Combustion synthesis and up-conversion luminescence of La<sub>2</sub>O<sub>2</sub>S:Er<sup>3+</sup>,Yb<sup>3+</sup> nanophosphors - Université de Rennes Accéder directement au contenu
Article Dans Une Revue Journal of Solid State Chemistry Année : 2015

Combustion synthesis and up-conversion luminescence of La2O2S:Er3+,Yb3+ nanophosphors

Résumé

La2O2S:Er3+,Yb3+ nanocryst. up-​converting phosphors were synthesized by a combustion method at low temp., using ethanol as pre-​ignition fuel and thioacetamide as sulfurizing agent and org. fuel. The phosphors were characterized by powder X-​ray diffractometry, SEM, UV​/Vis​/NIR spectroscopy and fluorescence spectroscopy. Pure and well-​crystd. La2O2S:Er3+,Yb3+ nanoparticles, of the order of 50-​200 nm, are obtained after a post-​treatment in a H2S​/N2 flow for 2 h at 1000 °C. The efficient energy transfer from Yb3+ to Er3+ results in a strong up-​conversion upon excitation at 980 nm. The emission spectra show the intense green emissions corresponding to the (2H11​/2, 4S3​/2)​→4I15​/2 transitions and a red emission corresponding to the 4F9​/24I15​/2 transition. Addnl., within the investigated co-​doping concns., no significant concn. quenching effect and back energy transfer from Er3+ to Yb3+ were evidenced. This research highlights the influence of the sulfurization treatment on the purity​/crystallinity​/morphol. of the nanocrystals and the luminescence efficiency.

Domaines

Matériaux
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Dates et versions

hal-01131935 , version 1 (29-10-2015)

Identifiants

Citer

Noha Hakmeh, Christophe Chlique, Odile Merdrignac-Conanec, Bo Fan, François Cheviré, et al.. Combustion synthesis and up-conversion luminescence of La2O2S:Er3+,Yb3+ nanophosphors. Journal of Solid State Chemistry, 2015, 226, pp.255-261. ⟨10.1016/j.jssc.2015.02.015⟩. ⟨hal-01131935⟩
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