A Low‐Temperature‐Resistant Flexible Organic Crystal with Circularly Polarized Luminescence

Pan, Xiuhong; Zheng, Anyi; Yu, Xu; Qi, Di; Li, Liang; Duan, Pengfei; Ye, Kaiqi; Naumov, Panče; Zhang, Hongyu

doi:10.1002/anie.202203938

Cited by 40 publications

(32 citation statements)

References 74 publications

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“…(10.0 × 10 –3 and −6.0 × 10 –3 ) (see also Table S8). The absence of perfect mirror CPL spectra for these solid enantiomer powder samples could be due to aggregation inhomogeneity in the solid state. , …”

Section: Resultsmentioning

confidence: 97%

“…The absence of perfect mirror CPL spectra for these solid enantiomer powder samples could be due to aggregation inhomogeneity in the solid state. 62,63 Because of the noncentrosymmetric nature of these materials, the SHG properties were also investigated. Using potassium dihydrogen phosphate (KDP) as the reference, SHG measurements were performed on polycrystalline powders under 1064 nm laser irradiation at ambient temperature.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Chiral 2D Cu(I) Halide Frameworks

Geng

Zhang

et al. 2022

Chem. Mater.

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Hybrid multifunctional materials have great potential in a wide variety of applications due to their flexible combination of organic and inorganic components. Introducing chiral organic modules into the metal halide frameworks can effectively generate multifunctional materials, achieving new functionalities with noncentrosymmetric structures. Here, by incorporating (R)-or (S)-piperidine-3-carboxylic acid (R/S-PCA) as the templating cation, we report the synthesis and characterization of three pairs of new 2D chiral hybrid Cu(I) halides, namely, (R/S-PCA)CuBr 2 , (R/S-PCA)CuBr 2 •0.5H 2 O, and (R/S-PCA)CuI 2 . These chiral Cu(I) halides crystallize in the noncentrosymmetric space group C2 and belong to a new structural type similar to layered silicates. The optical absorption edges of these chiral materials can be tuned by changing the halide or upon the absorption of water and range from 2.70 to 3.66 eV. A dynamic conversion between (R/S-PCA)CuBr 2 and (R/S-PCA)CuBr 2 •0.5H 2 O occurs through exposure to moisture or vacuum drying along with changes in the reversible bandgap and photoluminescence. Chiroptical properties such as circular dichroism, circular polarized light emission, and second harmonic generation are investigated. Density functional theory calculations (DFT) show the indirect and direct bandgap natures of these Cu(I) halides and reveal the mechanism for the broadband self-trapped exciton emission at the excited state. The fascinating structural type, chiroptical properties, and reversible hydrochromic behavior of these Cu(I)-based halides make them viable candidates for next-generation multifunctional optoelectronic materials.

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Section: Resultsmentioning

confidence: 97%

Section: ■ Results and Discussionmentioning

confidence: 99%

Chiral 2D Cu(I) Halide Frameworks

Geng

Zhang

et al. 2022

Chem. Mater.

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“…This indicated that the ground and excited states of 1R and 2S have similar conformations. [ 5b ] The magnitude of CPL were assessed by the luminescence dissymmetry factor ( g lum ), which is defined as g lum = 2( I R − I S )/( I R + I S ), where I R and I S represent the right‐ and left‐handed CPL intensities, respectively. Experimentally, g lum is defined as g lum 2 × ln10 × [ellipticity/(32 980 × total PL intensity].…”

Section: Resultsmentioning

confidence: 99%

“…[ 2 ] Particularly, in comparison with metal‐doped materials, chiral luminescent materials do not suffer from phase separation and the polarization of the CPL can be manipulated chemically. [ 3 ] Therefore, in the past few years, great efforts have been devoted to developing new CPL‐active chiral materials, such as lanthanide complexes, [ 4 ] organic molecules, [ 5 ] coordination polymers, [ 2b,c,6 ] and hybrid metal halide perovskites. [ 7 ] In addition, single‐component white‐light emissive materials have been considered as the most promising solid‐state lighting emitters, which have superiorities in color reproducibility, simple fabrication, and low cost with respect to the traditional tricomponent or two‐component emitters.…”

Section: Introductionmentioning

confidence: 99%

Moisture‐Resistant Chiral Perovskites for White‐Light Circularly Polarized Photoluminescence

Wang

et al. 2022

Advanced Optical Materials

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modern technologies including 3D display, information encryption, spin optical communication, and quantum-based optical computation. [1] In contrast to traditional CPL techniques based on additional linear polarizers and quarter-wave plates, chiral and magnetic metal-doped luminescent materials that can realize CPL directly, have risen to prominence on account of their superiorities in device integration and miniaturization. [2] Particularly, in comparison with metal-doped materials, chiral luminescent materials do not suffer from phase separation and the polarization of the CPL can be manipulated chemically. [3] Therefore, in the past few years, great efforts have been devoted to developing new CPL-active chiral materials, such as lanthanide complexes, [4] organic molecules, [5] coordination polymers, [2b,c,6] and hybrid metal halide perovskites. [7] In addition, single-component white-light emissive materials have been considered as the most promising solid-state lighting emitters, which have superiorities in color reproducibility, simple fabrication, and low cost with respect to the traditional tricomponent or two-component emitters. [8] Nevertheless, though a few samples have been reported, [9] the exploration of chiral materials with white-CPL remains a challenge.The past decade has witnessed the striking progress of the lowdimensional organic-inorganic hybrid perovskites in optoelectronic devices such as photovoltaic cells, [10] photodetectors, [11] and light-emitting diodes, [12] profiting from their large optical absorption efficiency, high carrier mobility, tunable bandgap, and lowcost solution processability. Particularly, the excellent structural flexibility of low-dimensional hybrid perovskites allows the incorporation of diverse organic cations, providing a new platform to design CPL-active materials. [13] For instance, CPL has been achieved in several low-dimensional hybrid perovskites, [9b,14] such as (R/Smethylbenzylammonium) 2 PbI 4 , [3b,7b] (R/S)-3-(fluoropyrrolidinium) MnBr 3 , [15] and (R/S-2-methylpiperazine)) 3 Pb 2 Br 10 •2DMAc (DMAc = N,N-dimethylacetamide). [9b] In addition, the strong quantum confinement in low-dimensional hybrid perovskites can promote exciton-phonon interaction to generate self-trapped excitons (STEs), facilitating the realization of broadband white-light emission. [8b,16] Thus, low-dimensional hybrid perovskites become promising candidates for broadband white-CPL. However, chiral hybrid perovskites with CPL are still rare due to the relatively high Circularly polarized luminescence (CPL) has recently caught increasing attention owing to its widespread applications from 3D display to quantum-based optical computation. Among various CPL-active materials, low-dimensional hybrid perovskites have risen to prominence, benefiting from their excellent structural flexibility and optoelectronic properties. However, the exploration of hybrid perovskites with white-CPL remains a challenge and most of them suffer from moisture instability. Here, a pair of moisture-resi...

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“…158 Since 2018, Zhang's team systematically explored the application of adaptive crystals in the field of optical waveguides based on a series of derivatives of single-benzene, Schiff base compounds, β-diketone derivatives, hydrazone compounds, and anthracene derivatives. 79,88–105 In addition, mechanically reconfigurable organic crystals could also be used for amplifying spontaneous emission and in polarization rotators, which broaden their applications in different scenarios. 31,106–115…”

Section: Photoluminescent Flexible Crystalline Materialsmentioning

confidence: 99%