Premium
Au/NaYF 4 : Yb,Er Binary Superparticles: Synthesis and Optical Properties
Author(s) -
Zhao Junwei,
Wu Jian,
Xue Junfei,
Zhu Qiannan,
Ni Weihai
Publication year - 2016
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1002/ijch.201500021
Subject(s) - photon upconversion , nanotechnology , nanomaterials , luminescence , nanoparticle , förster resonance energy transfer , chemistry , nanocomposite , mesoscopic physics , nanoscopic scale , evaporation , energy transfer , fluorescence , colloidal gold , materials science , optoelectronics , chemical physics , physics , quantum mechanics , thermodynamics
Colloidal superparticles (SPs) are nanoparticle (NP) assemblies in the form of colloidal particles. Assembling nanoscopic objects into mesoscopic or macroscopic composite architectures allows for the bottom‐up fabrication of functional nanomaterials. In this study, a method for single‐step self‐assembly synthesis of Au/NaYF 4 : Yb,Er SPs was developed using oil‐in‐water (O/W) microemulsions to simultaneously encapsulate gold nanoparticles (AuNPs) and NaYF 4 : Yb,Er upconversion nanoparticles (UCNPs) via evaporation at room temperature. The synthesized Au/NaYF 4 : Yb,Er SPs possess good dispersibility and stability. When the number of AuNPs added is increased, the SPs exhibit decreased upconversion luminescence, which can be ascribed to the Förster resonance energy transfer (FRET) from the NaYF 4 : Yb,Er UCNPs to the AuNPs. Time‐resolved measurements of the green emission further confirm the existence of a new decay route corresponding to the FRET process. Our research provides a facile and versatile strategy for the synthesis of novel multifunctional nanocomposites with tunable upconversion luminescence properties, which can be of great significance in biological applications.