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Debnath T. Ultrafast electron shuttling suppresses the energy transfer process in Mn-doped CsPbCl 3 nanocrystals. Phys Chem Chem Phys 2024; 26:19625-19629. [PMID: 39011547 DOI: 10.1039/d4cp01815j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/17/2024]
Abstract
Taking advantage of the slow exciton-to-dopant energy transfer process, we dissociated the exciton in Mn-doped perovskite via ultrafast electron shuttling to a surface adsorbed 4-nitro phenol molecule. The observed ultrafast electron transfer process is competitive to the ultrafast exciton scattering process (∼140 fs) to the continuum states via optical phonons, but three-orders faster than the exciton-to-Mn energy transfer timescale.
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Affiliation(s)
- Tushar Debnath
- Nano Physical Spectroscopy Group, Department of Chemistry, School of Natural Sciences, Shiv Nadar Institution of Eminence, Delhi NCR, Uttar Pradesh-201314, India.
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2
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Agarwal N, Agarwal D, Debnath T. Amino Acid-Driven Dimensional Reduction of CsPbBr 3 Nanocrystals. ACS OMEGA 2024; 9:31026-31034. [PMID: 39035888 PMCID: PMC11256307 DOI: 10.1021/acsomega.4c04364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/08/2024] [Revised: 06/05/2024] [Accepted: 06/17/2024] [Indexed: 07/23/2024]
Abstract
Inspired by biomineralization, the recent incorporation of organic molecules into inorganic lattices shows interesting optical properties and tunability. We functionalize all inorganic CsPbBr3 perovskite nanocrystals (PNCs) with amino acid (AA) cysteine using the water-hexane interfacial approach. Along with the AA cysteine, we added AuBr3 salt into the aqueous phase, leading to the formation of a Au-cysteine thiolate complex to activate the aqueous to nonaqueous phase transportation of the AA via a molecular shuttle, oleylamine. The interaction between CsPbBr3 PNCs and the Au-cysteine thiolate complex is probed using optical spectroscopy, which reveals dimensional reduction of the parent PNCs to form CsPbBr3 nanoplatelets (NPls) and subsequent phase transformation to CsPb2Br5 NPls. X-ray diffraction, X-ray photoelectron spectroscopy, and high-resolution transmission electron microscopy conclusively support the above chemical transformation reaction via interfacial chemistry. We propose a mechanistic insight into the dimensional growth in one direction in the presence of AAs via preferential ligand binding to specific facets, leading to transformation from 3D cubes to 2D NPls, while, presumably, the phase transformation occurs via the CsBr stripping mechanism upon prolonged interaction with water. Since AAs are building blocks for several redox-active complex biological moieties, including proteins, investigation of the interaction of AAs with PNCs may be advantageous since the latter can act as a fluorescent probe for bioimaging application.
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Affiliation(s)
- Nikunj Agarwal
- Centre
for Nanotechnology, Indian Institute of
Technology Guwahati, Guwahati 781039, Assam, India
| | - Deepshikha Agarwal
- Centre
for Nanotechnology, Indian Institute of
Technology Guwahati, Guwahati 781039, Assam, India
| | - Tushar Debnath
- Centre
for Nanotechnology, Indian Institute of
Technology Guwahati, Guwahati 781039, Assam, India
- Nano
Physical Spectroscopy Group, Department of Chemistry, School of Natural
Sciences, Shiv Nadar Institution of Eminence, Delhi NCR 201314, Uttar Pradesh, India
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3
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Samanta S, Paul S, Debnath T. Obtaining Ligand-Free Aqueous Au-Nanoparticles Using Reversible CsPbBr 3 ↔ Au@CsPbBr 3 Nanocrystal Transformation. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2311712. [PMID: 38258404 DOI: 10.1002/smll.202311712] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2023] [Indexed: 01/24/2024]
Abstract
Water-hexane interfacial preparation of photostable Au@CsPbBr3 (Au@CPB) hybrid nanocrystals (NCs) from pure CsPbBr3 (CPB) NCs is reported, with the coexistence of exciton and localized surface plasmon resonance with equal dominance. This enables strong exciton-plasmon coupling in these plasmonic perovskite NCs where not only the photoluminescence is quenched intrinsically due to ultrafast charge separation, but also the light absorption property increases significantly, covering the entire visible region. Using a controlled interfacial strategy, a reversible chemical transformation between CPB and Au@CPB NCs is shown, with the simultaneous eruption of larger-size ligand-free aqueous Au nanoparticles (NPs). An adsorption-desorption mechanism is proposed for the reversible transformation, while the overgrowth reaction of the Au NPs passes through the Au aggregation intermediate. This study further shows that the plasmonic Au@CPB hybrid NCs as well as ligand-free Au NPs exhibit clear surface enhanced Raman scattering (SERS) effect of a commercially available probe molecule. Overall, the beautiful interfacial chemistry delivers two independent plasmonic materials, i.e., Au@CPB NCs and ligand-free aqueous Au NPs, which may find important implications in photocatalytic and biomedical applications.
