Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 117, Issue 2, Pages 1113-1120Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp309510s
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Funding
- Izumi Science and Technology Foundation
- Grants-in-Aid for Scientific Research [23310064] Funding Source: KAKEN
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Upconversion photoluminescence (PL) of a composite nanoparticle consisting of an Er and Yb codoped NaYF4 core and a Au shell is studied theoretically and experimentally. We first investigate the effects of a Au shell on the radiative and nonradiative emission rates of a dipole placed in a core, the absorption and scattering cross sections of a composite nanoparticle, and the electric field within a core at the excitation wavelength. We then synthesize the composite nanoparticle and study the PL properties. From the analyses of the PL data in combination with the data obtained by theoretical calculations, the mechanism of the enhancement and quenching of upconversion PL by the formation of a Au shell is studied.
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