Yb3+ and Yb3+-Eu3+ luminescent properties of the Li2Lu5O4(BO3)3 phase

Veronique Jubera (1) , Alain Garcia (1) , Jean-Pierre Chaminade (1) , François Guillen (1) , Jean Sablayrolles (1) , Claude Fouassier (1)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

The luminescence of Yb3+ in the oxyborate Li2Lu5O4(BO3)3 is reported. At low temperature, in addition to the usual ytterbium infrared emission, this phosphor presents an emission in the ultraviolet (lmax = 345 nm) which corresponds to the transition from the charge transfer state (O–Yb) to the 4f levels of Yb3+. The temperature quenching Tq50% is equal to 120 K. The infrared emission studied at room temperature is located between 950 and 1100 nm. Europium emission quenching in the Li2Yb5O4(BO3)3 phase is related to Eu→Yb transfer by cross-relaxation. The reverse Yb→Eu transfer by cooperative sensitization is highlighted in the codoped Li2Lu5O4(BO3)3 compound.

Mots clés: Oxyborate; Luminescence; Ytterbium; Europium; Cooperative sensitization

Domaines: Matériaux

Veronique Jubera, Alain Garcia, Jean-Pierre Chaminade, François Guillen, Jean Sablayrolles, et al.. Yb3+ and Yb3+-Eu3+ luminescent properties of the Li2Lu5O4(BO3)3 phase. Journal of Luminescence, 2007, 124 (1), pp.10-14. ⟨10.1016/j.jlumin.2006.01.355⟩. ⟨hal-00120274⟩