Cryogenic Luminescent Tb/Eu-MOF Thermometer Based on a Fluorine-Modified Tetracarboxylate Ligand

Abstract

A fluorine-modified tetracarboxylic acid ligand, namely, 2′-fluoro-[1,1′:4′,1′′-terphenyl]-3,3′′,5,5′′-tetracarboxylic acid (H4FTPTC), with suitable triplet energy excited state, was designed and applied to construct the luminescent lanthanide metal–organic frameworks (LnMOFs) for cryogenic temperature sensing. With the lanthanides codoping strategy, we developed a new Tb3+/Eu3+ mixed LnMOF system Tb 1–x Eu x FTPTC (x = 0.05, 0.1, 0.2), which feature excellent linear responses to temperature with high relative sensitivity in the cryogenic range of 25–125 K. It was found that the relative sensitivity of such mixed LnMOF could readily be tuned by adjusting the incorporation amount of Eu3+ ions in the host framework. In addition, the energy transfer efficiency between the Tb3+ and Eu3+ ions in the framework with different Tb3+/Eu3+ ratios are also investigated and discussed.

808 nm‐Light‐Excited Near‐Infrared Luminescent Lanthanide Metal–Organic Frameworks for Highly Sensitive Physiological Temperature Sensing

“…According to this definition, the relative sensitivity S r of Nd 0.5 Yb 0.5 TPTC is calculated to be 12.46 % K −1 at 293 K, then steadily decreases to 3.91 % K −1 at 328 K (Figure d), which is much higher than that of many reported dual‐emitting MOF thermometers in physiological temperatures (Table S3, Supporting Information) . The high sensitivity of Nd 0.5 Yb 0.5 TPTC can be attributed to the enhancement of the Yb 3+ emission based on the efficient Nd 3+ ‐to‐Yb 3+ energy transfer in the dimetallic units.…”

“…The ligand H 4 TPTC used in this work was synthesized according to the previously reported literature . 1 H NMR (600 MHz, [D 6 ]DMSO), δ =8.50 (t, 1 H), 8.46 (d, 2 H), 7.92 ppm (s, 4 H); 13 C NMR (150 MHz, [D 6 ]DMSO), δ =167.03, 140.64, 138.64, 132.89, 131.52, 129.48, 128.17 ppm; Anal.…”

Hydrothermal Synthesis and Up‐conversion Luminescence of Ho3+/Yb3+ Co‐doped PbTiO3

“…However, these mentioned sensors have some limitations, for their large size, use of electrical modules, invasiveness and so on. To overcome these weaknesses, luminescence‐based materials, including up‐conversion RE‐oxide materials and lanthanide metal‐organic frameworks (LnMOFs), have been explored to use as temperature sensing for their unique advantages of contactless measurement and large‐scale imaging , …”

A Specific Fluorescent Probe for Antimony Based on Aggregation Induced Emission

“…Although they can detect antimony in very low concentration, the cost is quite expensive and the testing procedures are usually complicated. Fluorescent probes,, which can achieve bio/chemical detection just by the change of emission intensity, are hopefully to be one kind of the simple way to do antimony detection, and lots of fluorescent sensors with special structures such as MOFs, quantum dots, and nano‐structures have been reported nowadays. However, the reported probes, such as nanowires with core‐shell structure and quantum dots composed of BSA and CdTe, which display perfect fluorescent response to antimony based on fluorescence resonance energy transfer (FRET) or photo‐induced electron transfer (PET), usually have quite complicated structure and difficult to prepare , .…”