Absorption cross-section control of Eu(III) complexes for increase of amplified spontaneous emission excited by third harmonic of nanosecond Nd:YAG laser

The amplified spontaneous emission (ASE) properties of polymer thin-films containing Eu(III) complexes were demonstrated by observating emissions from the edge of excited polymer thin-films. The amplification of the ASE components of Eu(III) complexes was increased in proportion to the absorption cross-sections. In particular, the amplitude percentages of the ASE component of Eu(III) complexes having naphthyl groups (absorption cross-section at 355 nm: 850 × 10−19 cm2) were estimated to be over 60% under 10 mJ excitation.