1
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Peng W, Hu R, Yang B, Wu Q, Liang P, Cheng L, Cheng X, Li Y, Zou J. Solution-grown millimeter-scale Mn-doped CsPbBr 3/Cs 4PbBr 6 crystals with enhanced photoluminescence and stability for light-emitting applications. Phys Chem Chem Phys 2023; 26:373-380. [PMID: 38073608 DOI: 10.1039/d3cp04371a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2023]
Abstract
Metal halide perovskites are particularly emerging for optoelectronic applications in light-emitting diodes, photodetectors, and solar cells due to their flourishing photophysical properties. However, the poor stability of three-dimensional (3D) lead halide perovskite nanocrystals (NCs) significantly hampers their optoelectronics and photovoltaics applications. Embedding 3D perovskites into zero-dimensional (0D) perovskite crystals and doping ions of appropriate elements into host lattices provide effective approaches to improve the stability and optical-electronic performance. In this study, millimeter-scale Mn-doped and undoped CsPbBr3/Cs4PbBr6 perovskite crystals were successfully fabricated by a one-step slow cooling method. We systematically investigated the effects of Mn2+ ion doping on the PL performance and stability of CsPbBr3/Cs4PbBr6 crystals. Compared with undoped crystals, the existence of Mn2+ ions not only blue-shifted the PL peak but also improved the luminescence performance and stability of the prepared millimeter-sized crystals. Moreover, doping Mn2+ ions can increase the proportion of radiative recombination at low temperature, which may be because Mn2+ ions can effectively accelerate the decay of a dark exciton by the magnetic mixing of bright and dark excitons. In addition, green LED devices with high efficiency packaged as-grown crystals are explored, which promises further application in display backlights.
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Affiliation(s)
- Wenfang Peng
- School of Science, Shanghai Institute of Technology, Shanghai, 201418, China.
| | - Rongrong Hu
- School of Science, Shanghai Institute of Technology, Shanghai, 201418, China.
| | - Bobo Yang
- School of Science, Shanghai Institute of Technology, Shanghai, 201418, China.
| | - Qiaoyun Wu
- School of Science, Shanghai Institute of Technology, Shanghai, 201418, China.
| | - Pan Liang
- College of Arts and Sciences, Shanghai Dianji University, Shanghai 201306, China
| | - Lin Cheng
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai, 200241, China
| | - Xixi Cheng
- School of Science, Shanghai Institute of Technology, Shanghai, 201418, China.
| | - Yuefeng Li
- School of Science, Shanghai Institute of Technology, Shanghai, 201418, China.
| | - Jun Zou
- School of Science, Shanghai Institute of Technology, Shanghai, 201418, China.
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2
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van Hattem A, Griveau JC, Colineau E, Lefering AJE, Konings RJM, Smith AL. Low-Temperature Heat Capacity of CsPbI 3, Cs 4PbI 6, and Cs 3Bi 2I 9. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2023; 127:22808-22816. [PMID: 38037636 PMCID: PMC10684112 DOI: 10.1021/acs.jpcc.3c05846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Revised: 10/25/2023] [Accepted: 10/30/2023] [Indexed: 12/02/2023]
Abstract
The heat capacities of CsPbI3, Cs4PbI6, and Cs3Bi2I9 were studied using low-temperature thermal relaxation calorimetry in the temperature range of 1.9-300 K. The three compounds are insulators, with no electronic contribution to the heat capacity. None of them show detectable anomalies in the studied temperature window. Thermodynamic properties at standard conditions are derived. Previously reported results on Cs3Bi2I9 are not fully consistent with the present findings. Moreover, the magnetic susceptibilities of the three title compounds were measured.
