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

Abstract

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.

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

“…[ 7–9 ] While facing these challenges, one of the most interesting factors that is mostly overlooked in transition metal‐based SACs is the effect of the oxidation states of the metal atom centers in the precursors. [ 10 ] Despite numerous reports on Fe/N/C‐type catalysts, an in‐depth assessment for the development of a versatile strategy is still required for tuning the kinetic activity of a single FeN 4 site. [ 11 ]…”

“…[7][8][9] While facing these challenges, one of the most interesting factors that is mostly overlooked in transition metal-based SACs is the effect of the oxidation states of the metal atom centers in the precursors. [10] Despite numerous reports on Fe/N/C-type catalysts, an in-depth assessment for the development of a versatile strategy is still required for tuning the kinetic activity of a single FeN 4 site. [11] However, it has been established that mixed-valence states in nanomaterials coordinating environment exhibit extraordinarily high catalytic efficiencies due to the synergism among oxidation states.…”

“…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 ).…”

Development, Characterization and Valuable Use of Novel Dosimeter Film Based on PVA Polymer Doped Nitro Blue Tetrazolium Dye and AgNO3 for the Accurate Detection of Low X-ray Doses

“…Recent advances in the field of dosimetry through the development of photographic films, Geiger-Muller and proportional counters have experienced continuous and rapid progress [ 15 , 16 ]. The investigation of solutions as standards, as well as the variation in oxidation states and color changes, have been extensively studied [ 17 , 18 ]. However, specific manipulations in addition to heavy and expensive instrumentation such as NMR, IR, UV-Vis spectrophotometer, ESR and thermoluminescence are quite necessary for the detection of changes in these solutions.…”

Enhanced Photoluminescence Properties of BaAl2O4: Ce3+/Li+ Yellow Phosphors

“…al., Mn doped BaAl 2 O 4 's emission color was investigated and it was found that by changing the concentration of the Mn as co-dopant ion, the emission color can be tuned [8]. Researchers observed an enhancement in the luminescence properties of phosphors by doping with Li + ions in order to stabilize the oxidation state of dopant, thereby increasing the luminescence properties [9]. To enhance the luminescence intensity of SrAl 2 O 4 :Eu 3+ , B 3+ phosphors, Li + dopant was used as a charge compensator.…”