Optical transition properties of Eu3+ in Eu(DBM)3phen mono-dispersed microspheres for microcavity laser application

Mono-dispersed microspheres of ternary complex Eu(DBM)3phen (DBM=dibenzoylmethide; phen=1,10-phenanthroline) were prepared through a facile process. The obtained sample was characterized by means of X-ray powder diffraction (XRD) and scanning electron microscope (SEM). And the luminescence properties of the Eu(DBM)3phen were investigated by the fluorescence spectra and the fluorescence decay. According to Judd–Ofelt theory, the optical transition intensity parameters Ωλ (λ=2, 4 and 6) were obtained to be 20.99×10−20, 0.98×10−20 and 1.79×10−20 cm2, respectively. The radiative transition properties of 5D0 level, including transition rates, branch ratios and radiative transition lifetime were calculated. As a potential material for microsphere lasers, the optical gain performance for 5D0→7F2 transition was also evaluated.