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Affiliation(s)
- Andries van Hattem
- Radiation
Science & Technology Department, Faculty of Applied Sciences, Delft University
of Technology, Mekelweg 15, Delft 2629JB, The Netherlands
| | | | - Eric Colineau
- European
Commission, Joint Research Centre, 76125 Karlsruhe, Germany
| | - Anton J. E. Lefering
- Radiation
Science & Technology Department, Faculty of Applied Sciences, Delft University
of Technology, Mekelweg 15, Delft 2629JB, The Netherlands
| | - Rudy J. M. Konings
- Radiation
Science & Technology Department, Faculty of Applied Sciences, Delft University
of Technology, Mekelweg 15, Delft 2629JB, The Netherlands
| | - Anna L. Smith
- Radiation
Science & Technology Department, Faculty of Applied Sciences, Delft University
of Technology, Mekelweg 15, Delft 2629JB, The Netherlands
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3
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Weinberg D, Park Y, Limmer DT, Rabani E. Size-Dependent Lattice Symmetry Breaking Determines the Exciton Fine Structure of Perovskite Nanocrystals. NANO LETTERS 2023. [PMID: 37229762 DOI: 10.1021/acs.nanolett.3c00861] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The order of bright and dark excitonic states in lead-halide perovskite nanocrystals is debated. It has been proposed that the Rashba effect, driven by lattice-induced symmetry breaking, causes a bright excitonic ground state. Direct measurements of excitonic spectra, however, show the signatures of a dark ground state, bringing the role of the Rashba effect into question. We use an atomistic theory to model the exciton fine structure of perovskite nanocrystals, accounting for realistic lattice distortions. We calculate optical gaps and excitonic features that compare favorably with experimental works. The exciton fine structure splittings show a nonmonotonic size dependence due to a structural transition between cubic and orthorhombic phases. Additionally, the excitonic ground state is found to be dark with spin triplet character, exhibiting a small Rashba coupling. We additionally explore the effects of nanocrystal shape on the fine structure, clarifying observations on polydisperse nanocrystals.
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Affiliation(s)
- Daniel Weinberg
- Department of Chemistry, University of California, Berkeley, California 94720, United States
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Yoonjae Park
- Department of Chemistry, University of California, Berkeley, California 94720, United States
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - David T Limmer
- Department of Chemistry, University of California, Berkeley, California 94720, United States
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
- Kavli Energy NanoScience Institute, Berkeley, California 94720, United States
| | - Eran Rabani
- Department of Chemistry, University of California, Berkeley, California 94720, United States
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
- The Raymond and Beverly Sackler Center of Computational Molecular and Materials Science, Tel Aviv University, Tel Aviv 69978, Israel
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4
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Laitz M, Kaplan AEK, Deschamps J, Barotov U, Proppe AH, García-Benito I, Osherov A, Grancini G, deQuilettes DW, Nelson KA, Bawendi MG, Bulović V. Uncovering temperature-dependent exciton-polariton relaxation mechanisms in hybrid organic-inorganic perovskites. Nat Commun 2023; 14:2426. [PMID: 37105984 PMCID: PMC10140020 DOI: 10.1038/s41467-023-37772-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Accepted: 03/30/2023] [Indexed: 04/29/2023] Open
Abstract
Hybrid perovskites have emerged as a promising material candidate for exciton-polariton (polariton) optoelectronics. Thermodynamically, low-threshold Bose-Einstein condensation requires efficient scattering to the polariton energy dispersion minimum, and many applications demand precise control of polariton interactions. Thus far, the primary mechanisms by which polaritons relax in perovskites remains unclear. In this work, we perform temperature-dependent measurements of polaritons in low-dimensional perovskite wedged microcavities achieving a Rabi splitting of [Formula: see text] = 260 ± 5 meV. We change the Hopfield coefficients by moving the optical excitation along the cavity wedge and thus tune the strength of the primary polariton relaxation mechanisms in this material. We observe the polariton bottleneck regime and show that it can be overcome by harnessing the interplay between the different excitonic species whose corresponding dynamics are modified by strong coupling. This work provides an understanding of polariton relaxation in perovskites benefiting from efficient, material-specific relaxation pathways and intracavity pumping schemes from thermally brightened excitonic species.
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Affiliation(s)
- Madeleine Laitz
- Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Alexander E K Kaplan
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Jude Deschamps
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Ulugbek Barotov
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Andrew H Proppe
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Inés García-Benito
- Department of Organic Chemistry, Universidad Complutense de Madrid, Madrid, Spain
| | - Anna Osherov
- Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Giulia Grancini
- Department of Chemistry & INSTM, University of Pavia, Pavia, Italy
| | - Dane W deQuilettes
- Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA, USA.
| | - Keith A Nelson
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Moungi G Bawendi
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Vladimir Bulović
- Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA, USA.
