Materials Today Communications
·
2023
·
IF 3.8
Fan Xu,Xiaoyu Yang,Qixuan Zhong,Lei Zhao,Yongqiang Ji
All-inorganic cesium-based perovskite nanocrystals (PeNCs) attract much attentions in displays due to their facile synthesis protocol and superior luminous performance, while material instability hinders their practical applications. Herein, by inducing a multi-functional dopant , i.e., SrBr 2 , into the perovskite precursor solution, the as-formed SrBr 2 -doped CsPbBr 3 NCs possess purer phases, suppressed defects and hydrophobic surfaces , which leads to a high photoluminescence quantum yield of ∼90 %, as well as much improved moisture stability. Benefiting from dopant passivation and improved luminescence properties, the doped CsPbBr 3 light emitting diodes show five times and two times of current efficiency and external quantum efficiency improvements, respectively, in comparison to their undoped counterparts.
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高影响因子
AICHE JOURNAL
·
2023
·Vol. 69
·期 12
·e18240
·
IF 3.7
Yaqun Han,Jingyuan Hu,Xingzuo Li,Yue Wu,Jie Ren,Shufen Zhang,Suli Wu
The problems of difficult dyeing, poor dyeing fastness, and dyeing pollution of aramid are always great obstacles in the practical application. In theory, constructing particular nanostructures instead of dyes on aramids to achieve bright structural colors will be an effective strategy. However, it is still challenging to construct particular nanostructures on aramid fabric surfaces because of their roughness. Here, beautiful and noniridescent structural colored aramids with excellent light fastness were achieved by spraying a thin layer of randomly distributed nanospheres on the surface of adhesive-modified aramids. Moreover, different bright structural colors and colorful patterns were obtained by simply controlling the size or refractive index of the spheres. Importantly, the light fastness of the structural colored aramid can reach levels 6–7 or higher. The simple and eco-friendly coloring technology can be compatible with industrial equipment to obtain stable multicolored aramid products, exhibiting great real potential applications.
研究领域:
材料科学
·
纺织工程
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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
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高影响因子
ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Yabing Sun,Haoju Li,Xin Zhou,Yonggang Min,Yannan Qian
It is well known that the balanced charge injection helps prepare high-performance red light-emitting diodes (LEDs) in the electroactive material CsPbBr x I 3- x quantum dots (QDs). Employing a hydrothermal method, we synthesized MoO 2 nanocrystals and doped them into Poly(3,4-ethylenedioxythiophene) /poly(styrenesulfonate) (PEDOT:PSS). The results show that the synthesized MoO 2 nanocrystals can modulate the work function of PEDOT:PSS and enhance the conductivity of the PEDOT:PSS films, which is attributed to disrupting the hydrogen bond between PEDOT and PSS, and inducing the transition of PEDOT from benzoid to quinoid structure. In the PEDOT:PSS- x MoO 2 film, the work function increases from 4.9 eV to 5.09 eV when the content of x is 15%, which reduces the energy barrier between the PEDOT:PSS- x MoO 2 and the hole transport layer: poly[N,N'-bis(4-butylphenyl)-N,N'-bis(phenyl)-benzi (poly-TPD), thus promoting the hole transport and improving the V on of the devices. Additionally, the device's external quantum efficiency (EQE) reaches a maximum value of 7.53% at x = 15% enabling an improvement of 2.6 times over the base device (EQE=2.10%). This work proves that PEDOT:PSS- x MoO 2 as a hole transport layer is an effective material for preparing high-performance QD-LEDs.
研究领域:
材料科学
·
光电技术
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高影响因子
INORGANIC CHEMISTRY
·
2026
·
IF 4.6
Yongjing Deng,Xiaodong Zhao,Ning Ding,Yong Yang,Yongkang Zhu,Mengzhu Wang,Shujuan Liu,Yun Ma,Qiang Zhao
Zero-dimensional (0D) organic–inorganic hybrid metal halides are promising phosphors, yet their wide bandgaps typically require ultraviolet excitation, limiting compatibility with commercial blue light-emitting diode (LED) chips. Here, we present an aggregate-engineering strategy to unlock blue-light excitability in 0D copper(I) iodides by modulating the aggregation architecture of Cu–I motifs within a fixed phosphonium-cation framework. Two homologous compounds, (C26H24OP)2Cu2I4 and (C26H24OP)2Cu4I6, were selectively synthesized through simple stoichiometric regulation. Increasing the nuclearity from a dimer to a tetramer strengthens cuprophilic interactions, narrows the optical bandgap from 2.98 to 2.61 eV, and markedly broadens the excitation window into the blue region. Density functional theory calculations further support the aggregation-induced bandgap narrowing by revealing increased inorganic contributions at the band edges in the tetramer. Notably, the tetramer achieves a high thermal stability and moisture tolerance. Finally, a single-component white LED (WLED) based on the tetramer and a 450 nm chip delivers high-quality white light, and a proof of concept for visible light communication enables high-fidelity audio transmission. This work establishes aggregate engineering as an effective design principle for bridging 0D hybrid halides with practical blue-chip pumping and integrated lighting communication platforms.
