Enormous Plasmonic Enhancement and Suppressed Quenching of Luminescence from Nanoscale ZnO Films by Uniformly Dispersed Atomic-Layer-Deposited Platinum with Optimized Spacer Thickness

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• 作者：Chung-Ting Ko ; Yin-Yi Han ; Ching-Hsiang Chen ; Jay Shieh ; Miin-Jang Chen
• 刊名：Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：December 12, 2013
• 年：2013
• 卷：117
• 期：49
• 页码：26204-26212
• 全文大小：468K
• 年卷期：v.117,no.49(December 12, 2013)
• ISSN：1932-7455

文摘

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.