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17 May 2018 Multicolor emission in silica sol-gel materials co-doped with Tb3+ and Eu3+ for near-UV photonic devices
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In this work, the luminescence properties of silica materials singly- and doubly-doped with Tb3+ and Eu3+ ions derived by low-temperature sol-gel technique were investigated. The optical properties of prepared samples were evaluated based on photoluminescence excitation (PLE) and emission spectra (PL) as well as luminescence decay analysis. The PL measurements of investigated Tb3+/Eu3+ co-doped systems were conducted using different excitation wavelengths. Prepared sol-gel materials exhibit bright multicolor, wavelength-tunable luminescence under near-UV illumination. Indicated emission is originated from electronic transitions within 4f6 and 4f8 manifolds of Eu3+ and Tb3+, respectively. Additionally, based on recorded decay curves, the luminescence lifetimes (τm) for the 5 D0 state of Eu3+ and the 5D4 level of Tb3+ were also evaluated. Obtained results indicated that co-doping with Tb3+ ions led to prolongation of luminescence lifetime of the 5D0 state of Eu3+ up to ~24% due to Tb3+ → Eu3+ energy transfer process. The interpretation of obtained results may suggests the potential usage of fabricated Tb3+/Eu3+ co-doped sol-gel materials in optical devices operating under near-UV excitation.
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Natalia Pawlik, Barbara Szpikowska-Sroka, Maria Bańczyk, and Wojciech A. Pisarski "Multicolor emission in silica sol-gel materials co-doped with Tb3+ and Eu3+ for near-UV photonic devices", Proc. SPIE 10683, Fiber Lasers and Glass Photonics: Materials through Applications, 106833G (17 May 2018);

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