Correlation of structural properties with energy transfer of Eu-doped ZnO thin films prepared by sol-gel process and magnetron reactive sputtering.

Journal of Applied Physics
Julien PetersenAziz Dinia

Abstract

We investigated the structural and optical properties of Eu-doped ZnO thin films made by sol-gel technique and magnetron reactive sputtering on Si (100) substrate. The films elaborated by sol-gel process are polycrystalline while the films made by sputtering show a strongly textured growth along the c-axis. X-ray diffraction patterns and transmission electron microscopy analysis show that all samples are free of spurious phases. The presence of Eu(2+) and Eu(3+) into the ZnO matrix has been confirmed by x-ray photoemission spectroscopy. This means that a small fraction of Europium substitutes Zn(2+) as Eu(2+) into the ZnO matrix; the rest of Eu being in the trivalent state. This is probably due to the formation of Eu(2)O(3) oxide at the surface of ZnO particles. This is at the origin of the strong photoluminescence band observed at 2 eV, which is characteristic of the (5)D(0)-->(7)F(2) Eu(3+) transition. In addition the photoluminescence excitonic spectra showed efficient energy transfer from the ZnO matrix to the Eu(3+) ion, which is qualitatively similar for both films although the sputtered films have a better structural quality compared to the sol-gel process grown films.

References

Apr 15, 1995·Physical Review. B, Condensed Matter·E J ChoT Kasuya
Mar 31, 2004·Journal of Colloid and Interface Science·R BazziO Tillement
Feb 10, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Gao-Ren LiYe-Xiang Tong

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Methods Mentioned

BETA
x-ray
transmission electron microscopy
scanning electron microscopy
electron diffraction

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