Advanced Optical Materials
·
2026
·Vol. 14
·期 34
·e71654
·
IF 7.2
Jiaqi Zhao,Yuan Wang,Laipeng Sun,Ting Li,Yu Wang
A defect-induced strategy is employed to synthesize chiral zero-dimensional Cs 4 PbBr 6 perovskite nanocrystals (NCs) with blue photoluminescence via a phase transformation process. Both the circular dichroism (CD) and circularly polarized luminescence (CPL) spectra of them exhibit characteristic mirror-symmetric signals, confirming the presence of ground-state chirality and excited-state chirality. The transmission electron microscopy (TEM) images and electron paramagnetic resonance spectra (EPR) indicate that the strong blue photoluminescence and CPL response originate from the generation of bromine defects. Particularly, the change in the ratio of ligands not only leads to CD inversion, but also can give rise to CPL inversion. The Ultrafast spectroscopy transient absorption (TA) spectra further show that the CPL response of chiral Cs 4 PbBr 6 NCs originates from the spin-polarization process. The reversal of the CPL signal can be attributed to the changes of energy band structure due to conformational changes with respect to S/R -MBA (MBA = α-Methylbenzylamine) ligands in chiral perovskite NCs. It indicates that the conformational change of chiral ligands can modulate the energy band structure of chiral Cs 4 PbBr 6 perovskite NCs with keeping the crystallographic structure constant. Furthermore, the universality of the defect induction strategy can be confirmed by using EBA (EBA = ethylbenzylamine), CHEA (CHEA = cyclohexylethylamine), and NEA (NEA = 1-(1-Naphthyl) ethylamine) as chiral precursors.
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Inorganic Chemistry Frontiers
·
2025
·
IF 6.4
Quanlin Chen,Yangbin Xu,Qingming Wu,Yanxing Feng,Zhiqiang Huang,Hai Jia,Shaoming Ying,Xiaohui Huang
Accurate and chip-integrated full-Stokes polarization detection is essential for advancing multifunctional optoelectronic systems. However, conventional approaches relying on optical filters often suffer from significant optical losses and poor sensitivity under weak-light conditions. Here, we report an efficient full-Stokes polarimeter based on a 1D chiral-polar perovskite, (R/S-NEA)PbI3. The intrinsic anisotropic and chiral structure of the (R/S-NEA)PbI3 single crystal enables both high linear and circular polarization sensitivity. Moreover, the polar structure induces a giant bulk photovoltaic effect (BPVE) of up to 8 V, enabling efficient carrier extraction under zero bias and significantly suppressing noise currents to the ∼fA level, resulting in an exceptional specific detectivity of 4.1 × 1013 Jones. These combined properties enable accurate, self-powered full-Stokes polarization detection, with the fabricated single-crystal-based polarimeter achieving an average Stokes parameter error (ΔS1–3) of less than 3%. Notably, the polarimeter demonstrates an ultra-low detection limit of 0.4 μW cm−2, representing the highest sensitivity among comparable polarimeters reported to date. With easy on-chip integration, the polarimeter showcases precise full-Stokes imaging capabilities.
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Molecular Catalysis
·
2023
·
IF 4.6
Nan Jiang,Xiaotong Du,Liangyu Zheng
In this study, a series of chiral lactams were successfully prepared by one-pot two-step reactions. It included a transamination reaction catalyzed by a ω -transaminase from Bacillus megaterium ( ω -TA Bm ), and subsequent spontaneous cyclisation. The different amine donors were firstly screened with ethyl levulinate as an amine acceptor, and both the excellent conversion and enantiomeric excess ( e.e. p ) of >99% could be achieved with 4-bromophenylethylamine as an amine donor, however, the long reaction time of 24 h was unfavorable for its application. After the amino acid residue Thr120 situated in the small pocket was mutated to Ser, the T120S variant could exhibit 10.6-fold higher activity comparing to that of wild type, and achieve the reaction with both conversion and e.e. p of >99% within 3 h. The T120S variant could also be applied to prepare the other chiral γ- and δ-lactams with excellent conversion and e.e. p . Furthermore, the inclusion bodies of ω -TA Bm and its variants could be aggregated as “native-like structures” to continuously prepare the chiral lactam for 18 h. The aim of the study is to provide a simply and efficiently biocatalytic route for preparing chiral lactams.
