Non-Linear Density Dependent Upconversion Luminescence Enhancement of β-NaYF4: Yb3+: Er3+ Nanoparticles on Random Ag Nanowire Aggregates. Issue 38 (16th May 2016)

• Record Type: Journal Article
• Authors: Hor, Amy; Luu, Quoc Anh N.; May, P. Stanley; Berry, Mary; Smith, Steve
• Is Part Of: MRS advances. Volume 1:Issue 38(2016)
• Page Start: 2677
• Page End: 2682
• Publication Date: 2016-05-16
• Subjects: Yb, -- Er, -- lanthanide; Electrical engineering -- Congresses; Physics -- Congresses; Materials -- Research -- Congresses; Materials science -- Congresses; 620.11
• DOI: 10.1557/adv.2016.356
• Languages: English
• ISSNs: 2059-8521

Abstract

ABSTRACT: Spectroscopic imaging and statistical analysis of NIR-to-visible upconversion luminescence (UCL) from β-NaYF4 :Yb 3+ :Er 3+ upconverting nanoparticles (UCNPs) supported on a series of random Ag nanowire aggregates reveals a density dependent UCL enhancement. Statistical analysis of the spectrally resolved upconversion images shows a non-linear dependence of upconversion luminescence enhancement with Ag nanowire surface coverage. A maximum average enhancement of 5.8× was observed for 58% surface coverage. Based on the empirically determined trend with density, it is estimated that up to 20× upconversion luminescence enhancement can be achieved at 100% surface coverage, even at high excitation intensity. This projection is commensurate with the 20× enhancement ratio observed for select locations within the imaged micro-ensemble. Time-resolved emission of the UC luminescence from UCNPs on the Ag nanowire aggregates confirms the surface plasmon effects on the UCNPs kinetics. Such Ag nanowire aggregates show potential as a scalable and relatively simple metal-enhanced upconversion substrate.