CHEMISTRY OF MATERIALS
·
2021
·
IF 9.811
Daofu Wu,Xusheng Zhao,Yanyi Huang,Junan Lai,Haiyun Li,Jiayu Yang,Changqing Tian,Peng He,Qiang Huang,Xiaosheng Tang
Huge potentiality of lead halide perovskite nanocrystals (NCs) can be found in optoelectronic and photocatalytic fields. However, the main bottlenecks in photocatalysis are their toxicity and instability. To shake off these issues, lead-free Cs2AgBiX6 (X = Cl, Cl0.5Br0.5, Br, Br0.5I0.5, I) double perovskite NCs were synthesized by a simple antisolvent recrystallization approach. Moreover, the as-prepared Cs2AgBiX6 materials were systematically studied for photocatalytic CO2 reduction, which costed a total electron consumption of 37.8 μmol g–1 under visible light irradiation (λ ≥ 420 nm, 300 W Xe lamp) within 3 h for Cs2AgBiI6. Our study here provides novel ideas of lead-free perovskites for photocatalytic reduction of CO2.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Sheng-Nan Yan,Xiao-Xue Wang,Chun-Li Hu,Bing-Xuan Li,Fang Kong,Jiang-Gao Mao
A new phase-matchable nonlinear-optical material, Na3Ti3O3(SeO3)4F, has been achieved by a facile hydrothermal reaction. The anionic skeleton displays a honeycombed 3D structure with Ti6Se6 12-member polyhedral ring tunnels along the c axis. Na3Ti3O3(SeO3)4F presents a strong second-harmonic-generation (SHG) response of about 6 × KDP, which is twice that of its isostructural Ag compound. Interestingly, the band gap of Na3Ti3O3(SeO3)4F is also broader than that of the isomorph. Also, the powder laser-induced damage threshold of Na3Ti3O3(SeO3)4F is even 5.5 times larger than that of Ag3Ti3O3(SeO3)4F. Theoretical calculations revealed that the fully filled Ag 4d and empty Ag 5s states have made the difference in the band gap and SHG response of the two isostructural compounds. Our work has provided a practical way of improving the SHG efficiency and band gap simultaneously, which is usually considered to be a pair of negatively correlated parameters.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2017
·Vol. 46
·期 8
·2643-2652
·
IF 4.029
Aimin Wu,Jing Li,Baodan Liu,Wenjin Yang,Yanan Jiang,Lusheng Liu,Xinglai Zhang,Changmin Xiong,Xin Jiang
(GaN)1−x(ZnO)x solid solution has attracted extensive attention due to its feasible band-gap tunability and excellent photocatalytic performance in overall water splitting. However, its potential application in the photodegradation of organic pollutants and environmental processing has rarely been reported. In this study, we developed a rapid synthesis process to fabricate porous (GaN)1−x(ZnO)x solid solution with a tunable band gap in the range of 2.38–2.76 eV for phenol photodegradation. Under visible-light irradiation, (GaN)0.75(ZnO)0.25 solid solution achieved the highest photocatalytic performance compared to other (GaN)1−x(ZnO)x solid solutions with x = 0.45, 0.65 and 0.85 due to its higher redox capability and lower lattice deformation. Slight Ag decoration with a content of 1 wt% on the surface of the (GaN)0.75(ZnO)0.25 solid solution leads to a significant enhancement in phenol degradation, with a reaction rate eight times faster than that of pristine (GaN)0.75(ZnO)0.25. Interestingly, phenol in aqueous solution (10 mg L−1) can also be completely degraded within 60 min, even under the direct exposure of sunlight irradiation. The photocurrent response indicates that the enhanced photocatalytic activity of (GaN)0.75(ZnO)0.25/Ag is directly induced by the improved transfer efficiency of the photogenerated electrons at the interface. The excellent phenol degradation performance of (GaN)1−x(ZnO)x/Ag further broadens their promising photocatalytic utilization in environmental processing, besides in overall water splitting for hydrogen production.