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PubMed
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 35
·10802-10809
·
IF 6.641
Peng Du,Weiguang Ran,Weiping Li,Laihui Luo,Xiaoyong Huang
A series of NaTbF4 and Eu3+-activated NaTbF4 nanorods with high luminescent efficiency were designed by using an ingenious reaction technique at room temperature. The effect of the synthesis time on the morphology evolution of NaTbF4 nanorods was investigated. Moreover, the influences of the Eu3+ doping concentration on the crystal structure, morphology, electronic structure and photoluminescence properties of NaTbF4 nanorods were systematically studied. Near-ultraviolet (NUV) light was the proper excitation light source for the final products and the optimum Eu3+ doping concentration was 30 mol%. The critical distance of Eu3+ ions in the NaTbF4 host lattices was 11.42 Å and the concentration quenching mechanism was dominated by electric dipole–dipole interactions. The local symmetry properties of Eu3+ ions in the NaTbF4 host were explored by analyzing the optical transition parameters based on the Judd–Ofelt theory. The resultant nanorods not only exhibited splendid thermal stability but also had a high internal quantum efficiency of 50.2%. Additionally, the fabricated light-emitting diode (LED) device can emit glaring white light emission with admirable color properties (i.e., good color coordinates, high color rendering and low correlated color temperature) which slightly changed at high injection current. These achievements suggested that the Eu3+-activated NaTbF4 nanorods were promising red-emitting candidates for high-powered NUV-pumped white-LEDs.
研究领域:
材料科学
·
光学
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高影响因子
Materials
·
2022
·Vol. 15
·期 17
·5906
·
IF 3.748
Jingfei Luan,Wenlu Liu,Ye Yao,Bingbing Ma,Bowen Niu,Guangmin Yang,Zhijie Wei
A new photocatalyst, Er2FeSbO7, was prepared by solid phase sintering using the high-temperature synthesis method for the first time in this paper. Er2FeSbO7/BiTiSbO6heterojunction (EBH) catalyst was prepared by the solvent thermal method for the first time. Er2FeSbO7compound crystallized in the pyrochlore-type architecture and cubelike crystal system; the interspace group of Er2FeSbO7wasFd3mand the crystal cellular parameter a of Er2FeSbO7was 10.179902 Å. The band gap (BDG) width of Er2FeSbO7was 1.88 eV. After visible light irradiation of 150 minutes (VLGI-150min) with EBH as a photocatalyst, the removal rate (RR) of enrofloxacin (ENR) concentration was 99.16%, and the total organic carbon (TOC) concentration RR was 94.96%. The power mechanics invariable k toward ENR consistency and visible light irradiation (VLGI) time with EBH as a photocatalyzer attained 0.02296 min−1. The power mechanics invariable k which was involved with TOC attained 0.01535 min−1. The experimental results showed that the photocatalytic degradation (PCD) of ENR within pharmaceutical waste water with EBH as a photocatalyzer under VLGI was in keeping with the single-order reactivity power mechanics. The RR of ENR with EBH as a photocatalyzer was 1.151 times, 1.269 times or 2.524 times that with Er2FeSbO7as a photocatalyst, BiTiSbO6as a photocatalyst, or N-doping TiO2(N-TO) as a photocatalyst after VLGI-150min. The photocatalytic activity, which ranged from high to low among above four photocatalysts, was as follows: EBHP > Er2FeSbO7> BiTiSbO6> N-TO. After VLGI-150min toward three periods of the project with EBH as a photocatalyst, the RR of ENR attained 98.00%, 96.76% and 95.60%. The results showed that the stability of EBH was very high. With appending trapping agent, it could be proved that the oxidative capability for degrading ENR, which ranged from strong to weak among three oxidic radicals, was as follows: superoxide anion > hydroxyl radicals (HRS) > holes. This work provides a scientific basis for the research and oriented leader development of efficient heterojunction catalysts.Keywords:Er2FeSbO7;Er2FeSbO7/BiTiSbO6heterojunction photocatalyst;enrofloxacin;pharmaceutical wastewater;visible light irradiation;photocatalytic activity
