Experimental evidence of the molecular and macroscopic origins of circular dichroism in chiral metal-halide networks DOI Creative Commons
Alexandre Abhervé

Research Square (Research Square), Journal Year: 2024, Volume and Issue: unknown

Published: March 15, 2024

Abstract Clockwise or counter-clockwise spin coating? In the current hot research topic of chiral metal-halide semiconductors, several investigations have been undertaken in order to reveal their natural optical activity and reported dissymmetry factors (gabs) for thin films many hybrid compounds, usually without considering macroscopic anisotropies inherent solid-state samples. Yet, CD solid state can be strongly modulated by co-existence linear dichroism (LD) birefringence (LB). Theoretical studies recently revealed importance such interferences response samples, often referred as symmetric (sLDLB) antisymmetric (aLDLB) effects. Based on newly synthesized one-dimensional lead-halide networks formula (S/R-HP1A)PbBr3 (S/R-HP1A)PbI3, an experimental method accurately discriminate between CD, sLDLB aLDLB is here presented. The main conditions influencing amplitude are also highlighted, concentration precursor solution spin-coating rotation direction, finally providing a complete guide forthcoming chiroptical important family materials.

Language: Английский

Mechanically Tunable Circularly Polarized Luminescence of Liquid Crystal‐Templated Chiral Perovskite Quantum Dots DOI
Xuan Zhang, Lin Li, Yuanhao Chen

et al.

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(22)

Published: March 25, 2024

Abstract Endowing perovskite quantum dots (PQDs) with circularly polarized luminescence (CPL) offers great promise for innovative chiroptical applications, but the existing strategies are inefficient in acquiring stimuli‐responsive flexible chiral films large, tunable dissymmetry factor ( g lum ) and long‐term stability. Here, we report a strategy design synthesis of luminescent cholesteric liquid crystal elastomer (Lumin‐CLCE) mechanically CPL, which is enabled by crystal‐templated self‐assembly situ covalent cross‐linking judiciously designed photopolymerizable CsPbX 3 (X=Cl, Br, I) PQD nanomonomers into elastic polymer networks. The resulting Lumin‐CLCE showcase structural color natural light noticeable CPL maximum value up to 1.5 under UV light. manipulation intensity rotation direction achieved controlling self‐assembled helicoidal nanostructure handedness soft helices. A significant breakthrough lies achievement reversible, perovskite‐based switch activated biaxial stretching, enables flexible, dynamic anti‐counterfeiting labels capable decrypting preset information specific polarization states. This work can provide new insights development advanced materials their emerging applications encryption, 3D displays, beyond.

Language: Английский

Citations

35
Beyond conventional: Role of chiral metal–organic frameworks in asymmetric scenarios DOI

Maryam Chafiq,

Abdelkarim Chaouiki, Jungho Ryu

et al.

Nano Today, Journal Year: 2024, Volume and Issue: 56, P. 102227 - 102227

Published: March 18, 2024

Language: Английский

Citations

19
Efficient Quasi-2D Perovskite Spin Light-Emitting Diodes Based on Chiral-Induced Spin Selectivity DOI

Ruxi Zhang,

Yunfei Tian,

Chuying Ye

et al.

Chemistry of Materials, Journal Year: 2024, Volume and Issue: 36(8), P. 3812 - 3819

Published: April 5, 2024

Perovskites with spin-polarized properties are promising for realizing spin light-emitting diodes (spin-LEDs), yet achieving devices high dissymmetry factors at room temperature remains a significant challenge due to the difficulty in creation of nonequilibrium population. Here, we demonstrate quasi-two-dimensional (2D) perovskite fluorescence and its spin-LED based on chiral-induced selectivity (CISS). By incorporating an achiral organic spacer chiral quasi- 2D film, engineer type II interface within film guarantee effective interphase carrier transfer from low-n quantum well (QW) large exciton binding energy high-n QW. In addition, uniformly vertically distributed QW (n = 1) random orientations is favorable tunneling through spacers hence improved CISS efficiency. Finally, realize |gCP-EL| ∼0.103. Our research reveals that instead solely concentrating limited choice, employing adjust film's landscape, distribution, arrangement more approach achieve emission quasi-2D film.