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Affiliation(s)
- Subarna Samanta
- Centre for Nanotechnology, Indian Institute of Technology Guwahati, Guwahati, Assam, 781039, India
| | - Sujay Paul
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam, 781039, India
| | - Tushar Debnath
- Centre for Nanotechnology, Indian Institute of Technology Guwahati, Guwahati, Assam, 781039, India
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4
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von Schwerin P, Döblinger M, Debnath T, Feldmann J, Akkerman QA. Size-Tunable Manganese-Doped Spheroidal CsPbCl 3 Quantum Dots. J Phys Chem Lett 2024; 15:3728-3732. [PMID: 38546986 DOI: 10.1021/acs.jpclett.4c00049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/12/2024]
Abstract
Manganese doping has been demonstrated as a versatile tool to tune the emission of CsPbCl3 nanocrystals (NCs). Although this has been demonstrated in nanocubes and nanoplatelets, strategies for doping Mn2+ in size-tunable, excitonic CsPbCl3 quantum dots (QDs) remain absent. In this work, we demonstrate the synthesis of size-tunable spheroidal CsPbCl3:Mn2+ QDs, which can be obtained by a water-hexane interfacial combined anion and cation exchange strategy starting from CsPbBr3 QDs. Interestingly, the QDs exhibit a fast 0.2 ms Mn2+ photoluminescence (PL) lifetime and an energy transfer (ET) time of approximately 100 ps from the excitonic state of the QD to the atomic state of the Mn2+ ion. The size dependence observation of the manganese PL efficiency and the slow ET rate suggest that Mn2+ mainly gets incorporated at the QD's surface, highlighting the importance of strategies chosen for the incorporation of Mn2+ into perovskite QDs.
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Affiliation(s)
- Patrick von Schwerin
- Chair for Photonics and Optoelectronics, Nano-Institute Munich and Department of Physics, Ludwig-Maximilians-Universität (LMU), Königinstr. 10, 80539 Munich, Germany
| | - Markus Döblinger
- Department of Chemistry, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13 (E), 81377 Munich, Germany
| | - Tushar Debnath
- Chair for Photonics and Optoelectronics, Nano-Institute Munich and Department of Physics, Ludwig-Maximilians-Universität (LMU), Königinstr. 10, 80539 Munich, Germany
- Nano Physical Spectroscopy Group, Department of Chemistry, School of Natural Sciences, Shiv Nadar Institution of Eminence, Delhi NCR, Uttar Pradesh 201314, India
| | - Jochen Feldmann
- Chair for Photonics and Optoelectronics, Nano-Institute Munich and Department of Physics, Ludwig-Maximilians-Universität (LMU), Königinstr. 10, 80539 Munich, Germany
| | - Quinten A Akkerman
- Chair for Photonics and Optoelectronics, Nano-Institute Munich and Department of Physics, Ludwig-Maximilians-Universität (LMU), Königinstr. 10, 80539 Munich, Germany
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5
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Sahu S, Debnath T, Sahu K. Reversible CsPbBr 3 ↔ CsPb 2Br 5 Transformation via Reverse Micellar Aqueous Solution. J Phys Chem Lett 2024; 15:3677-3682. [PMID: 38535976 DOI: 10.1021/acs.jpclett.4c00451] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/05/2024]
Abstract
Lead halide perovskites suffer from water and moisture instability due to the highly ionic nature of the crystal structures, though a few groups took advantage of it for chemical transformation via water-assisted strategy. However, direct exposure of the perovskite to bulk water leads to uncontrolled chemical transformation. Here, we report a controlled chemical transformation of CsPbBr3 to CsPb2Br5 triggered by nanoconfined water by placing CsPbBr3 in the nonpolar phase within a reverse micelle. The chemical transformation reaction is probed by using steady-state and time-resolved optical spectroscopy. We observe absorption and photoluminescence in the UV region stemming clearly from the CsPb2Br5 phase upon interaction with the reverse micellar aqueous solution. Transmission electron microscopy and X-ray diffraction measurements further provided the structure and morphology. Our results direct the formation of CsPbBr3-CsPb2Br5 nanocomposite under dry conditions while the chemically transformed CsPb2Br5 phase exists only in moist conditions, which we explain via the CsBr-stripping mechanism.