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5
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Kumar V, Chauhan HC, Nagal V, Hafiz AK, Singh K. Lattice-Distortion-Induced Change in the Magnetic Properties in Br-Defect Host CsPbBr 3 Perovskite Quantum Dots. J Phys Chem Lett 2023; 14:888-896. [PMID: 36662270 DOI: 10.1021/acs.jpclett.2c03576] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Herein, we report temperature- and field-induced magnetic states in CsPbBr3 perovskite quantum dots (PQDs) attributed to Br defects. We find that temperature-dependent structural distortion is the main source of various temperature-induced magnetic states in Br-defect host CsPbBr3 PQDs. Comprehensively examined magnetization data through Arrott plots, Langevin and Brillouin function fitting, and structural analysis reveal the presence of various oxidation states (i.e., Pb0, Pb+, Pb2+, and Pb3+) yielding different magnetic states, such as diamagnetic states above 90 K, paramagnetic states below ≈90 K, and perhaps locally ordered states between 58 and 90 K. It is realized from theoretical fits that paramagnetic ions exist (i.e., superparamagnetic behavior) due to Br defects causing Pb+ (and/or Pb3+ ions) in the diamagnetic region. We anticipate that our findings will spur future research of the development of spin-optoelectronics, such as spin light-emitting diodes, and spintronics devices based on CsPbBr3 PQDs.
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Affiliation(s)
- Virendra Kumar
- School of Physical Sciences, Jawaharlal Nehru University (JNU), New Delhi110067, India
| | - Harish Chandr Chauhan
- School of Physical Sciences, Jawaharlal Nehru University (JNU), New Delhi110067, India
| | - Vandana Nagal
- Quantum and Nano-photonics Research Laboratory, Centre for Nanoscience and Nanotechnology, Jamia Millia Islamia (A Central University), New Delhi110025, India
| | - Aurangzeb Khurram Hafiz
- Quantum and Nano-photonics Research Laboratory, Centre for Nanoscience and Nanotechnology, Jamia Millia Islamia (A Central University), New Delhi110025, India
| | - Kedar Singh
- School of Physical Sciences, Jawaharlal Nehru University (JNU), New Delhi110067, India
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6
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Wang S, Dyksik M, Lampe C, Gramlich M, Maude DK, Baranowski M, Urban AS, Plochocka P, Surrente A. Thickness-Dependent Dark-Bright Exciton Splitting and Phonon Bottleneck in CsPbBr 3-Based Nanoplatelets Revealed via Magneto-Optical Spectroscopy. NANO LETTERS 2022; 22:7011-7019. [PMID: 36036573 PMCID: PMC9479212 DOI: 10.1021/acs.nanolett.2c01826] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2022] [Revised: 08/20/2022] [Indexed: 05/06/2023]
Abstract
The optimized exploitation of perovskite nanocrystals and nanoplatelets as highly efficient light sources requires a detailed understanding of the energy spacing within the exciton manifold. Dark exciton states are particularly relevant because they represent a channel that reduces radiative efficiency. Here, we apply large in-plane magnetic fields to brighten optically inactive states of CsPbBr3-based nanoplatelets for the first time. This approach allows us to access the dark states and directly determine the dark-bright splitting, which reaches 22 meV for the thinnest nanoplatelets. The splitting is significantly less for thicker nanoplatelets due to reduced exciton confinement. Additionally, the form of the magneto-PL spectrum suggests that dark and bright state populations are nonthermalized, which is indicative of a phonon bottleneck in the exciton relaxation process.
