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Tb3+/Eu3+ co-doped silica xerogels prepared via low-temperature sol-gel method and their luminescence properties

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Abstract Silica xerogels doubly-doped with Eu3+ and Tb3+ ions were prepared via low-temperature sol-gel method. The structural properties were determined based on X-ray diffraction analysis. The optical properties were studied… Click to show full abstract

Abstract Silica xerogels doubly-doped with Eu3+ and Tb3+ ions were prepared via low-temperature sol-gel method. The structural properties were determined based on X-ray diffraction analysis. The optical properties were studied based on excitation and emission spectra as well as luminescence decay analysis and the Tb3+ → Eu3+ energy transfer was registered. Upon direct excitation of Tb3+ ions the characteristic transitions from the 5D4 state of Tb3+ and from the 5D0 state of Eu3+ were registered. This is a direct proof that energy transfer from Tb3+ to Eu3+ in silica xerogels was occurred. Furthermore, the luminescence decay analysis from the 5D0 excited states of Eu3+ upon excitation of Tb3+ at λexc = 351 nm wavelength were also carried out. The luminescence lifetime from the 5D0 state of Eu3+ after excitation at 351 nm is long-lived in comparison to excitation at 393 nm and increased by 24%.

Keywords: silica xerogels; excitation; tb3 eu3; prepared via; luminescence; eu3

Journal Title: Materials Letters
Year Published: 2019

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