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Liu S, Li L, Qin X, Du R, Sun Y, Xie S, Wang J, Molokeev MS, Xi S, Bünzli JCG, Zhou L, Wu M. Achieving Ultra-Broadband Sunlight-Like Emission in Single-Phase Phosphors: The Interplay of Structure and Luminescence. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024:e2406164. [PMID: 38924614 DOI: 10.1002/adma.202406164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2024] [Revised: 06/13/2024] [Indexed: 06/28/2024]
Abstract
The quest for artificial light sources mimicking sunlight has been a long-standing endeavor, particularly for applications in anticounterfeiting, agriculture, and color hue detection. Conventional sunlight simulators are often cost-prohibitive and bulky. Therefore, the development of a series of single-phase phosphors Ca9LiMg1-xAl2x/3(PO4)7:0.1Eu2+ (x = 0-0.75) with sunlight-like emission represents a welcome step towards compact and economical light source alternatives. The phosphors are obtained by an original heterovalent substitution method and emit a broad spectrum spanning from violet to deep red. Notably, the phosphor with x = 0.5 exhibits an impressive full width at half-maximum of 330 nm. A synergistic interplay of experimental investigations and theory unveils the mechanism behind sunlight-like emission due to the local structural perturbations introduced by the heterovalent substitution of Al3+ for Mg2+, leading to a varied distribution of Eu2+ within the lattice. Subsequent characterization of a series of organic dyes combining absorption spectroscopy with convolutional neural network analysis convincingly demonstrates the potential of this phosphor in portable photodetection devices. Broad-spectrum light source testing empowers the model to precisely differentiate dye patterns. This points to the phosphor being ideal for mimicking sunlight. Beyond this demonstrated application, the phosphor's utility is envisioned in other relevant domains, including visible light communication and smart agriculture.
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Affiliation(s)
- Shuifu Liu
- School of Chemical Engineering and Technology/School of Marine Sciences, Sun Yat-sen University, Zhuhai, 519082, P. R. China
- College of Materials, Xiamen University, Xiamen, 361005, P. R. China
| | - Liyi Li
- School of Chemical Engineering and Technology/School of Marine Sciences, Sun Yat-sen University, Zhuhai, 519082, P. R. China
| | - Xinghui Qin
- School of Chemical Engineering and Technology/School of Marine Sciences, Sun Yat-sen University, Zhuhai, 519082, P. R. China
| | - Rongkai Du
- School of Chemical Engineering and Technology/School of Marine Sciences, Sun Yat-sen University, Zhuhai, 519082, P. R. China
| | - Yifan Sun
- School of Chemical Engineering and Technology/School of Marine Sciences, Sun Yat-sen University, Zhuhai, 519082, P. R. China
| | - Shixing Xie
- School of Chemical Engineering and Technology/School of Marine Sciences, Sun Yat-sen University, Zhuhai, 519082, P. R. China
| | - Jiaqi Wang
- School of Chemical Engineering and Technology/School of Marine Sciences, Sun Yat-sen University, Zhuhai, 519082, P. R. China
| | - Maxim S Molokeev
- Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center, SB RAS, Akademgorodok 50 bld.38, Krasnoyarsk, 660036, Russia
- International Research Center of Spectroscopy and Quantum Chemistry-IRC SQC, Siberian Federal University, 79 Svobodny Ave, Krasnoyarsk, 660041, Russia
| | - Shibo Xi
- Institute of Sustainability for Chemicals, Energy and Environment (ISCE2) Agency for Science, Technology and Research (A*STAR), 1 Pesek Road, Jurong Island, 627833, Singapore
| | - Jean-Claude G Bünzli
- Institute of Chemical Sciences and Engineering, Swiss Federal Institute of Technology, Lausanne (EPFL), Lausanne, Switzerland
| | - Lei Zhou
- School of Chemical Engineering and Technology/School of Marine Sciences, Sun Yat-sen University, Zhuhai, 519082, P. R. China
| | - Mingmei Wu
- School of Chemical Engineering and Technology/School of Marine Sciences, Sun Yat-sen University, Zhuhai, 519082, P. R. China