研究领域:
材料科学
·
环境科学
·
光催化
·
半导体物理
·
能源化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2013
·Vol. 2
·期 3
·653-662
·
IF 0
Zhi Zeng,Ying Li,Jufu Deng,Qin Huang,Qiang Peng
Using tetrathienoacene (TT) and diketopyrrolopyrrole (DPP) units as donor and acceptor blocks, three new low band gap (LBG) conjugated copolymers (PTTDPO, PTTDPS and PTTDPSe) with different heterocycle bridges (furan, thiophene and selenophene) were designed and synthesized by Stille coupling polymerization reactions. Their structures were verified by 1HNMR spectroscopy and elemental analysis. All these copolymers exhibit broad absorption bands with small band gaps. UV-vis absorption spectra and cyclic voltammetry (CV) measurements indicated that the selenophene inclusion resulted in a reduction in the band gap, which could be attributed to a reduction of oxidation potentials and an increase of the electron affinities of the related copolymer. The density functional theory (DFT) calculations showed that PTTDPSe with selenophene bridges favoured a much more planar conformation than PTTDPO and PTTDPS, which afforded a higher hole mobility of 7.9 × 10−4 cm2 V−1 s−1. Photovoltaic properties of the copolymers blended with [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) as an electron acceptor were investigated. The polymer solar cell (PSC) based on the structure of ITO/PEDOT:PSS/PTTDPSe:PC71BM (1 : 1.5, w/w)/Ca/Al exhibited a high power conversion efficiency (PCE) of 5.68% with an improved short circuit current density (Jsc) of 15.62 mA cm−2. The primary results show that changing heterocycle bridges with different electron-donating ability can easily and finely tune the optical absorptions, band gaps and energy levels of DPP-containing copolymers. The results also demonstrate that the TT unit is a new and promising electron-donating donor block for constructing highly efficient LBG photovoltaic materials.
研究领域:
高分子化学
·
材料科学
·
光伏器件
·
有机电子学
·
能源材料
✓ 已验证
DOI
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Yan Chen,Chunli Hu,Zhi Fang,Yilin Li,Jianggao Mao
Birefringent materials capable of modulating the polarization of light have attracted intensive studies because of their wide utilization in optical communication and the laser industry. Herein, two new lead(II)-based cyanurates, namely, Pb(H2C3N3O3)X (X = OH, F), were synthesized by hydrothermal methods, and the first halogen-containing metal cyanurate Pb(H2C3N3O3)F was successfully obtained by the rational substitution of a homovalent anion. Pb(H2C3N3O3)X (X = OH, F) belong to space group P1̅, and their structures display a neutral [Pb(H2C3N3O3)X] (X = OH, F) layer. The Pb2+ ions in Pb(H2C3N3O3)(OH) are interconnected by hydroxyl groups and oxygen atoms of cyanurate anions into a 1D [PbO(OH)]− chain, whereas the Pb2+ ions in Pb(H2C3N3O3)F are interconnected by F– anions and oxygen atoms of cyanurate anions into a 2D [PbOF]− layer. The π–π interactions between adjacent hydroisocyanurate rings and the hydrogen bonds between neighboring neutral layers provide additional stability to the structures. Luminescent studies show that Pb(H2C3N3O3)(OH) and Pb(H2C3N3O3)F emit yellow-green and blue light, respectively. Theoretical calculations unveiled their birefringences of 0.079 and 0.203@1064 nm and their band gaps of 3.96 and 4.96 eV, respectively, for OH– and F– containing materials. Obviously, the substitution of OH– by F– with the largest electronegativity can simultaneously improve both the birefringence and band gap.
