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Article Dans Une Revue Journal of Physical Chemistry C Année : 2014

Yb3+ ions distribution in YAG nanoceramics analyzed by both optical and TEM-EDX techniques

G. Boulon
Y. Guyot
M. Guzik
  • Fonction : Auteur
P. Gluchowski
  • Fonction : Auteur
D. Hreniak
  • Fonction : Auteur
W. Strek
  • Fonction : Auteur

Résumé

We show the approach in the structural and spectroscopic analysis of Yb3+-doped YAG nanoceramics prepared using the low temperature-high pressure sintering technique (LTHP) by conjugation of both TEM-EDX and optical techniques. Pressure sintering dependences of absorption, emission, and decays are analyzed and interpreted. The sample pressurized at 8 GPa for sintering is characterized by the highest transparency and confirms the Y3Al 5O12 garnet structure of the grains of ∼21 nm average size. Yb3+ ion distribution has been analyzed by both TEM-EDX evaluation in grains and grain boundaries and spectroscopy of Yb3+ pairs of small population from the co-operative luminescence phenomenon. EDX analysis at the TEM scale provides unambiguous results on a clear tendency of almost uniform Yb3+ distribution. An important new observation has been made at 4 K and room temperature with the 2F7/2 → 2F5/2 0-phonon absorption line located at 975.7 nm, in addition of the 0-phonon line of the YAG structure of grains at 968 nm similar to that of bulky YAG single crystals. We have discussed the origin of this new 0-phonon line relaxing only by nonradiative transitions and conclude that this line might be assigned to Yb3+ distorted sites on the grain surfaces. © 2014 American Chemical Society.
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Dates et versions

hal-01808054 , version 1 (05-06-2018)

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Citer

G. Boulon, Y. Guyot, M. Guzik, T. Epicier, P. Gluchowski, et al.. Yb3+ ions distribution in YAG nanoceramics analyzed by both optical and TEM-EDX techniques. Journal of Physical Chemistry C, 2014, 118 (28), pp.15474-15486. ⟨10.1021/jp502882j⟩. ⟨hal-01808054⟩
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