Mechanical Luminescence in Europium Chelate

Yamamoto, Motokazu; Yamana, Masao

doi:10.1143/jpsj.29.807

Cited by 8 publications

(12 citation statements)

References 7 publications

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“…The brightest TL is observed visually in the case of Tb(асас) 3 •H 2 O even in a weakly shaded room as a green glow rim in the site of contact of the stirrer with the cell bottom or as flashes when the crystals are stirred in a beaker with a glass stick. The integral intensity of TL, which is equal to the sum of surface areas of bands in the TL spectra (in arb.…”

Section: Resultsmentioning

confidence: 99%

“…Complexes Ln(асас) 3 •H 2 O (Ln = Tb, Eu, Pr, Ce, Gd) (1) were synthesized and recrystallized as described previously. 10 The compositions of the complexes were determined by the complexonometric titration of Ln 3+ using a known procedure, 11 and the concentrations of С, H, O, and water were determined by elemental analysis and Fischer titration, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…10 The compositions of the complexes were determined by the complexonometric titration of Ln 3+ using a known procedure, 11 and the concentrations of С, H, O, and water were determined by elemental analysis and Fischer titration, respectively. 11 For example, for Tb(асас) 3 …”

Section: Methodsmentioning

confidence: 99%

“…In this work, we report the first observation of TL of the Ln(асас) 3 •H 2 O complexes and discuss the mecha nism of its appearance.…”

mentioning

confidence: 92%

“…1 In studies of lanthanides, TL has been detected only for a limited number of inorganic salts and heteroligand β diketonates, 2-9 whereas TL of the complexes Ln(асас) 3 •H 2 O (1) has not been described in the literature. 1 The mechanism of Ln 3+ excitation dur ing TL is not presently interpreted unambiguously.…”

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confidence: 99%

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Triboluminescence of lanthanide acetylacetonates

et al. 2004

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Triboluminescence of Ln(асас) 3 •H 2 O (Ln = Tb, Eu, Pr, Ce, Gd) was found. The UV radiation was detected for the first time as narrow bands caused by the emission of the adsorbed N 2 * molecules (transitions 3 Π u → 3 Π g ) in the study of triboluminescence of lanthanide com pounds. The emission of Ln 3+ * (ionic triboluminescence) was observed only for Tb 3+ * (λ max /nm: 490 ( 5 D 4 -7 F 6 ), 545 ( 5 D 4 -7 F 5 ), 580 ( 5 D 4 -7 F 4 )) and Eu 3+ * (λ max /nm: 613, 614 ( 5 D 2 -7 F 3 )). The generation of N 2 * occurs due to the energy of electric fields appeared upon the destruction of crystalline samples of Ln(асас) 3 •H 2 O. The Tb 3+ * and Eu 3+ * ions are formed due to the energy transfer from the triplet level of the ligand (acacT 1 ), which is excited by the light emitted from the N 2 * molecule.An interest in triboluminescence (TL), which is an emission produced by crystal destruction, is caused by a search for routes of conversion of mechanical energy into light and prospects for practical use of TL in various areas of science and technology. 1 In studies of lanthanides, TL has been detected only for a limited number of inorganic salts and heteroligand β diketonates, 2-9 whereas TL of the complexes Ln(асас) 3 •H 2 O (1) has not been described in the literature. 1 The mechanism of Ln 3+ excitation dur ing TL is not presently interpreted unambiguously. 2,6,8 For example, a study of the mechanism of TL of the europium dibenzoylmethanate complexes 2 allowed the conclusion that Eu 3+ * is formed due to the intramolecu lar energy transfer from the excited ligand to the reso nance level of the lanthanide. However, the mechanism of triplet generation from the ligand remained unclear. The authors 2 only succeeded to exclude the possibility of ligand excitation due to an electric discharge between surfaces of a fracture in crystals, because no influence of a high vacuum or the nature of the gas surrounding the crystals was observed. In the later works, 6,8 the authors concluded that the TL of the europium phenanthroline complexes is excited due to electron bombardment or charge recombination that are generated by the electric field appeared between the unlikely charged crystal sur faces. The authors 6,8 did not refine whether they implied the direct excitation of Ln 3+ or energy transfer from the excited ligand.In this work, we report the first observation of TL of the Ln(асас) 3 •H 2 O complexes and discuss the mecha nism of its appearance. ExperimentalComplexes Ln(асас) 3 •H 2 O (Ln = Tb, Eu, Pr, Ce, Gd) (1) were synthesized and recrystallized as described previously. 10 The compositions of the complexes were determined by the complexonometric titration of Ln 3+ using a known procedure, 11 and the concentrations of С, H, O, and water were determined by elemental analysis and Fischer titration, respectively. 11 For example, for Tb (асас) 3 •H 2 O found (%): Tb, 33.63; C, 37.89; H, 4.81; O, 23.67. Tb(C 5 H 7 O 2 ) 3 •H 2 O. Calculated (%): Tb, 33.54; C, 37.98; H, 4.85; O, 23.63. Complexes 1 (0.56 mmol) were plac...

