Enhanced Uv Upconversion Emission Using Plasmonic Nanocavities

Abstract

Upconversion of near infrared (NIR) into ultraviolet (UV) radiation could lead to a number of applications in bio-imaging, diagnostics and drug delivery. However, for bare nanoparticles, the conversion efficiency is extremely low. In this work, we experimentally demonstrate strongly enhanced upconversion emission from an ensemble of β-NaYF4:Gd3+/Yb3+/Tm3+ @NaLuF4 core-shell nanoparticles trapped in judiciously designed plasmonic nanocavities. In doing so, different metal platforms and nanostructures are systematically investigated. Our results indicate that using a cross-shape silver nanocavity, a record high enhancement of 170-fold can be obtained in the UV band centered at a wavelength of 345 nm. The observed upconversion efficiency improvement may be attributed to the increased absorption at NIR, the tailored photonic local density of states, and the light out-coupling characteristics of the cavity.

Publication Date

6-27-2016

Publication Title

Optics Express

Volume

24

Issue

13

Number of Pages

13999-14009

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1364/OE.24.013999

Socpus ID

84977677506 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84977677506

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