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Straub LC, Adlung M, Wickleder C, Wickleder MS, Rasche B. Impact of 1,10-Phenanthroline-Induced Intermediate Valence on the Luminesence of Divalent Europium Halides. Inorg Chem 2023; 62:497-507. [PMID: 36563288 DOI: 10.1021/acs.inorgchem.2c03647] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Starting from EuX2 (X = Cl, Br, I), we systematically investigated a variety of divalent europium complexes containing bidentate 1,10-phenanthroline (Phen) ligands. Depending on the Eu/Phen ratio, mono-, di-, and polynuclear complexes are formed, with the latter yielding one-dimensional ∞1[EuBr2(phen)] chains. Seven new divalent europium complexes, [Eu(phen)4(H2O)]Br2·2MeCN, [Eu(phen)4]I2·1.7Tol, [EuBr(phen)3]2Br2·4MeCN, [EuCl2(phen)2]2·2MeCN, [EuBr2(phen)2]2, [EuI2(phen)2]2, and [EuBr2(phen)]x, are presented in this work. All species show remarkable optical properties based on a partial electron transfer from the EuII center to the Phen ligand. The photophysical characterization is further supported by electrochemistry studies in order to describe the intermediate valence of the Eu center.
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Affiliation(s)
- Laura C Straub
- Institute of Inorganic Chemistry, University of Cologne, Greinstraße 6, Cologne 50939, Germany
| | - Matthias Adlung
- Institute of Inorganic Chemistry, University of Siegen, Adolf-Reichwein-Straße 2, Siegen 57068, Germany
| | - Claudia Wickleder
- Institute of Inorganic Chemistry, University of Siegen, Adolf-Reichwein-Straße 2, Siegen 57068, Germany
| | - Mathias S Wickleder
- Institute of Inorganic Chemistry, University of Cologne, Greinstraße 6, Cologne 50939, Germany
| | - Bertold Rasche
- Institute of Inorganic Chemistry, University of Cologne, Greinstraße 6, Cologne 50939, Germany
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Chen Q, Liu M, Shang L, Duan CK. Elucidating the Multisite and Multivalence Nature of Mn Ions in Solids and Predicting Their Optical Transition Properties: A Case Study on a Series of Garnet Hosts. Inorg Chem 2022; 61:18690-18700. [DOI: 10.1021/acs.inorgchem.2c03175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Qiaoling Chen
- CAS Key Laboratory of Microscale Magnetic Resonance, and School of Physical Sciences, University of Science and Technology of China, Hefei230026, China
- CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei230026, China
| | - Mingzhe Liu
- CAS Key Laboratory of Microscale Magnetic Resonance, and School of Physical Sciences, University of Science and Technology of China, Hefei230026, China
- CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei230026, China
| | - Longbing Shang
- CAS Key Laboratory of Microscale Magnetic Resonance, and School of Physical Sciences, University of Science and Technology of China, Hefei230026, China
- CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei230026, China
| | - Chang-Kui Duan
- CAS Key Laboratory of Microscale Magnetic Resonance, and School of Physical Sciences, University of Science and Technology of China, Hefei230026, China
- CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei230026, China
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Abstract
The number of rare earth (RE) starting materials used in synthesis is staggering, ranging from simple binary metal-halide salts to borohydrides and "designer reagents" such as alkyl and organoaluminate complexes. This review collates the most important starting materials used in RE synthetic chemistry, including essential information on their preparations and uses in modern synthetic methodologies. The review is divided by starting material category and supporting ligands (i.e., metals as synthetic precursors, halides, borohydrides, nitrogen donors, oxygen donors, triflates, and organometallic reagents), and in each section relevant synthetic methodologies and applications are discussed.
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Affiliation(s)
- Fabrizio Ortu
- School of Chemistry, University of Leicester, LE1 7RH Leicester, U.K.
