Ligand Chemistry of Inorganic Lead Halide Perovskite Nanocrystals

ACS Energy Letters, Год журнала: 2023, Номер 8(2), С. 1152 - 1191

Опубликована: Янв. 26, 2023

Lead halide perovskite nanocrystals (LHP NCs) have emerged as next-generation semiconductor materials with outstanding optical and optoelectronic properties. Because of the high surface-to-volume ratio, performance colloidal stability LHP NCs largely depend on their surface chemistry, especially ligands termination. On one hand, capping improve luminescence; other hand highly dynamic binding nature is detrimental to photoluminescence NCs. In addition, functionalization desired molecules induces new functionalities such chirality, light harvesting, triplet sensitization through energy/electron transfer or use X-ray detectors. this review, we present current understanding an atomic view chemistry NCs, including crystal termination, vacancies, different types ligands. Furthermore, discuss ligand-induced functionalities, photocatalysis chirality.

Язык: Английский

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Broadband Emission Origin in Metal Halide Perovskites: Are Self‐Trapped Excitons or Ions?

Advanced Materials, Год журнала: 2023, Номер 35(51)

Опубликована: Март 29, 2023

Abstract It has always been a goal to realize high efficiency and broadband emission in single‐component materials. The appearance of metal halide perovskites makes it possible. Their soft lattice characteristics significant electron–phonon coupling synergistically generate self‐trapped excitons (STEs), contributing with large Stokes shift. Meanwhile, their structural/compositional diversity provides suitable active sites coordination environments for doping ns 2 ions, allowing 3 P n ( =0,1,2) → 1 S 0 transitions toward emission. ions is phenomenologically similar that STE emission, hindering in‐depth understanding origin, leading failure meet the design requirements practical applications. In this scenario, herein, fundamentals development such two mechanisms are summarized establish clear comprehensive phenomenon, which may pave way an ideal customization broadband‐emission perovskites.

Язык: Английский

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Chiral Hybrid Copper(I) Halides for High Efficiency Second Harmonic Generation with a Broadband Transparency Window

Angewandte Chemie International Edition, Год журнала: 2022, Номер 61(10)

Опубликована: Янв. 10, 2022

Chiral hybrid organic-inorganic metal halides (HOMHs) with intrinsic noncentrosymmetry have shown great promise for applications in second-order nonlinear optics (NLO). However, established chiral HOMHs often suffer from their relatively small band gaps, which lead to negative impacts on transparent window and laser-induced damage thresholds (LDT). Here, we synthesized two based CuI halides, namely (R-/S-MBA)CuBr2 , feature well-balanced NLO performances a highly efficient SHG response, outstanding optical transparency, high LDT. The effective coefficient of (R-MBA)CuBr2 has been determined be ≈24.7 pm V-1 is orders magnitude higher than that CuII counterparts. This work shows the promising potential -based photonic wide wavelength regions.

Язык: Английский

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Rational Design of Non-Centrosymmetric Hybrid Halide Perovskites

Journal of the American Chemical Society, Год журнала: 2023, Номер 145(2), С. 1378 - 1388

Опубликована: Янв. 3, 2023

Structural non-centrosymmetry in semiconducting organic-inorganic hybrid halide perovskites can introduce functionalities like anomalous photovoltaics and nonlinear optical properties. Here we a design principle to prepare Pb- Bi-based two- one-dimensional with polar non-centrosymmetric space groups. The relies on creating dissimilar hydrogen halogen bonding non-covalent interactions at the interface. For example, organic cations I-(CH2)3-NH2(CH3)+ (MIPA), -CH3 is substituted by -CH2I one end, -NH3+ -NH2(CH3)+ other end. These substitutions of two -H atoms -I reduce rotational symmetry MIPA both ends, compared an unsubstituted cation, for H3C-(CH2)3-NH3+. Consequently, hydrogen-iodine iodine-iodine interface (MIPA)2PbI4 2D break local inversion symmetries Pb-I octahedra. Owing this non-centrosymmetry, displays visible infrared tunable properties second third harmonic generation susceptibility values 5.73 pm V-1 3.45 × 10-18 m2 V-2, respectively. Also, single crystal shows photocurrent shining light no external bias, exhibiting photovoltaic effect arising from structural asymmetry. strategy was extended synthesize four new perovskite compounds. Among them, (H3N-(CH2)3-NH(CH3)2)BiI5 7.3 high open-circuit voltage 22.6 V.

