Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 22
·8815-8823
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IF 8.067
Runda Guo,Weizhuo Zhang,Xin Li,Linyuan Lian,Hongting Chen,Chencheng Peng,Liang Sun,Shiyuan Liu,Jianbing Zhang,Lei Wang
Blue emitting CsPb(Br–Cl)3 perovskite nanoparticles (NPs) play an important role in optoelectronic applications. However, the synthesis of stable blue perovskite NPs with excellent photoluminescence quantum yield (PLQY) is still challenging. Here, a new strategy of conveniently using strontium halides and amine halides for simultaneous doping and surface passivation of CsPb(Br–Cl)3 perovskite NPs is proposed. Through experimental studies and calculations, it is found that divalent Sr2+ cations can partly replace the B-site Pb2+ ions in the lattice structure of perovskite NPs and cause a slight lattice contraction, not only passivating the defects but also providing chances for bluer NPs. As a result, the deep-blue CsPb(Br–Cl)3 perovskite NPs with PL emission centered at 455 nm and a high PLQY of 96% were obtained. In addition, a white light-emitting device (WLED) with the NPs as an emissive layer exhibited a maximum power efficiency of 76 lm W−1 with Commission International de L’Eclairage (CIE) coordinates of (0.33, 0.34). These findings provide fundamental insights into the excited state dynamics of colloidal cesium lead halide (CsPbX3) perovskite NPs that can be used as components of LEDs for practical applications.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2021
·
IF 6.986
Jing Hu,Hanjiao Chen,Xiaoming Jiang,Xiandeng Hou
Herein, we report a discovery that photochemical vapor generation (PCVG) of halides (bromide, chloride, and fluoride) can be realized in organic-acid-free media, with figures of merit comparable to those in classical scenarios employing acetic acid. Metal acetates, copper salts, and mixtures of different acetates and copper salts were evaluated for their performance in facilitating PCVG of halides; the formation of copper acetate complexes turned out to play a crucial role. Methyl halides (CH3X, X = Br, Cl, F) were identified by gas chromatography–mass spectrometry (GC–MS) as principal volatile compounds. Several important intermediate species, including cuprous ions (Cu+), methyl (•CH3), and hydroxyl (•OH) free radicals, were confirmed using cuproine, 2,2,6,6-tetramethylpiperidin-1-oxyl (TEMPO), and coumarin as a chromogenic agent, radical tracer, and fluorescence probe based on UV–vis, GC–MS, and fluorescence spectroscopy, respectively. The ligand to metal charge transfer (LMCT) between acetate and copper and the charge transfer to solvent (CTTS) excitation of halides were considered to account for the generation of methyl halides in organic-acid-free media. The presence of 100 and 200 μg mL–1 of CuAc2, as well as sample delivery rates of 10.7 and 3.3 mL min–1, yielded limits of detection of 0.03 and 3 μg L–1 for Br– and Cl–, respectively, by inductively coupled plasma mass spectrometry (ICPMS). The method was applied to the analysis of bottled water and seawater, achieving spike recoveries between 92 and 101%.
研究领域:
分析化学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
·
2013
·
IF 3.187
Ling Wang,Sa-Sa Wang,Giang VO-Thanh,Ye Liu
An ionic compound, bis[1-methyl-3-(3′-sulfopropyl)imidazolium] hexafluorotitanate ( 1 ), was proved to be the efficient and recyclable catalyst for the oxidative halogenations of arenes in water using H 2 O 2 as the oxidant and halide salts as the halogenation sources. The mono-halogenated products were obtained selectively by this method. The synergetic catalytic effect coming from the two incorporated functionalities of SO 3 H and [TiF 6 ] 2− was manifested in 1 . The halogenation rate catalyzed by 1 was in the ranking of NaBr ≫ NaCl > KI. The UV–vis and FT-IR analyses indicated that the successful formation and regeneration of the active peroxo-Ti species ( 1A ) with the aid of proton acid guaranteed the recycling uses of 1 .