研究领域:
材料科学
·
光学材料
·
无机化学
·
固态化学
✓ 已验证
DOI
高影响因子
ACTA PHYSICO-CHIMICA SINICA
·
2016
·Vol. 32
·期 4
·828-833
·
IF 0.844
HU Xue-Mei,GAO Xiang-Dong,LI Xiao-Min,GU Zheng-Ying,SHI Ying,WU Yong-Qing
Perovskite-structured SrSnO3 has attracted considerable attention in recent years because of its unusual dielectric and semiconducting properties. Certain dopants can be used to modify and improve the properties of these materials. Epitaxial SrSn1-x
Co
x
O3
(x = 0, 0.16, 0.33, 0.5) (SSCO) thin films were deposited on single crystal SrTiO3(001) substrates via the pulsed laser deposition method. The crystallinity, microstructure, optical, and electrical properties of the films were investigated. The results indicated that SrSn1-x
Co
x
O3
films were epitaxially grown on SrTiO3(001) substrate with both a perovskite structure and high crystallinity irrespective of the Co doping level. The films exhibited a smooth and dense morphology with a root-mean-square roughness of 0.44 nm and a film thickness of ~200 nm. As the‘x’
value increased from 0 to 0.5, the optical transmittance decreased from 90%to 25%, and the band gap dropped from 4.24 to 2.44 eV. Moreover, the doped film exhibited a high dielectric constant of 70.1 at 106 Hz, 57% higher than the control SrSnO3 film. The SSCO film displayed
surface resistivity of 172 Mω at room temperature and high stability at temperature up to 1000°C.
研究领域:
材料科学
·
凝聚态物理
·
薄膜技术
·
光电子学
✓ 已验证
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2014
·Vol. 20
·期 41
·13259-13271
·
IF 5.696
Xiaopeng Xu,Yulei Wu,Junfeng Fang,Zuojia Li,Zhenguo Wang,Ying Li,Qiang Peng
A new series of donor–acceptor co-polymers based on benzodithiophene and quinoxaline with various side chains have been developed for polymer solar cells. The effect of the degree of branching and dimensionality of the side chains were systematically investigated on the thermal stability, optical absorption, energy levels, molecular packing, and photovoltaic performance of the resulting co-polymers. The results indicated that the linear and 2D conjugated side chains improved the thermal stabilities and optical absorptions. The introduction of alkylthienyl side chains could efficiently lower the energy levels compared with the alkoxyl-substituted analogues, and the branched alkoxyl side chains could deepen the HOMO levels relative to the linear alkoxyl chains. The branched alkoxyl groups induced better lamellar-like ordering, but poorer face-to-face packing behavior. The 2D conjugated side chains had a negative influence on the crystalline properties of the co-polymers. The performance of the devices indicated that the branched alkoxyl side chains improved the V oc , but decreased the J sc and fill factor (FF). However, the 2D conjugated side chains would increase the V oc , J sc , and FF simultaneously. For the first time, our work provides insight into molecular design strategies through side-chain engineering to achieve efficient polymer solar cells by considering both the degree of branching and dimensionality. Graphical Bit on the side : By considering the degree of branching and dimensionality simultaneously, a systematic investigation of side-chain engineering was performed to explore the effect on the thermal stability, optical absorption, energy levels, molecular packing, and photovoltaic properties of the resulting co-polymers (see figure).
研究领域:
材料科学
·
高分子化学
·
有机电子学
·
光伏技术
·
太阳能
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 41
·15638-15646
·
IF 8.067
Xiang Li,Xinghuan Hu,Hua Liao,Shuai Yang,Xinyu Li,Qiulian Li,Xin Liu,Yonggang Zhao,Shurong Wang
In this study, a simple and reproducible two-step annealing process was demonstrated to prepare Cu2ZnSn(S,Se)4 (CZTSSe) thin film with band-gap grading by selenization followed by post-sulfo-selenization (PSS) treatment. The effects of PSS treatment on the composition and electrical properties of the CZTSSe thin film were investigated. The crystal structure, surface morphology, surface roughness and element composition of the CZTSSe thin film were characterized by GIXRD, SEM, AFM and EDS tests. The composition of elements at different depths of the thin film was also investigated. It was confirmed that CZTSSe thin film with high sulfur element content on the surface and low at the bottom were obtained after PSS treatment. The electrical performance of the CZTSSe solar cells was measured by Hall test, EQE and J–V. The results showed that the power conversion efficiency (PCE) of the CZTSSe thin film without PSS treatment was only 7.62%, while the PCE of the CZTSSe thin film after PSS treatment increased to 10.11%.