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Affiliation(s)
- Subhashree Sahu
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India
| | - Tushar Debnath
- Nano Physical Spectroscopy Group, Department of Chemistry, School of Natural Sciences, Shiv Nadar Institution of Eminence, Delhi NCR, Uttar Pradesh 201314, India
| | - Kalyanasis Sahu
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India
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6
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Manna M, Pal S, Goswami T, Bhandari S, Debnath T. Halide-Driven Halogen-Hydrogen Bonding versus Chelation in Perovskite Nanocrystals: A Concept of Charge Transfer Bridging. J Phys Chem Lett 2023; 14:354-362. [PMID: 36606726 DOI: 10.1021/acs.jpclett.2c03738] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
The choice of surface functionalized ligands to encapsulate semiconductor nanocrystals (NCs) is important for tailoring their optoelectronic properties. We use a small bidentate 8-hydroxyquinoline (HQ) molecule to surface functionalize CsPbX3 perovskite NCs (X = Cl, Br, I), along with traditional long-chain monodentate ligands. Our experimental results using optical and ultrafast spectroscopy depict a halogen-hydrogen bonding formation in the HQ functionalized CsPbCl3 and CsPbBr3 NCs, which act as a charge transfer (CT) bridging for the interfacial hole transfer from the NCs to the HQ molecule as fast as 540 fs. In contrast, weak chelation is observed for HQ-coupled CsPbI3 NCs without an active CT process. We explain two distinct surface coupling mechanisms via the polarizability of halides and larger PbI64- octahedral cage size. Control of two contrasting halide-dependent surface coupling phenomena of a small molecule that further regulate the CT process may have significant implications in their development in optoelectronics.
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Affiliation(s)
- Mihir Manna
- Centre for Nanotechnology, Indian Institute of Technology Guwahati, Guwahati, Assam781039, India
| | - Srimanta Pal
- Centre for Nanotechnology, Indian Institute of Technology Guwahati, Guwahati, Assam781039, India
| | - Tanmay Goswami
- Institute of Nano Science and Technology, Knowledge City, Sector 81, Mohali140306, Punjab, India
| | - Satyapriya Bhandari
- Department of Chemistry, University of North Bengal, Darjeeling, West Bengal734013, India
| | - Tushar Debnath
- Centre for Nanotechnology, Indian Institute of Technology Guwahati, Guwahati, Assam781039, India
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7
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Skurlov ID, Sokolova AV, Tatarinov DA, Parfenov PS, Kurshanov DA, Ismagilov AO, Koroleva AV, Danilov DV, Zhizhin EV, Mikushev SV, Tcypkin AN, Fedorov AV, Litvin AP. Engineering the Optical Properties of CsPbBr 3 Nanoplatelets through Cd 2+ Doping. MATERIALS (BASEL, SWITZERLAND) 2022; 15:7676. [PMID: 36363269 PMCID: PMC9657966 DOI: 10.3390/ma15217676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/14/2022] [Revised: 10/29/2022] [Accepted: 10/30/2022] [Indexed: 06/16/2023]
Abstract
Lead halide perovskite nanoplatelets (NPls) attract significant attention due to their exceptional and tunable optical properties. Doping is a versatile strategy for modifying and improving the optical properties of colloidal nanostructures. However, the protocols for B-site doping have been rarely reported for 2D perovskite NPls. In this work, we investigated the post-synthetic treatment of CsPbBr3 NPls with different Cd2+ sources. We show that the interplay between Cd2+ precursor, NPl concentrations, and ligands determines the kinetics of the doping process. Optimization of the treatment allows for the boosting of linear and nonlinear optical properties of CsPbBr3 NPls via doping or/and surface passivation. At a moderate doping level, both the photoluminescence quantum yield and two-photon absorption cross section increase dramatically. The developed protocols of post-synthetic treatment with Cd2+ facilitate further utilization of perovskite NPls in nonlinear optics, photonics, and lightning.