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Kim D. Recent Developments in Lanthanide-Doped Alkaline Earth Aluminate Phosphors with Enhanced and Long-Persistent Luminescence. NANOMATERIALS 2021; 11:nano11030723. [PMID: 33805631 PMCID: PMC8001515 DOI: 10.3390/nano11030723] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Revised: 03/06/2021] [Accepted: 03/09/2021] [Indexed: 12/22/2022]
Abstract
Lanthanide-activated alkaline earth aluminate phosphors are excellent luminescent materials that are designed to overcome the limitations of conventional sulfide-based phosphors. The increasing research attention on these phosphors over the past decade has led to a drastic improvement in their phosphorescence efficiencies and resulted in a wide variety of phosphorescence colors, which can facilitate applications in various areas. This review article discusses the development of lanthanide-activated alkaline earth aluminate phosphors with a focus on the various synthesis methods, persistent luminescence mechanisms, activator and coactivator effects, and the effects of compositions. Particular attention has been devoted to alkaline earth aluminate phosphors that are extensively used, such as strontium-, calcium-, and barium-based aluminates. The role of lanthanide ions as activators and coactivators in phosphorescence emissions was also emphasized. Finally, we address recent techniques involving nanomaterial engineering that have also produced lanthanide-activated alkaline earth aluminate phosphors with long-persistent luminescence.
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Affiliation(s)
- Doory Kim
- Department of Chemistry, Hanyang University, Seoul 04763, Korea;
- Research Institute for Convergence of Basic Sciences, Hanyang University, Seoul 04763, Korea
- Institute of Nano Science and Technology, Hanyang University, Seoul 04763, Korea
- Research Institute for Natural Sciences, Hanyang University, Seoul 04763, Korea
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Suta M, Lavoie‐Cardinal F, Wickleder C. Underestimated Color Centers: Defects as Useful Reducing Agents in Lanthanide-Activated Luminescent Materials. Angew Chem Int Ed Engl 2020; 59:10949-10954. [PMID: 32147942 PMCID: PMC7318186 DOI: 10.1002/anie.202002009] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Indexed: 02/02/2023]
Abstract
Inorganic hosts, such as SrB4 O7 or certain nitrides, intrinsically stabilize Eu2+ even when the dopant is an Eu3+ -based precursor and reducing conditions are not employed in the synthesis. Although this concept is well known in the synthesis of phosphorescent materials, the mechanistic details are scarcely understood. Herein, we demonstrate that trapped charge carriers, such as color centers, can also act as redox partners to stabilize certain oxidation states of activators. Eu-activated CsMgCl3 and CsMgBr3 are used as examples. Upon doping with EuCl3 and in the absence of reducing conditions during the synthesis, dominant cyan or green luminescence from Eu2+ ions was observed. Photoluminescence spectroscopy at 10 K revealed that the reduction is correlated to color centers localized at defects. Although defects are typically undesired in phosphors, we have shown that their role may be underestimated and they could be used on purpose in the preparation of selected inorganic phosphors.
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Affiliation(s)
- Markus Suta
- Inorganic ChemistryDepartment of ChemistryFaculty of Science & TechnologyUniversity of SiegenAdolf-Reichwein-Strasse 257068SiegenGermany
- Current address: Condensed Matter and InterfacesDebye Institute for Nanomaterials ScienceDepartment of ChemistryUtrecht UniversityPrincetonplein 13584 CCUtrechtThe Netherlands
| | - Flavie Lavoie‐Cardinal
- Inorganic ChemistryDepartment of ChemistryFaculty of Science & TechnologyUniversity of SiegenAdolf-Reichwein-Strasse 257068SiegenGermany
- Current address: CERVO Brain Research Center2601 de la CanardièreQuébecQCGIJ 2G3Canada
| | - Claudia Wickleder
- Inorganic ChemistryDepartment of ChemistryFaculty of Science & TechnologyUniversity of SiegenAdolf-Reichwein-Strasse 257068SiegenGermany
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