Nanocrystalline Lu(3)Ga(5)O(12), with average particle sizes of 40 nm, doped with a wide variety of luminescent trivalent lanthanide ions have been prepared using a sol-gel technique. The structural and morphological properties of the powders have been investigated by x-ray powder diffraction, high resolution transmission electron microscopy and Raman spectroscopy. Structural data have been refined and are presented for Pr(3+), Eu(3+), Gd(3+), Ho(3+), Er(3+) and Tm(3+) dopants, while room temperature excited luminescence spectra and emission decay curves of Eu(3+)-, Tm(3+)- and Ho(3+)-doped Lu(3)Ga(5)O(12) nanocrystals have been measured and are discussed. The Eu3+ emission spectrum shows typical bands due to (5)D(0) -> (7)F(J) (J = 0, 1, 2, 3, 4) transitions and the broadening of these emission bands with the non-exponential behaviour of the decay curves indicates the presence of structural disorder around the lanthanide ions. Lanthanide-doped nanocrystalline Lu(3)Ga(5)O(12) materials show better luminescence intensities compared to Y(2)O(3), Gd(3)Ga(5)O(12) and Y(3)Al(5)O(12) nanocrystalline hosts. Moreover, the upconversion emission intensity in the blue-green region for the Tm(3+)- and Ho(3+)-doped samples shows a significant increase upon 647.5 nm excitation with respect to other common oxide hosts doped with the same lanthanide ions.

Nanocrystalline lanthanide-doped Lu(3)Ga(5)O(12) garnets: interesting materials for light-emitting devices RID A-2616-2008 / Venkatramu, V; Giarola, M; Mariotto, G; Enzo, Stefano; Polizzi, S; Jayasankar, Ck; Piccinelli, F; Bettinelli, M; Speghini, A.. - In: NANOTECHNOLOGY. - ISSN 0957-4484. - 21:17(2010). [10.1088/0957-4484/21/17/175703]

Nanocrystalline lanthanide-doped Lu(3)Ga(5)O(12) garnets: interesting materials for light-emitting devices RID A-2616-2008

ENZO, Stefano;
2010-01-01

Abstract

Nanocrystalline Lu(3)Ga(5)O(12), with average particle sizes of 40 nm, doped with a wide variety of luminescent trivalent lanthanide ions have been prepared using a sol-gel technique. The structural and morphological properties of the powders have been investigated by x-ray powder diffraction, high resolution transmission electron microscopy and Raman spectroscopy. Structural data have been refined and are presented for Pr(3+), Eu(3+), Gd(3+), Ho(3+), Er(3+) and Tm(3+) dopants, while room temperature excited luminescence spectra and emission decay curves of Eu(3+)-, Tm(3+)- and Ho(3+)-doped Lu(3)Ga(5)O(12) nanocrystals have been measured and are discussed. The Eu3+ emission spectrum shows typical bands due to (5)D(0) -> (7)F(J) (J = 0, 1, 2, 3, 4) transitions and the broadening of these emission bands with the non-exponential behaviour of the decay curves indicates the presence of structural disorder around the lanthanide ions. Lanthanide-doped nanocrystalline Lu(3)Ga(5)O(12) materials show better luminescence intensities compared to Y(2)O(3), Gd(3)Ga(5)O(12) and Y(3)Al(5)O(12) nanocrystalline hosts. Moreover, the upconversion emission intensity in the blue-green region for the Tm(3+)- and Ho(3+)-doped samples shows a significant increase upon 647.5 nm excitation with respect to other common oxide hosts doped with the same lanthanide ions.
2010
Nanocrystalline lanthanide-doped Lu(3)Ga(5)O(12) garnets: interesting materials for light-emitting devices RID A-2616-2008 / Venkatramu, V; Giarola, M; Mariotto, G; Enzo, Stefano; Polizzi, S; Jayasankar, Ck; Piccinelli, F; Bettinelli, M; Speghini, A.. - In: NANOTECHNOLOGY. - ISSN 0957-4484. - 21:17(2010). [10.1088/0957-4484/21/17/175703]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11388/60284
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