ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Fanju Zeng,Yuanyang Guo,Wei Hu,Yongqian Tan,Xiaomei Zhang,Julin Feng,Xiaosheng Tang
Recently, several types of lead halide perovskites have been demonstrated as active layers in resistive switching memory or artificial synaptic devices for neuromorphic computing applications. However, the thermal instability and toxicity of lead halide perovskites severely restricted their further practical applications. Herein, the environmentally friendly and uniform Cs3Cu2I5 perovskite films are introduced to act as the active layer in the Ag/Cs3Cu2I5/ITO memristor. Generally, the Ag ions could react with iodide ions and form AgIx compounds easily, so the Ag/PMMA/Cs3Cu2I5/ITO memristor was designed by employing the ultrathin polymethylmethacrylate (PMMA) layer to avoid the direct contact between the top Ag electrode and Cs3Cu2I5 perovskite films. After optimization, the obtained memristor demonstrated bipolar resistive switching with low operating voltage (< ±1 V), large on/off ratio (102), stable endurance (100 cycles), and long retention (>104 s). Additionally, biological synaptic behaviors including long-term potentiation and long-term depression have been investigated. By using the MNIST handwritten recognition data set, the handwritten recognition rate based on experimental data could reach 94%. In conclusion, our work provides the opportunity of exploring the novel application for the development of next-generation neuromorphic computing based on lead-free halide perovskites.
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高影响因子
Advanced Optical Materials
·
2023
·
IF 9
Gaolei Dong,Weichen Li,Lu Zhang,Weixiong Cai,Bobo Yang,Rongrong Hu,Qianqian Zhou,Shiliang Mei,Jun Zou
Cu-based perovskites have excellent optical properties, environmental friendliness, and broad optical applications. However, their development is hindered by complex preparation methods and poor hydrochromic stability. In this work, a solvent-evaporation-based crystallization strategy combined with Sn doping for the preparation of Cs 3 Cu 2 I 5 microcrystals (MCs) is reported. This strategy enhances the photoluminescence quantum yield (PLQY) and hydrochromic reliability. In addition, first-principles calculations reveal the effect of Sn doping on the lattice structure and exciton–phonon coupling of the Cs 3 Cu 2 I 5 MCs. The results show that Sn doping reduces the lattice spacing as a result of the substitution radius difference between Cu + and Sn 2+ ions, which causes stronger exciton–phonon coupling and enhances the PLQY. Moreover, the Sn-doped Cs 3 Cu 2 I 5 MCs show excellent reliability on heating and under hydrochromic cycles and long-term luminescence conditions. Based on their hydrochromic and temperature-responsive properties, the Sn-doped Cs 3 Cu 2 I 5 MCs are applied as encryptable printing materials for information encryption and decryption and as a fluorescence-based temperature sensor, combined with Machine-Learning to guide the manufacturing of fluorescent thermometers. The findings provide insights into the commercial value of copper-based perovskites and demonstrate their potential anti-counterfeiting, fluorescence temperature sensing applications.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Xinjian He,Yuyan Zhuang,Danhong Gao,Hongwei Liu,Jintuo Zhu,Sheng Huang
Carbon monoxide is a colorless, odorless gas that can cause irreversible effects on the brain if inhaled in excess. Accurate measurement of carbon monoxide is very important for human health. The current carbon monoxide sensors work with long response time and narrow detection range. Therefore, in this work, TiO 2 was coated on perovskite nanocrystals Cs 3 Cu 2 I 5 by solution method to obtain high performance carbon monoxide gas sensitive material Cs 3 Cu 2 I 5 /TiO 2 nanocrystals. Moreover, high precision and anti-interference measurement of carbon monoxide was realized by combining with machine learning. The carbon monoxide sensor based on Cs 3 Cu 2 I 5 /TiO 2 has a short response/recovery time of 3.8/17.5 s and a sensitivity of 0.36 at 10 ppm. Then, an intelligent classification algorithm is used to quickly identify the concentration of carbon monoxide gas, and the recognition accuracy is as high as 99.5 %, which is higher than that of traditional sensitivity determination of gas concentration methods, due to the fact that machine learning involves multiple features of the electrical response curve, rather than the single feature of traditional sensitivity determination methods. Finally, the sensor was integrated into the self-rescuer for coal mine to realize the intelligent opening in the presence of CO, and improved the rescue efficiency. We believe that this sensor will be promising in the field of carbon monoxide, and the idea of using machine learning to intelligently recognize gas concentrations can be extended to other gas sensors.
