Lasing in self-assembled microcavities of CdSe/CdS core/shell colloidal quantum rods.

Nanoscale
Margherita Zavelani-RossiGuglielmo Lanzani

Abstract

Colloidal semiconductor quantum rods have demonstrated many advantageous properties as light emitters such as high quantum yield, tunable emission wavelength, and polarized emission. This makes them an interesting optical gain material for laser applications. We report room-temperature gain lifetimes in core/shell CdSe/CdS quantum rods exceeding 300 ps, and show that the long gain lifetimes result from the significant reduction of Auger recombination in our quantum rods, even though the electrons are delocalized over the rod volume. We also fabricate devices by deposition of small droplets of quantum rod solution onto flat substrates. The evaporation dynamics of the droplets are governed by the coffee stain effect which leads to the formation of well defined micron-size stripes. These stripes consist of densely packed, laterally aligned quantum rods and provide optical feedback originating from the abrupt changes of refractive index at the stripe borders. We exploit the optical gain and the coffee stain mediated self-assembly and show that we can fabricate novel microlasers solely by deposition of droplets of quantum rod solutions on flat substrates.

References

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Citations

Aug 27, 2013·Nature Communications·Christos GrivasPavlos Lagoudakis
Apr 24, 2012·Physical Chemistry Chemical Physics : PCCP·Maria Grazia LupoFrancesco Tassone
Jul 12, 2013·Physical Chemistry Chemical Physics : PCCP·Yile LiaoYinthai Chan
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Oct 23, 2014·Small·Francesco Di StasioRoman Krahne
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Nov 3, 2016·Journal of the American Chemical Society·Eva BladtSara Bals
Jan 17, 2017·Nano Letters·Andrew D La CroixJanet E Macdonald
Mar 31, 2017·ACS Applied Materials & Interfaces·Lei ZhangJiayu Zhang
Aug 17, 2020·Nanoscale·Dmitry PorotnikovMikhail Zamkov
Jul 28, 2017·Nature Communications·Zhili YangEdo Waks
Dec 29, 2017·Nano Letters·Boris le FeberDavid J Norris
Dec 16, 2016·The Journal of Physical Chemistry Letters·Chen LiaoJiayu Zhang
Jun 9, 2020·The Journal of Physical Chemistry Letters·Junzi LiTingchao He
Aug 14, 2020·The Journal of Physical Chemistry Letters·Rulin LiuXi Zhu
Dec 13, 2018·ACS Nano·Federico MontanarellaDaniel Vanmaekelbergh

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