研究领域:
材料科学
·
光伏技术
·
半导体薄膜
✓ 已验证
DOI
高影响因子
FirePhysChem
·
2026
·
IF 5.1
Xin Ruan,Yousheng Qiu,Wenwen Deng,Ligang Zhang,Jiaoyang Liu,Zeyu Wang,Hongxia Zhang,Chongwei An,Baoyun Ye
During the storage, transportation and loading processes of composite solid propellants, micro-cracks and defects will be generated, which will shorten their service life. By developing composite solid propellants with self-repairing functions, it is expected to solve these problems. Therefore, this study proposes a novel energetic self-healing binder based on dynamic disulfide bond exchange reactions and hydrogen-bond reorganization. BAMO/THF is copolymerized with GAP matrix as the soft segment; isophorone diisocyanate (IPDI) and 2,2′-diaminodiphenyl disulfide (2-AFD) are selected as the hard segments to synthesize a series of self-repairing adhesives (PGPU). After 96 hours of high and low temperature impact, the mass change rate of PGPU samples is less than 0.01%, the tensile strength change rate is less than 6%, and the fracture elongation rate change rate is less than 4%. It has excellent mechanical stability under high and low temperature environmental impact. Among them, the toughness of PGPU-3 reaches 38.93 MJ·m -3 , and the self-repair efficiency reaches 84.47% after 16 hours of fracture at 75 °C. Based on this, self-repairing composite solid propellants are prepared, and the self-repairing efficiency of the tensile strength can reach 84.28%, and the burning rates at 1 MPa, 3 MPa, and 5 MPa pressures are 10.07 mm/s, 12.19 mm/s, and 13.82 mm/s, respectively, with excellent combustion performance. This study provides new theoretical basis and feasibility schemes for designing high-energy-density self-repairing adhesives.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2026
·
IF 3.8
Liang Yang,Jianwei Dao,Zihao Han,Zhihao Jiang,Yajie Deng,Taiping Han
Traditional white light-emitting diodes (LEDs) frequently exhibit cyan-gap deficiency, resulting in unbalanced emission spectrum that impedes the realization of full-spectrum lighting. Herein, a novel Ce 3+ -doped garnet phosphor CaY 2 HfAl 4 O 12 (CYHAO:Ce 3+ ) was successfully synthesized via a high-temperature solid-state reaction method. The crystal structure, luminescent properties, thermal stability, and WLED application performance of the phosphor were systematically investigated. X-ray diffraction (XRD) and Rietveld refinement results confirm that CYHAO:Ce 3+ crystallizes in a cubic garnet structure with space group Ia-3d. Under 446 nm blue light excitation, CYHAO:Ce 3+ exhibits a broad cyan emission band centered at ∼505 nm, which perfectly fills the cyan-gap of traditional WLEDs. The optimal Ce 3+ doping concentration is determined to be 0.02 mol. Concentration quenching mainly resulted from radiation reabsorption and electric dipole-electric dipole interactions. This phosphor exhibited strong thermal stability, retaining ∼73% of initial emission intensity at 423 K with an activation energy of 0.31eV. A WLED device fabricated by combining it with commercial CaAlSiN 3 :Eu 2+ phosphors and a 450 nm blue chip emitted warm white light with an excellent color rendering index (Ra = 92.8, R9 = 93.9, R15 = 91.7) and a correlated color temperature of 3507 K. These results demonstrate that CYHAO:Ce 3+ is a promising cyan phosphor for high-quality full-spectrum WLEDs with excellent color rendering performance.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Hong Li,Junfeng Zheng,Binghan Liu,Mengying Suo,Mochou Fu,Yaowei Pang,Xiangting Zhang,Yanpeng Dai
