Fabrication of near-infrared-emitting CdSeTe/ZnS core/shell quantum dots and their electrogenerated chemiluminescence

Liang, Guang Chuan; Li, Fulin; Liu, Hong Yin; Zhang, Jian Rong; Burda, Clemens; Zhu, Jun

doi:10.1039/c000564a

Cited by 96 publications

(66 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[22] At GSH concentrations above 2.0 mm, the ECL peak potential increases dramatically; this indicates that HMP binding site can be efficiently replaced by CdÀS bonds at a high mole ratio of GSH to NCs. This phenomenon not only firmly supports the proposed LOP ECL strategy, but also explains the high ECL-trigging energies required for NIR-emitting CdTeSe/ZnS [10] and CdTe/CdS/ZnS NCs. [11] In conclusion, we provide a strategy for NIR ECL of NCs at LOPs by using dual-stabilizer-capped NIR-emitting CdTe NCs as ECL emitters and TPrA as the coreactant.…”

supporting

confidence: 66%

“…Because wide-band-gap shells, such as ZnS or CdS shells, can provide a physical barrier between the optically active core and the surrounding medium and make NCs less sensitive to environmental changes, [10] we deduce that the wide-band-gap shells of NIR-emitting NCs also lead to higher electrochemical energies for ECL emission. [10,11] As both PL and ECL are very sensitive to the surface states of NCs, [2,12] herein a strategy for low-oxidation-potential (LOP) ECL from NIR-emitting CdTe NCs is proposed by exploiting the surface chemistry of CdTe NCs as well as ECL coreactants. First, dual-stabilizer-capped NIR-emitting CdTe NCs were chosen as ECL emitters.…”

mentioning

confidence: 97%

“…[6][7][8] With the advances of the synthetic strategies of NIR-emitting NCs, these NCs have emerged as good candidates to complement visible-light-emitting ECL emitters. [9][10][11] However, higher ECL-trigging energies for NIR-emitting NCs [9][10][11] are often accompanied by undesirable electrochemical interference, and the limited efficiency [9] also hinders possible applications.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Efficient Near‐Infrared Electrochemiluminescence from CdTe Nanocrystals with Low Triggering Potential and Ultrasensitive Sensing Ability

Liang

Shen

Zou

et al. 2011

Chemistry A European J

View full text Add to dashboard Cite

supporting

confidence: 66%

mentioning

confidence: 97%

mentioning

confidence: 99%

See 1 more Smart Citation

Efficient Near‐Infrared Electrochemiluminescence from CdTe Nanocrystals with Low Triggering Potential and Ultrasensitive Sensing Ability

Liang

Shen

Zou

et al. 2011

Chemistry A European J

View full text Add to dashboard Cite

“…In this respect, nanostructured materials with tuneable morphology have attracted exceptional interest over the past decades because of their unique architectures, tailored physicochemical properties, central roles in fabricating nanoelectronics, and potential applications in bionanotechnology. [1][2][3][4][5][6][7][8] Recently, great efforts have been devoted to bottomup self-assembled nanostructures. Self-assembly is the fundamental phenomenon that generates structural organization on all scales in vivo and in vitro.…”

Section: Introductionmentioning

confidence: 99%

Ligand Exchange Dynamics and Temperature Effects upon Formation of Nanocomposites Based on Semiconductor CdSе/ZnS Quantum Dots and Porphyrins: Ensemble and Single Object Measurements

Zenkevich¹,

Blaudeck²,

Kowerko³

et al. 2012

MHC

View full text Add to dashboard Cite

Dye molecules with pyridyl side substituents (porphyrins and heterocyclic perylene diimides) coordinatively attached to semiconductor CdSe/ZnS quantum dots (QDs) surface form quasi-stable "QD-Dye" nanocomposites of various geometry in the competition with capping molecules (tri-n-octyl phosphine oxide or long chain amines) exchange. This results in photoluminescence (PL) quenching of the QDs both due to Foerster resonance energy transfer and formation of non-radiative surface states. QD surface is inhomogeneous with respect to the involved attachment and detachment processes. The formation of "QD-Porphyrin" nanocomposites is realized at least two time scales (60 and 600 s), which is attributed to a reorganisation of tri-n-octylphosphine oxide capping shell. In a low temperature range of 220÷240 K related changes in QD absorption and emission reveal a phase transition of the capping shell (tri-n-octyl phosphine oxide and amine). In "QD-Dye" nanocomposites, this phase transition is enhanced considerably by only a few attached

show abstract

“…It is worth mentioning that other QDs (not lead based) have problems. For example, the emission bands from CdSeTe/ZnS, 17 CdTe/CdS, 18 CdSeTe/CdS, 19 CdSeTe, 20 and ZnS/CdS 21,22 QDs are not sufficiently far enough into the infrared region (∼800-850 nm) for them to have been considered for investigation herein.…”

mentioning

confidence: 99%

ZnCdS:Cu,Al,Cl: A Near Infra-Red Emissive Family of Phosphors for Marking, Coding, and Identification

