Ms. Natalia Pawlik Profile

Natalia Pawlik

at Univ of Silesia

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Proceedings Article | 17 May 2018 Paper

Multicolor emission in silica sol-gel materials co-doped with Tb3+ and Eu3+ for near-UV photonic devices

Natalia Pawlik, Barbara Szpikowska-Sroka, Maria Bańczyk, Wojciech Pisarski

Proceedings Volume 10683, 106833G (2018) https://doi.org/10.1117/12.2311638

KEYWORDS: Terbium, Europium, Sol-gels, Luminescence, Ions, Silica, Energy transfer, Near ultraviolet, Photonic devices, Light emitting diodes

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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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