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Cadmium selenide (CdSe) is a binary, primarily ionic compound with a touch of covalent character. It can take three crystalline forms, but the hexagonal wurtzite structure shown is by far the most common. The unit cell is shown in the image; the gray balls are cadmium, and the yellow balls are selenium.

In 1879, French chemist M. J. Margottet prepared CdSe by heating elemental cadmium in a current of hydrogen selenide (H₂Se), then subliming the product in a hydrogen atmosphere. Since then it also has been produced by treating cadmium chloride or sulfate with H₂Se. Now, in the age of nanotechnology, CdSe is made by the reaction of cadmium oxide and elemental selenium in a trialkylphosphine solvent.

CdSe is an n-type semiconductor, which makes it ideal for nanotech applications. Its nanoparticles are especially useful as a component of photocatalysts. In 2016, Philip Kalisman, Yifat Nakibli, and Lilac Amirav* at the Technion–Israel Institute of Technology (Haifa) showed that water splitting via visible-light irradiation with platinum-tipped CdSe@CdS nanorods, . The authors “believe that this approach . . . will enable us to tackle the remaining challenges with an eye toward overall water splitting.�

Then this year, Wenfa Xie, Hanzhuang Zhang, and colleagues at Jilin University (Changchun, China) used a spray process to make CdSe-containing quantum-dot light-emitting diodes (QLEDs) These QLEDs are . The authors believe that their results “will spur the progress toward realization of high performance and mass production of all-inorganic QLEDs as a platform for QD-based full-color displays.�

We present CdSe to commemorate , October 9th.