Silver

Marsh

Fern

et al. 2017

ECS J. Solid State Sci. Technol.

View full text Add to dashboard Cite

Zn 1-x Cd x :Cu 0.03% ,Cl (where x = 0.5-0.9) infrared emitting phosphors have been synthesized by an aqueous thermal decomposition method. The aim was to developing infrared emitting phosphors for coding, marking, and identification applications. The phosphors were characterized by, X-ray powder diffraction, scanning electron microscopy and photoluminescence spectroscopy. The emission band at 1000 nm was sufficiently far into the infrared region that visible emission was minimized. Co-doping Zn 1-x Cd x S:Cu 0.03% with Al 3+ increased the infrared emission intensity to over twice that of the equivalent Zn 0.3 Cd 0.7 S:Cu 0.03% phosphor (with no Al 3+ ion co-doping), with the highest intensity being found for the phosphor composition Zn 0.1 Cd 0.9 S:Cu 0.03%, Al 0.03% . It is shown herein that the inclusion of Al 3+ into the phosphors causes the formation of cells with smaller cell volume, and it is suggested that this is the prerequisite for the improved photoluminescent properties. Finally we have shown herein that these infrared emitting powder phosphors are thus able to meet marking and coding requirements, especially in low light and poor visibility. Although the uses of phosphors are widespread in modern technologies and they are common in the display and lighting industries where products find applications in both domestic and commercial applications, their use in other areas is less widely appreciated. Such uses include:-on postage stamps to help letter sorting, on currency and bank notes for secrecy/authenticity, thermometry, luminescent paints and glow in the dark toys. In addition there are a number of military applications.Recently the wide availability of near-ultraviolet light and visible light emitting diodes (LEDs) and laser diodes in addition to infrared emitting systems has made the remote excitation of infrared emitting phosphors a practical possibility. Infrared emitting powder phosphors have the potential to meet marking and coding requirements, especially in low light and poor visibility.The advantages of IR emitting powder phosphors are:-1) That they can be easily deposited by conventional techniques to form large areas, if required, either by simple settling techniques, or by inclusion in a binder suitable for screen or ink-jet printing (the binder of course must be transparent over the required spectral range). 2) Such deposited powder layers, depending on their thickness and particle size and particle morphology etc., can be used in a transmission or a reflective mode with suitable UV or visible excitation sources.The ease of fabrication and the wide excitation spectra of the phosphors as well as their efficiencies facilitate a wide range of potential applications, including the following as preliminary examples: a) For use in coding/marking systems as simple IR sensitive markers. b) For improved marking/detection in conjunction with night vision systems.The origins of the green luminescence in ZnS:Cu phosphors (where Cu is introduced as a dopant into the ZnS lattice) has been attribute...

show abstract

Fabrication of near-infrared-emitting CdSeTe/ZnS core/shell quantum dots and their electrogenerated chemiluminescence

Abstract: New water-soluble CdSeTe/ZnS core-shell quantum dots with excellent near-infrared emission were synthesized via an aqueous solution method; they showed strong electrogenerated chemiluminescence and favorable biocompatibility.

Cited by 96 publications

References 34 publications

Efficient Near‐Infrared Electrochemiluminescence from CdTe Nanocrystals with Low Triggering Potential and Ultrasensitive Sensing Ability

Efficient Near‐Infrared Electrochemiluminescence from CdTe Nanocrystals with Low Triggering Potential and Ultrasensitive Sensing Ability

Ligand Exchange Dynamics and Temperature Effects upon Formation of Nanocomposites Based on Semiconductor CdSе/ZnS Quantum Dots and Porphyrins: Ensemble and Single Object Measurements

ZnCdS:Cu,Al,Cl: A Near Infra-Red Emissive Family of Phosphors for Marking, Coding, and Identification

Contact Info

Product

Resources

About