查找使用阿拉丁产品的科研文献

Structure and luminescence of Gd3Ga3MgSiO12:Cr3+ garnet phosphor with highly efficient broadband near-infrared emitting toward pc-LED application

Qinghong Meng,Yuning Zhang,Xiangming Li,Wanjun Yu,Zhijun Xu,Ji-Guang Li

Doping Gd 3 Ga 3 Al 2 O 12 :Cr 3+ with Mg 2+ /Si 4+ pair to develop Gd 3 Ga 3 – y Al 2 – 2 x Mg x Si x O 12 : y Cr 3+ ( x  = 0–1.0; y  = 0.005–0.05) new garnet solid solution was implemented for the regulation of structure and photoluminescence. Rietveld refinement, SEM/TEM, and UV-Vis-NIR/photoluminescence spectroscopy analysis clarified that Mg 2+ /Si 4+ incorporation increasing resulted in the enlargement of the unit cell, the expansion/larger distortion of [(Ga,Al,Mg,Cr)O 6 ] octahedron, the decrease of crystal field strength, red-shifting and broadening of emission band, and shortening decay times. The optimal Gd 3 Ga 2.97 MgSiO 12 :0.03Cr 3+ phosphor realized broadband NIR emission (centered at ∼760 nm, full-width at half-maximum ∼114 nm) under 450 nm light excitation and exhibited high quantum efficiency (IQE=71.0 %, EQE=29.4 %) and good thermal stability (78.5 %@423 K). The NIR pc-LED fabricated by combining this optimal phosphor with a 450 nm blue LED chip showed satisfactory output power (∼26.83 mW) and conversion efficiency (10.02 %) under a driving current of 100 mA, indicating that this phosphor has huge potential utilized in the construction of NIR pc-LED applied in night vision and noninvasive medical diagnosis.

Accelerated photocatalytic degradation of organic pollutant over metal-organic framework MIL-53(Fe) under visible LED light mediated by persulfate

Yaowen Gao,Simiao Li,Yixi Li,Linyu Yao,Hui Zhang

Photocatalysis based on metal-organic frameworks (MOFs) is being actively investigated as a potential technology in visible light harvesting and utilizing processes. Herein we report that MIL-53(Fe), an earth-abundant Fe-containing MOF material, shows photocatalytic activity for the degradation of Acid Orange 7 (AO7) from aqueous solution under visible LED light irradiation, yet the photocatalytic performance of bare MIL-53(Fe) was not satisfactory due to the fast recombination of photoinduced electron-hole pairs. This can be effectively overcome by adding the external electron acceptor (e.g., persulfate, PS) to the catalytic process. The accelerated photocatalytic degradation of AO7 is demonstrated by the result that the degradation efficiency of AO7 in the MIL-53(Fe)/PS/Vis process reached almost 100% within 90   min as compared to only 24% under the identical experimental conditions for the MIL-53(Fe)/Vis process. To investigate the mechanism of the MIL-53(Fe)/PS/Vis process, photoluminescence (PL) spectra, electrochemical measurements and electron paramagnetic resonance (EPR) analysis were performed. It was concluded that the efficient separation of photogenerated electrons and holes by the introduced PS and the subsequent formation of reactive radicals resulting from the activation of PS by photogenerated electrons accounted for the accelerated photocatalytic degradation of AO7 in the MIL-53(Fe)/PS/Vis process. Furthermore, the applicability of MIL-53(Fe) used in the persulfate-mediated photocatalytic process was systematically investigated in terms of the identification of reactive radicals, the reusability and stability of the photocatalyst, as well as the effect of operating parameters. The findings of this work highlighted the great potential of MOFs as photocatalysts and elucidated a new opportunity for persulfate remediation of contaminated water.

Highly Flexible, SnO2/BiOBr Core-Shell Heterostructured Lignin-Based Carbon Nanofibrous Membrane Driven by LED Light for Pollutant Degradation

