Effect of Oxygen Vacancies on the Mechanoluminescence Response of Magnesium Oxide

Novitskaya, Ekaterina; Manheim, Aaron; Herrera, Manuel; Graeve, Olivia A.

doi:10.1021/acs.jpcc.0c07674

Cited by 6 publications

(5 citation statements)

References 64 publications

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“…Eu 2+ /Eu 3+ -, Ce 3+ -, and Tb 3+ -doped HAp powders (HAp:Eu, HAp:Ce, and HAp:Tb) were synthesized by solution combustion synthesis. − The reagents used were calcium nitrate tetrahydrate [Ca(NO 3 ) 2 ·4H 2 O, 99%], ammonium hydrogen phosphate [(NH 4 ) 2 HPO 4 , 98%], and carbohydrazide [CO(NHNH 2 ) 2 , 97%], acquired from Alfa Aesar (Ward Hill, MA). Cerium nitrate hexahydrate [Ce(NO 3 ) 3 ·6H 2 O, 99.9%] and terbium nitrate hexahydrate [Tb(NO 3 ) 3 ·6H 2 O, 99.9%] from Sigma-Aldrich (Burlington, MA), and europium nitrate hexahydrate [Eu(NO 3 ) 3 ·6H 2 O, 99.9%] from Alfa Aesar were used as the sources of the rare-earth dopants.…”

Section: Methodsmentioning

confidence: 99%

Decomposition of Luminescent Hydroxyapatite Scaffolds in Simulated Body Fluid

Martinez-Pallares,

Herrera,

Graeve

2024

ACS Appl. Bio Mater.

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We present a luminescence study investigating the dissolution of rare-earth-doped hydroxyapatite scaffolds in simulated body fluid (SBF), aiming to assess the luminescence stability of Tb-, Ce-, and Eu-doped scaffolds over time. Our findings reveal a consistent decrease in luminescence emission intensity across all samples over a four-week period in which the scaffolds were immersed in the SBF. In addition, energy-dispersive spectroscopy confirms a decrease in rare-earth ion concentration in the scaffolds with respect to time, whereas fluorescence spectroscopy shows the presence of rare-earth ions in the SBF, indicating the partial dissolution of the scaffolds over time. The use of rareearth ions as luminescence markers provides insights into the mechanisms of apatite formation in hydroxyapatites. Thus, these scaffolds may find wider use in regenerative medicine, particularly in targeted drug delivery systems, where their luminescent properties have the potential to noninvasively track drug release.

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Section: Methodsmentioning

confidence: 99%

Decomposition of Luminescent Hydroxyapatite Scaffolds in Simulated Body Fluid

Martinez-Pallares,

Herrera,

Graeve

2024

ACS Appl. Bio Mater.

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“…These attributes hinder their practical applications, such as pixeled sensing and display. Therefore, alternative strategies, including physical vapor deposition [23,53,54] , ultrasonic spray pyrolysis [55] , combustion synthesis [56,57] , melt-quenching approach [58] , solution synthesis [26,59,60] , suppressed dissolution approach [61] , and molten salt shielded sintering [62,63] , have been developed. For example, biphasic ZnS ML microparticles have been synthesized using an in-air molten salt shielded sintering method, eliminating the need for grinding [Figure 2A] [63] .…”

Section: Synthesis Of ML Materialsmentioning

confidence: 99%

Soft devices empowered by mechanoluminescent materials

Wang,

Hu,

Peng

et al. 2023

Soft Sci

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Mechanoluminescence is the phenomenon in which certain materials emit light when subjected to mechanical stimuli, such as bending, stretching, or compression. Soft devices containing embedded mechanoluminescent materials are capable of responding to mechanical deformation by emitting light, which can be utilized for various applications, including sensing, display, communication, and visual feedback. In this Perspective, we discuss recent advancements and emerging applications of mechanoluminescent materials for soft devices, with a focus on the remaining challenges in mechanoluminescent materials, such as performance, mechanism, synthesis, and device fabrication, that need to be addressed for developing advanced soft devices, and propose the potential solutions.

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“…More recently, Wang et al reported two triboluminescence signals centered at 420 and 475 nm for ZnS crystals, attributing them to F S + centers (sulfur vacancies containing one trapped electron) and acceptor-type zinc vacancies, respectively. We recently reported the mechanoluminescence response of MgO powders, showing a pronounced signal because of the presence of two types of oxygen vacancies, namely, F and M centers.…”

Section: Introductionmentioning

confidence: 99%

“…More recently, Wang et al 17 reported two triboluminescence signals centered at 420 and 475 nm for ZnS crystals, attributing them to F S + centers (sulfur vacancies containing one trapped electron) and acceptor-type zinc vacancies, respectively. We recently reported the mechanoluminescence response of MgO powders, 18 showing a pronounced signal because of the presence of two types of oxygen vacancies, namely, F and M centers. Several researchers have found a triboluminescence response from barium hexacelsian, (BaAl 2 Si 2 O 8 , h−BAS), doped with small amounts of rare-earth ions (h−BAS:RE), including samarium, ytterbium, cerium, europium, 19,20 and dysprosium, 21 where the color of the emission can be adjusted by changing the type of rare-earth ion dopant, allowing control over the signal type such that emissions ranging anywhere from the red to the blue region of the electromagnetic spectrum can be achieved.…”

Section: Introductionmentioning

confidence: 99%

Barium Vacancies as the Origin of Triboluminescence in Hexacelsian Ceramics: An Ab Initio and Experimental Investigation

Novitskaya,

Amachraa,

Martínez-Pallares

et al. 2024

ACS Appl. Opt. Mater.

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We describe the triboluminescence response of undoped (BaAl 2 Si 2 O 8 , h−BAS) and Eu-doped (h−BAS:Eu) barium hexacelsian powders and show that the triboluminescence behavior is dependent on the formation of barium vacancies. X-ray photoelectron spectroscopy of the h−BAS:Eu powders confirms the presence of Eu 3+ and Eu 2+ in the compound, leading to the formation of significant vacancy point defects in excess of those found in h−BAS as a result of the charge imbalance caused by the substitution of Eu 3+ in Ba 2+ sites. From electron paramagnetic resonance measurements and density functional theory (DFT) calculations, we demonstrate that the vacancy defects correspond to singly ionized barium vacancies. DFT-calculated thermodynamic transitions and electronic structure calculations reveal deep energy levels within the compound's energy band gap, with a strong emission at 3.33 eV correlated to an electron exchange between the conduction band minimum and a barium vacancy center. Time-resolved triboluminescence spectra show that the increased concentration of barium vacancies in h−BAS:Eu enhances the signal by about 75% compared to the signal from h−BAS. These results play an important role in the understanding of fundamental mechanisms behind the triboluminescence response of ceramic materials as well as the role of different types of defects in this process.

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Effect of Oxygen Vacancies on the Mechanoluminescence Response of Magnesium Oxide

Cited by 6 publications

References 64 publications

Decomposition of Luminescent Hydroxyapatite Scaffolds in Simulated Body Fluid

Decomposition of Luminescent Hydroxyapatite Scaffolds in Simulated Body Fluid

Soft devices empowered by mechanoluminescent materials

Barium Vacancies as the Origin of Triboluminescence in Hexacelsian Ceramics: An Ab Initio and Experimental Investigation

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