Язык: Английский

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A review of the relationship between the structure and nonlinear optical properties of organic-inorganic hybrid materials

Coordination Chemistry Reviews, Год журнала: 2023, Номер 498, С. 215458 - 215458

Опубликована: Окт. 6, 2023

Язык: Английский

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Chiral Hybrid Germanium(II) Halide with Strong Nonlinear Chiroptical Properties

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(41)

Опубликована: Авг. 23, 2023

Due to the pronounced anisotropic response circularly polarized light, chiral hybrid organic-inorganic metal halides have been regarded as promising candidates for application in nonlinear chiroptics, especially second-harmonic generation circular dichroism (SHG-CD) effect. However, designing novel lead-free with large anisotropy factors and high laser-induced damage thresholds (LDT) of SHG-CD remains challenging. Herein, we develop first germanium halide, (R/S-NEA)3 Ge2 I7 ⋅H2 O (R/S-NGI), systematically investigated its linear chiroptical properties. S-NGI R-NGI exhibit (gSHG-CD ) 0.45 0.48, respectively, along a LDT 38.46 GW/cm2 ; these were highest values among reported halides. Moreover, effective second-order optical coefficient could reach up 0.86 pm/V, which was 2.9 times higher than that commercial Y-cut quartz. Our findings facilitate new avenue toward halides, their implementation applications.

Язык: Английский

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Bright Circularly Polarized Mechanoluminescence from 0D Hybrid Manganese Halides

Advanced Materials, Год журнала: 2024, Номер 36(15)

Опубликована: Янв. 17, 2024

Hybrid metal halides (HMHs) with efficient circularly polarized luminescence (CPL) have application prospects in many fields, due to their abundant host-guest structures and high photoluminescence quantum yield (PLQY). However, CPLs HMHs are predominantly excited by light or electricity, limiting use multivariate environments. It is necessary explore a novel excitation method extend the of chiral as smart stimuli-responsive optical materials. In this work, an enantiomeric pair 0D hybrid manganese bromides, [H

Язык: Английский

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Rationalizing the design and implementation of chiral hybrid perovskites

Chem, Год журнала: 2022, Номер 8(5), С. 1231 - 1253

Опубликована: Фев. 16, 2022

Язык: Английский

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Highly Anisotropic Second-Order Nonlinear Optical Effects in the Chiral Lead-Free Perovskite Spiral Microplates

Nano Letters, Год журнала: 2023, Номер 23(2), С. 606 - 613

Опубликована: Янв. 9, 2023

Chiral metal halide perovskites with intrinsic asymmetric structures have drawn increased research interest for the application of second-order nonlinear optics (NLO). However, designing chiral features a large NLO coefficient, high laser-induced damage thresholds (LDT), and environmental friendliness remains major challenge. Herein, we synthesized two hybrid bismuth halides: (R/S-MBA)4Bi2Br10 spiral structure microplates, templated by (R/S)-methylbenzylamine (R/S-MBA). The as-grown lead-free perovskite microplates exhibit recorded second harmonic generation (SHG) effect effective coefficient (deff) 11.9 pm V-1 LDT up to 59.2 mJ cm-2. More importantly, twisted screw show competitive circular polarization sensitivity at 1200 nm an anisotropy factor (gSHG-CD) 0.58, which is about 3 times higher than that reported Pb-based perovskites. These findings provide new platform design multifunctional photonic applications.

Язык: Английский

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Free Halogen Substitution of Chiral Hybrid Metal Halides for Activating the Linear and Nonlinear Chiroptical Properties

Journal of the American Chemical Society, Год журнала: 2023, Номер 145(49), С. 26833 - 26842

Опубликована: Дек. 1, 2023

Halogen substitution has been proven as an effective approach to the band gap engineering and optoelectronic modulation of organic–inorganic hybrid metal halide (OIHMH) materials. Various high-performance mixed OIHMH film materials have primarily obtained through coordinated halogens in their inorganic octahedra. Herein, we propose a new strategy free halogen outside octahedra for constructing single crystals with chiral structures, resulting boost linear nonlinear chiroptical properties. The from DMA4[InCl6]Cl (DMA = dimethylammonium) DMA4[InCl6]Br facile antisolvent vaporization method produces centimeter-scale high thermal stability along quantum yield photoluminescence, conspicuous circularly polarized luminescence, greatly enhanced second harmonic generation (SHG). In particular, crystal features intrinsic structure, exhibiting significant SHG circular dichroism (SHG-CD) response highest reported anisotropy factor (gSHG-CD) 1.56 among enhancements both properties are directly attributed octahedral distortion. by confine introduced within sites lattice, thereby ensuring compositions successful employment such may broaden horizon regulation structures

Язык: Английский

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