Emission-Decay Curves, Energy-Transfer and Effective-Refractive Index in Gd2O3:Eu3+ Nanorods
authors Debasu, ML; Ananias, D; Macedo, AG; Rocha, J; Carlos, LD
nationality International
journal JOURNAL OF PHYSICAL CHEMISTRY C
keywords GADOLINIUM OXIDE NANOPARTICLES; LUMINESCENT PROPERTIES; RADIATIVE LIFETIME; EXCITED STATES; NANOCRYSTALS; IONS; EU3+; RELAXATION; LATTICE; SITES
abstract Cubic Gd2O3:Eu3+ (0.30, 1.01, 2.78, and 4.60 mol %) nanorods with an average diameter of ca. 14 nm were synthesized at ambient pressure and mild temperature (70 degrees C), using a simple and cost-effective wet-chemical route. The emission-decay curves of the D-5(1) and D-5(0) levels, hereafter referred to as D-5(1) (C-2) and D-5(0)(C-2), were investigated. Although the decay time of the D-5(0) level of the Eu3+ ions residing in the C-2 site of cubic Gd2O3:Eu3+ nanostructures were previously reported, little is known about the rise time component in the D-5(0) emission-decay curve and the energy-transfer pathways responsible for it. The D-5(0)(C-2) rise time and the D-5(1)(C-2) decay time exhibit similar and strong dependence on the Eu3+ concentration and temperature. The D-5(1)(C-2) decay time matches well the rise time extracted from the rising component of the D-5(0)(C-2) emission-decay curve. The decay time of the D-5(0)(C-2) level (ranging from 1.4 to 2.1 ms, depending on the filing factor of the nanorods) is longer than that of the bulk counterpart mainly due to the reduction in the size of the nanorods, which introduces an effective-refractive index smaller than the refractive index of Gd2O3.
publisher AMER CHEMICAL SOC
issn 1932-7447
year published 2011
volume 115
issue 31
beginning page 15297
ending page 15303
digital object identifier (doi) 10.1021/jp205093x
web of science category Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
subject category Chemistry; Science & Technology - Other Topics; Materials Science
unique article identifier WOS:000293419700024
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