Our team has previously reported near complete suppression of Photoluminescence (PL) blinking in nanocrystal quantum dots (NQDs) in the visible spectral range with a core/thick-shell CdSe/CdS NQD system.  NQDs capable of emitting blinking-free PL in the near-infrared (NIR) spectral range are highly desirable for applications ranging from bio-medical imaging to telecommunications. We now report on thick-shelled InP/CdS NQDs, which emit blinking free PL in the NIR (700 �1000 nm).  Blinking suppression is studied as a function of shell thickness by analyzing the PL emission characteristics of many single InP/CdS NQDs.  Specifically, utilizing time correlated single-photon counting techniques, we analyze the fluorescence lifetime intensity distribution of individual dots to understand the various blinking mechanisms involved.  We discuss the effect of NQD band structure as it relates to blinking by comparing and contrasting this type-II system to CdSe/CdS NQDs with a quasi-type II band structure.

Understanding photoluminescence intensity and lifetime fluctuations in individual NIR emitting nanocrystal quantum dots

243rd National Meeting (2012)

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