Abstract
Single crystals of LaMgAl11O19 (LMA) coactivated with Ce3+, Nd3+ or Ce3+, Cr3+, Nd3+, have been grown by the Verneuil (flame-fusion) method. In LMA:Ce, Nd the Ce → Nd energy transfer occurs both radiatively and non-radiatively. The efficiency of the non-radiative Ce → Nd transfer reaches ∼47%, as deduced from Ce3+ fluorescence lifetime measurements. In LMA:Ce, Cr, Nd, besides the Ce → Nd energy transfer, Ce → Cr and Cr → Nd transfers occur. The Ce → Cr energy transfer is highly efficient. This results from the good resonance between Ce emission and Cr absorption, and also from the short Ce-Cr distance compared to the longer Ce-Nd one.
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