A predictive mechanoluminescence transduction model for thin-film SrAl 2 O 4 :Eu 2+ , Dy 3+ (SAOED) stress sensor

Rahimi, Mohammad Reza; Yun, Gun Jin; Choi, Ji‐Won

doi:10.1016/j.actamat.2014.06.002

Cited by 35 publications

(17 citation statements)

References 20 publications

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“…Yun et al have also employed a stress-optics transduction model to predict the contribution of the ML signal to the total recorded emission of the material. Here the ML and persistent luminescence signals are separated into three parts, namely the net ML, the stress-free luminescence and the stress-induced persistent luminescence [249]. Adoption of this predictive model could make efforts to design high-performance ML composite films, and to quantify the ML component of materials that emit both persistent luminescence and ML.…”

Section: Effects Of Persistent Luminescence and Loading Ratesmentioning

confidence: 99%

“…While offering advantages over conventional stress sensing devices, the low ML intensity of composite materials could undermine their potential to monitor the structural health of buildings and bridges during daylight hours. To date, efforts to increase the intensity of ML of materials have focused on the crystal structures and trap levels of the ML material, for example by optimizing protocols to synthesize ML particles and coatings [17,19,137,150,152,164,166,208,240,[265][266][267][268][269][270][271][272][273][274][275] that include adjusting the composition deficiency (Section 2.2) [142,150,151,173], exposing the material to SHI irradiation (Section 4.7.1) [247], by substituting host ions in the crystal [94,95,194,[265][266][267] and co-doping crystals with rare earth or transition metal ions [87,88,91,92,123,231,248,249,[268][269][270][...…”

Section: Enhancement Of ML Intensitymentioning

confidence: 99%

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Trap-controlled mechanoluminescent materials

Zhang

Wang

Marriott

et al. 2019

Progress in Materials Science

255

204

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Mechanoluminescence (ML) is generated during exposures of certain materials to mechanical stimuli. Many solid materials produce ML during their fracturing, however, the irreversibility of fracto-induced ML limits the practical applications of these materials. In 1999, Chao-Nan Xu discovered an intense and reproducible ML from trap-controlled materials, including ZnS:Mn 2+ and SrAl 2 O 4 :Eu 2+ , and introduced the principles and applications of hybrid inorganic/organic mechanoluminescent (ML) composites, and related sensors to visualize stress/strain in target structures. This discovery has triggered intense research interest in trap-controlled ML materials and composites over the past 2 decades. Notable achievements of this research include the development of trap-controlled materials that exhibit bright ML emission from the ultraviolet to the near infra-red, and multiscale mechano-optical sensitivities. This research has also increased our understanding of the mechanisms of ML phenomena, enabling the rational design of trap-controlled ML materials. Practical applications of ML are also being driven by the discovery that ML composites can serve as "mechano-optical sensitive skin" for structural health diagnosis, stress sensors for biomechanics, and mechanically-activated light sources. This review focuses on the design, synthesis, characterization, optimization and application of trap-controlled ML materials, and concludes with discussions on future directions of ML research and specific challenges to improve ML materials for real-world applications.

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Section: Effects Of Persistent Luminescence and Loading Ratesmentioning

confidence: 99%

Section: Enhancement Of ML Intensitymentioning

confidence: 99%

Trap-controlled mechanoluminescent materials

Zhang

Wang

Marriott

et al. 2019

Progress in Materials Science

255

204

View full text Add to dashboard Cite

show abstract

“…However, it will still oxidize to Eu 3+ under normal atmospheric conditions (Eu 2+/3+ E ° = −0.34 ± 0.01) . Stabilizing divalent lanthanides, like Eu(II), is paramount to not only achieving a better understanding of the electronic − and luminescent − properties of these low valent f -elements but also taking advantage of material applications such as catalysis, , medical imaging, − and sensing. , The use of bulky, encapsulating ligands to isolate low valent, redox active lanthanide metal ions from oxidizing agents under normal atmospheric conditions prevails as one of the best methods for accomplishing this goal.…”

Section: Introductionmentioning

confidence: 99%

Understanding the Stabilization and Tunability of Divalent Europium 2.2.2B Cryptates

