, ? Neodymium-doped silicon oxide thin films have been prepared by evaporation

, ? Silicon nanocrystals are generated in the films by annealing post-treatments

, ? Under indirect excitation, neodymium ions are sensitized by nanocrystals

, ? Below 100 K, the neodymium-related photoluminescence intensity saturates

, ? Saturation is explained by a decrease of the coupling efficiency with nanocrystals

A. Polman, J. Appl. Phys, vol.82, pp.1-39, 1997.

P. G. Kik, M. L. Brongersma, and A. Polman, Appl. Phys. Lett, vol.76, pp.2325-2327, 2000.

G. Franzò, D. Pacifici, V. Vinciguerra, F. Priolo, and F. Iacona, Appl. Phys. Lett, vol.76, pp.2167-2169, 2000.

M. Fujii, M. Yoshida, Y. Kansawa, S. Hayaski, and K. Yamamoto, Appl. Phys. Lett, vol.71, pp.1198-1200, 1997.

H. Rinnert, G. Adeola, and M. Vergnat, Appl. Phys. Lett, vol.105, p.36101, 2009.

S. Y. Seo, M. J. Kim, and J. Shin, Appl. Phys. Lett, vol.83, p.2778, 2003.

K. Watanabe, H. Tamaoka, M. Fujii, K. Moriwaki, and S. Hayashi, Physica E, vol.13, p.1038, 2002.

D. Bréard, F. Gourbilleau, A. Belarouci, C. Dufour, and R. Rizk, J. Lumin, vol.121, p.209, 2006.

A. N. Macdonald, A. Hryciw, F. Lenz, and A. Meldrum, Appl. Phys. Lett, vol.89, p.173132, 2006.

E. Steveler, H. Rinnert, and M. Vergnat, J. Appl. Phys, vol.110, p.113518, 2011.

A. G. Cullis, L. T. Canham, and P. D. Calcott, J. Appl. Phys, vol.82, p.909, 1997.

M. L. Brongersma, P. G. Kik, A. Polman, K. S. Min, and H. A. Atwater, Appl. Phys. Lett, vol.76, p.351, 2000.

Y. Kanemitsu, T. Ogawa, K. Shiraishi, and K. Takeda, Phys. Rev. B, vol.48, p.4883, 1993.

V. Vinciguerra, G. Franzò, F. Priolo, F. Iacona, and C. Spinella, J. Appl. Phys, vol.87, p.8165, 2000.

D. Kovalev, H. Heckler, G. Polisski, and F. Koch, Phys. Status Solidi (b), vol.215, p.871, 1999.

H. Rinnert, O. Jambois, and M. Vergnat, J. Appl. Phys, vol.106, p.23501, 2009.

A. M. Hartel, S. Gutsch, D. Hiller, and M. Zacharias, Phys. Rev. B, vol.85, p.165306, 2012.

H. Rinnert, M. Vergnat, and A. Burneau, J. Appl. Phys, vol.89, p.237, 2001.

E. Steveler, H. Rinnert, X. Devaux, M. Dossot, and M. Vergnat, Appl. Phys. Lett, vol.97, p.221902, 2010.

E. Steveler, H. Rinnert, and M. Vergnat, J. Lumin, vol.150, p.35, 2014.

L. Pavesi and M. Ceschini, Phys. Rev. B, vol.48, p.17625, 1993.

C. Delerue, G. Allan, C. Reynaud, O. Guillois, G. Ledoux et al., Phys. Rev. B, vol.73, p.235318, 2006.

P. D. Calcott, K. J. Nash, L. T. Canham, M. J. Kane, and D. Brumhead, J. Phys.: Condens. Matter, vol.5, p.91, 1993.

T. Förster, J. S. Kirby-smith, J. L. Magee, and M. Burton, Comparative effects of radiation, p.3133, 1960.