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Affiliation(s)
- Shuli Wang
- Laboratoire
National des Champs Magnétiques Intenses, EMFL, CNRS UPR 3228,
Université Grenoble Alpes, Université
Toulouse, Université Toulouse 3, INSA-T, 38042 Grenoble
and 31400 Toulouse, France
| | - Mateusz Dyksik
- Department
of Experimental Physics, Faculty of Fundamental Problems of Technology, Wroclaw University of Science and Technology, 50-370 Wroclaw, Poland
| | - Carola Lampe
- Nanospectroscopy
Group and Center for Nanoscience (CeNS), Nano-Institute Munich, Department
of Physics, Ludwig-Maximilians-Universität
München (LMU), Munich 80539 Germany
| | - Moritz Gramlich
- Nanospectroscopy
Group and Center for Nanoscience (CeNS), Nano-Institute Munich, Department
of Physics, Ludwig-Maximilians-Universität
München (LMU), Munich 80539 Germany
| | - Duncan K. Maude
- Laboratoire
National des Champs Magnétiques Intenses, EMFL, CNRS UPR 3228,
Université Grenoble Alpes, Université
Toulouse, Université Toulouse 3, INSA-T, 38042 Grenoble
and 31400 Toulouse, France
| | - Michał Baranowski
- Department
of Experimental Physics, Faculty of Fundamental Problems of Technology, Wroclaw University of Science and Technology, 50-370 Wroclaw, Poland
| | - Alexander S. Urban
- Nanospectroscopy
Group and Center for Nanoscience (CeNS), Nano-Institute Munich, Department
of Physics, Ludwig-Maximilians-Universität
München (LMU), Munich 80539 Germany
| | - Paulina Plochocka
- Laboratoire
National des Champs Magnétiques Intenses, EMFL, CNRS UPR 3228,
Université Grenoble Alpes, Université
Toulouse, Université Toulouse 3, INSA-T, 38042 Grenoble
and 31400 Toulouse, France
- Department
of Experimental Physics, Faculty of Fundamental Problems of Technology, Wroclaw University of Science and Technology, 50-370 Wroclaw, Poland
| | - Alessandro Surrente
- Department
of Experimental Physics, Faculty of Fundamental Problems of Technology, Wroclaw University of Science and Technology, 50-370 Wroclaw, Poland
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7
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Wu L, Wang Y, Kurashvili M, Dey A, Cao M, Döblinger M, Zhang Q, Feldmann J, Huang H, Debnath T. Interfacial Manganese-Doping in CsPbBr 3 Nanoplatelets by Employing a Molecular Shuttle. Angew Chem Int Ed Engl 2022; 61:e202115852. [PMID: 34995399 PMCID: PMC9305410 DOI: 10.1002/anie.202115852] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2021] [Indexed: 11/29/2022]
Abstract
Mn-doping in cesium lead halide perovskite nanoplatelets (NPls) is of particular importance where strong quantum confinement plays a significant role towards the exciton-dopant coupling. In this work, we report an immiscible bi-phasic strategy for post-synthetic Mn-doping of CsPbX3 (X=Br, Cl) NPls. A systematic study shows that electron-donating oleylamine acts as a shuttle ligand to transport MnX2 through the water-hexane interface and deliver it to the NPls. The halide anion also plays an essential role in maintaining an appropriate radius of Mn2+ and thus fulfilling the octahedral factor required for the formation of perovskite crystals. By varying the thickness of parent NPls, we can tune the dopant incorporation and, consequently, the exciton-to-dopant energy transfer process in doped NPls. Time-resolved optical measurements offer a detailed insight into the exciton-to-dopant energy transfer process. This new approach for post-synthetic cation doping paves a way towards exploring the cation exchange process in several other halide perovskites at the polar-nonpolar interface.
