The peculiarities of light absorption and light emission in Cu-doped Y-stabilized ZrO2 nanopowders
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The influence of doping with copper and annealing temperature on the characteristics of yttrium-stabilized ZrO2 nanopowders was investigated using photo- and cathodoluminescence as well as diffuse reflectance and electron paramagnetic resonance methods. After annealing at temperatures below 800 °С, both Cu-doped and Cu-free powders demonstrate light emission in the blue–red spectral range that are characteristic of the tetragonal ZrO2 phase. In the excitation spectra of blue–orange photoluminescence it was found a maximum in the range of light absorption by oxygen vacancies, indicating that the corresponding emitting centers are vacancy related complexes. A red luminescence band was found to be excited only by the light from band-to-band ZrO2 absorption. It was observed that the increase of annealing temperature up to 1000 °C stimulates the appearance of additional luminescence bands at ~ 510 and 580 nm correlated with the formation of monoclinic ZrO2 phase. The corresponding emitting center is considered to be a substitutional copper ion, the excitation of which can occur both via the capture of free carriers and via the energy transfer from oxygen vacancies.
KeywordsZirconium oxide Yttrium Copper Doping Luminescence Absorption Oxygen vacancy
This work was partly supported by the National Academy of Sciences of Ukraine (project III-4-16 and project III-41-17), by Ministry of Education and Science of Ukraine (Grant ID: 89452). The authors would like to thank also Dr. O. Gorban from O. O. Galkin Donetsk Institute for Physics and Engineering (NAS Ukraine) for the preparation of Cu-doped powders.
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