The difference photoluminescence emission peaks of CuO


Besides emissions in the visible or IR region, other authors announced emissions in the UV region. Santra et al. Observed the near band edge emission at 395 nm in the violet part. Aslani reported near-band edge emission at 300 nm. Maheshwari and Sathvamoorthy said several photoluminescence peaks at 325, 339, and 356 nm. They explained the difference in photoluminescence emission peaks of CuO as agreed with earlier reports by various sizes and shapes of CuO nanostructures. This fact indicates that the luminescence properties of CuO are strongly dependent on the morphology of the nanocrystals. Gizhevskiǐ et al. Studied the influence of temperatures and annealing time during sample preparation on the photoluminescence properties of CuO nanocrystals and reported three leading broad emission bands centered at about 305 nm (4.07 eV), 505 nm (2.46 eV), and 606 nm (2.05 eV). The 2nd band was attributed to band edge emission while the bar at 600 nm region was also assigned to defect-related states. The emission at the band edge contains several subpeaks due to the band edge emission from the new sublevels, which might arise by the interaction of two excitons or the 3D-1D splitting in Cu+ (3d9 4s2) at 300 K. PL intensities of the 305 nm (4.07 eV) band was seen to increase with the increasing temperature treatment and was explained by the enhancement of the crystallinity of the sample. If you are looking for high quality, high purity, and cost-effective copper oxide, or if you require the latest price, please email contact mis-asia.

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