Photon upconversion in core-shell nanoparticles

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Original languageEnglish
Pages (from-to)1318-1330
Journal / PublicationChemical Society Reviews
Volume44
Issue number6
Online published24 Jul 2014
Publication statusPublished - 21 Mar 2015

Abstract

Photon upconversion generally results from a series of successive electronic transitions within complex energy levels of lanthanide ions that are embedded in the lattice of a crystalline solid. In conventional lanthanide-doped upconversion nanoparticles, the dopant ions homogeneously distributed in the host lattice are readily accessible to surface quenchers and lose their excitation energy, giving rise to weak and susceptible emissions. Therefore, present studies on upconversion are mainly focused on core-shell nanoparticles comprising spatially confined dopant ions. By doping upconverting lanthanide ions in the interior of a core-shell nanoparticle, the upconversion emission can be substantially enhanced, and the optical integrity of the nanoparticles can be largely preserved. Optically active shells are also frequently employed to impart multiple functionalities to upconversion nanoparticles. Intriguingly, the core-shell design introduces the possibility of constructing novel upconversion nanoparticles by exploiting the energy exchange interactions across the core-shell interface. In this tutorial review, we highlight recent advances in the development of upconversion core-shell nanoparticles, with particular emphasis on the emerging strategies for regulating the interplay of dopant interactions through core-shell nanostructural engineering that leads to unprecedented upconversion properties. The improved control over photon energy conversion will open up new opportunities for biological and energy applications. 

Citation Format(s)

Photon upconversion in core-shell nanoparticles. / Chen, Xian; Peng, Denfeng; Ju, Qiang et al.
In: Chemical Society Reviews, Vol. 44, No. 6, 21.03.2015, p. 1318-1330.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review