Enormous plasmonic enhancement and suppressed quenching of luminescence from nanoscale ZnO films by uniformly dispersed atomic-layer-deposited platinum with optimized spacer thickness
Journal
Journal of Physical Chemistry C
Journal Volume
117
Journal Issue
49
Pages
26204-26212
Date Issued
2013
Author(s)
Abstract
High-performance plasmonic ZnO/Al2O3 spacer/nano-Pt/Al2O3/substrate multilayer structures were prepared by atomic layer deposition, in which the localized surface plasmons (LSP) were supported by the uniformly dispersed nanostructured Pt (nano-Pt) layer and a precise Al2O3 spacer was introduced to suppress luminescence quenching. Over 100-fold enhancement of photoluminescence from the ZnO emitter, which facilitates the observation of significant quantum confinement effect in the nanoscale ZnO layer as thin as ∼2 nm, was achieved. The giant plasmonic enhancement can be deduced from the optimized Al2O3 spacer thickness, which leads to the reduced coupling with nonradiative high-order LSP modes as well as the overlap between the LSP resonance wavelength and the luminescence/absorbance spectra of the ZnO emitter. This plasmonic multilayer structure with high enhancement, accuracy, tunability, uniformity, and reproducibility can be further applied in sensitive bioassays/biosensing and efficient solid-state lighting.
SDGs
Type
journal article