研究领域:
有机化学
·
催化化学
✓ 已验证
DOI
高影响因子
Materials Today Chemistry
·
2023
·
IF 7.3
D.-Y. Li,Y.-H. Liu,Q. Wang,X.-W. Lei,C.-Y. Yue,Z.-H. Jing
To solve the toxicity problem of blue light emissive three-dimensional lead halide perovskite , zero-dimensional lead-free hybrid halides with low cost and high emission efficiency have become one of the most promising solid-state light emitting materials. Herein, by utilizing discrete [ZnBr 4 ] 2− tetrahedrons as optical center, a new series of organic–inorganic hybrid zinc halides of AZnBr 4 (A = NMPz, MPz, and AMPd) were presented as blue light emitters. Excitingly, these zero dimensional halides exhibit bright blue-light emission with the highest photoluminescence quantum yield of 17.28%, acting as down-conversion phosphors to assembly high-performance white-light emitting diode.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Fei Yang,Xinbo Zhang,Zixuan Zhao,Wenshan Guo,Huu Hao Ngo
The transformation of halogenated organics in advanced oxidation processes (AOPs) has been extensively investigated. However, we currently know little about the fate of halogenated pollutants in the presence of exogenic halides (Cl − or Br − ). Herein, the degradability , mineralization rate, and accumulation capacity of adsorbable organic halogen (AOX) for chlorophenols (2-chlorophenol (2-CP), 3-chlorophenol (3-CP), 4-chlorophenol (4-CP), and 2,4,6-trichlorophenol (TCP)) were compared in the Fe 2+ /persulfate (PS) process with the addition of exogenic halides. Results indicate that exogenic X − can lead to a decrease in chlorophenols degradation and mineralization rate, undesirable accumulation of AOX, and generation of halogenated by-products which are more toxic than precursor chlorophenols. Results of kinetics modeling show that Cl 2 •- plays more important role than SO 4 •- with an addition of Cl − , while SO 4 •- , Br 2 •- , and Br 2 are responsible for the effect of Br − . As well, the effect of endogenic chlorine atoms on chlorophenols reveals that the degradability and AOX formation potential of 3-CP are highest while that of TCP are the lowest. This study demonstrates the significant influence of endogenic chlorine atoms and exogenic X − on the fate of typical organic halogen compounds. Consequently, the X − level and position/number of halogen atoms should be considered simultaneously when treating organohalogen compounds .
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Li Tan,Zhishan Luo,Qian Li,Xiaokun Fan,Chao Zou,Bin Xu,Xiaoyong Chang,Yuanzhu Zhang,Zewei Quan
Zero-dimensional (0D) hybrid metal halides (HMHs) have recently garnered significant attention as promising light emitters due to their distinctively Stokes-shifted broadband emissions resulting from self-trapped excitons (STEs). However, the influence of crystalline structures on the Stokes shift remains inadequately understood. Herein, we design and synthesize a series of 0D (Ph 4 P) 2 SbCl 5-x Br x (Ph 4 P = tetraphenylphosphonium, x = 0–5) compounds to elucidate the intrinsic relationship between structural factors and the Stokes shift in 0D Sb(III) halides. Our comprehensive investigations into their crystalline structures and photoluminescence (PL) properties unveil that the Stokes shift correlates with intra- and inter-pyramidal [SbCl 5-x Br x ] 2- units. Specifically, a shorter vertical Sb–Cl bond within the square pyramid, coupled with a greater Sb⋯Sb distance between the pyramidal units, facilitates significant structural relaxation in excited states, resulting in a larger Stokes shift, and vice versa. Notably, this principle applies not only within identical space groups but also across different crystal systems. Furthermore, our findings are supported by analyses of the structures and PL properties of other reported 0D Sb(III) halides with square pyramidal coordination. This study elucidates the structure-dependent nature of the Stokes shift in 0D Sb(III) halides, offering a novel avenue for the design of functional 0D metal halide materials.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Optical Materials
·
2023
·
IF 0
Sijun Cao,Chen Li,Peng He,Jun’an Lai,Kang An,Miao Zhou,Peng Feng,Mi Zhou,Xiaosheng Tang
X-ray indirect detection based on metal halide scintillators has great potential in various applications, such as medical diagnosis, computerized tomography, and quality inspection. However, there are still many limitations in metal halide scintillation materials, such as toxicity, high production costs, and strong self-absorption caused by a band-edge transition limiting the photoluminescence quantum yield (PLQY). Here, (TEA)2MnCl4 and (TBA)2MnCl4 single crystals as scintillators with advanced properties were synthesized from TEAC (tetraethylammonium chloride), TBAC (tetrabutylammonium chloride), and manganese chloride by an antisolvent method at room temperature. These two zero-dimensional organometallic halides exhibit green emission peaking at 512 nm ((TBA)2MnCl4) and 524 nm ((TEA)2MnCl4) with high PLQYs of 99.96% and 65.07%, respectively. The ultrahigh PLQY of (TBA)2MnCl4 benefits from the long Mn–Mn distance in (TBA)2MnCl4. (TBA)2MnCl4 shows an outstanding scintillation performance with a high light yield of 21000 photons/MeV, a low detection limit of 381 nGy/s, and a spatial resolution of 5.6 lp/mm. X-ray imaging experiments demonstrate that the flexible scintillators based on (TEA)2MnCl4 and (TBA)2MnCl4 could be used in high-resolution X-ray imaging.