Bohan Liu,Jiayue Chen,Zhou Zhou,Wanli Cheng,Qinglin Wu,Yiying Yue

A highly flexible lignin-based carbon nanofibrous membrane functionalized with SnO 2 /BiOBr core-shell heterostructure (CNFs@SnO 2 /BiOBr) was fabricated via coaxial electrospinning and solvothermal synthesis. By positioning the SnO 2 precursor in the shell layer during electrospinning, rapid and stable stabilization of the lignin nanofiber at a rate of 1°C/min was achieved, significantly reducing the high-energy consumption constraints of traditional preparation processes. Experimental results demonstrated that the CNFs not only enhance light absorption capacity and promote electron transfer but also effectively suppress the recombination of electron-hole pairs at the SnO 2 /BiOBr heterojunction, thereby improving charge separation efficiency. Under LED light irradiation, the CNFs@SnO 2 /BiOBr membrane exhibited a degradation efficiency of 87.3% for Rhodamine B within 100 min with optimal performance at natural pH (6.2), increasing to 93.0% at pH 3.5. Additionally, the composite membrane maintained a stable efficiency of 84.5% after five cycles at pH 6.2, owing to its outstanding photocatalytic performance and self-supporting structure (tensile strength of 0.601 MPa and elongation at break of 6.10%). This research offers a sustainable approach to designing flexible photocatalytic membranes for wastewater treatment, emphasizing environmental and green significance while enhancing biomass resource efficiency. By improving heterojunction catalytic efficiency and addressing the challenge of recovering traditional powders, it demonstrates promising applications in advancing sustainable wastewater treatment solutions.

A facile approach preparing PMMA nanospheres through in-situ surfactant miniemulsion photopolymerization under green LED irradiation

Siyuan Yu,Tianyong Zhang,Jinfeng Xing

Herein, a facile method combining in-situ generation of potassium oleate (KOA) and miniemulsion photopolymerization under green LED irradiation was proposed to prepare poly(methylmethacrylate) (PMMA) nanospheres . A miniemulsion containing methyl methacrylate (MMA) was prepared in situ, in which KOA as a surfactant was synthesized by the neutralization reaction of oleic acid (OA) and potassium hydroxide (KOH), and then miniemulsion photopolymerization occurred to obtain PMMA nanospheres under green LED irradiation. Emulsion stability test proved that the in-situ surfactant miniemulsion has higher stability than the preformed surfactant miniemulsion. The effect of surfactant amount and exposure time on photopolymerization was investigated. Furthermore, hexadecane (HD) and polyvinylpyrrolidone (PVP) were introduced into the polymerization system to avoid the adverse effect of Ostwald ripening and particle agglomeration respectively, and PMMA nanospheres with uniform sizes of ∼100 nm were finally prepared.

Microfluidic-Based Patterning of High-Resolution, Uniform Luminescent, and Low Optical Crosstalk Quantum Dot Arrays for Full-Color Micro-LED Displays

Zijun Yan,Yuhui Wang,Shibiao Liu,Wenan Guo,Guolong Chen,Xiaotong Fan,Yue Lin,Shuli Wang,Hao-Chung Kuo,Zhong Chen,Tingzhu Wu

Quantum dot (QD) color conversion layers (CCLs) present an economical and reliable approach to achieve full-color micro-LED displays. Microfluidic technology demonstrates significant advantages for patterning and integrating multicolor QDs, including high precision, rapid processing, low material consumption, and low fabrication costs. However, preparing high-resolution CCLs with low optical crosstalk remains challenging due to limitations in microfluidic chip design induced by swelling of polydimethylsiloxane (PDMS) microchannels in nonpolar solvents utilized for QD dispersion. In this study, we developed a QD solution with a polymer additive that effectively suppresses PDMS swelling, making injection of QD solution into small-sized PDMS microchannels on chromium-patterned microhole glass substrates possible. The resulting QD CCLs exhibit high luminescence uniformity and a high resolution of 1285 ppi, with a subpixel dimension of 5 μm × 5 μm, which is the smallest dimension reported for CCLs fabricated by microfluidic technology. Furthermore, our innovative integration of chromium-patterned microhole glass substrates within a microfluidic device provides unprecedented optical isolation, effectively eliminating intersubpixel crosstalk in CCLs. By integrating optimized red and green QD CCLs with a blue GaN micro-LED array, we successfully fabricated a full-color micro-LED prototype with a resolution of 600 ppi and a wide color gamut of 115% NTSC. Owing to their high resolution, uniform luminescence, and low optical crosstalk, the proposed microfluidic technology holds significant promise for advancing next-generation full-color micro-LED displays.

A 700 nm LED Light Activated Ru(II) Complex Destroys Tumor Cytoskeleton via Photosensitization and Photocatalysis

Anyi Dao,Shiyan Chen,Li Pan,Qingyan Ren,Xun Wang,Haorui Wu,Qiufang Gong,Zeduan Chen,Shaomin Ji,Jiaxi Ru,HaoTu Zhu,Chao Liang,Pingyu Zhang,Haiping Xia,Huaiyi Huang