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Affiliation(s)
- Linzhong Wu
- Chair for Photonics and OptoelectronicsNano-Institute MunichDepartment of PhysicsLudwig-Maximilians-Universität MünchenKöniginstr. 1080539MünchenGermany
- Institute of Functional Nano and Soft Materials (FUNSOM)Jiangsu Key Laboratory for Carbon-Based Functional Materials and DevicesSoochow University199 Ren'ai RoadSuzhou215123JiangsuP. R. China
| | - Yiou Wang
- Chair for Photonics and OptoelectronicsNano-Institute MunichDepartment of PhysicsLudwig-Maximilians-Universität MünchenKöniginstr. 1080539MünchenGermany
| | - Mariam Kurashvili
- Chair for Photonics and OptoelectronicsNano-Institute MunichDepartment of PhysicsLudwig-Maximilians-Universität MünchenKöniginstr. 1080539MünchenGermany
| | - Amrita Dey
- Chair for Photonics and OptoelectronicsNano-Institute MunichDepartment of PhysicsLudwig-Maximilians-Universität MünchenKöniginstr. 1080539MünchenGermany
| | - Muhan Cao
- Institute of Functional Nano and Soft Materials (FUNSOM)Jiangsu Key Laboratory for Carbon-Based Functional Materials and DevicesSoochow University199 Ren'ai RoadSuzhou215123JiangsuP. R. China
| | - Markus Döblinger
- Department of ChemistryLudwig-Maximilians-Universität MünchenButenandtstrasse 5–13 (E)81377MünchenGermany
| | - Qiao Zhang
- Institute of Functional Nano and Soft Materials (FUNSOM)Jiangsu Key Laboratory for Carbon-Based Functional Materials and DevicesSoochow University199 Ren'ai RoadSuzhou215123JiangsuP. R. China
| | - Jochen Feldmann
- Chair for Photonics and OptoelectronicsNano-Institute MunichDepartment of PhysicsLudwig-Maximilians-Universität MünchenKöniginstr. 1080539MünchenGermany
| | - He Huang
- Chair for Photonics and OptoelectronicsNano-Institute MunichDepartment of PhysicsLudwig-Maximilians-Universität MünchenKöniginstr. 1080539MünchenGermany
- School of Optoelectronic Science and Engineering &Collaborative Innovation Center of Suzhou Nano Science and TechnologySoochow UniversitySuzhou215006P. R. China
| | - Tushar Debnath
- Chair for Photonics and OptoelectronicsNano-Institute MunichDepartment of PhysicsLudwig-Maximilians-Universität MünchenKöniginstr. 1080539MünchenGermany
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8
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Debnath T, Wu L, Wang Y, Kurashvili M, Dey A, Cao M, Döblinger M, Zhang Q, Feldmann J, Huang H. Interfacial Manganese‐doping in CsPbBr3 Nanoplatelets by Employing a Molecular Shuttle. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202115852] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Tushar Debnath
- Ludwig-Maximilians-Universitat Munchen Physics Chair for Photonics and OptoelectronicsNano-Institute MünchenLudwig-Maximilians-Universität MünchenKöniginstr. 10 80539 Munich GERMANY
| | - Linzhong Wu
- Ludwig-Maximilians-Universität München: Ludwig-Maximilians-Universitat Munchen Department of Physics Königinstr. 10Nano-Institute München 80539 Munich GERMANY
| | - Yiou Wang
- Ludwig-Maximilians-Universitat Munchen Department of Physics Königinstr. 10Nano-Institute München 80539 Munich GERMANY
| | - Mariam Kurashvili
- Ludwig-Maximilians-Universität München: Ludwig-Maximilians-Universitat Munchen Department of Physics Königinstr. 10Nano-Institute München 8-539 Munich GERMANY
| | - Amrita Dey
- Ludwig-Maximilians-Universität München: Ludwig-Maximilians-Universitat Munchen Department of Physics Königinstr. 10Nano-Institute München 80539 Munich GERMANY
| | - Muhan Cao
- Soochow University Institute of Functional Nano & Soft Materials (FUNSOM) 199 Ren’ai Road 215123 Suzhou CHINA
| | - Markus Döblinger
- Ludwig-Maximilians-Universität München: Ludwig-Maximilians-Universitat Munchen Department of Chemistry Butenandtstrasse 5–13 (E) 81377 Munich GERMANY
| | - Qiao Zhang
- Soochow University Institute of Functional Nano & Soft Materials (FUNSOM) 199 Ren’ai Road 215123 Suzhou CHINA
| | - Jochen Feldmann
- Ludwig-Maximilians-Universität München: Ludwig-Maximilians-Universitat Munchen Department of Physics Königinstr. 10Nano-Institute Munich 80539 Munich GERMANY
| | - He Huang
- Ludwig-Maximilians-Universität München: Ludwig-Maximilians-Universitat Munchen Department of Physics Königinstr. 10Nano-Institute Munich 80539 Munich GERMANY
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