研究领域:
环境科学
·
材料科学
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PubMed
高影响因子
CARBON
·
2023
·
IF 10.9
Xiao Gong,Qingqing Xu,Xiaona Chen,Fanchao Meng,Hangxiang Wang
In this age of technology, people are inevitably surrounded by electronic devices and light-emitting devices, but the radiation generated by these devices is very harmful to humans. Therefore, it is crucial to develop a stable absorbing material with efficient absorption capacity for UV and high-energy blue light (HEBL). In this paper, we report that carbon nanodots (CDs) with strong absorption peaks in the UV and HEBL can be rapidly synthesized in large scale by simply heating urea and citric acid at high temperature under atmospheric pressure without using any solvents. Interestingly, the large-scale prepared CDs possess green fluorescence emission upon excitation in both the UV and HEBL regions, exhibiting good photoconversion ability. Furthermore, ultrahigh efficient UV and HEBL shielding films can be prepared by embedding the CDs in a carboxymethyl cellulose matrix. By characterizing their transmission and absorption spectra , it can be found that the cellulose films containing 0.2 wt% CDs achieve almost complete shielding of UV-A, UV-B, and HEBL with a guaranteed visible light (550 nm) transmission rate of 80% or above. Finally, this cellulose film was further attached to a light-emitting diode (LED) chip to investigate its practical use in the field of UV and strong blue light shielding.
研究领域:
材料科学
·
光学工程
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Haidong Ju,Jiaqin He,Hongguang Guo,Yanmei Dao,Chengning Jiang,Xiujun Deng,Baoling Wang
Recently, low-cost, blue-light-excited, and cyan-emitting phosphors have become increasingly important for commercial white light-emitting diode (LED). In this study, a new garnet-type phosphor, Ca 2 LuAl 3 Si 2 O 12 : Ce 3+ (CLASO: Ce 3+ ) with a small Stokes shift and a broad cyan-emitting band, was successfully developed through an ion-replacement technique. Rietveld refinement results confirmed its garnet structure with small crystallographic parameters of a = 11.8850(4) Å and V = 1678.81(18) Å 3 . The CLASO: Ce 3+ phosphor featured two wide absorption bands in the 280–500 nm range, with a maximal peak at 445 nm, matching well with the emission wavelengths of commercial blue LED chips. Upon 445 nm excitation, the optimal CLASO: 0.04Ce 3+ phosphor exhibited a broad cyan-emitting band peaking at 504 nm, with a full width at half maximum of 103 nm. This made it an ideal candidate for filling the cyan gap of blue-pumped white LEDs, thereby enhancing the color rendering index. The excitation and emission spectra of CLASO: Ce 3+ phosphor revealed an ultra-small Stokes shift of 2631 cm −1 , which was attributed to its exceptionally strong structural rigidity – an important factor for energy conversion and luminescent stability. Moreover, the internal quantum efficiency of CLASO: 0.06Ce 3+ was found to be 88 %. Finally, a phosphor converted LED device was assembled using a 445 nm blue LED chip and CLASO: 0.06Ce 3+ cyan phosphors. The device exhibited a high luminous efficacy of 119 lm/W and an excellent stability. The exploration of the relationship between the Stokes shift and photoluminescence properties provides a novel approach to improving phosphors for high performance white LED.