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MOLECULES
·
2026
·Vol. 31
·期 8
·1354
·
IF 5.1
Wang Zhou,Tianyun Du,Chunqian Xu,Xiuxun Han
Cs3Cu2I5single crystals are regarded as promising next-generation scintillators due to their large Stokes shift and low self-absorption characteristics. However, the cost-effective solution growth method faces critical challenges: the instability of colloidal precursors in solutions and the severe oxidation of Cu+during crystal growth. This study innovatively introduces yttrium chloride (YCl3) as a dual-functional additive to address both issues simultaneously. The hydrolysis of YCl3creates a controlled acidic environment, effectively suppressing the oxidation of Cu+; meanwhile, it enhances the stability of colloidal precursors by significantly increasing their surface charge and narrowing the particle size distribution. These synergistic effects enable the rapid growth (approximately 100 h) of near-centimeter-sized Cs3Cu2I5single crystals with high crystallinity, without the need for inert gas protection. The optimized crystals exhibit exceptional performance: a photoluminescence quantum yield (PLQY) of 93.22% ± 0.47%, a scintillation decay time of 210.04 ns, and a light yield of ~738.14 pe/MeV. This YCl3-mediated growth strategy establishes an efficient approach for the solution-based synthesis of high-quality Cs3Cu2I5single crystals, holding great significance for advancing high-sensitivity, environment-stable radiation detection applications such as medical diagnostics and nuclear safety monitoring.
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JOURNAL OF LUMINESCENCE
·
2026
·
IF 3.8
Jingran Zhang,LiYan Zheng,Guifu Zuo,Yuchen Yue,Qian Zhang,Mengnan Zhang
Lead-free copper halides have emerged as promising self-trapped exciton (STE) emitters for broadband white-light generation, yet the direct construction of compositionally regulated single-matrix white emitters remains challenging. This study presents an mPEG-NH 2 -directed phase-engineering strategy for the one-step in situ construction of biphasic Cs 3 Cu 2 I 5 /CsCu 2 I 3 copper halides. By introducing methoxy polyethylene glycol amine into the ligand-assisted reprecipitation (LARP) process, the local coordination environment and supersaturation-driven nucleation behavior of Cs + , Cu + , and I − species are regulated, enabling the coexistence of blue-emitting Cs 3 Cu 2 I 5 and yellow-emitting CsCu 2 I 3 within one crystallization system. The amino and ether oxygen sites of mPEG-NH 2 further promote interfacial coupling with the copper halide matrix, reducing non-radiative STE deactivation and improving radiative recombination. The optimized CCI:3P sample exhibits broadband white-light emission with Commission Internationale de l’Éclairage (CIE) coordinates of (0.3236, 0.3347), a photoluminescence (PL) quantum yield of 42.8%, and a prolonged exciton lifetime. A UV-pumped WLED based on CCI:3P emits white light with a correlated color temperature of 6052 K. In addition, the biphasic material exhibits distinct water- and heat-induced luminescence changes, demonstrating stimulus-dependent optical contrast. This work provides a polymer-directed strategy for designing lead-free copper halide emitters with integrated white-light emission and responsive optical functionality.
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Materials Today Chemistry
·
2020
·
IF 0
Xiaoyong Huang,Qi Sun,Balaji Devakumar
The discovery of new environmentally friendly luminescent materials with high photoluminescence quantum yield and long-term stability is critical for future solid-state lighting and displays applications. Although lead halide perovskite materials with excellent optical properties have been extensively investigated in recent years because they hold tremendous promise in optoelectronic devices, the toxicity of lead and poor air-stability still hinder their commercial applications. Moreover, while substantial work has been done on three-dimensional (3D) perovskite halides, the zero-dimensional (0D) halide emitters with bright luminescence remain elusive. Herein we report a facile solid-state reaction method to prepare an efficient lead-free all-inorganic halide material with 0D structure, Cs 3 Cu 2 I 5 , with photoluminescence quantum yield up to 80%. Under ultraviolet excitation at 313 nm, the Cs 3 Cu 2 I 5 powder phosphors show a strong blue photoluminescence emission with peak at 445 nm and CIE color coordinates of (0.1486, 0.0873). Notably, Cs 3 Cu 2 I 5 exhibits good color stability at high temperatures and outstanding stability towards air exposure exceeding one month (30 days). These findings not only open up a door for the development of promising highly emissive low-dimensional halide materials for lighting and displays, but also offer a new scalable approach for the potential mass production of halide emitters.
