Plasmon-Enhanced Upconversion Luminescence on Vertically Aligned Gold Nanorod Monolayer Supercrystals

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• 作者：Ze Yin ; Donglei Zhou ; Wen Xu ; Shaobo Cui ; Xu Chen ; He Wang ; Shihan Xu ; Hongwei Song
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：May 11, 2016
• 年：2016
• 卷：8
• 期：18
• 页码：11667-11674
• 全文大小：472K
• 年卷期：0
• ISSN：1944-8252

文摘

Upconversion nanophosphor is attracting worldwide interests owing to its unique optical properties and great application potentials. However, it is still a great challenge to effectively improve the efficiency/strength of upconversion nanophosphor. Plasmonic modulation is a promising way to solve this bottleneck. In this work, we present a simple yet versatile concept on magnifying upconversion luminescence of NaYF₄:Yb³⁺, Er³⁺ nanocrystals through local field manipulation of surface plasmon. Gold nanorods were directionally assembled into a vertically aligned monolayer supercrystals over large areas. The FDTD simulation indicates that the electromagnetic field strength |E|² can be improved about 113 folds at the hot spots of monolayer supercrystals. After optimization, on the surface of the vertically aligned monolayer supercrystals, the overall upconversion luminescence intensity of NaYF₄:Yb³⁺, Er³⁺ under 980 nm excitation was improved more than 35 fold.