In order to fabricate a high-power laser medium using Eu(III) complex, strong-luminescent Eu(III) complexes with low vibrational ligands were synthesized. One of the Eu(III) complex showed remarkably sharp red emission and large stimulated emission cross-section. The value of stimulated emission cross-section was the same order as the values of Nd-glass laser for practical use. (C) 2004 Elsevier B.V. All rights reserved.