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ADVANCED MATERIALS
·
2025
·
IF 26.8
Jingwen Yao,Yuling Huang,Haifeng Sun,Zhiyu Wang,Jie Xue,Zhifeng Huang,Shou-Cheng Dong,Xihan Chen,Haipeng Lu
Spin light-emitting diodes (spin-LEDs) are important for spin-based electronic circuits as they convert the carrier spin information to optical polarization. Recently, chiral-induced spin selectivity (CISS) has emerged as a new paradigm to enable spin-LED as it does not require any magnetic components and operates at room temperature. However, CISS-enabled spin-LED with tunable wavelengths ranging from red to near-infrared (NIR) has yet to be demonstrated. Here, chiral quasi-2D perovskites are developed to fabricate efficient spin-LEDs with tunable wavelengths from red to NIR region by tuning the halide composition. The optimized chiral perovskite films exhibit efficient circularly polarized luminescence from 675 to 788 nm, with a photoluminescence quantum yield (PLQY) exceeding 86% and a dissymmetry factor ( g lum ) ranging from 8.5 × 10 −3 to 2.6 × 10 −2 . More importantly, direct circularly polarized electroluminescence (CPEL) is achieved at room temperature in spin-LEDs. This work demonstrated efficient red and NIR spin-LEDs with the highest external quantum efficiency (EQE) reaching 12.4% and the electroluminescence (EL) dissymmetry factors ( g EL ) ranging from 3.7 × 10 −3 to 1.48 × 10 −2 at room temperature. The composition-dependent CPEL performance is further attributed to the prolonged spin lifetime as revealed by ultrafast transient absorption spectroscopy.
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高影响因子
Journal of the American Chemical Society
·
2024
·
IF 14.4
Jingwen Yao,Zhiyu Wang,Yuling Huang,Jie Xue,Dengliang Zhang,Jiangshan Chen,Xihan Chen,Shou-Cheng Dong,Haipeng Lu
Introducing molecular chirality into perovskite crystal structures has enabled the control of carrier spin states, giving rise to circularly polarized luminescence (CPL) in thin films and circularly polarized electroluminescence (CPEL) in LEDs. Spin-LEDs can be fabricated either through a spin-filtering layer enabled by chiral-induced spin selectivity or a chiral emissive layer. The former requires a high degree of spin polarization and a compatible spinterface for efficient spin injection, which might not be easily integrated into LEDs. Alternatively, a chiral emissive layer can also generate circularly polarized electroluminescence, but the efficiency remains low and the fundamental mechanism is elusive. In this work, we report an efficient green LED based on quasi-two-dimensional (quasi-2D) chiral perovskites as the emitting layer (EML), where CPEL is directly produced without separate carrier spin injection. The optimized chiral perovskite thin films exhibited strong CPL at 535 nm with a photoluminescence quantum yield (PLQY) of 91% and a photoluminescence dissymmetry factor (glum) of 8.6 × 10–2. Efficient green spin-LEDs were successfully demonstrated, with a large EL dissymmetry factor (gEL) of 7.8 × 10–2 and a maximum external quantum efficiency (EQE) of 13.5% at room temperature. Ultrafast transient absorption (TA) spectroscopic study shows that the CPEL is generated from a rapid energy transfer accompanied by spin transfer from 2D to 3D perovskites. Our study not only demonstrates a reliable approach to achieve high performance spin-LEDs but also reveals the fundamental mechanism of CPEL with an emissive layer of chiral perovskites.
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ADVANCED MATERIALS
·
2024
·Vol. 36
·期 29
·2400493
·
IF 27.4
Quanlin Chen,Zijin Ding,Li Zhang,Di Wang,Cong Geng,Yanxing Feng,Jia Zhang,Miao Ren,Saisai Li,Saif M. H. Qaid,Yuanzhi Jiang,Mingjian Yuan
Full-Stokes polarization detection, with high integration and portability, offers an efficient path toward next-gen multi-information optoelectronic systems. Nevertheless, current techniques relying on optical filters create rigid and bulky configurations, limiting practicality. Here, a flexible, filter-less full-Stokes polarimeter featuring a uniaxial-oriented chiral perovskite film is first reported. It is found that, the strategic manipulation of the surfactant-mediated Marangoni effect during blade coating, is crucial for guiding an equilibrious mass transport to achieve oriented crystallization. Through this approach, the obtained uniaxial-oriented chiral perovskite films inherently possess anisotropy and chirality, and thereby with desired sensitivity to both linearly polarized light and circularly polarized light vectors. The uniaxial-oriented crystalline structure also improves photodetection, achieving a specific detectivity of 5.23 × 10 13 Jones, surpassing non-oriented devices by 10×. The as-fabricated flexible polarimeters enable accurate capture of full-Stokes polarization without optical filters, exhibiting slight detection errors for the Stokes parameters: Δ S 1 = 9.2%, Δ S 2 = 8.6%, and Δ S 3 = 6.5%, approaching the detection accuracy of optics-filter polarimeters. This proof of concept also demonstrates applications in matrix polarization imaging.
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