Plasmonic enhancement of upconversion emission in Ag@NaYF4:Er3+/Yb3+ phosphor |
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| Authors: | SK Maurya SP Tiwari A Kumar K Kumar |
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| Affiliation: | Optical Materials and Bio-imaging Research Laboratory, Department of Applied Physics, Indian Institute of Technology (Indian School of Mines), Dhanbad-826004, India |
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| Abstract: | In this article upconversion luminescence of silver nanoparticles (AgNPs) coated NaYF4:Er3+/Yb3+ phosphor nano-particles was investigated. The prepared samples were characterized through various techniques. The surface plasmon band is observed for prepared AgNPs by analyzing UV-vis measurements and is used to enhance the upconversion emission. From the upconversion measurement the emission bands are observed at 522, 546, and 656 nm corresponding to the 2H11/2 → 4I15/2, 4S3/2 → 4I15/2 and 4F9/2 → 4I15/2 levels, respectively. The upconversion emission intensity of the above bands is found to enhance for sample containing 1 mmol AgNPs. Decay time of 4S3/2 and 4F9/2 levels is found to decrease on coating of AgNPs and hence intensity enhancement is assumed due to the surface plasmon resonance (SPR) effect. |
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| Keywords: | Upconversion phosphor Surface plasmon resonance Decay time analysis CIE diagram Rare earths |
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