Language: Английский

Citations

14
Chiral-induced spin selectivity in electrocatalysis DOI
Sujun Zheng, Hong Chen, Shuang‐Quan Zang

et al.

Matter, Journal Year: 2025, Volume and Issue: 8(2), P. 101924 - 101924

Published: Feb. 1, 2025

Language: Английский

Citations

1
Utilizing Shear Piezoelectricity of Chiral Lead‐Free Metal Halides for Electromechanical Sensing DOI
Yong‐Ji Gong, Lian‐Cai An, Ying Zhang

et al.

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(38)

Published: April 13, 2024

Abstract Chiral hybrid metal halides have emerged as a promising class of piezoelectric materials owing to their ease synthesis, low acoustic impedance, and solution processibility. However, many known chiral crystalize in structures with only shear piezoelectricity which is less facile be utilized compared the longitudinal piezoelectricity, largely preventing practical utility. In addressing this problem, lead‐free S‐ MPBiCl 5 R‐ (MP = 2‐methylpiperazinium) are synthesized thin films orientating along polarization direction fabricated. These orientated films, characterized by numerous grains compact grain boundaries, can effectively facilitate boundary sliding convert normal stress into stress, thus facilely activating piezoelectricity. The resulting devices accurately identify position type ultrasound sources without need for complex impedance matching layer. Moreover, these successfully sense delicate variations momentum caused table tennis balls. findings open up new pathway utilize that normally considered unuseful other molecular piezoelectrics.

Language: Английский

Citations

8
Mechanically Tunable Circularly Polarized Luminescence of Liquid Crystal‐Templated Chiral Perovskite Quantum Dots DOI
Xuan Zhang, Lin Li, Yuanhao Chen

et al.

Angewandte Chemie, Journal Year: 2024, Volume and Issue: 136(22)

Published: March 25, 2024

Abstract Endowing perovskite quantum dots (PQDs) with circularly polarized luminescence (CPL) offers great promise for innovative chiroptical applications, but the existing strategies are inefficient in acquiring stimuli‐responsive flexible chiral films large, tunable dissymmetry factor ( g lum ) and long‐term stability. Here, we report a strategy design synthesis of luminescent cholesteric liquid crystal elastomer (Lumin‐CLCE) mechanically CPL, which is enabled by crystal‐templated self‐assembly situ covalent cross‐linking judiciously designed photopolymerizable CsPbX 3 (X=Cl, Br, I) PQD nanomonomers into elastic polymer networks. The resulting Lumin‐CLCE showcase structural color natural light noticeable CPL maximum value up to 1.5 under UV light. manipulation intensity rotation direction achieved controlling self‐assembled helicoidal nanostructure handedness soft helices. A significant breakthrough lies achievement reversible, perovskite‐based switch activated biaxial stretching, enables flexible, dynamic anti‐counterfeiting labels capable decrypting preset information specific polarization states. This work can provide new insights development advanced materials their emerging applications encryption, 3D displays, beyond.

Language: Английский

Citations

7
Chiral three-dimensional organic–inorganic lead iodide hybrid semiconductors DOI Creative Commons
Chang‐Chun Fan, Chengdong Liu, Bei‐Dou Liang

et al.

Chemical Science, Journal Year: 2024, Volume and Issue: 15(29), P. 11374 - 11381

Published: Jan. 1, 2024

Chiral three-dimensional lead iodide hybrids were constructed by introduction of chiral cations. The compounds exhibit BPVE, chiroptical properties, and Rashba–Dresselhaus effect, offering prospects for chiroptic spintronic applications.

