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Jiang X, Tao Y, Gu J, Jin L, Li C, Zhang W, Fu Y. Broadband emission originating from the stereochemical expression of 6s 2 lone pairs in two-dimensional lead bromide perovskites. Dalton Trans 2023; 52:15489-15495. [PMID: 37552134 DOI: 10.1039/d3dt01627g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/09/2023]
Abstract
The stereochemical expression of the 6s2 lone pair on the lead atom has a significant impact on the crystal structures and physical properties of lead halide perovskites. Two-dimensional (2D) lead bromide perovskites often exhibit a broadband emission, yet the structural origin of the broadband emission has been under debate. Here, we report the synthesis and characterization of a 2D lead bromide hybrid (4-chlorophenylammonium)2PbBr4 that consists of a combination of the octahedral unit PbBr6 and the rarely observed capped octahedral unit PbBr7 through corner-sharing and edge-sharing linkages. The seven-coordination geometry indicates a strong stereo-active lone pair on the Pb2+ cation. By comparing this structure with two representative 2D perovskites, (benzylammonium)2PbBr4 and (4-aminotetrahydropyran)2PbBr4, we establish how the lone pair expression affects the local coordination geometry of the Pb2+ cation and the resulting optical and electronic properties. As the Pb-Br bond length increases, the lone pair expression leads to off-centering displacement of Pb2+ within the octahedra and then the formation of seven-coordination capped octahedra. Density functional theory calculations indicate that the off-centering distorted octahedra and capped octahedra are due to the asymmetric distribution of the Pb electrons that have both s and p orbital characteristics. Spectroscopic studies show the photoluminescence spectra evolving from narrowband emission to broadband emission with increasing LPE, as well as softer and more anharmonic lattice vibrations that facilitate exciton self-trapping. Our results demonstrate that lone pairs could be a powerful design rule for developing light emitting materials.
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Affiliation(s)
- Xiaofan Jiang
- Beijing National Laboratory for Molecular Science, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
- Department of Physics and Applied Optics Beijing Area Major Laboratory, Center for Advanced Quantum Studies, Beijing Normal University, Beijing 100875, China.
| | - Yu Tao
- Beijing National Laboratory for Molecular Science, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
| | - Jiazhen Gu
- Beijing National Laboratory for Molecular Science, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
| | - Leyang Jin
- Beijing National Laboratory for Molecular Science, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
| | - Chen Li
- Beijing National Laboratory for Molecular Science, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
| | - Wenkai Zhang
- Department of Physics and Applied Optics Beijing Area Major Laboratory, Center for Advanced Quantum Studies, Beijing Normal University, Beijing 100875, China.
| | - Yongping Fu
- Beijing National Laboratory for Molecular Science, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
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Chen R, Sun C, Cheng X, Lin Y, Zhou J, Yin J, Cui BB, Mao L. One-Dimensional Organic-Inorganic Lead Bromide Hybrids with Excitation-Dependent White-Light Emission Templated by Pyridinium Derivatives. Inorg Chem 2023. [PMID: 37285221 DOI: 10.1021/acs.inorgchem.3c00997] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Organic-inorganic hybrid metal halides have attracted widespread attention due to their excellent tunability and versatility. Here, we have selected pyridinium derivatives with different substituent groups or substitution positions as the organic templating cations and obtained six 1D chain-like structures. They are divided into three types: type I (single chain), type II (double chain), and type III (triple chain), with tunable optical band gaps and emission properties. Among them, only (2,4-LD)PbBr3 (2,4-LD = 2,4-lutidine) shows an exciton-dependent emission phenomenon, ranging from strong yellow-white to weak red-white light. By comparing its photoluminescence spectrum with that of its bromate (2,4-LD)Br, it is found that the strong yellow-white emission at 534 nm mainly came from the organic component. Furthermore, through a comparison of the fluorescence spectra and lifetimes of (2,4-LD)PbBr3 and (2-MP)PbBr3 (2-MP = 2-methylpyridine) with similar structures at different temperatures, we confirm that the tunable emission of (2,4-LD)PbBr3 comes from different photoluminescent sources corresponding to organic cations and self-trapped excitons. Density functional theory calculations further reveal that (2,4-LD)PbBr3 has a stronger interaction between organic and inorganic components compared to (2-MP)PbBr3. This work highlights the importance of organic templating cations in hybrid metal halides and the new functionalities associated with them.
