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Kannengießer N, Jähnig M, Kremer RK, Glaum R. Understanding Optical Absorption Spectra and Magnetic Behavior of a Wide Range of Samarium(III) Oxo‐Compounds: Analysis of the Ligand‐Field Effects. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202001115] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Nils Kannengießer
- Institute of Inorganic Chemistry Rheinische Friedrich-Wilhelms-Universität Gerhard-Domagk-Straße 1 53121 Bonn Germany
| | - Maximilian Jähnig
- Institute of Inorganic Chemistry Rheinische Friedrich-Wilhelms-Universität Gerhard-Domagk-Straße 1 53121 Bonn Germany
| | - Reinhard K. Kremer
- Max-Planck-Institut für Festkörperforschung Heisenbergstraße 1 70569 Stuttgart Germany
| | - Robert Glaum
- Institute of Inorganic Chemistry Rheinische Friedrich-Wilhelms-Universität Gerhard-Domagk-Straße 1 53121 Bonn Germany
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García-Fuente A, Baur F, Cimpoesu F, Vega A, Jüstel T, Urland W. Properties Design: Prediction and Experimental Validation of the Luminescence Properties of a New Eu II -Based Phosphor. Chemistry 2018; 24:16276-16281. [PMID: 30198117 DOI: 10.1002/chem.201804479] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Indexed: 11/06/2022]
Abstract
A theoretical model that allows to predict, for the first time, the luminescence properties of a new phosphor (BaSnSi3 O9 :Eu2+ ) is presented. The predicted emission wavelength, 488 nm with a 64 nm bandwidth, was confirmed by subsequent experimental work. The method consists in a multi-electron Hamiltonian parametrized from ab initio calculations. The luminescence properties of other similar compounds (i.e., BaHfSi3 O9 :Eu2+ and BaZrSi3 O9 :Eu2+ ), for which there is already experimental information, were also correctly reproduced.
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Affiliation(s)
| | - Florian Baur
- Department of Chemical Engineering, Münster University of Applied Sciences, 48565, Steinfurt, Germany
| | | | - Andrés Vega
- Departamento de Física Teórica, AtómicayÓptica, Universidad de Valladolid, 47011, Valladolid, Spain
| | - Thomas Jüstel
- Department of Chemical Engineering, Münster University of Applied Sciences, 48565, Steinfurt, Germany
| | - Werner Urland
- Private Institute of Theoretical Chemical Physics, 6600, Muralto, Switzerland
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Effect of Low Spin Excited States for Magnetic Anisotropy of Transition Metal Mononuclear Single Molecule Magnets. INORGANICS 2018. [DOI: 10.3390/inorganics6010024] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Rational, fine tuning of magnetic anisotropy is critical to obtain new coordination compounds with enhanced single molecule magnet properties. For mononuclear transition metal complexes, the largest contribution to zero-field splitting is usually related to the excited states of the same spin as the ground level. Thus, the contribution of lower multiplicity roots tends to be overlooked due to its lower magnitude. In this article, we explore the role of lower multiplicity excited states in zero-field splitting parameters in model structures of Fe(II) and Co(II). Model aquo complexes with coordination numbers ranging from 2 to 6 were constructed. The magnetic anisotropy was calculated by state of the art ab initio methodologies, including spin-orbit coupling effects. For non-degenerate ground states, contributions to the zero-field splitting parameter (D) from highest and lower multiplicity roots were of the same sign. In addition, their relative magnitude was in a relatively narrow range, irrespective of the coordination geometry. For degenerate ground states, the contribution from lower multiplicity roots was significantly smaller. Results are rationalized in terms of general expressions for D and are expected to be reasonably transferable to real molecular systems.