研究领域:
材料科学
·
光学工程
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高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Kané Rabé,Lifen Liu,Noor Ahmed Nahyoon
Visible-light-driven photocatalytic Fuel Cell (PFC) is of great interest in the environmental pollutant remediation with energy recovering. Herein, enhancement in photocatalytic degradation of Tetracycline Hydrochloride (TC) with electricity generation was achieved in a single reactor of PFC with paired stainless-steel mesh electrode loaded with anodic g-C 3 N 4 /Fe 0 (1%)/TiO 2 and cathodic WO 3 catalyst (at various pH, 0.05 M Na 2 SO 4 , 10 Ω external resistance) with visible light and without light. With light, TC molecules were successfully removed (97.3% in 90 min, at initial and optimal pH 5), while generating 0.98 V cell voltage and 24 W m −2 power density, simultaneous removal of COD (chemical oxygen demand) and TOC (total organic carbon) was 91.3% and 95%, respectively, suggesting superior mineralization that can be explained by the excitation of the anodic triple component g-C 3 N 4 /Fe 0 (1%)/TiO 2. In contrast, without light, the removal of COD, TOC and the cell voltage were much lower (48.8%, 65.3%, 0.78 V). In dark, the fuel cell is self-driven and self-biased, forming potential gradient and degrading pollutants. The effects of solution pH, initial TC concentration on degradation and power generation were evaluated. This PFC degrading TC can maintain high photocatalytic activity and high power output capacity after 5 cycles with light. Without light, the electricity generation capacity was 50–70% that in visible light PFC. These features reveal that fuel cell with g-C 3 N 4 /Fe 0 (1%)/TiO 2 photo anode and WO 3 photocathode has great application potential for removing refractory pollutants from wastewater.
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ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Hai-yan Wu,Ruo-tian Chen,Yao-wen Shao,Xiao-dong Qi,Jing-hui Yang,Yong Wang
Form-stable phase change materials (PCMs) are widely used for thermal management. However, the strong rigidity and the weak photoabsorption ability have hindered their practical applications. Herein, we report a flexible PCM based on paraffin wax (PW) and polydopamine-coated melamine foam (MF@PDA) for the seamlessly combined light-actuated shape memory and light-to-thermal energy storage capability. The MF@PDA foams with different PDA contents, which act as supporting scaffolds to adsorb PW, are successfully obtained by varying the immersion times and the dopamine concentrations. The low density and high porosity of MF@PDA foams allow for high weight fraction of PW to be incorporated, making the PCMs show high latent heat and encapsulation ability. Simultaneously, the elastic MF@PDA foams impart the PCMs with good shape memory property by triggering the phase transition of PW. More importantly, due to the efficient photothermal effect of PDA coating, the PCMs exhibit excellent light-actuated shape memory effect (shape recovery ratio ∼ 100%, shape recovery speed ∼ 100 s) and solar-to-thermal energy storage efficiency (80.8%). The light-actuated shape recovery rates and the solar-to-thermal transfer rates are increased with the augmented amount of PDA coating. Besides, the PCMs exhibit quite stable shape memory cyclic performance and thermal reliability. This study provides a new strategy to design flexible and light-responsive PCMs with the potential to be used in advanced solar energy storage systems.
研究领域:
材料科学
·
能源科学
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高影响因子
CRYSTENGCOMM
·
2024
·Vol. 26
·期 44
·6314-6321
·
IF 2.6
Zhen Liu,Danli Song,Wen-Bo Pei,Liquan Wu,Hong Xie,Gaigai Cai,Jiefei Yang,Bing Zheng,Wei-Wei Xiong
Metal–organic frameworks (MOFs), self-assembled by metal ions and organic ligands, have been utilized as active layers in resistive random-access memory (RRAM) devices due to their tunable composition and structure advantages, high porosity, and diverse interactions between guest molecules and host frameworks. As one kind of special MOF, MOF nanosheets not only inherit the benefits of MOFs but also present unique two-dimensional nanoscale thicknesses. Their special properties make them beneficial for fabricating MOF films. Thus, they could be promising materials for RRAM devices. Herein, we synthesized two porphyrin MOF nanosheets and then fabricated MOF films by spin-coating. After that, we used the films for resistive switching (RS) layers in memory devices. The as-fabricated RRAM devices exhibit write-once-read-many-times memory characteristics and good nonvolatile stability. Furthermore, due to the unique luminescence of the porphyrin linker, we investigated the light-induced resistive switching characteristics. The result shows that these porphyrin-based MOF nanosheet films exhibited ternary memory properties. This RS modulation is likely related to the photoinduced electrons and holes forming along channels consisting of porphyrin molecules. This MOF-based light-mediated memory device can be a candidate for achieving environment-responsive devices and has applications in information storage devices.
研究领域:
材料科学
·
电子工程
·
光学
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高影响因子
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