Caution for monitoring the surface modification of dually emitted ZnSe quantum dots by time-resolved photoluminescence

Nanotechnology
Chunlei WangYiping Cui

Abstract

This work wants to give a caution for monitoring the surface modification of dually emitted ZnSe quantum dots (QDs) by using time-resolved photoluminescence (PL). Aqueous ZnSe QDs have two emission bands: namely ZnSe band gap emission centered at 395 nm and ZnSe trap emission centered at 470 nm. By fitting the measured PL spectra by two peaks, serious overlapping of two emission bands can be found in the range of 360-430 nm. As a result, the measured PL lifetimes at 395 nm (the peak position of ZnSe band gap emission) is just an apparent value, composing of both ZnSe band emission (contribution proportion about 80%) and ZnSe trap emission (contribution proportion about 20%). Due to the much smaller PL lifetime of ZnSe band gap emission (less than 20 ns) than that of ZnSe trap emission (about 50-70 ns), the elevated contribution proportion of ZnSe band gap emission at improved QD surface modification will lead to the decreased average PL lifetime at 395 nm. This result is completely opposite to the traditional result where improved QD surface modification leads to increased PL lifetimes on the basis of single emitted QDs. Hence, when time-resolved PL is used for monitoring the surface modification of dually emitted QDs, the emis...Continue Reading

References

Aug 4, 2005·Journal of the American Chemical Society·David BattagliaXiaogang Peng
Jul 16, 2010·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Rongqing LiYiping Cui
Aug 31, 2011·Journal of the American Chemical Society·Emily J McLaurinDaniel R Gamelin

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Citations

Sep 3, 2016·Chemical Reviews·Lihong JingMingyuan Gao

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