Binary Nanoparticle Superlattices for Plasmonically Modulating Upconversion Luminescence. Issue 38 (20th August 2020)

• Record Type: Journal Article
• Authors: Deng, Kerong; Xu, Lili; Guo, Xin; Wu, Xiaotong; Liu, Yulian; Zhu, Zhimin; Li, Qian; Zhan, Qiuqiang; Li, Chunxia; Quan, Zewei
• Is Part Of: Small. Volume 16:Issue 38(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-08-20
• Subjects: binary superlattices -- nanoparticles -- plasmonic modulation -- self‐assembly -- upconversion; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.202002066
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: Engineering a facile and controllable approach to modulate the spectral properties of lanthanide‐doped upconversion nanoparticles (UCNPs) is always an ongoing challenge. Herein, long‐range ordered, distinct two‐dimensional (2D) binary nanoparticle superlattices (BNSLs) composed of NaREF4 :Yb/Er (RE = Y and Gd) UCNPs and plasmonic metallic nanoparticles (Au NPs), including AB, AB3, and AB13 lattices, are fabricated via a slow evaporation‐driven self‐assembly to achieve plasmonic modulation of upconversion luminescence (UCL). Optical measurements reveal that typical red–green UCL from UCNPs can be effectively modulated into reddish output in BNSLs, with a drastically shortened lifetime. Notably, for AB3 ‐ and AB13 ‐type BNSLs with more proximal Au NPs around each UCNP, modified UCL with fine‐structured spectral lineshape is observed. These differences could be interpreted by the interplay of collective plasmon resonance introduced by 2D periodic Au arrays and spectrally selective energy transfer between UCNPs and Au. Thus, fabricating UCNP‐Au BNSLs with desired lattice parameters and NP configurations could be a promising way to tailor the UCL through controlled plasmonic modulation. Abstract : Homogeneous, well‐defined, and distinct two‐dimensional binary nanoparticle superlattices (BNSLs) are self‐assembled from spherical upconversion (NaREF4 :Yb/Er UCNPs) and gold nanoparticles, aiming to plasmonically modulate the upconversion luminescence (UCL). The ordered arrangement of BNSLs can achieve modified UCL with a dominant red emission, reduced lifetime, and even fine‐structured lineshape containing more sharp peaks, due to the collective plasmon resonance.