Plasmonic enhancement of upconversion emission in Ag@NaYF4:Er3+/Yb3+ phosphor
来源期刊:JOURNAL OF RARE EARTHS2018年第9期
论文作者:S.K.Maurya S.P.Tiwari A.Kumar K.Kumar
文章页码:903 - 910
摘 要: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 2 H11/2→ 4115/2,4 S3/2→4 I15/2and 4 F9/2→4 I15/2 levels,respectively.The upconversion emission intensity of the above bands is found to enhance for sample containing 1 mmol AgNPs.Decay time of 4 S3/2 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.
S.K.Maurya,S.P.Tiwari,A.Kumar,K.Kumar
Optical Materials and Bio-imaging Research Laboratory,Department of Applied Physics,Indian Institute of Technology (Indian School of Mines)
摘 要: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 2 H11/2→ 4115/2,4 S3/2→4 I15/2and 4 F9/2→4 I15/2 levels,respectively.The upconversion emission intensity of the above bands is found to enhance for sample containing 1 mmol AgNPs.Decay time of 4 S3/2 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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