Insoluble Quantum Dots (QDs)

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Insoluble quantum dots (QDs) are a class of semiconductor nanomaterials with exceptional optical and electronic properties. Unlike their water- or alcohol-soluble counterparts, insoluble QDs are specifically designed for applications that require stable solid-state materials and reliable integration into films, coatings, or composite matrices. Their unique size-dependent fluorescence, narrow emission spectra, and high photostability make them suitable for optoelectronic devices, solid-state lighting, displays, and advanced photonics. By carefully controlling the composition, size, and surface characteristics, insoluble QDs can achieve precise emission tuning across the visible and near-infrared spectrum.

Structural Design and Surface Engineering

The performance of insoluble QDs largely depends on their core–shell structure and surface treatment. Core materials serve as the primary light-emitting centers, while shell layers enhance chemical stability and reduce surface defects by passivating the nanocrystal surface. This structural design improves photoluminescence quantum yield, narrows the emission peak, and minimizes photobleaching. In addition, surface treatments such as ligand engineering, silica coating, or polymer encapsulation further enhance stability and compatibility with solid matrices, helping to prevent aggregation and environmental degradation. As a result, insoluble QDs can maintain consistent optical performance even under demanding conditions, which is critical for device fabrication and long-term applications.

Our Products

Alfa Chemistry provides several types of insoluble quantum dots to meet different research and application needs. Our products mainly include:

Insoluble CdSe/ZnS QDs

Our insoluble CdSe/ZnS QDs feature a CdSe core, a ZnCdSeS intermediate layer, and a ZnS outer shell, with an additional silica coating on the surface. This multi-shell configuration ensures high structural integrity and excellent photoluminescence efficiency. These QDs emit bright, stable fluorescence under excitation, making them ideal for solid-state lighting, LEDs, and high-resolution display technologies.

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Insoluble ZnCdS/ZnS QDs

The insoluble ZnCdS/ZnS QDs are designed with a ZnCdS core and a ZnS shell, providing tunable emission across the visible spectrum. The robust core-shell design reduces lattice mismatch and enhances stability, resulting in narrow emission peaks and minimal spectral shift over time. These QDs are particularly suitable for applications in color conversion films, backlighting, and photodetectors.

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Insoluble Perovskite QDs

Our insoluble perovskite QDs are based on CsPbX3 (X = Cl, Br, I) nanocrystals, where halide composition determines the emission wavelength. The perovskite structure offers exceptional color purity, high quantum yield, and wide tunability across the visible spectrum. By adjusting the halide ratios, these QDs can achieve precise color rendering for displays and lighting applications. Their strong luminescence and flexible spectral tuning make them promising materials for next-generation display and photonic technologies.

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Choose Alfa Chemistry

Alfa Chemistry is committed to providing high-quality insoluble quantum dots to support a wide range of research and industrial applications. These products are carefully engineered to deliver reliable optical performance, excellent structural stability, and tunable emission properties across a wide spectral range. In addition to our standard product offerings, we also provide customized solutions to accommodate specific research goals or application requirements. If you would like more information about our products, please feel free to contact us at any time.

※ Please kindly note that our products and services are for research use only.

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