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…In this work, we report the first observation of TL of the Ln(асас) 3 •H 2 O complexes and discuss the mecha nism of its appearance.…”

mentioning

confidence: 92%

mentioning

confidence: 99%

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Triboluminescence of lanthanide acetylacetonates

et al. 2004

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Mechanoluminescence Rebrightening the Prospects of Stress Sensing: A Review

2021

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Mechanoluminescence (ML) is the emission of light when a solid material is subjected to stress. [8][9] The intensity of the ML shows a strong correlation with the applied stress, making it suitable for stress sensing. ML stress sensing is based on a unique transduction principle from stress to photons, which paves the way for advanced stress sensing. In particular, ML-based sensing shows significant advantages of distributed detection and remote response to an applied stress by virtue of photon transmission through space. In addition, excellent stretchability, biocompatibility, and self-powering ability can be achieved within the stress-tophoton transduction units since electronic conduction is not needed. Importantly, ML-based sensing enables compensation of the shortcomings of conventional sensing technologies for emerging applications. Considering the many extraordinary performance characteristics, ML may hopefully rebrighten the prospects of stress sensing.Over the past few decades, ML materials and ML-based stress sensing have been extensively studied. Great efforts have been made to develop a large number of ML materials, deeply understand the ML mechanism, and boost the potential for stress sensing applications. Several review papers have been devoted to ML and its applications. [10][11][12][13][14][15][16][17] Bunzil and Wong summarized ML materials and stress sensors based on lanthanide compounds. [10] Xie and Li surveyed the progress in ML compounds with a focus on fractoluminescence. [11] An overview of inorganic ML compounds was presented by Feng and Smet, which particularly provides deep insight into the crystal structures and their relation to ML. [12] Additionally, Zhang et al. reviewed inorganic ML compounds, concentrating on their compositions, preparation, characterizations, mechanisms, and applications. [13] However, compared with materials and mechanisms, less attention has been paid to the technical performance of ML-based stress sensing and its relevance to applications. Obviously, reasonable analyses of the up-to-date performance are beneficial for properly assessing the potential for future applications.In this paper, we start with a brief overview of the desired performance characteristics of advanced stress sensing for several new applications (Section 2). The state-of-arts and challenges are highlighted. In Section 3, ML materials, ML-based sensors, and technical features will be discussed in an attempt to comprehensively evaluate ML-based sensing technology andThe emergence of new applications, such as in artificial intelligence, the internet of things, and biotechnology, has driven the evolution of stress sensing technology. For these emerging applications, stretchability, remoteness, stress distribution, a multimodal nature, and biocompatibility are important performance characteristics of stress sensors. Mechanoluminescence (ML)-based stress sensing has attracted widespread attention because of its characteristics of remoteness and having a distributed response to mechanical stimuli...

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Survey of the literature on mechanoluminescence from 1605 to 2013

2014

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Mechanoluminescence (ML) is a type of luminescence induced by any mechanical action on solids. The light emissions induced by elastic deformation, plastic deformation and fracture of solids are called elastico ML (EML), plastico ML (PML) and fracto ML (FML), respectively. Whereas nearly 50% of all organic molecular solids and inorganic salts exhibit FML, only a few solids exhibit EML and PML. The EML and FML of certain solids are so intense that they can be seen during daylight with the naked eye. Mechanolumnescence has a great potential for use in different types of mechano-optical devices such as stress sensors, damage sensors, impact sensors, fracture sensors and safety management monitoring systems. This article reports a survey of the literature from 1605 to 2013. Mechanoluminescence is studied by physicists, chemists, material scientists, geologists, medical scientists, engineers and technologists, among others and researchers will certainly benefit from the literature survey on ML given here. In addition, the field of mechanoluminescence may attract the interest of many new researchers.

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Mechanical Luminescence in Europium Chelate

Cited by 8 publications

References 7 publications

Triboluminescence of lanthanide acetylacetonates

Triboluminescence of lanthanide acetylacetonates

Mechanoluminescence Rebrightening the Prospects of Stress Sensing: A Review

Survey of the literature on mechanoluminescence from 1605 to 2013

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