Broadband fluorescence emission of Eu3+ doped germanotellurite glasses for fiber-based irradiation light sources

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Original languageEnglish
Pages (from-to)1931-1943
Journal / PublicationOptical Materials Express
Issue number11
Publication statusPublished - 2013



Eu3+ doped fiber-based germanotellurite (NZPGT) glasses with medium-low maximum phonon energy of 782 cm-1 have been fabricated and characterized. Judd-Ofelt intensity parameters Ω2 (6.25 × 10-20 cm2) and Ω4 (1.77 × 10-20 cm2) indicate a high asymmetrical and covalent environment around Eu3+ in the optical glasses. The spontaneous emission probability of the dominant transition 5D07F2 peaking at 612.5 nm and the corresponding maximum stimulated emission cross-section were derived to be 445.7 s-1 and 2.05 × 10-21 cm2, respectively, confirming the effectiveness of the red fluorescence emission. The quantum yield was derived to be 12% under 391 nm LED excitation, and approximately 88% photons have been demonstrated in wavelength range of 600-720 nm, indicating that Eu3+ doped NZPGT glasses under proper excitation conditions are promising optical materials for fiber-based irradiation light sources that are competent to activate diverse photodynamic therapy photosensitizers. © 2013 Optical Society of America.

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