Radiation rates and emission quantum yields of Eu(III) were modified using asymmetric deuterated Eu(Ill) complexes doped in poly(methyl methacrylate) (PMMA) deuterated tris-(hexafluoroacetylacetonato)europium-(III) with phospine oxide in order to produce lowthreshold levels for laser transmission and amplifier emissions. Geometric structures of asymmetric Eu(III) complexes were determined by single-crystal X-ray diffraction and Judd-Ofelt analysis. Luminescent polymers were fabricated by incorporating Eu(Ill) complexes in a PMMA matrix. Luminescent PMMA containing Eu(hfa-D)(3)(DPFBPO)(2) exhibited the highest quantum yield and fastest radiation rate (quantum yield = 78 +/- 6%, radiation rate =1.2 x 10(3) s(-1)) of the PMMA matrixes. Emission quantum yields of Eu(hfa-D)(3) (TPPO)(2) in acetone-d(6) were found to be >95%. This radiation rate is of the same order as values reported for Nd:YAG. Prepared luminescent polymers including Eu(hfa-D)(3)-(TPPO-F)(2) showed promising results for applications to novel organic Eu(III) devices, such as organic liquid lasers, plastic lasers, and optical fibers.