Electron–Phonon Coupling in Luminescent ...
Type de document :
Article dans une revue scientifique
DOI :
URL permanente :
Titre :
Electron–Phonon Coupling in Luminescent Europium-Doped Hydride Perovskites Studied by Luminescence Spectroscopy, Inelastic Neutron Scattering, and First-Principles Calculations
Auteur(s) :
Lefevre, Gauthier [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Herfurth, Alexander [Auteur]
Kohlmann, Holger [Auteur]
SAYEDE, Adlane [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
UCCS Équipe Couches Minces & Nanomatériaux
Wylezich, Thomas [Auteur]
Welinski, Sacha [Auteur]
Duarte Vaz, Pedro [Auteur]
Parker, Stewart F. [Auteur]
Blach, Jean-Francois [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
UCCS Équipe Couches Minces & Nanomatériaux
Goldner, Philippe [Auteur]
Kunkel, Nathalie [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Herfurth, Alexander [Auteur]
Kohlmann, Holger [Auteur]
SAYEDE, Adlane [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
UCCS Équipe Couches Minces & Nanomatériaux
Wylezich, Thomas [Auteur]
Welinski, Sacha [Auteur]
Duarte Vaz, Pedro [Auteur]
Parker, Stewart F. [Auteur]
Blach, Jean-Francois [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
UCCS Équipe Couches Minces & Nanomatériaux
Goldner, Philippe [Auteur]
Kunkel, Nathalie [Auteur]
Titre de la revue :
The Journal of Physical Chemistry C
Nom court de la revue :
J. Phys. Chem. C
Numéro :
122
Pagination :
10501-10509
Éditeur :
ACS
Date de publication :
2018-04-17
Mot(s)-clé(s) en anglais :
Phonons
Anions
Oscillation
Energy
Optics
Anions
Oscillation
Energy
Optics
Discipline(s) HAL :
Chimie/Chimie inorganique
Résumé en anglais : [en]
We present a case study on the vibrational coupling of lattice phonons to the electronic 4f7 (8S7/2)–4f65d1 (eg) transition of divalent europium in the hydrides and deuterides LiMH3 and LiMD3 (M = Sr and Ba). For low doping ...
Lire la suite >We present a case study on the vibrational coupling of lattice phonons to the electronic 4f7 (8S7/2)–4f65d1 (eg) transition of divalent europium in the hydrides and deuterides LiMH3 and LiMD3 (M = Sr and Ba). For low doping concentrations, these compounds show extraordinarily well-resolved vibronic fine structures at low temperatures. Besides luminescence emission spectroscopy of the europium-doped compounds, we carried out inelastic neutron scattering (INS) experiments of the europium-free compounds. The phonons coupling to the electronic transition are identified, and a good agreement between the vibronic and the INS data is found. The frequencies of the low-energy acoustic modes do not significantly change upon replacing hydride by deuteride, whereas a decrease by a factor of approximately can be observed for the higher energy optic modes. Furthermore, we compare these experimental results to density functional calculations performed with the Vienna Ab initio Simulation Package. Knowledge of the phonons of a host material is of great importance because phonons have a large influence on the optical properties, such as line widths or luminescence quenching. Hydride-containing host lattices are an ideal model system because 1H can easily be replaced by 2D so that isotope effects can be investigated.Lire moins >
Lire la suite >We present a case study on the vibrational coupling of lattice phonons to the electronic 4f7 (8S7/2)–4f65d1 (eg) transition of divalent europium in the hydrides and deuterides LiMH3 and LiMD3 (M = Sr and Ba). For low doping concentrations, these compounds show extraordinarily well-resolved vibronic fine structures at low temperatures. Besides luminescence emission spectroscopy of the europium-doped compounds, we carried out inelastic neutron scattering (INS) experiments of the europium-free compounds. The phonons coupling to the electronic transition are identified, and a good agreement between the vibronic and the INS data is found. The frequencies of the low-energy acoustic modes do not significantly change upon replacing hydride by deuteride, whereas a decrease by a factor of approximately can be observed for the higher energy optic modes. Furthermore, we compare these experimental results to density functional calculations performed with the Vienna Ab initio Simulation Package. Knowledge of the phonons of a host material is of great importance because phonons have a large influence on the optical properties, such as line widths or luminescence quenching. Hydride-containing host lattices are an ideal model system because 1H can easily be replaced by 2D so that isotope effects can be investigated.Lire moins >
Langue :
Anglais
Comité de lecture :
Oui
Audience :
Internationale
Vulgarisation :
Non
Établissement(s) :
ENSCL
CNRS
Centrale Lille
Univ. Artois
Université de Lille
CNRS
Centrale Lille
Univ. Artois
Université de Lille
Collections :
Équipe(s) de recherche :
Couches minces & nanomatériaux (CMNM)
Date de dépôt :
2019-09-25T14:37:58Z
2021-03-16T14:55:39Z
2021-03-16T14:55:39Z