Photoactivable chemotherapy (PACT) using metallic complexes provides spatiotemporal selectivity over drug activation for targeted anticancer therapy. However, the poor absorption in near-infrared (NIR) light region of most metallic complexes renders tissue penetration challenging. Herein, an NIR light triggered dinuclear photoactivable Ru(II) complex ( Ru2 ) is presented and the antitumor mechanism is comprehensively investigated. The introduction of a donor–acceptor–donor (D–A–D) linker greatly enhances the intramolecular charge transition, resulting in a high molar extinction coefficient in the NIR region with an extended triplet excited state lifetime. Most importantly, when activated by 700 nm NIR light, Ru2 exhibits unique slow photodissociation kinetics that facilitates synergistic photosensitization and photocatalytic activity to destroy diverse intracellular biomolecules. In vitro and in vivo experiments show that when activated by 700 nm NIR light, Ru2 exhibits nanomolar photocytotoxicity toward 4T1 cancer cells via the induction of calcium overload and endoplasmic reticulum (ER) stress. These findings provide a robust foundation for the development of NIR-activated Ru(II) PACT complexes for phototherapeutic application.

Ultrastable and highly efficient green-emitting perovskite quantum dot composites for Mini-LED displays or backlights

Tongtong Xuan,Shaoqiang Guo,Wenhao Bai,Tianliang Zhou,Le Wang,Rong-Jun Xie

Although tremendous efforts have been made to enhance the stability of lead halide perovskite quantum dots (PeQDs), they cannot meet the long-term requirements of photoelectric devices due to their poor reliability when attacked by multiple factors. Herein, we report ultrastable CsPbBr 3 :Sr/PbBr(OH)/molecular sieve composites with a high photoluminescence quantum yield of 75% and high overall stability when exposed to water, blue light and heat, owing to (i) the increased formation energy of CsPbBr 3 PeQDs by Sr doping and (ii) good encapsulation by PbBr(OH) and molecular sieves. These composites maintain 54% of their initial intensity after being aged at 85 °C and 150 mW cm −2 for 720 min, which is superior to commercial green CdSe-based QDs. These promising composites are then used to produce Mini-LED backlights with a high luminous efficacy of 86 lm/W and a color area of ~124% of the National Television Standards Committee or 93% of the Rec. 2020 standards by combining them with red CdSe/CdS/ZnS QDs and a blue Mini-LED chip. We believe that highly reliable PeQDs can be achieved by building well-designed composite structures, thus enabling them to be practically applied in emerging lighting and displays.

Visible-LED-light-driven photocatalytic activation of peroxydisulfate by magnetic ZnFe2O4/Ag nanocomposite for efficient tetracycline degradation

Tingting Song,Xiaoyan Meng,Huayu Wang,Chao Zhang,Ming Ge

Heterogeneous photocatalysis/persulfate oxidation process has been regarded as a promising technology for antibiotic contaminants removal. Magnetic ZnFe 2 O 4 /Ag composite catalyst was synthesized to activate peroxydisulfate (PDS) toward tetracycline (TC) degradation under the visible-LED-light irradiation. The synergistic effect of ZnFe 2 O 4 and Ag endowed the optimized ZFO/Ag-15 with excellent photocatalytic performance for PDS activation and TC degradation, and 90.06 % of TC (20 mg/L) was efficiently degraded after 80 min of reaction. Ag can enhance the visible light absorption of ZnFe 2 O 4 and accelerate the separation of photo-induced electron/hole pairs, thereby promoting the generation of O 2 − and SO 4 − radicals. In addition, Ag can directly activate PDS to generate SO 4 − . Although the catalytic performance of magnetic ZFO/Ag-15 gradually decreased after each cycle due to the corrosion of Ag and the formation of inactive AgO, the catalytic activity of used catalyst was partially recovered by heat treatment. Quenching experiments and EPR tests indicated that the free radical (O 2 − , SO 4 − and OH) and non-free radical ( 1 O 2 , h + ) oxidation processes cooperated to degrade TC in Vis-ZFO/Ag-15/PDS system. The effect of operational factors (PDS concentration, temperature, solution pH, coexisting inorganic anions and humic acid) on TC degradation was investigated, and TC removal from the different water matrices (river water, tap water and secondary effluent) was also evaluated. The degradation products were detected using LC-MS and the possible TC degradation pathways were established.