Language: Английский

Citations

6
Structure-Guided Approaches for Enhanced Spin-Splitting in Chiral Perovskite DOI Creative Commons
Zijin Ding, Quanlin Chen, Yuanzhi Jiang

et al.

JACS Au, Journal Year: 2024, Volume and Issue: 4(4), P. 1263 - 1277

Published: March 21, 2024

Hybrid organic–inorganic perovskites with diverse lattice structures and chemical composition provide an ideal material platform for novel functionalization, including chirality transfer. Chiral combine organic inorganic sublattices, therefore encoding the structural asymmetry into electronic giving rise to spin-splitting effect. From a chemistry perspective, magnitude of effect crucially depends on noncovalent electrostatic interaction within chiral perovskite, which induces local site long-range bulk inversion symmetry breaking. In this regard, we systematically retrospect structure–property relationships in perovskite. Insight rational design based molecular configuration, dimensionality, along their effects manifestation is presented. Lastly, challenges purposeful further integration perovskite-based spintronic devices are outlined. With understanding fundamental physics, believe that Perspective will propel application multifunctional devices.

Language: Английский

Citations

4
Experimental Evidence of the Molecular and Macroscopic Origins of Circular Dichroism in Chiral Metal‐Halide Networks DOI
Alexandre Abhervé

Advanced Optical Materials, Journal Year: 2024, Volume and Issue: 12(19)

Published: May 25, 2024

Abstract Clockwise or counter‐clockwise spin coating? In the current hot research topic of chiral metal‐halide semiconductors, several investigations have been undertaken in order to reveal their natural optical activity and reported dissymmetry factors ( g abs ) for thin films many hybrid compounds, usually without considering macroscopic anisotropies inherent solid‐state samples. Yet, CD solid state can be strongly modulated by co‐existence linear dichroism (LD) birefringence (LB). Theoretical studies recently revealed importance such interferences response samples, often referred as symmetric (sLDLB) antisymmetric (aLDLB) effects. Based on newly synthesized one‐dimensional lead‐halide networks formula S/R ‐HP1A)PbBr 3 ‐HP1A)PbI , an experimental method accurately discriminate between CD, sLDLB aLDLB is here presented. The main conditions influencing amplitude are also highlighted, concentration precursor solution spin‐coating rotation direction, finally providing a complete guide forthcoming chiroptical important family materials.

Language: Английский

Citations

4
Hydrogen Bonding Analysis of Structural Transition-Induced Symmetry Breaking and Spin Splitting in a Hybrid Perovskite Employing a Synergistic Diffraction-DFT Approach DOI
Yi Xie, Gabrielle Koknat, Nicholas J. Weadock

et al.

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(32), P. 22509 - 22521

Published: July 31, 2024

Two-dimensional (2D) hybrid organic–inorganic perovskites (HOIPs) offer an outstanding opportunity for spin-related technologies owing in part to their tunable structural symmetry breaking and distortions driven by hydrogen (H) bonds. However, understanding how H-bonds tailor inorganic therefore enhance spin splitting more effective manipulation remains imprecise due challenges measuring H atom positions using X-ray diffraction. Here, we report a thermally induced transition (at ∼209 K) 2D HOIP, (2-BrPEA)2PbI4 [2-BrPEA = 2-(2-bromophenyl)ethylammonium], which induces inversion asymmetry strong (ΔE > 30 meV). While diffraction generally establishes heavy coordinates, utilize neutron accurate position determination, demonstrating that the transition-induced rearrangement of with distinct bond strengths asymmetrically shifts associated iodine positions. Consequences this shift include increased asymmetry, enhanced difference between adjacent interoctahedra (i.e., Pb–I–Pb angles), significant splitting. We further show H-only density-functional theory (DFT) relaxation structure atoms are consistent experimental data, validating convenient pathway improve upon HOIP H-bonding analyses derived from quicker/less-expensive data.

Language: Английский

Citations

4