Optical properties of water-soluble l-cysteine-capped alloyed CdSeS quantum dot passivated with ZnSeTe and ZnSeTe/ZnS shells
Source abstract
Abstract
Abstract Alloyed quantum dots (QDs) passivated with shell materials have valuable optical characteristics suitable for a wide array of applications. In this work, alloyed ternary CdSeS QDs passivated with ZnSeTe and ZnSeTe/ZnS shells have been synthesized via a hot-injection method and a ligand exchange reaction employing l -cysteine as a thiol ligand has been used to obtain these water-soluble nanocrystals for the first time. The photoluminescence (PL) quantum yield (QY) of alloyed l -cysteine-capped CdSeS was 71.2% but decreased significantly to 5.2% upon passivation with a ZnSeTe shell. The red shift in PL emission of the CdSeS/ZnSeTe QDs was attributed to be strain-induced whilst a lattice-induced process likely created defect states in the core/shell interface hence contributing to the decline in the PL QY. Nonetheless, the fluorescence stability of CdSeS/ZnSeTe QDs in aqueous solution was unperturbed. Further passivation with a ZnS shell (CdSeS/ZnSeTe/ZnS) improved the PL QY to a value of 58.7% and thus indicates that the defect state in the QDs core/shell/shell structure was reduced. PL lifetime exciton measurements indicated that the rates of decay of the QDs influenced their photophysical properties.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Quantum Dots Synthesis And Properties · Chalcogenide Semiconductor Thin Films · Perovskite Materials and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (45)
Show source-provided references
1. CdSe nanocrystal based chem-/bio-sensors10.1039/b517613c ↗
2. Efficient near-infrared polymer nanocrystal light-emitting diodes10.1126/science.1068153 ↗
3. Passivated ZnSe nanocrystals prepared by hydrothermal methods and their optical properties10.1007/BF03353640 ↗
4. Nanoscale, near infrared broadband emission of In0.35Ga0.65As quantum dots on high index GaAs surfaces10.1039/c0nr00973c ↗
5. Quantum dot bioconjugates for imaging, labelling and sensing10.1038/nmat1390 ↗
6. Compact high-quality CdSe–CdS core–shell nanocrystals with narrow emission linewidths and suppressed blinking10.1038/nmat3539 ↗
7. Ligand replacement-induced fluorescence switch of quantum dots for ultrasensitive detection of organophosphorothioate pesticides10.1021/ac102531z ↗
8. Fabrication of fluorescence-based biosensors from functionalized CdSe and CdTe quantum dots for pesticide detection
9. Epitaxial growth of highly luminescent CdSe/CdS core/shell nanocrystals with photostability and electronic accessibility10.1021/ja970754m ↗
10. CdSe/CdS/ZnS and CdSe/ZnSe/ZnS core–shell–shell nanocrystals10.1021/jp046481g ↗
11. Design and synthesis of highly luminescent near-infrared-emitting water-soluble CdTe/CdSe/ZnS core/shell/shell quantum dots10.1021/ic9010949 ↗
12. Measurement of the radiative and nonradiative decay rates of single CdSe nanocrystals through a controlled modification of their spontaneous emission10.1103/PhysRevLett.93.107403 ↗
13. Type-II CdSe/CdTe/ZnTe (core–shell–shell) quantum dots with cascade band edges: the separation of electron (at CdSe) and hole (at ZnTe) by the CdTe layer10.1002/smll.200500227 ↗
14. Tuning the optical and electronic properties of colloidal nanocrystals by lattice strain10.1038/nnano.2008.360 ↗
15. Optical properties and exciton dynamics of alloyed core/shell/shell Cd1−xZnxSe/ZnSe/ZnS quantum dots10.1021/am303149r ↗
16. A facile route to synthesize CdZnSe core–shell-like alloyed quantum dots via cation exchange reaction in aqueous system10.1016/j.materresbull.2014.05.033 ↗
