Journal
MATERIALS SCIENCE AND ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS
Volume 102, Issue -, Pages 569-577Publisher
ELSEVIER
DOI: 10.1016/j.msec.2019.04.080
Keywords
Upconversion nanoparticle; Cicada wing; Photonic substrate; Anti-reflection; Plasmonic enhancement
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Funding
- Ministry of Science and Technology, Taiwan [MOST 104-2112-M-010-002-MY3, 107-2112-M-010-003-MY3]
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We demonstrate that the upconversion nanoparticles (UCNPs) fluoresce 50 times more on a gold (Au) coated Cicada wing. UCNPs are attractive bioimaging, and therapeutic materials as it is excited in the infrared, limited only by the low fluorescence quantum yield. Here, a plasmonic effect, coupled with an anti-reflecting (AR) Cicada wing substrate coated with Au is demonstrated to enhance the fluorescence of the UCNPs. Silica (SiO2) coated Erbium doped green emitting core-shell UCNPs (NaYF4: Yb3+, Er3+@SiO2) show conventional metal enhanced fluorescence. The AR property of the Cicada wing (R similar to 0.2% @ 1000 nm) contributes > 6-fold enhancement as compared to flat (silicon, and quartz) substrates (R similar to 10-30% @ 1000 nm). Upon plasmon coupling, with an optimally sputtered Au coating, an unprecedented enhancement of > 50-fold for the 520, and 655 nm emission was obtained on the Au coated Cicada wings, vis-a-vis planar uncoated (silicon, and quartz) substrates. The enhancement was also confirmed by direct fluorescence imaging of the photonic substrates used. The fluorescence lifetime of the core, and the core-shell UCNPs (similar to 300 mu s) decreased by similar to 30-40%, and 10-30%, respectively, when placed on Au coated substrates.
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