Enhancement of upconversion luminescence of Er and Yb co-doped Y2O3 nanoparticle by Ag half-shell |
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| Affiliation: | 1. Programa de Pós-Graduação em Materiais, Universidade Federal de Alagoas, 57072-970 Maceió, AL, Brazil;2. Departamento de Física, Universidade Federal de Sergipe, Cidade Universitária Prof. José Aloísio de Campos, Rod. Marechal Rondon s/n, Jardim Rosa Elze, São Cristóvão, SE 49.100-000, Brazil;3. Instituto de Física, Universidade Federal do Rio Grande do Sul, 91501-970 Porto Alegre, RS, Brazil;1. University of Belgrade, Vinča Institute of Nuclear Sciences, PO Box 522, 11001 Belgrade, Serbia;2. South Dakota School of Mines and Technology, 501 E. Saint Joseph Street, Rapid City, SD 57701, USA;1. Centro de Investigación y de Estudios Avanzados del IPN, Programa de Doctorado en Nanociencias y Nanotecnología, Av. IPN 2508, 07360 México, CDMX, Mexico;2. Centro de Investigación y de Estudios Avanzados del IPN, Departamento de Física, Av. IPN 2508, Col. San Pedro Zacatenco, 07360 México, CDMX, Mexico |
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| Abstract: | Upconversion photoluminescence (PL) properties of single Y2O3 nanoparticles doped with Yb and Er (Y2O3:Yb,Er) with a Ag over-layer is studied. We traced the PL and light scattering images of individual nanoparticles by changing the thickness of a Ag over-layer. When the Ag thickness is relatively small and only the upper part of a nanoparticle is covered by Ag (Ag half-shell), the PL is strongly enhanced. On the other hand, when the Ag thickness is increased and a continuous Ag over layer is formed, the enhancement factor decreases. From the correlation between the enhancement factors of the upconversion PL and scattering intensities as well as the change of the PL lifetime, the mechanism of the PL enhancement is discussed. |
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| Keywords: | Upconversion Nanoparticle Surface plasmon Metal half-shell |
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