研究领域:
材料科学
·
光学
·
医学成像
✓ 已验证
DOI
ADVANCED MATERIALS
·
2024
·
IF 27.4
Aqiang Liu,Zheng Zhang,Jing Li,Hui Yu,Nana Wang,Jianpu Wang,Ni Zhao
The halide postdeposition treatment technique is a widely used strategy for mitigating defects in perovskite. However, when applied to mixed-halide perovskites, it often leads to surface and internal halide heterogeneity, which compromises luminescence performance and spectral stability. In this work, blue mixed-halide 3D perovskites are engineered with acetate (Ac⁻)-rich surfaces to optimize the post-treatment process and achieve halide homogeneity. The findings demonstrate that the strong interaction between surface Ac⁻ ions and Pb 2+ ions significantly reduces the formation of halide vacancy defects caused by the washing effect of isopropanol during post-treatment. This defect reduction slows the infiltration of halide ions into the perovskite lattice, providing more time for surface reconstruction and minimizing the accumulation of introduced halide ions at the surface. As a result, a mild halide redistribution occurs, promoting the formation of a uniform mixed-halide perovskite phase. This approach enabled the development of blue mixed-halide 3D PeLEDs with a record external quantum efficiency of 19.28% (emission peak at 482 nm), comparable to state-of-the-art blue reduced-dimensional perovskite-based PeLEDs. Additionally, the device demonstrated a narrowband and stable electroluminescence spectrum with a full width at half maximum (FWHM) of less than 16 nm.
研究领域:
材料科学
·
光电工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Science
·
2024
·Vol. 11
·期 25
·2401194
·
IF 14.3
Guang Wang,Hongzhao Fan,Zhongwei Chen,Yufei Gao,Zuankai Wang,Zhigang Li,Haipeng Lu,Yanguang Zhou
Tuning the thermal transport properties of hybrid halide perovskites is critical for their applications in optoelectronics, thermoelectrics, and photovoltaics. Here, an effective strategy is demonstrated to modulate the thermal transport property of hybrid perovskites by halide alloying. A highly tunable thermal conductivity of mixed-halide hybrid perovskites is achieved due to halide-alloying and structural distortion. The experimental measurements show that the room temperature thermal conductivity of MAPb(Br x I 1- x ) 3 ( x = 0─1) can be largely modulated from 0.27 ± 0.07 W m −1 K −1 ( x = 0.5) to 0.47 ± 0.09 W m −1 K −1 ( x = 1). Molecular dynamics simulations further demonstrate that the thermal conductivity reduction of hybrid halide perovskites results from the suppression of the mean free paths of the low-frequency acoustic and optical phonons. It is found that halide alloying and the induced structural distortion can largely increase the scatterings of optical and acoustic phonons, respectively. The confined diffusion of MA + cations in the octahedra cage is found to act as an additional thermal transport channel in hybrid perovskites and can contribute around 10–20% of the total thermal conductivity. The findings provide a strategy for tailoring the thermal transport in hybrid halide perovskites, which may largely benefit their related applications.
