Nonradiative deactivation of europium(<scp>iii</scp>) luminescence as a detection scheme for moisture

Knall, Astrid‐Caroline; Tscherner, Martin; Noormofidi, Nadja; Pein, Andreas; Saf, Robert; Mereiter, Kurt; Ribitsch, Volker; Stelzer, Franz; Slugovc, Christian

doi:10.1039/c1an15987a

Cited by 10 publications

(15 citation statements)

References 18 publications

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“…A copolymer containing a Eu 3+ chelate that can be spin-cast as thin film on glass slides was developed [110]. Scheme 6 shows the chemical structure of the polymerizable precursor 29.…”

Section: Humidity Sensorsmentioning

confidence: 99%

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Luminescent Chemical and Physical Sensors Based on Lanthanide Complexes

Spangler

Schäferling

2010

Lanthanide Luminescence

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Luminescent lanthanide complexes (LLCs) are versatile probes for the determination of a variety of analytes such as metal ions, anions, hydrogen peroxide, ATP, pH, or oxygen. Antenna chromophores have been introduced as ligands for sensitizing lanthanide emission. The ligand system or the lanthanide ion can act as receptors for reversible binding of analytes. Thus, the response of luminescence emission can occur via ligand or metal-centered processes, which will both be discussed. LLCs, particularly Eu 3+ and Tb 3+ complexes, have been incorporated in solid state matrices, e.g., polymer hydrogels or silica to obtain optical sensor layers. A selection of such sensitive materials will be outlined, including sensors for the analytically relevant parameters oxygen, pH, hydrogen peroxide, humidity, and temperature.

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“…A copolymer containing a Eu 3+ chelate that can be spin-cast as thin film on glass slides was developed [110]. Scheme 6 shows the chemical structure of the polymerizable precursor 29.…”

Section: Humidity Sensorsmentioning

confidence: 99%

“…This complex can be copolymerized with norbornene-2,3-dicarboxylic acid dimethyl ester by means of ring opening metathesis polymerization. The sensor spots respond to water vapor by reversible luminescence quenching, which can be analyzed by means of phase sensitive measurements of luminescence lifetime [110].…”

Section: Humidity Sensorsmentioning

confidence: 99%

Luminescent Chemical and Physical Sensors Based on Lanthanide Complexes

Spangler

Schäferling

2010

Lanthanide Luminescence

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“…The authors speculated that the response mechanism involves the coordination of water molecules to the europium center at the ninth coordination site; this coordination may cause a structural rearrangement that is not favorable for the transfer of energy from the ligand to the europium ion. Knall et al applied different europium(III) compounds combined with polymeric matrix materials as sensitive dyes for time‐resolved humidity detection 16. The luminescence quenching of ligand‐treated Eu III ‐doped mesoporous silica thin films (MSTFs) as a function of relative humidity was studied by Park et al17 The authors proposed that the response mechanism involves the substitution of the ligand in the pores of EuL m by water molecules, as suggested by a time‐decay kinetics study of the excited states of phen‐treated Eu MSTF.…”

Section: Introductionmentioning

confidence: 99%

Fluorescence Quenching of a Europium Coordination Compound for the Detection of Trace Amounts of Water: Uncovering the Response Mechanism by Structural Confirmation

Song

Chai

et al. 2015

Eur J Inorg Chem

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The coordination compound Eu(DAF)2(NO3)3 (1, DAF = 4,5‐diazafluorene), which shows strong red fluorescence, has been synthesized and characterized. The luminescence‐quenching effect of 1 has been applied to the detection of water in CH3CN. For the first time, the response mechanism has been uncovered through the confirmation of the structure of the resultant nonluminous compound [Eu(NO3)2(H2O)5](NO3)(DAF)2·H2O (2). The replacement of the coordinated DAF ligands by the added water led to quenching of the emission of the EuIII ion and the simultaneous enhancement of the ligand emission. X‐ray powder diffraction and thermogravimetric analyses also confirmed this mechanism. Theoretical calculations by the semi‐empirical method revealed the origin of the absorption spectra of 1. This fluorometric detection of trace amounts of water in CH3CN by 1 is a direct, rapid, and sensitive method.

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“…Knall's group developed a detection scheme for moisture using the nonradiative deactivation of the excited state of sensitized europium emission via OH-vibrations in the presence of water. 15,16 In this kind of sensitized europium complexes, the energy transfer from the ligand to the Eu 3+ ions by the ''antenna effect'' results in the enhanced luminescence of the Eu 3+ ions. 17 Interestingly, the emission of Eu 3+ ions can be deactivated obviously.…”

Section: Introductionmentioning

confidence: 99%

Moisture-responsive films consisting of luminescent polyoxometalates and agarose

Qiu

Liu

et al. 2015

J. Mater. Chem. C

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A novel switchable and tunable luminescent composite film consisted of Na 9 [EuW 10 O 36 ]·32H 2 O (EuW 10 ) and agarose has been prepared. EuW 10 can be converted into non-luminescent species by photoreduction and the recovery is facilitated by oxidation under moisture air. The luminescence recovery of the UV-reduced film showed dependence on the relative humidity (RH) ranging from 43 to 78% in a certain exposure time. X-ray photoelectron energy spectroscopy (XPS) measurements confirm the generation of the reduced W 5+ species in EuW 10 polyoxoanion. Further analysis of EuW 10 indicates that the photo-generated d 1 electron hopping is prohibited in the hybrid film. The absence of recombination of the photogenerated d 1 electrons and holes, and the consumption of holes to form •OH radical are responsible for the luminescence quenching rather than luminescence resonance energy transfer (LRET). The moisture-responsive behavior of EuW 10 /Agarose film is attributed to the kinetically controlled back reaction of W 5+ O 6 with O 2 . Present study provides new insights for lanthanide-containing POMs as tunable luminescent components in UV and moisture dualresponsive materials.

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Nonradiative deactivation of europium(iii) luminescence as a detection scheme for moisture

Abstract: The nonradiative deactivation of the excited state of europium(III)-based phosphors via OH-vibrations in the presence of water allows the detection of moisture in nitrogen at concentration levels down to at least 25 ppm (0.09% RH).

Cited by 10 publications

References 18 publications

Luminescent Chemical and Physical Sensors Based on Lanthanide Complexes

Luminescent Chemical and Physical Sensors Based on Lanthanide Complexes

Fluorescence Quenching of a Europium Coordination Compound for the Detection of Trace Amounts of Water: Uncovering the Response Mechanism by Structural Confirmation

Moisture-responsive films consisting of luminescent polyoxometalates and agarose

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