研究目的
Investigating the efficiency and stability enhancement of CdSe/CdS quantum rods (QRs) by forming a CdSe/CdS/ZnS QRs-in-matrix assembly (QRAs) structure for optoelectronic applications.
研究成果
The study successfully developed a facile synthetic approach for the growth of a CdSe/CdS/ZnS QRs-in-matrix structure, which provides thick ZnS encapsulation that effectively confines the excitons in the QRs and improves the antioxidization ability of the QRs. The QRAs present a high quantum efficiency up to 85%, thermal quenching of only 7% at 100°C, and highly enhanced long-term photochemical stability.
研究不足
The practical application of CdSe/CdS and CdSe/CdS/ZnS QRs is still limited because of their relatively low quantum efficiency (QE) and stability compared to the 'giant' spherical CdSe/CdS/ZnS QDs.
1：Experimental Design and Method Selection
The study involved the synthesis of CdSe/CdS/ZnS QRAs by growing ZnS on CdSe/CdS QRs at a low ligand concentration. Structural and optical characterizations were performed to investigate the properties of the QRAs.
2：Sample Selection and Data Sources
Samples included CdSe QDs, CdSe/CdS QRs, and CdSe/CdS/ZnS QRAs. Data were acquired through various characterization techniques.
3：List of Experimental Equipment and Materials
Materials included cadmium oxide, selenium powder, cadmium stearate, octadecylphosphonic acid, hexylphosphonic acid, 1-octadecene, zinc diethyldithiocarbamate, hexyldecylamine, sulfur, trioctylphosphine, trioctylphosphine oxide, ethanol, dimethylbenzene, and silicone resin. Equipment included TEM, HAADF-STEM, SEM, FTIR-spectrometer, QEpro QY test system, and others.
4：Experimental Procedures and Operational Workflow
The synthesis involved several steps including the preparation of CdSe QDs, CdSe/CdS QRs, and CdSe/CdS/ZnS QRAs. Characterization techniques were applied to analyze the samples.
5：Data Analysis Methods
Data analysis involved steady-state and real-time photoluminescence characterizations, UV-Vis absorption spectra, and other spectroscopic methods.
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Silicone resin
Dow Corning-6662
Dow Corning
Used in the fabrication of WLEDs
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Cadmium oxide
325 mesh
Alfa Aesar
Used in the synthesis of CdSe QDs
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Selenium powder
325 mesh
Alfa Aesar
Used in the synthesis of CdSe QDs
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Cadmium stearate
Shanghai Debo Chemical Technology Co., Ltd.
Used in the synthesis of CdSe/CdS QRs
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Octadecylphosphonic acid
EPSILON CHIMIE
Used in the synthesis of CdSe QDs
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Hexylphosphonic acid
IRRITANT
Used in the synthesis of CdSe/CdS QRs
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1-Octadecene
TCI
Used as a solvent in the synthesis
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Zinc diethyldithiocarbamate
TCI
Used as a single source ZnS precursor
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Hexyldecylamine
TCI
Used in the synthesis of CdSe/CdS/ZnS QRAs
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Trioctylphosphine
TCI
Used in the synthesis of CdSe QDs
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Trioctylphosphine oxide
Shanghai Macklin Biochemical Co., Ltd.
Used in the synthesis of CdSe QDs
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Ethanol
AR
Tianjin Damao Chemical Reagent Co., Ltd.
Used for washing and purification
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Dimethylbenzene
AR
Tianjin Damao Chemical Reagent Co., Ltd.
Used for washing and purification
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Lu3Al5O12:Ce phosphor
Grirem Advanced Materials Co., Ltd.
Used in the fabrication of WLEDs
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