Radiative Transition Probability of the Eu³⁺ Ion in Polymer Optical Fibre

An Eu-chelate-doped step-index polymer optical fiber (POF) is fabricated. Based on Judd-Ofelt (J-O) theory, the J-O parameters are calculated to be Ω₂ = 16.93 x 10^-20cm², Ω₄ = 1.36 x 10^-20cm², Ω₆ = 6.75 x 10^-20cm² from the emission spectrum of Eu(DBM)₃Phen-doped polymethyl methacrylate (PMMA). The J-O parameters have been used to calculate the total radiative transition rate (555.78 s^-1) and radiative lifetime (1799μs) of the ⁵D₀ exciting state. The stimulated emission cross-sections σ_ij and the fluorescence branch ratios β for the ⁵D₀ → ⁷F_J’ transitions are also evaluated. Analysis reveals that Eu(DBM)₃Phen-doped PMMA is promising for use in rare-earth-doped polymer optical fiber devices.