Optical transition properties of Eu~3 in Eu(DBM)_3phen mono-dispersed microspheres for microcavity laser application

摘要

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 JuddOfelt 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) cm~2, 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 ~5D_0→~7F_2 transition was also evaluated.