Efficient Luminescence And Characterization Of Er³⁺-Yb³⁺-doped Mesoporous Sieves

The optical fiber network has became the most important communication system nowadays. The erbium-doped fiber amplifier is emerging as a major enabler in the development of worldwide all-optical networks. The key to improve the performance of EDFA is to develop the rare earth-doped material, which is composed by rare earth and host medium. In stead of traditional host medium silica fiber, Yb³⁺/Er³⁺ co-doped SiO₂ molecular sieve SBA-15 is studied as a novel type of photoluminescent material in this article. The absorption spectra, emission spectra, XRD, SEM, TEM can be obtained experimentally from the measurements of the host material.Upconversion is one of the reasons for reducing the gain in EDFA. A relatively weak upconversion process has been found with upconversion coefficient C=0.9-1.1×10^-18cm³/s.With respect to Judd-Ofelt theory analyses have been done to give characteristic parameters. Oscillator strength, spontaneous emission probability, branching ratio and emission lifetime of each energy levels of Er³⁺ were given. As high as 11.7×10^-21cm² of fluorescent cross-section at 1534nm and 45nm HWHM bandwidth have been reached to indicate the high efficiency of photoluminescence and wide bandwidth.