The crucial impact of cerium reduction on photoluminescence
| Autor: | Florian Massuyeau, Romain Gautier, Romain Génois, Guy Ouvrard, Stéphane Jobic |
|---|---|
| Přispěvatelé: | Institut des Matériaux Jean Rouxel (IMN), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Ecole Polytechnique de l'Université de Nantes (EPUN), Université de Nantes (UN)-Université de Nantes (UN) |
| Rok vydání: | 2020 |
| Předmět: |
Photoluminescence
Materials science Dopant Reducing atmosphere chemistry.chemical_element Phosphor 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences 0104 chemical sciences Cerium chemistry Activator (phosphor) [CHIM]Chemical Sciences General Materials Science Diffuse reflection 0210 nano-technology Luminescence ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Applied Materials Today Applied Materials Today, Elsevier, 2020, 20, pp.100643. ⟨10.1016/j.apmt.2020.100643⟩ |
| ISSN: | 2352-9407 |
| Popis: | 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 Ce3+/Ce4+ ratio on the materials optical properties. As an example, different CaSc2O4:Ce samples were prepared and their Ce3+/Ce4+ ratios were probed by diffuse reflection and XANES. The evolution of their photoluminescence properties was investigated to rationalize the progressive reduction of dopants. |
| Databáze: | OpenAIRE |
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