Enhanced luminescence in Eu-doped ZnO nanocrystalline films
We found an enhancement of Eu3+ emissions in Eu-doped ZnO nanocrystalline films fabricated by microemulsion method. The Eu3+ emission intensities were increased by reducing annealing temperatures from 633 K to 533 K. One possible explanation for this phenomenon is that the size reduction enhances th...
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Veröffentlicht in: | Applied physics letters 2015-07, Vol.107 (3) |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | We found an enhancement of Eu3+ emissions in Eu-doped ZnO nanocrystalline films fabricated by microemulsion method. The Eu3+ emission intensities were increased by reducing annealing temperatures from 633 K to 533 K. One possible explanation for this phenomenon is that the size reduction enhances the energy transfer from ZnO nanoparticles to Eu3+ ions. Also, the shift of the charge-transfer band into the low-energy side of the absorption edge is found to be crucial, which seems to expedite the energy transfer from O atoms to Eu3+ ions. These findings will be useful for the material design of Eu-doped ZnO phosphors. |
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ISSN: | 0003-6951 1077-3118 |
DOI: | 10.1063/1.4926986 |