et al. 2021

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Lanthanides such as europium with more accessible divalent states are useful for studying redox stability afforded by macrocyclic organic ligands. Substituted cryptands, such as 2.2.2B cryptand, that increase the oxidative stability of divalent europium also provide coordination environments that support synthetic alterations of Eu(II) cryptate complexes. Two single crystal structures were obtained containing nine-coordinate Eu(II) 2.2.2B cryptate complexes that differ by a single coordination site, the occupation of which is dictated by changes in reaction conditions. A crystal structure containing a [Eu(2.2.2B)Cl] + complex is obtained from a methanol−THF solvent mixture, while a methanol−acetonitrile solvent mixture affords a [Eu-(2.2.2B)(CH 3 OH)] 2+ complex. While both crystals exhibit the typical blue emission observed in most Eu(II) containing compounds as a result of 4f 6 5d 1 to 4f 7 transitions, computational results show that the substitution of a Cl − anion in the place of a methanol molecule causes mixing of the 5d excited states in the Eu(II) 2.2.2B cryptate complex. Additionally, magnetism studies reveal the identity of the capping ligand in the Eu(II) 2.2.2B cryptate complex may also lead to exchange between Eu(II) metal centers facilitated by π-stacking interactions within the structure, slightly altering the anticipated magnetic moment. The synthetic control present in these systems makes them interesting candidates for studying less stable divalent lanthanides and the effects of precise modifications of the electronic structures of low valent lanthanide elements.

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“…The novel ML material of Eu‐doped SrAl 2 O 4 (SAOE) was first innovated by highly controlling of the defect in crystal structure, and the concept on dynamic stress/strain imaging utilizing such a new ML was pioneered by Xu group . Thereafter, many researchers started researches on SAOE, and SAOE was developed for dynamic stress/strain imaging from micrometer to meter scales, both experimental analyses and theoretical simulation . The grain sizes of SAOE were fabricated to submicron/micron grain by solid phase method and 10–20 nm single‐crystal by a unique two‐liquid ultrasonic spray‐pyrolysis method, and the detailed crystal structure was clarified by synchrotron X‐ray powder diffraction analysis .…”

Section: Scalable Elasticoluminescent Strain Sensormentioning

confidence: 99%

Scalable Elasticoluminescent Strain Sensor for Precise Dynamic Stress Imaging and Onsite Infrastructure Diagnosis

Liu

Yoshida

et al. 2018

Adv Materials Technologies

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structures attracted world-wide attention in order to ensure effective maintenance and avoid recurrence of such severe disasters. [1][2][3] In December 2017, a serious incident happened at a Shinkansen bullet train of Japan due to anomalous load caused fatigue cracks and rupture in an undercarriage, [4] and this sudden incident further enhanced the urgent necessity to predict the fracture (damage) of infrastructures. Since conventional magnetic particle testing (MT), penetrant testing (PT), and ultrasonic testing (UT) methods are difficult for precise largescale infrastructure diagnosis, many techniques were proposed on this topic in recent years, such as sensing techniques of electrical resistance or capacitive MEMS strain sensors and piezoelectric sensors were proposed for precise strain or anomaly detection, but these methods still had limitations for strain imaging on real world structures due to the sensor scale and/or spatial resolution. [5][6][7][8] On the other hand, new types of sensors based on photoelectric methods such as assembled nanowires/nanotubes or microstructured rubber layers, [9][10][11][12][13][14][15] stretchable and flexible strain sensor with conductive nanostructure for sensitive detection of human motion, [16] piezotronic/piezo-phototronic-effect enhanced light emitting smart sensors, [17,18] and flexible or bionic mechanosensors were proposed as effective sensing techniques for dynamic imaging of pressure or stress and diagnosing movement disorders in high-resolution. [19][20][21][22][23] However, fabrication methods of the abovementioned nanowire array or flexible smart sensors are complicated, and they are inconvenient for scalable precise stress/strain imaging and especially difficult for large-scale application and onsite real world infrastructures.Herein, we report another mechanism of largely scalable and flexible strain sensor using elasticoluminescent smart paint for challenge to solve worldwide structural diagnosis problems ranging from micro to macroscales. The elasticoluminescence presented in this study also called elastico-mechanoluminescence is a unique form of mechanoluminescence (ML) that can generate repeatable and reproducible light emission during elastic deformation. [24][25][26][27][28][29] The new scalable elasticoluminescent strain sensor has great significance on high sensitivity and precise dynamic stress/strain imaging, and onsite fracture inspection and diagnoses on large-scale infrastructures. The innovative scalable strain sensor would prospectively open a Precise dynamic stress/strain imaging is critical for a broad range of research and engineering analyses ranging from micrometer to meter-scales, but there is no precise multiscale strain sensor, especially for onsite real-time structural health monitoring. Here, a scalable elasticoluminescent strain sensor is presented for solving worldwide structural diagnosis problems ranging from micrometer to meter-scales. Significant progress has recently been made on both highly sensitive elasticoluminescent sensor...

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A predictive mechanoluminescence transduction model for thin-film SrAl 2 O 4 :Eu 2+ , Dy 3+ (SAOED) stress sensor

Cited by 35 publications

References 20 publications

Trap-controlled mechanoluminescent materials

Trap-controlled mechanoluminescent materials

Understanding the Stabilization and Tunability of Divalent Europium 2.2.2B Cryptates

Scalable Elasticoluminescent Strain Sensor for Precise Dynamic Stress Imaging and Onsite Infrastructure Diagnosis

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