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Proceedings Paper

Enhancement of up- and downconversion photoluminescence from Yb3+, Er3+ co-doped CaF2 nanoparticles deposited on two-dimensional plasmonic arrays
Author(s): Yuan Gao; Shunsuke Murai; Sayaka Tamura; Koji Tomita; Katsuhisa Tanaka
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Paper Abstract

Trivalent rare-earth (RE)-doped upconversion photoluminescence (UCPL) materials are promising in solar cell, anti-fake printing, and displays. However, the intensity of UCPL is often not high enough for practical applications, because of very weak absorption cross-section at the pump wavelength due to the parity forbidden intra-4f shell transitions of RE ions. One promising approach for the enhancement of UCPL efficiency is exploiting the coupling of RE-doped upconverters with surface plasmon resonance of a metal nanostructure. In this paper, we report lithographically fabricated two-dimensional square lattice of Al nanocylinders combined with nanoparticles layer of CaF2 codoped with Er3+,Yb3+ that shows enhanced UCPL. We systematically vary the periodicity of the lattice and examine the UCPL enhancement. The maximum UCPL enhancement is observed at a period of 750 nm, showing 22 and 13.3-fold enhancements for green and red emission branches, respectively. Moreover, we observe enhancement of downconversion emission at 1540 nm. A comparison between the experiment and simulation suggests that enlarged light absorption at the pump wavelength is a dominant factor for UCPL and downconversion enhancements.

Paper Details

Date Published: 18 November 2019
PDF: 11 pages
Proc. SPIE 11194, Plasmonics IV, 111940K (18 November 2019); doi: 10.1117/12.2538731
Show Author Affiliations
Yuan Gao, Kyoto Univ. (Japan)
Shunsuke Murai, Kyoto Univ. (Japan)
Sayaka Tamura, Tokai Univ. (Japan)
Koji Tomita, Tokai Univ. (Japan)
Katsuhisa Tanaka, Kyoto Univ. (Japan)

Published in SPIE Proceedings Vol. 11194:
Plasmonics IV
Hongxing Xu; Satoshi Kawata; Min Qiu, Editor(s)

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