Multiple Dot-in-Rod PbS/CdS Heterostructures with High Photoluminescence Quantum Yield in the Near-Infrared

Justo, Yolanda; Goris, Bart; Kamal, John Sundar; Geiregat, Pieter; Bals, Sara; Hens, Zeger

doi:10.1021/ja300337d

Cited by 52 publications

(56 citation statements)

References 12 publications

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“…In contrast to the reaction presented here, in the exchange of PbE to CdE, the reaction occurs isotropically and core/ shell structures are prepared. 6,12,13,47 However, the reaction does proceed preferentially in the AE111ae direction with the formation of sharp (111) PbSe /(111) CdSe interfaces. 12 Here, the partial exchange reaction also shows sharp (111) boundaries between the two phases ( Figure 5c).…”

Section: Articlementioning

confidence: 99%

Preparation of Cd/Pb Chalcogenide Heterostructured Janus Particles via Controllable Cation Exchange

et al. 2015

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We developed a strategy for producing quasi-spherical nanocrystals of anisotropic heterostructures of Cd/Pb chalcogenides. The nanostructures are fabricated via a controlled cation exchange reaction where the Cd(2+) cation is exchanged for the Pb(2+) cation. The cation exchange reaction is thermally activated and can be controlled by adjusting the reaction temperature or time. We characterized the particles using TEM, XPS, PL, and absorption spectroscopy. With complete exchange, high quality Pb-chalcogenide quantum dots are produced. In addition to Cd(2+), we also find suitable conditions for the exchange of Zn(2+) cations for Pb(2+) cations. The cation exchange is anisotropic starting at one edge of the nanocrystals and proceeds along the ⟨111⟩ direction producing a sharp interface at a (111) crystallographic plane. Instead of spherical core/shell structures, we produced and studied quasi-spherical CdS/PbS and CdSe/PbSe Janus-type heterostructures. Nontrivial PL behavior was observed from the CdS(e)/PbS(e) heterostructures as the Pb:Cd ratio is increased.

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Section: Articlementioning

confidence: 99%

Preparation of Cd/Pb Chalcogenide Heterostructured Janus Particles via Controllable Cation Exchange

et al. 2015

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“…Another similar probe is the “multiple-dots-in-rod” composed of PbS/CdS, and it exhibits a quantum yield of 45 – 55%. 728 One other recent anisotropic option is a tadpole-shaped CdS-CdSe composite particle, which has a CdSe-rich head region and a CdS-rich tail. 729 In a follow-up paper, Pt and Pd particles were deposited onto these tadpole-shaped particles.…”

Section: Single Probe Trackingmentioning

confidence: 99%

Single Cell Optical Imaging and Spectroscopy

et al. 2013

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“…Most reports again focus on the CdSe/CdS system (CdSe dots in CdS rods [40,41]), though Justo et al have extended the synthesis to near IR emitting PbS dots embedded in CdS (and CdSe) nanorods by successive partial cation exchange steps with first Cu and then Pb ion treatments [42]. QDs in nanorods have a greatly increased absorption crosssection relative to the core QD and much larger Stokes shifts than the core in isolation.…”

Section: Development and Considerations From Earlier Work On Hgte Qdsmentioning

confidence: 99%

Infrared Emitting HgTe Quantum Dots and Their Waveguide and Optoelectronic Devices

Kershaw

Rogach

2014

Zeitschrift Für Physikalische Chemie

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Abstract:The development of the research into the synthesis and optoelectronic applications of HgTe and related quantum dots (QDs) is reviewed, from the early days when it was felt that it might be a useful replacement for rare earths in telecom optical amplifiers, through to its more recent and broader appeal as an IR photodetector technology. Appropriately the early investigation of the material sprang from a contact with Prof. Horst Weller and his group at Hamburg University. Though the problem of Auger recombination meant that it was not so easy to make telecom amplifiers and lasers as many had hoped, it has proved to have an extraordinarily broad bandgap tuning range and just recently this has resulted in the demonstration of photodetectors in the mid-to long-IR region operating at up to 12 μm wavelength. This impressive flexibility has led to interest in HgTe QDs and optoelectronic devices based on them to be as strong as ever and growing as the prospects for commercialization improve with every narrowing in the gap between the performance of present day epitaxial devices and QD-based technology. In a further satisfying and well timed twist, Prof. Weller's 60 th year has seen preliminary reports of extended gain lifetime in 'doped' HgTe QDs which may yet lead to a completing of the circle with the distinct possibility of electrically driven telecom wavelength lasers and amplifiers in the coming years. This review follows the development of the several synthetic methods to grow colloidal HgTe QDs, and their deployment in optoelectronic devices to the present.

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Multiple Dot-in-Rod PbS/CdS Heterostructures with High Photoluminescence Quantum Yield in the Near-Infrared

Cited by 52 publications

References 12 publications

Preparation of Cd/Pb Chalcogenide Heterostructured Janus Particles via Controllable Cation Exchange

Preparation of Cd/Pb Chalcogenide Heterostructured Janus Particles via Controllable Cation Exchange

Single Cell Optical Imaging and Spectroscopy

Infrared Emitting HgTe Quantum Dots and Their Waveguide and Optoelectronic Devices

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