Fine‐Tuning the Properties of Doped Multifunctional Materials by Controlled Reduction of Dopants

Barroux, Hugo; Jiang, Tengfei; Paul, Camille; Massuyeau, Florian; Génois, Romain; Gordon, Elijah E.; Whangbo, Myung‐Hwan; Jobic, Stéphane; Gautier, Romain

doi:10.1002/chem.201605707

Cited by 6 publications

(5 citation statements)

References 30 publications

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“…CaH 2 , NaH, LiH) as reducing agent [9,[37][38][39] . This method can be implemented after material synthesis if the dopants are the only reducible elements in the material.…”

Section: Gradual Reduction/oxidation Of Dopants Controlled By Temperamentioning

confidence: 99%

“…Controlled reduction of dopant can also be performed using oxygen getter such as hydrides (e.g. CaH 2 , NaH, LiH) as reducing agent [9, 37–39] . This method can be implemented after material synthesis if the dopants are the only reducible elements in the material.…”

Section: Approaches For the Design Of Materials With Dual Valence Statesmentioning

confidence: 99%

“…CaH 2 ,N aH, LiH) as reducing agent. [9,[37][38][39] This method can be implementedafter material synthesis if the dopantsa re the only reducible elements in the material. It consists in the thermally activated disinsertion of oxygen from the crystal structure of the phosphor.…”

Section: Gradualreduction/oxidation Of Dopantsc Ontrolled By Temperaturementioning

confidence: 99%

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Tuning the Oxidation States of Dopants: A Strategy for the Modulation of Material Photoluminescence Properties

Glais

Massuyeau

Gautier

2020

Chemistry A European J

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Doped single-phase materials have been widely investigated owing to their easy to implement synthesis and the variety of their properties. This minireview covers strategies for the costabilization and the ratio control of several oxidation states of dopants inserted in the same host. The tuning of the oxidation states of dopants opens up many possibilities for the optimization of specific properties and can be envisioned for various applications such as telecommunication, medicine, display, lasers or lighting. Technics used for the quantification of each valence state of dopant are also emphasized, and the importance of high throughput methods for the discovery of competitive materials with dopant in multiple valence states is discussed.

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“…CaH 2 , NaH, LiH) as reducing agent [9,[37][38][39] . This method can be implemented after material synthesis if the dopants are the only reducible elements in the material.…”

Section: Gradual Reduction/oxidation Of Dopants Controlled By Temperamentioning

confidence: 99%

Section: Approaches For the Design Of Materials With Dual Valence Statesmentioning

confidence: 99%

See 1 more Smart Citation

Tuning the Oxidation States of Dopants: A Strategy for the Modulation of Material Photoluminescence Properties

Glais

Massuyeau

Gautier

2020

Chemistry A European J

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“…In fact, the simplest method to control the oxidation states in SACs that is mostly considered is through precise control of synthesis temperature and atmosphere. [10,17] Extreme reducing or oxidizing atmospheres such as H 2 or O 2 might result in either a single oxidation state or the formation of metallic and metal oxide nanoparticles instead of single-atoms. Therefore, most of the time the synthesis of SACs is carried out under inert atmospheres (Ar or N 2 ).…”

Section: Introductionmentioning

confidence: 99%

Engineering at Subatomic Scale: Achieving Selective Catalytic Pathways via Tuning of the Oxidation States in Functionalized Single‐Atom Quantum Catalysts

Zeb

Sahar

et al. 2022

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Regulating the catalytic pathways of single‐atom sites in single atom catalysts (SACs) is an exciting debate at the moment, which has redirected the research towards understanding and modifying the single‐atom catalytic sites through various strategies including altering the coordination environment of single atom for desirable outcomes as well as increasing their number. One useful aspect concerning the tunability of the catalytic pathways of SACs, which has been overlooked, is the oxidation state dynamics of the single atoms. In this study, iron single‐atoms (FeSA) with variable oxidation states, dependent on the precursors, are harnessed inside a nitrogen‐rich functionalized carbon quantum dots (CQDs) matrix via a facile one‐step and low‐temperature synthesis process. Dynamic electronic properties are imparted to the FeSAs by the simpler carbon dots matrix of CQDs in order to achieve the desired catalytic pathways of reactive oxygen species (ROS) generation in different environments, which are explored experimentally and theoretically for an in‐depth understanding of the redox chemistry that drives the alternative catalytic pathways in FeSA@CQDs. These alternative and oxidation state‐dependent catalytic pathways are employed for specific as well as cascade‐like activities simulating natural enzymes as well as biomarkers for the detection of cancerous cells.

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“…[10] , [11] Furthermore, the stabilization of several oxidation states by soft reduction routes has been referenced to allow luminescence or absorption tuning. [12][13][14] Therefore, an overall question remains open on the properties reproducibility if full reduction under strong conditions is not reached. In this context, in order to investigate partial reduction more thoroughly, we propose here the study of CaSc 2 O 4 :Ce and the impact of the Ce 3+ ratio (percentage of Ce 3+ over the whole cerium amount) on the material photoluminescence properties.…”

Section: Introductionmentioning

confidence: 99%

The crucial impact of cerium reduction on photoluminescence

Génois

Jobic

Ouvrard

et al. 2020

Applied Materials Today

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Rare earth-based inorganic phosphors are of great interest for solid-state lighting because some of them present very efficient luminescence properties. However, their performances strongly depend on several parameters. For multivalent dopants such as cerium, a widely used activator in the lighting industry, a synthesis in reducing atmosphere is often required to stabilize the dopant in its lower oxidation state. Surprisingly, this crucial step is not much considered, and the presence of the reduced state only is often assumed. However, the presence of the dopants oxidized form has been previously evidenced after such reductions. In this case, a question remains open about the impact of the Ce 3+ /Ce 4+ ratio on the materials optical properties. As an example, different CaSc 2 O 4 :Ce samples were prepared and their Ce 3+ /Ce 4+ ratios were probed by diffuse reflection and XANES. The evolution of their photoluminescence properties was investigated to rationalize the progressive reduction of dopants.

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Fine‐Tuning the Properties of Doped Multifunctional Materials by Controlled Reduction of Dopants

Cited by 6 publications

References 30 publications

Tuning the Oxidation States of Dopants: A Strategy for the Modulation of Material Photoluminescence Properties

Tuning the Oxidation States of Dopants: A Strategy for the Modulation of Material Photoluminescence Properties

Engineering at Subatomic Scale: Achieving Selective Catalytic Pathways via Tuning of the Oxidation States in Functionalized Single‐Atom Quantum Catalysts

The crucial impact of cerium reduction on photoluminescence

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