Enhancement of up- and downconversion photoluminescence from Yb3+, Er3+ co-doped CaF2 nanoparticles deposited on two-dimensional plasmonic arrays

Yuan Gao; Shunsuke Murai; Sayaka Tamura; Koji Tomita; Katsuhisa Tanaka

doi:10.1117/12.2538731

18 November 2019 Enhancement of up- and downconversion photoluminescence from Yb³⁺, Er³⁺ co-doped CaF₂ nanoparticles deposited on two-dimensional plasmonic arrays

Yuan Gao, Shunsuke Murai, Sayaka Tamura, Koji Tomita, Katsuhisa Tanaka

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Proceedings Volume 11194, Plasmonics IV; 111940K (2019) https://doi.org/10.1117/12.2538731
Event: SPIE/COS Photonics Asia, 2019, Hangzhou, China

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 Er^3+,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.

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Yuan Gao, Shunsuke Murai, Sayaka Tamura, Koji Tomita, and Katsuhisa Tanaka "Enhancement of up- and downconversion photoluminescence from Yb³⁺, Er³⁺ co-doped CaF₂ nanoparticles deposited on two-dimensional plasmonic arrays", Proc. SPIE 11194, Plasmonics IV, 111940K (18 November 2019); https://doi.org/10.1117/12.2538731

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KEYWORDS

Aluminum

Erbium

Ytterbium

Luminescence

Upconversion

Nanoparticles

Plasmonics

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