Synthesis, morphology, and optical properties of CuI microcrystals

We have studied the effect of synthesis conditions on the luminescence spectra of ultrafine CuI powders. The results demonstrate that synthesis conditions (the reductant of Cu2+, the anion of the copper(II) salt, initial solution concentrations, and the presence of a stabilizer) influence the size and shape of the forming CuI particles and, accordingly, their luminescence spectrum. The highest luminescence intensity near λmax ≅720 nm (λex ≅ 370 nm) is offered by regularly shaped tetrahedral particles 1.1–1.2 μm in average size.