Luminescent Polymer Containing the Eu(III) Complex Having Fast Radiation Rate and High Emission Quantum Efficiency

Abstract

Radiation rates and emission quantum yields of Eu(III) were modified using asymmetric deuterated Eu(III) 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(III) 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 × 103 s-1) of the PMMA matrixes. Emission quantum yields of Eu(hfa-D)3 (TPPO)2 in acetone-d6 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.