Structural and spectroscopic studies of Eu3+ doped Lu2O3-Gd2O3 solid solutions

作者：Whiffen Radenka M Krsmanovic^*; Antic Zeljka; Speghini Adolfo; Brik Mikhail G; Bartova Barbora; Bettinelli Marco; Dramicanin Miroslav D

来源：Optical Materials, 2014, 36(6): 1083-1091.

DOI：10.1016/j.optmat.2014.01.039

• Nanophosphors
• Sesquioxides
• Rare earths
• Optical properties
• Gd2O3
• Lu2O3

A series of europium doped (LuxGd1-x)(2)O-3 (x = 1, 0.75, 0.5, 0.25 and 0) nanocrystalline powders were prepared using a polymer complex solution method based on a polyethylene glycol (PEG) as fuel. The samples were systematically characterized by powder X-ray diffraction, scanning and transmission electron microscopies and luminescence spectroscopy. The powders consisted of well-crystalline, cubic phase nanoparticles of 20-50 nm in size, which unit cell parameter increased with Gd content complying with Vegard%26apos;s law. Upon blue light excitation all samples exhibited strong red luminescence typical of trivalent europium ion. The maximum splitting of the F-7(1) manifold changed linearly with the composition change and decreased with lowering of the crystal field strength. Relatively long lifetime values were obtained for D-5(0) (similar to 1.4 ms) and D-5(1) (similar to 120 mu s) levels. For all samples we estimated theoretical densities, refractive index coefficients, optical filling factors and Z(eff), in order to estimate the Judd-Ofelt intensity parameters and branching ratios. The calculated lifetime of D-5(0) level was in line with experimentally obtained luminescence lifetime values. Relative integrated emissions were measured on all samples and Gd2O3 sample proved to have a maximum amount of the characteristic Eu3+ luminescence.

• 出版日期2014-4