17. Aqueous synthesis of glutathione-capped ZnSe and Zn1–xCdxSe alloyed quantum dots10.1002/adma.200601939 ↗
18. Gradiently alloyed ZnxCd1−xS colloidal photoluminescent quantum dots synthesized via a noninjection one-pot approach10.1021/jp710852q ↗
19. Gram-scale one-pot synthesis of highly luminescent blue emitting Cd1−xZnxS/ZnS Nanocrystals10.1021/cm801201x ↗
20. Alloyed semiconductor quantum dots: tuning the optical properties without changing the particle size10.1021/ja035000o ↗
21. One-pot synthesis of homogeneous CdSexS1−x alloyed quantum dots with tunable composition in a green N-oleoylmorpholine solvent10.1002/pssa.201127552 ↗
22. Zhong · J. Phys. Chem. B · 2004 · 108 · 1555210.1021/jp048071y ↗
23. Embryonic nuclei-induced alloying process for the reproducible synthesis of blue-emitting ZnxCd1−xSe nanocrystals with long-time thermal stability in size distribution and emission wavelength10.1088/0957-4484/18/38/385606 ↗
24. Aqueous synthesis of glutathione-capped CdTe/CdS/ZnS and CdTe/CdSe/ZnS core/shell/shell nanocrystal heterostructures10.1021/la300515a ↗
25. Tunable luminescence of spherical CdSe/ZnS and tetrahedron CdSe/Cd1−xZnxS core/shell quantum dots created using same cores10.1016/j.matchemphys.2012.05.012 ↗
26. In situ synthesis of CdTe/CdSe core–shell quantum dots10.1021/cm070209c ↗
27. One-pot synthesis of highly luminescent CdSe/CdS core–shell nanocrystals via organometallic and “Greener” chemical approaches10.1021/jp0278364 ↗
28. Mismatched alloy nanowires for electronic structure tuning10.1063/1.3666223 ↗
29. Band anticrossing in GaInNAs alloys10.1103/PhysRevLett.82.1221 ↗
30. Microwave-assisted aqueous synthesis of small-sized, highly luminescent CdSeS/ZnS core/shell quantum dots for live cell imaging10.1002/ejic.201200030 ↗
31. Enhanced photostability from CdSe(S)/ZnO core/shell quantum dots and their use in biolabeling10.1002/ejic.201000790 ↗
32. Fluorescence quantum yields and their relation to lifetimes of rhodamine 6G and fluorescein in nine solvents: improved absolute standards for quantum yields10.1562/0031-8655(2002)075<0327:FQYATR>2.0.CO;2 ↗
33. Synthesis and structural, optical, and dynamic properties of core/shell/shell CdSe/ZnSe/ZnS quantum dots10.1021/jp3092013 ↗
34. 3-Mercaptobutyric acid as an effective capping agent for highly luminescent CdTe quantum dots: new insight into the selection of mercapto acids10.1021/jp302820u ↗
35. Quantum dots as versatile probes in medical sciences: synthesis, modification and properties10.1016/j.msec.2013.01.003 ↗
36. Synthesis of PbS/CdS core–shell QDs and their nonlinear optical properties10.1021/jp104311j ↗
37. Determining the concentration of CuInS2 quantum dots from the size-dependent molar extinction coefficient10.1021/cm300227b ↗
38. Luminescence and growth of CdTe quantum dots and clusters10.1039/b211953f ↗
39. Single-step synthesis to control the photoluminescence quantum yield and size dispersion of CdSe nanocrystals10.1021/jp027160c ↗
40. Spontaneous superlattice formation in nanorods through partial cation exchange10.1126/science.1142593 ↗
41. Bandgap modulation of carbon nanotubes by encapsulated metallofullerenes10.1038/4151005a ↗
42. Noninjection, one-pot synthesis of photoluminescent colloidal homogeneously alloyed CdSeS quantum dots10.1021/jp8110138 ↗
43. (CdSe)ZnS core–shell quantum dots: synthesis and characterization of a size series of highly luminescent nanocrystallites10.1021/jp971091y ↗
44. Surface-related emission in highly luminescent CdSe quantum dots10.1021/nl0342491 ↗
45. Femtosecond dynamics of CdTe quantum dots in water10.1016/j.jphotochem.2007.11.012 ↗