Cadmium Selenide

Cadmium selenide particles is a grey-brown or red crystalline or powdery substance with semiconductor properties, insoluble in water, high melting point, heat or acid will produce toxic hydrogen selenide gas, which can be used in electronic emitters, spectral analysis, light conductors, semiconductors, photosensitive components and so on.

Properties

Molecular formula: CdSe

Molecular weight: 191.37 g/mol

CAS No.: 1306-24-7

Appearance: grey-brown or red crystal or powder.

Density: 5.816 g/cm³ (solid, 15℃)

Melting point: 1268°C (1541K)

Solubility: insoluble in water, slightly soluble in ethanol, soluble in ammonia.

Crystal structure: Hexagonal fibrous zincite structure (wurtzite).

Stability: stable at room temperature, but should avoid contact with strong oxidising agents, strong acids and conditions such as heat and humid air, heat or acid can produce toxic hydrogen selenide gas.

Decomposition products: Decomposition by heat will produce selenium oxide.

Optical properties: As a semiconductor material, it has applications in the field of optoelectronics, and has unique optical properties under certain conditions, and can be used to manufacture infrared detectors, photosensitive elements, and so on.

Applications

Optoelectronic field:

Solar cells: Because of its high light absorption coefficient and adjustable band gap, cadmium selenide can be used as the absorber layer material of thin film solar cells, which helps to improve the efficiency of solar cells and reduce costs.

Light emitting diode (LED): Cadmium selenide semiconductor can produce high quality and narrow bandwidth light, which can be used to manufacture LEDs of different colours. by changing the size and composition of cadmium selenide nanoparticles, the colour of light emitted by LEDs can be adjusted, and it has the advantages of a wide colour gamut, high colour purity and low power consumption.

Laser: Its quantum dots have size-adjustable emission characteristics and can be used as gain medium for lasers to achieve low-threshold, tunable laser emission and narrow laser linewidth.

Photodetector: With high sensitivity to light, it is an excellent material for manufacturing photodetectors, which can be applied in various optoelectronic devices such as imaging sensors and infrared detectors to convert optical signals into electrical signals.

Infrared optical filters: specially treated and processed cadmium selenide materials can be used for infrared optical filters, filtering and selecting infrared light of specific wavelengths.

Biomedical field:

Bio-imaging: Cadmium selenide quantum dots have unique optical properties, such as high fluorescence intensity and good stability, etc. They can be used as fluorescent probes for bio-imaging, and used in imaging studies of cells, tissues and living animals, which can provide high-resolution image information and help scientists better understand the physiological and pathological processes in living organisms.

Drug delivery: Drugs can be combined with cadmium selenide quantum dots to construct drug delivery systems. The fluorescent properties of quantum dots can be used to track and monitor the drug delivery process in real time, improving the effectiveness and safety of drug therapy.

Biosensing: based on its specific recognition of biomolecules and changes in optical signals, it can be used in the construction of biosensors to detect a variety of biomarkers, pathogens and other substances in the organism, providing important information for the diagnosis and treatment of diseases.

Electronics field:

Field Effect Transistor (FET): can be used as the active layer of field effect transistor, field effect transistor is a key component in electronic devices such as integrated circuits and sensors, the application of cadmium selenide in field effect transistor helps to improve the performance of electronic devices.

Glass manufacturing: in glass manufacturing, cadmium selenide can be used as an additive to make the glass show specific colours, such as red and pink, to meet different decorative and functional needs.