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Affiliation(s)
- Ivan D. Skurlov
- PhysNano Department, ITMO University, 197101 Saint Petersburg, Russia
| | | | | | - Peter S. Parfenov
- PhysNano Department, ITMO University, 197101 Saint Petersburg, Russia
| | | | - Azat O. Ismagilov
- Laboratory of Quantum Processes and Measurements, ITMO University, 197101 Saint Petersburg, Russia
| | | | - Denis V. Danilov
- Research Park, Saint Petersburg State University, 199034 Saint Petersburg, Russia
| | - Evgeniy V. Zhizhin
- Research Park, Saint Petersburg State University, 199034 Saint Petersburg, Russia
| | - Sergey V. Mikushev
- Research Park, Saint Petersburg State University, 199034 Saint Petersburg, Russia
| | - Anton N. Tcypkin
- Laboratory of Quantum Processes and Measurements, ITMO University, 197101 Saint Petersburg, Russia
| | | | - Aleksandr P. Litvin
- PhysNano Department, ITMO University, 197101 Saint Petersburg, Russia
- Laboratory of Quantum Processes and Measurements, ITMO University, 197101 Saint Petersburg, Russia
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8
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Li J, Guo Z, Xiao S, Tu Y, He T, Zhang W. Enhanced Performance of Two-Photon Excited Amplified Spontaneous Emission by Cd-Alloyed CsPbBr 3 Nanocrystals. Inorg Chem 2022; 61:4735-4742. [PMID: 35266707 DOI: 10.1021/acs.inorgchem.2c00077] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
It has been demonstrated that the alloyed perovskite nanocrystals (NCs) with a small amount of Cd element may passivate the inherent halide vacancies in perovskite NCs and improve their stability. However, the study of the optical properties of such alloyed perovskite NCs still remains essentially untouched, which will seriously hinder relevant applications. Herein, using different amounts of CdBr2 as an alloyed metal precursor, a series of CsPbxCd1-xBr3 NCs (x = 1, 0.93, and 0.88) were synthesized. Compared with bare CsPbBr3 NCs, the Cd-alloyed NCs exhibited a near-unity photoluminescence quantum yield (99%), efficiently improved stability, and enhanced electron-phonon coupling strength. As the Cd-alloyed amount was increased, their hot-carrier cooling time became faster and the exciton-biexciton interaction decreased, causing a decreased threshold of two-photon excited amplified spontaneous emission (ASE) from 1.58 to 1.23 mJ cm-2. In addition, the Cd-alloying method can also improve the photostability of ASE, resulting in the initial ASE intensity remaining at 90% even after 7.5 × 105 pulse shots. This work implies that the Cd-alloyed CsPbBr3 NCs will be promising for application in a laser gain medium.
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Affiliation(s)
- Junzi Li
- International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education, Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen 518060, China
| | - Zhihang Guo
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
| | - Shuyu Xiao
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
| | - Yudi Tu
- International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education, Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen 518060, China
| | - Tingchao He
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
| | - Wenjing Zhang
- International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education, Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen 518060, China
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