The pursuit of full-spectrum white light-emitting diodes (WLEDs) with high color rendering is often hampered by the “cyan gap”, a spectral deficiency that compromises light quality. Herein, we narrow this gap by developing a novel yellow-green-emitting Y 2- x CaScAl 3 SiO 12 :0.06Ce 3+ (YCSASO:0.06Ce 3+ ) garnet phosphor. A series of YCSASO: x Ce 3+ ( x = 0.01-0.16) garnet phosphors is synthesized and systematically studied. Structural analysis confirms that all phosphors crystallize in a pure cubic garnet structure, with Ce 3+ ions occupying the dodecahedral sites of Y 3+ and leading to a slight lattice expansion. Upon 450 nm excitation, the YCSASO: x Ce 3+ phosphors exhibit a wide asymmetric band characteristic of the Ce 3+ emission (5d 1 →4f). The tunability of the emission color across the green-to-yellow region is achieved through variation of Ce 3+ concentration, because of enhanced crystal field splitting and resonant energy transfer. YCSASO:0.06Ce 3+ as the optimal composition effectively narrows the cyan gap, exhibiting a broad emission band centered at 549 nm with a full width at half maximum (FWHM) of 124 nm, an internal quantum efficiency (IQE) of 56.3%, and an external quantum efficiency (EQE) of 28.4%. First-principles calculations indicate that incorporating Ce 3+ 5d states narrows the host bandgap, facilitating efficient electron transitions. This phosphor achieves stable thermal performance by maintaining 59% of its initial intensity at 423 K and remarkable color stability with a chromaticity shift as low as Δ E = 5.1 × 10 −3 . A prototype WLED based on this yellow-green phosphor, a 455 nm blue LED chip, and a red-emitting CaAlSiN 3 :Eu 2+ phosphor maintains excellent stability for at least 12 h and generates high-quality warm white light, achieving a color rendering index (Ra = 92.2), a correlated color temperature (CCT = 3490 K), and a luminous efficacy of 52.6 lm/W. This work validates the strategic use of the yellow-green YCSASO:0.06Ce 3+ phosphor to narrow the cyan gap, paving the way for advanced full-spectrum lighting.
✓ 已验证
产品关联
DOI
高影响因子
Science China-Materials
·
2026
·
IF 7.7
Shi Yunfei,Wang Hongshan,Chu Yu,Su Xin,Li Zhenglong,Lu Juanjuan,Abudurusuli Ailijiang,Li Junjie,Pan Shilie
Nonlinear optical crystals are the critical optical devices of all-solid-state lasers. Here, we report the rational design and synthesis of a new diamond-like (DL) compound, AlGaS 3 , assembled from two strategically selected tetrahedral units: a wide HOMO-LUMO gap [AlS 4 ] and an NLO-active [GaS 4 ]. Notably, AlGaS 3 crystallises in the noncentrosymmetric monoclinic space group Cc . It features a favourable tetrahedral stacking arrangement similar to that of β -ZnS. This compound exhibits a wide band gap (3.38 eV), a high laser-induced damage threshold (LIDT) of 6.0 × AgGaS 2 , and a phase-matchable second-harmonic generation (SHG) response of 0.5 × AgGaS 2 , achieving a desirable property balance for IR NLO candidates. Theoretical calculations show that both [AlS 4 ] and [GaS 4 ] contribute to the band gap, with [GaS 4 ] underpinning the NLO activity. Additionally, AlGaS 3 exhibits congruent melting behaviour, enabling the growth of high-quality bulk crystals via the Bridgman-Stockbarger method, a crucial step for practical applications of new materials. The results confirm AlGaS 3 as a promising IR NLO material with high tolerance to laser radiation and provide new insights into developing advanced photoelectric materials with tunable properties via partial tetrahedral substitution in the DL framework.
✓ 已验证
DOI
高影响因子
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