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Affiliation(s)
- Runan Chen
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
| | - Chen Sun
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
| | - Xiaohua Cheng
- Advanced Research Institute of Multidisciplinary Science, Schools of Chemistry and Chemical Engineering, School of Materials Science and Engineering, Beijing Institute of Technology (BIT), Beijing 100081, China
| | - Yufan Lin
- Advanced Research Institute of Multidisciplinary Science, Schools of Chemistry and Chemical Engineering, School of Materials Science and Engineering, Beijing Institute of Technology (BIT), Beijing 100081, China
| | - Jiaqian Zhou
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
| | - Jun Yin
- Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong 999077, China
| | - Bin-Bin Cui
- Advanced Research Institute of Multidisciplinary Science, Schools of Chemistry and Chemical Engineering, School of Materials Science and Engineering, Beijing Institute of Technology (BIT), Beijing 100081, China
| | - Lingling Mao
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
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Azmy A, Li S, Angeli GK, Welton C, Raval P, Li M, Zibouche N, Wojtas L, Reddy GNM, Guo P, Trikalitis PN, Spanopoulos I. Porous and Water Stable 2D Hybrid Metal Halide with Broad Light Emission and Selective H 2 O Vapor Sorption. Angew Chem Int Ed Engl 2023; 62:e202218429. [PMID: 36656785 DOI: 10.1002/anie.202218429] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Revised: 01/16/2023] [Accepted: 01/18/2023] [Indexed: 01/20/2023]
Abstract
In this work we report a strategy for generating porosity in hybrid metal halide materials using molecular cages that serve as both structure-directing agents and counter-cations. Reaction of the [2.2.2] cryptand (DHS) linker with PbII in acidic media gave rise to the first porous and water-stable 2D metal halide semiconductor (DHS)2 Pb5 Br14 . The corresponding material is stable in water for a year, while gas and vapor-sorption studies revealed that it can selectively and reversibly adsorb H2 O and D2 O at room temperature (RT). Solid-state NMR measurements and DFT calculations verified the incorporation of H2 O and D2 O in the organic linker cavities and shed light on their molecular configuration. In addition to porosity, the material exhibits broad light emission centered at 617 nm with a full width at half-maximum (FWHM) of 284 nm (0.96 eV). The recorded water stability is unparalleled for hybrid metal halide and perovskite materials, while the generation of porosity opens new pathways towards unexplored applications (e.g. solid-state batteries) for this class of hybrid semiconductors.
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Affiliation(s)
- Ali Azmy
- Department of Chemistry, University of South Florida, Tampa, FL 33620, USA
| | - Shunran Li
- Department of Chemical and Environmental Engineering, Yale University, 9 Hillhouse Avenue, New Haven, CT 06520, USA.,Energy Sciences Institute, Yale University, 810 West Campus Drive, West Haven, CT 06516, USA
| | - Giasemi K Angeli
- Department of Chemistry, University of Crete, 71003, Heraklion, Greece
| | - Claire Welton
- University of Lille, CNRS, Centrale Lille Institut, Univ. Artois, UMR8181-UCCS-Unité de Catalyse et Chimie du Solide, 59000, Lille, France
| | - Parth Raval
- University of Lille, CNRS, Centrale Lille Institut, Univ. Artois, UMR8181-UCCS-Unité de Catalyse et Chimie du Solide, 59000, Lille, France
| | - Min Li
- West Campus Materials Characterization Core, Yale University, New Haven, CT 06520, USA
| | | | - Lukasz Wojtas
- Department of Chemistry, University of South Florida, Tampa, FL 33620, USA
| | - G N Manjunatha Reddy
- University of Lille, CNRS, Centrale Lille Institut, Univ. Artois, UMR8181-UCCS-Unité de Catalyse et Chimie du Solide, 59000, Lille, France
| | - Peijun Guo
- Department of Chemical and Environmental Engineering, Yale University, 9 Hillhouse Avenue, New Haven, CT 06520, USA.,Energy Sciences Institute, Yale University, 810 West Campus Drive, West Haven, CT 06516, USA
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Zhao SP, Yu QH, Yang P, Guo Y, Wang J, Xu H. Diverse structures and multi-step dielectric relaxation of three lead bromide hybrid crystals based on 1-aminopyridinium and its cyano-substituted Schiff bases. Polyhedron 2022. [DOI: 10.1016/j.poly.2022.116121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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