Cadmium Selenide (CdSe) is a II–VI semiconductor compound known for its tunable optical and electronic properties. When engineered at the nanoscale, CdSe forms quantum dots and nanocrystals that exhibit strong quantum confinement effects, enabling precise control over bandgap energies and emission wavelengths. These unique properties make CdSe a cornerstone material for photonics, optoelectronics, and biomedical imaging technologies.
Material Overview
CdSe typically crystallizes in either the cubic zinc blende or hexagonal wurtzite structure, with lattice constants around 6.05 Å and 4.30 Å, respectively. The material has a bulk bandgap of approximately 1.74 eV at room temperature, which can be tuned between 1.7–2.5 eV by varying the nanocrystal size. At the nanoscale, CdSe quantum dots display discrete electronic states that lead to size-dependent photoluminescence from red to blue wavelengths. Jiang et al. (2023) demonstrated that modifying surface defect chemistry in CdSe nanocrystals significantly alters emission intensity and lifetime, revealing that Cd2+ and Se2− defects govern carrier trapping and recombination mechanisms. Additionally, Singh et al. (2023) reviewed the extensive biomedical potential of CdSe quantum dots, including their use in targeted drug delivery, photothermal therapy, and tissue imaging, due to their stable luminescence and surface functionalizability. These findings underscore CdSe’s versatility as both an electronic and photonic material with adaptable surface chemistry.
Applications and Advantages
CdSe’s adjustable optical bandgap and high absorption coefficient make it a prime candidate for applications in light-emitting diodes (LEDs), laser diodes, solar cells, and quantum dot displays. In photonics, CdSe nanocrystals enable efficient light harvesting and emission tuning across the visible spectrum. Biomedically, CdSe quantum dots serve as fluorescent biomarkers and drug delivery agents, offering high signal-to-noise ratios and photostability under biological conditions. Pahwa and Ahmad (2024) highlighted environmentally sustainable methods for synthesizing CdSe nanoparticles using biogenic reduction routes with plant and microbial extracts, providing a safer and greener approach to nanoparticle fabrication. Moreover, pyrenyl-functionalized CdSe nanocrystals (Mongin et al., 2018) exhibit thermally activated delayed photoluminescence via triplet-triplet energy transfer, a promising mechanism for next-generation optoelectronic and photochemical devices.
Goodfellow Availability
Goodfellow supplies Cadmium Selenide (CdSe) in high-purity powder and crystal forms, suitable for research in semiconductor optics, nanostructure fabrication, and thin-film deposition. Custom particle sizes and purities are available to meet the requirements of photonic, biomedical, and energy-related applications.
Explore Cadmium Selenide CdSe – Material Information and other advanced materials in Goodfellow’s online catalogue: Goodfellow product finder.
References
- Jiang, R., Wu, H., Manzani, D., Zhang, W., & Liu, C. (2023). Effect of surface defects on photoluminescence properties of CdSe quantum dots in glasses. Applied Surface Science, 617, 156931. https://doi.org/10.1016/j.apsusc.2023.156931
- Singh, D. M., Thapa, S., Singh, K. R. B., Verma, R., Singh, R. P., & Singh, J. (2023). Cadmium selenide quantum dots and their biomedical applications. Materials Letters: X, 20, 100200. https://doi.org/10.1016/j.mlblux.2023.100200
- Mongin, C., Moroz, P., Zamkov, M., & Castellano, F. N. (2018). Thermally activated delayed photoluminescence from pyrenyl-functionalized CdSe quantum dots. Nature Chemistry, 10(3), 295–301. https://doi.org/10.1038/nchem.2906
- Pahwa, S., & Ahmad, M. (2024). Cadmium Selenide (CdSe) nanoparticles for use in light harvesting applications. Nucleation and Atmospheric Aerosols, 10.1063/5.0198369.