Sustainable Decentralized Water Purification: Simultaneous Disinfection of Pathogenic Fungi and Degradation of Herbicide Via an Electrochemically Driven UV-LED/Cl2 Process

Qiqi Wan,Yiwei Han,Ruihua Cao,Shaolan Du,Jingyi Wang,Tinglin Huang,Gang Wen

The electrochemically driven UV light-emitting diode/chlorine (UV-LED/EC-Cl2) process represents an emerging advanced oxidation technology capable of simultaneously removing microorganisms and micropollutants, making it particularly suited for decentralized water treatment in rural areas (utilized naturally occurring Cl– in water). This research systematically investigated the removal efficiency and underlying mechanisms of the UV-LED/EC-Cl2 process for the selected microorganisms (Aspergillus niger spores) and herbicides (atrazine (ATZ) and 2,4-dichlorophenoxyacetic acid (2,4-D)). The results demonstrated a significant synergistic effect in fungal spore inactivation, primarily attributed to the generation of reactive radical species, which induced severe membrane disruption and elevated intracellular reactive oxygen species levels. Furthermore, the UV-LED/EC-Cl2 process exhibited exceptional herbicide removal efficiency, achieving over 90% degradation within 37 min. The coexistence of A. niger spores reduced the herbicide degradation efficiency by approximately 10%, with the degradation products of ATZ exhibiting increased molecular weight and toxicity. Even in actual groundwater, the UV-LED/EC-Cl2 process maintained a high removal efficiency. Additionally, the electrical energy per log removal of herbicide ranged from 18.3 to 32.5 kWh/m3-log, lower than that of the standalone processes. These findings underscore the potential of the UV-LED/EC-Cl2 process as an effective and energy-efficient solution for simultaneous microorganisms and micropollutant removal in decentralized water treatment.

Ligand-Free CsPbBr3 Perovskite Quantum Dots in Silica-Aerogel Composites with Enhanced Stability for w-LED and Display by Substituting Pb2+ with Pr3+ or Gd3+ Ions

Chong Zhao,Yingkui Li,Wanggui Ye,Xiaofei Shen,Zicheng Wen,Xuanyi Yuan,Yongge Cao,Chaoyang Ma

Colloidal all-inorganic lead halide perovskite nanocrystals (LHP NCs) feature with tunable high-efficiency photoluminescence from blue to red for optoelectronic applications but suffer from instability under water moisture, UV light illumination, high-temperature shock, as well as oxygen erosion. Previous work to improve LHP NCs stability was mainly focused on either glass bulk sealed LHP quantum dots (QDs) with low quantum efficiency, or mesoporous silica matrixes confined LHP QDs with organic ligands still existing. Here, a facile, noncolloidal, ligand-free LHP QDs growth with physical confinement is proposed by integrating the growth of perovskite QDs with the fabrication process of hydrophobic silica-aerogel powders (SAPs). As a result, the as-synthesized mono- and mixed-cesium-lead-halide QDs @ SAPs composites show tunable photoluminescence from purple to deep red. Besides, the Pr 3+ ions doped CsPbBr 3 QDs @ SAPs composites exhibit moderate quantum efficiency, excellent stability under UV illumination, water moisture as well as temperature variation. Furthermore, performances of white LED device encapsulated Pr 3+ doped composite with blue GaN chip and commercial red (Sr, Ca)AlSiN 3 :Eu 2+ phosphor are evaluated. This work demonstrates a facile and general strategy for synthesizing high-stable all-inorganic cesium-lead-halide QDs for applications in white LED and display devices.

Bionic Gustatory Receptor for pH Identification Based on ZnSnO Nanofiber Synaptic Transistor

Xianglong Wang,Peilong Xu,Wenxin Zhang,Jiaqi Xu,Kai Liu,Guangya Liu,Fengyun Wang

The development of physiology and neurological diseases is normally accompanied by the production of acidic changes, making it crucial to develop biosensing system to detect pH variations to prevent early organ lesions. Due to the electrical double layer at the electrolyte/nanowire interface, artificial synaptic transistors can sensitively detect the pH variations. However, few studies focus on monitoring pH variations of the body based on synaptic transistors. In this study, electrolyte-gated synaptic transistors were fabricated using zinc tin oxide (ZnSnO) nanowires as channel materials. The fabricated devices can successfully mimic the functionality of acid-sensing ion channels (ASICs) in biological synapses, including excitatory postsynaptic currents (EPSCs), paired-pulse facilitations (PPFs), and short-term potentiations (STPs) under acidic conditions. Furthermore, ${3}\times {3}$ ZnSnO synaptic transistor arrays were constructed to monitor acid stimulations of diverse intensities and different regions to mimic the tongue ability of human. This work can not only advance the understanding of ASIC functionality in artificial synaptic devices, but also provide a novel approach to develop bioinspired taste-sensing systems with integrated sensing and memory capabilities.

Laser-Driven White Light Source With High Luminescence Saturation Through Reflective Color Converter

Jiuzhou Zhao,Ziyan Guo,Zikang Yu,Hongjin Zhang,Qing Wang,Yun Mou,Yang Peng