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Bronova A, Bredow T, Glaum R, Riley MJ, Urland W. BonnMag: Computer program for ligand-field analysis off nsystems within the angular overlap model. J Comput Chem 2017; 39:176-186. [DOI: 10.1002/jcc.25096] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2017] [Revised: 10/12/2017] [Accepted: 10/16/2017] [Indexed: 01/20/2023]
Affiliation(s)
- Anna Bronova
- Institute of Inorganic Chemistry, Rheinische Friedrich-Wilhelms-Universität, Gerhard-Domagk-Straße 1; Bonn D-53121 Germany
| | - Thomas Bredow
- Mulliken Center for Theoretical Chemistry, Rheinische Friedrich-Wilhelms-Universität, Beringstr. 4; Bonn D-53121 Germany
| | - Robert Glaum
- Institute of Inorganic Chemistry, Rheinische Friedrich-Wilhelms-Universität, Gerhard-Domagk-Straße 1; Bonn D-53121 Germany
| | - Mark J. Riley
- School of Chemistry and Molecular Biosciences; University of Queensland, Brisbane St. Lucia; QLD 4072 Australia
| | - Werner Urland
- Private Institute of Theoretical Chemical Physics, Via Dr. A. Sciarone Nr. 2; Muralto CH-6600 Switzerland
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Suta M, Urland W, Daul C, Wickleder C. Photoluminescence properties of Yb2+ ions doped in the perovskites CsCaX3 and CsSrX3 (X = Cl, Br, and I) – a comparative study. Phys Chem Chem Phys 2016; 18:13196-208. [DOI: 10.1039/c6cp00085a] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Photoluminescence spectra of Yb2+ ions doped into CsCaX3 and CsSrX3 (X = Cl, Br, and I) depict a manifold of transitions in high resolution, which allows a detailed understanding of the optical properties of divalent lanthanide ions in perovskite host lattices.
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Affiliation(s)
- Markus Suta
- Inorganic Chemistry
- Faculty of Science and Technology
- University of Siegen
- 57068 Siegen
- Germany
| | - Werner Urland
- Department of Chemistry
- University of Fribourg
- 1700 Fribourg
- Switzerland
| | - Claude Daul
- Department of Chemistry
- University of Fribourg
- 1700 Fribourg
- Switzerland
| | - Claudia Wickleder
- Inorganic Chemistry
- Faculty of Science and Technology
- University of Siegen
- 57068 Siegen
- Germany
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Ramanantoanina H, Cimpoesu F, Göttel C, Sahnoun M, Herden B, Suta M, Wickleder C, Urland W, Daul C. Prospecting Lighting Applications with Ligand Field Tools and Density Functional Theory: A First-Principles Account of the 4f(7)-4f(6)5d(1) Luminescence of CsMgBr3:Eu(2+). Inorg Chem 2015; 54:8319-26. [PMID: 26270436 DOI: 10.1021/acs.inorgchem.5b00988] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The most efficient way to provide domestic lighting nowadays is by light-emitting diodes (LEDs) technology combined with phosphors shifting the blue and UV emission toward a desirable sunlight spectrum. A route in the quest for warm-white light goes toward the discovery and tuning of the lanthanide-based phosphors, a difficult task, in experimental and technical respects. A proper theoretical approach, which is also complicated at the conceptual level and in computing efforts, is however a profitable complement, offering valuable structure-property rationale as a guideline in the search of the best materials. The Eu(2+)-based systems are the prototypes for ideal phosphors, exhibiting a wide range of visible light emission. Using the ligand field concepts in conjunction with density functional theory (DFT), conducted in nonroutine manner, we develop a nonempirical procedure to investigate the 4f(7)-4f(6)5d(1) luminescence of Eu(2+) in the environment of arbitrary ligands, applied here on the CsMgBr3:Eu(2+)-doped material. Providing a salient methodology for the extraction of the relevant ligand field and related parameters from DFT calculations and encompassing the bottleneck of handling large matrices in a model Hamiltonian based on the whole set of 33,462 states, we obtained an excellent match with the experimental spectrum, from first-principles, without any fit or adjustment. This proves that the ligand field density functional theory methodology can be used in the assessment of new materials and rational property design.
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Affiliation(s)
- Harry Ramanantoanina
- Department of Chemistry, University of Fribourg , Chemin du Musée 9, 1700 Fribourg, Switzerland
| | - Fanica Cimpoesu
- Institute of Physical Chemistry , Splaiul Independentei 202, Bucharest 060021, Romania
| | - Christian Göttel
- Department of Chemistry, University of Fribourg , Chemin du Musée 9, 1700 Fribourg, Switzerland
| | - Mohammed Sahnoun
- Laboratoire de physique de la matière et modélisation mathématique LPQ3M, Université de Mascara , Mascara, Algerie
| | - Benjamin Herden
- Department of Chemistry, University of Fribourg , Chemin du Musée 9, 1700 Fribourg, Switzerland
| | - Markus Suta
- Faculty of Science and Technology, University of Siegen , Adolf-Reichwein Strasse 2, 57068 Siegen, Germany
| | - Claudia Wickleder
- Faculty of Science and Technology, University of Siegen , Adolf-Reichwein Strasse 2, 57068 Siegen, Germany
| | - Werner Urland
- Department of Chemistry, University of Fribourg , Chemin du Musée 9, 1700 Fribourg, Switzerland
| | - Claude Daul
- Department of Chemistry, University of Fribourg , Chemin du Musée 9, 1700 Fribourg, Switzerland
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