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CdS/ZnS core-shell type quantum dots oleic acid functionalized, fluorescence λem 450 nm, 5 mg/mL in toluene

Highly purified CdS/ZnS quantum dots with oleic acid surface ligand contain extremely low free organic ligands and impurities. They are well suited for display, solid state lighting, and solar cell applications. They can be used as electroluminescence emitter in quantum dots based LEDs or embedded in polymer matrix as the backlight of LCD display. CdSe/ZnS quantum dots in solid form can be dispersed in most non-polar organic solvents such as toluene, chloroform, and hexane..

CdS/ZnS core-shell type quantum dots
Product No. NRE-21005
Concentration 5mg/ml
Purity 99.9%
Formula CdS/ZnS
Florescence Λem 450nm
APS <10nm
Solvent Toluene
Quantum Yield 40-80%
FWHM <30nm
Form Liquid

CdS/ZnS core-shell type quantum dots

Introduction

Quantum dots (QDs) are nanoscale semiconductor particles that have attracted immense attention due to their unique optical and electronic properties. These materials are typically a few nanometers in size, and their behavior differs from bulk materials due to quantum confinement effects. When the size of a semiconductor particle is reduced to a nanometer scale, its electronic energy levels become quantized, leading to discrete energy levels and highly size-dependent optical properties such as fluorescence and absorption spectra. Quantum dots have found applications in a wide array of fields, including optoelectronics, biological imaging, and solar energy conversion.

One of the most important classes of quantum dots are core-shell quantum dots, which consist of a core material surrounded by an outer shell of another semiconductor material. This structure offers several advantages over core-only quantum dots, such as enhanced optical properties, better stability, and reduced toxicity. Among the many types of core-shell quantum dots, CdS/ZnS quantum dots are particularly notable due to the combination of cadmium sulfide (CdS) as the core material and zinc sulfide (ZnS) as the shell material.

Core and Shell Materials

CdS Core: Cadmium sulfide (CdS) is a widely studied material in the field of quantum dots due to its excellent optical properties. CdS quantum dots are known for their ability to emit light in the visible spectrum with high fluorescence efficiency. However, CdS quantum dots suffer from certain limitations, such as:

Surface defects that can trap charge carriers, leading to non-radiative recombination and reduced fluorescence.

Toxicity of cadmium ions, which can be released under certain conditions, making CdS quantum dots potentially hazardous in biological and environmental contexts.

ZnS Shell: Zinc sulfide (ZnS) is used as the shell material to address the limitations of the CdS core. ZnS has several key advantages:

 

 

 

 

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