Luminescent Hybrid Ionogels Functionalized with rare Earth fluoride Up‐conversion Nanocrystals Dispersing in Ionic Liquid

Abstract

Rare earth doped fluorides (BaMgF4, aYF4 and BaYF5/BaLuF5) have been synthesized and dispersed in an ionic liquid compound, (3‐triethoxysilyl) propyl‐3‐methylimidazolium chloride (denoted as IM+Cl−). Through the cohydrolysis and copolycondensatoin reaction between the alkoxy group (3‐triethoxysilyl) of IM+ and tetraethoxysilane in the presence of carboxylic acids (formic acid) as catalyst and water source, luminescent hybrid ionogels form subsequently. 1H NMR spectroscopy, X‐ray diffraction, transmission electron microscopy, scanning electron microscopy and especially up‐conversion (UC) luminescence spectroscopy are used to characterize the precursors and the resulted hybrid ionogels. These hybrid ionogels exhibit the UC luminescence properties of immobilized rare earth fluoride nanocrystals (BaMgF4, NaYF4 and BaYF5/BaLuF5) doped Er3+/Tm3+, Yb3+.

Photofunctional Rare Earth Materials Based on Ionic Liquids

“…Red photoluminescence and near-infrared luminescence are observed for the nanoparticles doped with Eu 3+ and Nd 3+ , respectively. Yan's group also realized the dispersion of some complex rare earth fluorides with down-/up-conversion fluoride nanocrystals in different ionic liquid media [46,47]. Firstly, two typical kinds of fluoride nanocrystals codoped with rare earth ions (Eu 3+ and Tm 3+ /Er 3+ , Yb 3+ ) in ionic liquid compound with alkoxyl group 1-chlorohexane-3-methylimidazoliumchloride.…”

Formation Mechanism, Structural, and Upconversion Properties of Alkaline Rare-Earth Fluoride Nanocrystals Doped With Yb3+/Er3+ Ions

“…Instead, these systems should be considered as Ba 1– x RE x F 2+ x solid solutions . Despite this, there are some articles using the BaYF 5 formula. ,− Although some of the mixed M 2+ and RE 3+ fluorides have been investigated in recent years, their UC properties have not been compared. What is more, there is a high degree of uncertainty regarding the product composition in published articles.…”