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- Title
The peculiarities of light absorption and light emission in Cu-doped Y-stabilized ZrO<sub>2</sub> nanopowders.
- Authors
Korsunska, N.; Baran, M.; Papusha, V.; Lavoryk, S.; Marchylo, O.; Michailovska, K.; Melnichuk, L.; Melnichuk, O.; Khomenkova, L.
- Abstract
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.
- Subjects
LIGHT absorption; CATHODOLUMINESCENCE; ELECTRON paramagnetic resonance; EXCITATION spectrum; COPPER ions; ENERGY transfer
- Publication
Applied Nanoscience, 2019, Vol 9, Issue 5, p965
- ISSN
2190-5509
- Publication type
Article
- DOI
10.1007/s13204-018-0839-0