Luminescent Properties of LaPO4:Eu Nanoparticles and Nanowires
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Abstract
Nanoparticles (NPs) and nanowires (NWs) as well as micrometer particles (MPs) and micrometer rods (MRs) of LaPO4:Eu phosphors were synthesized by the hydrothermal method. Their luminescent properties, including local symmetry surrounding Eu3+ ions and electronic transition processes, were studied and compared. The results indicated that, in NPs and MPs, Eu3+ occupied only one site, A, while in NWs and MRs, Eu3+ occupied the same site, A, and an additional site, B. Varying from NWs to MRs, the relative emission intensity of Eu3+ ions at site B was reduced. The radiative transition rates of 5D1−∑J7FJ and nonradiative transition rates of 5D1−5D0 in different powders were obtained by measuring temperature-dependent luminescent dynamics. The results indicated that the radiative transition rate of 5D1−∑J7FJ in NWs increased 1.5−1.8 times over that in NPs, MPs, and MRs, while the nonradiative transition rates had only a little variation. Thereby, the luminescent quantum efficiency (QE) of 5D1 at 0 K in NPs, NWs, MPs, and MRs was deduced to be 38%, 59%, 49%, and 47%, respectively. The radiative transition rate of 5D0−∑J7FJ in NWs also increased ∼1.5 times. The increase of the radiative electronic transition rate in NWs was attributed to the variation of dipole field caused by the shape anisotropy.
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