdSe quantum dots (QDs) as a function of size in the diameter range of 2.1 to 3.5 nm. The nanoparticles were synthesized by the kinetic growth method from CdO and elemental Se precursors. We studied the effects of growth time on the diameter, emission spectrum and the fluorescence lifetime of the synthesized QDs. The decay time measurements were performed using single shot time-resolved laser-induced fluorescence techniques using a Nd:YAG laser system. Two different decay times were measured on each CdSe sample, a fast one and a relatively slow one. The slow decay was found to be size dependent whereas the fast one was independent of the QD diameter.

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