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<p>In vivo Comparison of the Biodistribution and Toxicity of InP/ZnS Quantum Dots with Different Surface Modifications</p>
摘要： In vivo Comparison of the Biodistribution and Toxicity of InP/ZnS Quantum Dots with Different Surface Modifications
关键词： in vivo,surface chemistry,nanotoxicology,biodistribution,InP/ZnS quantum dots
更新于2025-09-23 15:19:57
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Ultrafast Charge Carrier Dynamics and Nonlinear Optical Absorption of InP/ZnS Core-Shell Colloidal Quantum Dots
摘要： Understanding of ultrafast carrier dynamics in InP/ZnS colloidal quantum dots (QDs) is essential for their optoelectronic applications. In this paper, we have successfully fabricated high-quality InP/ZnS core-shell QDs with quantum yield (QY) of 47%. Time resolved photoluminescence (TRPL), femtosecond transient absorption (TAS) measurements were performed to characterize the carrier injection, relax and transition process in the InP/ZnS QDs. It is found that the photoexcited carrier first injected to ZnS shell in 2 ps, then relaxed to alloyed layer between ZnS shell and InP core in 7.4 ps, next relaxed to different energy levels in InP core in about 170 ps, finally recombined by charged and neutral excitons transition in 4.1 ns and 26.7 ns, respectively. Additionally, the two-photon absorption (TPA) coefficient obtained from Z-scan measurement indicates that InP/ZnS QDs possess good nonlinearly optical properties. Our research is significant for the improvement and engineering of InP/ZnS QDs based materials for optoelectronic applications.
关键词： quantum dots,InP/ZnS,ultrafast carrier dynamics,nonlinear optical absorption,optoelectronic applications
更新于2025-09-19 17:13:59
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Evaluation for adverse effects of InP/ZnS quantum dots on the in vitro cultured oocytes of mice
摘要： So far, cadmium-containing quantum dots (QDs), such as cadmium telluride (CdTe), have been known for causing time- and dose-dependent toxicity for cells, tissues or organs in living organisms. Yet, there has been no a unified conclusion whether indium phosphide (InP) QDs, a kind of non-cadmium QDs, have the same effects on these structures, especially on female germ cells. In this work, we evaluated the adverse effects of InP/ZnS based core/shell QDs on oocytes of the Kunming mice. The immature oocytes were co-cultured with InP/ZnS QDs at concentrations of 0, 0.2 μg/mL, 2 μg/mL, and 20 μg/mL for 16 hours, respectively. The statistics of morphology showed that InP/ZnS QDs significantly (P<0.05) affected the maturation rate of oocytes at concentrations above 2 μg/mL, while measurements of diameter didn’t seem to display difference between the groups. Fluorescence images showed that the uptakes of QDs by granulosa cells increased with the increasing concentration, but no fluorescence signal of QDs was detected inside the oocytes. The abnormality rate of both spindles and chromosomes in control group was the same as that in experimental groups. However, two hormone levels were both disturbed by InP/ZnS QDs. These results indicated that InP/ZnS QDs decreased the oocytes maturation in a dose-dependent manner by changing the culture environment, which was similar to the effects of cadmium-containing QDs. This study provides the reproductive toxicology data of InP/ZnS QDs, which is useful for biomedical safe application of QDs in future.
关键词： quantum dots,InP/ZnS,oocytes,adverse effects,in vitro
更新于2025-09-16 10:30:52
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Synthesis of Colloidal Blue-Emitting InP/ZnS Core/Shell Quantum Dots with the Assistance of Copper Cations
摘要： Colloidal InP quantum dots (QDs) have been considered as one of the most promising candidates for the applications in display and bio-label due to intrinsic toxicity-free and high photoluminescence. On account of the uncontrollable nucleation and growth for the synthesis of InP, it remains a challenge to obtain high-quality blue-emitting InP QDs with uniform size distribution. Herein, we employ a novel synthetic approach for producing blue-emitting InP/ZnS core/shell QDs with the assistance of copper cations. The studies reveal that the copper ions could combine with phosphorus precursor to form hexagonal Cu3-xP nanocrystals, which competed with the nucleation process of InP QDs, resulting in the smaller sized InP QDs with blue photoluminescence emission. After the passivation of InP QDs with ZnS shell, the synthesized InP/ZnS core/shell QDs present bright blue emission (~425 nm) with photoluminescence quantum yield (PLQY) of ~25%, which is the shortest wavelength emission for InP QDs till now. This research provides a new way to synthesize ultra-small semiconductor nanocrystals.
关键词： InP/ZnS core/shell,blue-emitting,Colloidal InP quantum dots,photoluminescence quantum yield,copper cations
更新于2025-09-12 10:27:22
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Energy level tuning of InP/ZnS nanocrystals by electronically delocalized dithiocarbamate derivatives
摘要： The nanocrystals have characteristics of varying the energy gap between the valence band and the conduction band depending on the size, and are attracting attention as light emitting materials due to the excellent in light stability. Since the bandgap of nanocrystals is determined by the size, it is very important to control the size of the nanocrystals in order to realize the red, green and blue primary color in a display. However, there are many difficulties in finely adjusting the nanocrystal bandgap to a size. In this study, the monodentate amine ligands coordinated on the surface of InP/ZnS nanocrystals are substituted with bidentate dithiocarbamate ligands having a strong coordination ability and electrically resonant structures, so that the nanocrystal can be finely tuned to control the emission spectrum. NMR analysis showed that some amine ligands on the surface of the nanocrystals were substituted with dithiocarbamate ligands. The PL spectra also show that the emission wavelength of the new nanocrystals is increased by about 20 nm (bathochromic shift), indicating that the active region of the exciton (an electron-hole pair) is extended to the delocalized dithiocarbamate ligands as well as the nanocrystals.
关键词： dithiocarbamate ligands,bathochromic shift,Nanocrystals,InP/ZnS
更新于2025-09-04 15:30:14