Origin of Luminescence in La 2 MoO 6 and La 2 Mo 2 O 9 and Their Bi-Doped Variants
| Autor: | Anastasiya Zadoya, Marie Colmont, Philippe Boutinaud, Camille Latouche, Stéphane Jobic, Florian Massuyeau, Marielle Huvé |
|---|---|
| Přispěvatelé: | Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), Centrale Lille Institut (CLIL)-Université d'Artois (UA)-Centrale Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Lille, Institut de Chimie de Clermont-Ferrand (ICCF), SIGMA Clermont (SIGMA Clermont)-Institut de Chimie du CNRS (INC)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS), 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), Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Université de Nantes (UN)-Université de Nantes (UN)-Ecole Polytechnique de l'Université de Nantes (EPUN), Université de Nantes (UN)-Université de Nantes (UN)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), CNRS, Centrale Lille, ENSCL, Univ. Artois, Université de Lille, Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181 |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Quenching
Dopant 010405 organic chemistry Doping chemistry.chemical_element Phosphor [CHIM.MATE]Chemical Sciences/Material chemistry [CHIM.INOR]Chemical Sciences/Inorganic chemistry 010402 general chemistry 01 natural sciences 0104 chemical sciences Bismuth Inorganic Chemistry Crystallography chemistry Ab initio quantum chemistry methods Lanthanum Physical and Theoretical Chemistry Luminescence |
| Zdroj: | Inorganic Chemistry Inorganic Chemistry, American Chemical Society, 2020, 59 (5), pp.3215-3220. ⟨10.1021/acs.inorgchem.9b03580⟩ Inorganic Chemistry, 2020, 59 (5), pp.3215-3220. ⟨10.1021/acs.inorgchem.9b03580⟩ |
| ISSN: | 0020-1669 1520-510X |
| Popis: | International audience; In this article, lanthanum molybdenum oxides (La2MoO6 and La2Mo2O9) and their Bi-doped derivatives were investigated as potential rare-earth-free phosphors. An X-ray diffraction analysis coupled with an EDX study confirmed the purity of the samples and the insertion of bismuth in a 1 molar % amount. Kubelka–Munk-transformed reflectance spectra clearly indicated that the insertion of Bi induces a shortening of the optical gap in La2MoO6 but has no impact on that of La2Mo2O9. Moreover, excitation and emission spectra evidenced a strong temperature quenching effect in all materials. Also, the CIEx,y parameters at 77 K are almost identical with or without Bi doping for the two host lattices. Clearly, it was shown, by combining experimental data, ab initio calculations, and the empirical positioning of absorption bands that the luminescence of the Bi-doped La2MoO6 sample is mainly related to the host lattice itself and distortions induced by La/Bi substitution. The role of the Bi3+ dopant is indirect, and the luminescence is mainly due to a Mo–O charge transfer rather than an on-site Bi3+3P1,0 → 1S0 transition. Concerning La2Mo2O9, there is no effect following the insertion of Bi, implying that the role of Bi is insignificant. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|