Abstract
AbstractFour pyrotechnic compositions containing copper or its compounds and different halogens were tailored to produce the emitters copper(I) fluoride, CuF, copper(I) chloride, CuCl, copper(I) bromide, CuBr, and copper(I) iodide, CuI. The UV/Vis emission spectra of these compositions were measured and allow for the identification and assignment of the above species CuF, CuCl, CuBr, and CuI. Copper(I) fluoride is a poor emitter with a very narrow green band centered at λ=493 nm only. In contrast all the other copper(I) monohalides have extended band systems with boundaries ranging from about λ=400 to 540 nm. CuCl yields a blue chemiluminescence, whereas CuBr surprisingly gives a highly saturated (Σ=95 %) intense blue violet (λd=459 nm) emission. CuI displays an overall bluish green emission only due to more intense band systems λ>500 nm. The spectral properties of all the emitters and the color values of the emitters in the 1931‐CIE color diagram are presented.
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