Structure, morphology and optical-luminescence investigations of spinel ZnGa2O4 ceramics co-doped with Mn2+ and Eu3+ ions
| Autor: | K. Szmuc, O. Zaremba, Ya. Shpotyuk, O. Kravets, Oleh Shpotyuk, Jozef Cebulski, Adam Ingram, Andriy Luchechko |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Photoluminescence Band gap Materials Science (miscellaneous) Spinel Analytical chemistry 02 engineering and technology Cell Biology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics 0104 chemical sciences Ion Condensed Matter::Materials Science engineering Crystallite Emission spectrum Electrical and Electronic Engineering Physical and Theoretical Chemistry 0210 nano-technology Luminescence Spectroscopy Biotechnology |
| Zdroj: | Applied Nanoscience. 9:907-915 |
| ISSN: | 2190-5517 2190-5509 |
| DOI: | 10.1007/s13204-018-0681-4 |
| Popis: | The polycrystalline zinc gallate ZnGa2O4: Mn2+ and ZnGa2O4: Mn2+, Eu3+ samples have been synthesized via high-temperature solid-state reaction ceramic technique. The obtained ceramics have been characterized employing the methods of X-ray diffraction analysis, transmission electron microscopy, energy-dispersive X-ray spectroscopy, positron annihilation lifetime spectroscopy and optical-luminescent spectroscopy. The XRD analysis testified in favor of successful formation of spinel structure in the prepared samples with small amount of additional phase observed in the ZnGa2O4: Mn2+, Eu3+ ceramics. The grains of irregular shape with a homogeneous distribution of Eu3+ ions in a volume were identified with TEM technique. The band gap of ZnGa2O4: Mn2+ spinel was estimated from optical absorption spectra in UV–Vis range. The characteristic bands related to electronic transitions of Mn2+ and Eu3+ ions were found in optical absorption and excitation spectra. The photoluminescence emission spectra exhibited matrix luminescence along with emission band of Mn2+ ions and narrow lines of Eu3+ ions in blue, green and red spectral region, respectively. The intensity ratio of Eu3+ emission lines confirms the high asymmetry around Eu3+ ions. These findings correlate well with results of positron annihilation lifetime spectroscopy showing intense reduction of positron trapping rate deeply in ceramics grains due to Eu3+ ions penetration. |
| Databáze: | OpenAIRE |
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