研究领域:
材料科学
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热传输工程
·
计算物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Huiwang Lian,Rongyi Kuang,Yunfei Zhu,Meng Gao,Simin Gu,Yang Li,Jing Wang
The state-of-the-art mixed-halide perovskite (MHP) quantum dots (QDs) open up promising applications in photovoltaic and optoelectronic communities, yet are limited by huge halide segregation. In contrast to the previous A-site alloy method, customizing other octahedral units for replacing the fundamental optoelectronic unit of [PbX 6 ] 4− (X = Cl, Br, or I), the so-called B-site alloying strategy, is expected to inhibit halide segregation fully. Here, a halide octahedron alloying reconstruction engineering is reported to fabricate MHP QDs with near-zero halide segregation due to their strongly confined excitons. This unprecedented regime is obtained at a water–oil interfacial reaction system using amino-silane ion exchange accelerator and transition metal hydroxy-halides salts, introducing abundant [MX 6 ] 4− (M = Zn, Ni, Co, Mn, and Cu) octahedron block and finally fabricating transition metal-alloyed MAPbX 3 QDs. Photo-induced excitons in strongly dielectric-confined Zn-alloyed perovskite QDs are hardly thermally dissociated and transferred, as featured by ultra-high exciton binding energy (E b ), fast fluorescence lifetimes (τ avg ), and near 100% photoluminescence quantum yield (PLQY). The fabricated mixed-halide MAPb 1-x Zn x X 3 QDs with reduced Pb content over 40% exhibit near-zero halide segregation, marking the emergence of a practical solution to the detrimental segregation problem, which paves the wave for emerging solar cells and lighting display applications.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 14
·2213964
·
IF 19
Qin Chen,Haidong Jiang,Yipeng Fan,Zhou Li,Huang Ye,Yunpeng Yao,Shuang Chen,Chengmin Ji,Shuhua Zhang,Junhua Luo
Hybrid organic–inorganic perovskite (HOIP) ferroelectrics with high Curie temperature ( T c ), typified by the lead halide hybrid perovskite ferroelectrics, are developing rapidly owing to their maneuverable ferroelectricity at high temperatures. However, acquiring high- T c lead-free HOIP ferroelectrics via rational strategy still needs development. In this study, a brand-new program by modulating the steric confinement in a cuplike cavity to design high- T c bismuth-halide ferroelectrics [H 2 mdap]BiX 5 (H 2 mdap = N -Methyl-1,3-Propanediamine, X = Cl ( 1 ), Br ( 2 ), I( 3 )) is proposed. Emphatically, the T c enhanced dramatically from 264 K of 3 to 318 K of 2 and 377 K of 1 , induced by the substitution of Br and Cl to I, accompanied with an interesting transition from second-order phase transition (for 3 ) to the first-order one (for 1 and 2 ). The extent of T c increase is up to 113 K, which far outweighs that of reported Pb-halide hybrid ferroelectrics. Structural and computational analyses elucidate that this unprecedented improvement of T c is due to the higher phase transition energy barriers induced by modulating the steric confinement of cuplike cavity via halogen substitution. These results will provide new inspiration for designing high- T c lead-free HOIP ferroelectrics.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Linyuan Lian,Peng Zhang,Xiuwen Zhang,Qi Ye,Wei Qi,Long Zhao,Jianbo Gao,Daoli Zhang,Jianbing Zhang
Zero-dimensional (0D) organic metal halides have attracted significant attention because of their exceptional structure tunability and excellent optical characteristics. However, controllable synthesis of a desirable configuration of metal halide species in a rational way remains a formidable challenge, and how the unique crystal structures affect the photophysical properties are not yet well understood. Here, a reasonable metal halide structural modulation strategy is proposed to realize near-unity photoluminescence quantum efficiency (PLQE) in 0D organic antimony halides. By carefully controlling the reaction conditions, both 0D (C12H28N)2SbCl5 and (C12H28N)SbCl4 with different metal halide configurations can be prepared. (C12H28N)2SbCl5 with pyramid-shaped [SbCl5]2– species exhibits yellow emission with a near-unity PLQE of 96.8%, while (C12H28N)SbCl4 with seesaw-shaped [SbCl4]− species is not emissive at room temperature. Theoretical calculations indicate that the different photophysical properties of these two crystals can be attributed to the different symmetries of their crystal structures. (C12H28N)2SbCl5 adopts a triclinic structure with P-1 symmetry, while (C12H28N)SbCl4 possesses a monoclinic structure with P21/c symmetry, which has an inversion center, and thus the optical transitions between their band-edge states give a minimal dipole intensity because of their similar parity character. In addition, we also successfully synthesized (C12H28N)2SbCl5 nanocrystals for the first time, which are particularly appealing for their solution processibility and excellent optical properties. Furthermore, (C12H28N)2SbCl5 nanocrystals flexible composite film shows bright yellow emission under β-ray excitation, suggesting a strong potential of (C12H28N)2SbCl5 for β-ray detection.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）