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JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Yunxue Teng,Mu Gu,Zhixiang Sun,Xiaolin Liu,Bo Liu,Juannan Zhang,Shiming Huang,Chen Ni
Improving the spatial resolution of X-ray imaging is one of the main directions of scintillation screen research. Herein, a structured Cs 3 Cu 2 I 5 scintillation screen based on oxidized silicon micropore array template was developed. A feasible method was explored to solve the problems such as the preparation of oxidized silicon micropore array template with micron-period structure and the compact filling of Cs 3 Cu 2 I 5 scintillator into the template. The X-ray imaging resolution using the structured Cs 3 Cu 2 I 5 scintillation screen reaches 113 lp/mm attributing to the light guide and optical isolation of the template pore walls. The results of detective quantum efficiency, the X-ray imaging photographs of a micro-resolution plate and a small zebrafish show that the image quality using the structured screen is excellent. Meanwhile, the developed Cs 3 Cu 2 I 5 scintillation screen exhibits good radiation resistance, which can keep the light output basically unchanged when the radiation dose is up to 43.2 Gy. The screen also exhibits good luminescence stability compared to Cs 3 Cu 2 I 5 itself due to the protection of the template. These indicate that the structured Cs 3 Cu 2 I 5 scintillation screen has a good application prospect in high-resolution X-ray imaging.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Qi-Hua Yang,Gui-Hua Li,Yu-Chen Ao,Shu-Juan Zhao,Han-Qi Wei,Le Fu,Zhi-Wei Luo,Tian-Liang Zhou,Chu-Jie Wang,Ge-Mei Cai
As a new generation of environmentally friendly halide materials, Cs 3 Cu 2 I 5 shows up the promising application in scintillation, LED, and photoelectric detection fields. However, liquid phase methods cannot produce Cs 3 Cu 2 I 5 on a large scale, and the preparation process is accompanied by serious pollution. Although the ball milling method can solve the problems caused by the liquid phase synthesis method, the Cs 3 Cu 2 I 5 obtained has many surface defects and low luminescence efficiency. In this work, a strategy of doping-assisted ball-milling synthesis using ZnI 2 is proposed. Similar to the chemical preparation of Cs 3 Cu 2 I 5 , the iodine-rich environment during the modified ball milling process can also play a role in repairing surface defects. And it has been demonstrated through experiments and first principles calculations that the distortion of [Cu 2 I 5 ] 3- under ground/excited state can be adjusted through doping Zn into the Cu1 site, the formation barrier of self-trapped excitons is reduced, and the luminous efficiency of Cs 3 Cu 2 I 5 is significantly improved. Subsequently, using the simple hot-pressing method, the representative Cs 3 Cu 2 I 5 :1.0Zn sample was combined with commercially available polypropylene to fabricate Cs 3 Cu 2 I 5 :1.0Zn@PP film. Finally, the potential applications of the newly-developed film in portable and customizable WLED and scintillation fields were explored.
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ACS Applied Electronic Materials
·
2025
·
IF 4.7
Li Xiao,Xiuxian Li,Zhukang Zhang,Yue Long,Gang Wang,Hengxiang Gong
Integrating wide band gap semiconductor materials with silicon (Si) to create heterojunctions is an effective strategy for enhancing the ultraviolet (UV) sensitivity of optoelectronic devices. However, epitaxially growing high-quality wide band gap films on Si substrates at low temperatures without compromising the properties of Si remains challenging. In this study, we introduce a low-cost mist chemical vapor deposition (CVD) technique to deposit Cs3Cu2I5 perovskite films and fabricate a simple-structured Cs3Cu2I5/n-Si planar heterojunction. This technique enables an orderly deposition and rapid crystallization process, distinct from traditional solution-based methods. Herein, we report for the first time a compact, thick Cs3Cu2I5 film with an average grain size of 5.27 μm and a thickness of approximately 2.8 μm exhibiting orientated growth along the (303) plane. Furthermore, the simply constructed Cs3Cu2I5/n-Si photodiode exhibited a maximum photoresponsivity of 186 mA W–1 and a specific detectivity of 2.5 × 1012 Jones under 278 nm illumination. The on–off cycling tests demonstrated excellent operational stability, with unpackaged devices retaining 90% of their initial photocurrent after two months of storage under ambient conditions.
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APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Lin Li,Yilong Ren,Jincong Pang,Tao Lin,Jie Sun,Ruiguang Peng,Kai Gao
A Cs 3 Cu 2 I 5 perovskite scintillator film with ordered array structure is fabricated via AAO-templated in-situ growth. • The AAO template guides photon propagation and reduces optical crosstalk, achieving 15.5 lp mm -1 at MTF 0.2. • The Cs 3 Cu 2 I 5 -AAO composite scintillator shows an ultralow detection limit of 92 nGy s -1 and excellent stability. • This work offers a scalable, eco-friendly strategy for high-performance pixelated scintillators in X-ray imaging. Scintillators are essential for X-ray imaging as they convert high-energy radiation into detectable visible light, thereby directly determining the spatial resolution and sensitivity of the imaging system. Among these, pixelated scintillator films based on the optical waveguide effect are considered an ideal structure for achieving high-resolution imaging. However, their efficient and high-precision fabrication remains challenging. To address these challenges, this study introduces a strategy for the in-situ growth of lead-free perovskite scintillator Cs 3 Cu 2 I 5 within an anodic aluminum oxide (AAO) template via a vacuum-assisted infiltration method, resulting in the successful fabrication of a Cs 3 Cu 2 I 5 -AAO composite scintillator film featuring a well-ordered array structure. The ordered nanoporous structure of AAO guides photon propagation, minimizing lateral scattering and significantly enhancing light extraction and spatial confinement. X-ray imaging experiments demonstrate that the fabricated scintillator film achieves a spatial resolution of 15.5 lp mm −1 at a modulation transfer function (MTF) of 0.2. Moreover, the material exhibits a low detection limit of 92 nGy s −1 and maintains excellent stability under continuous X-ray irradiation, highlighting its outstanding overall scintillation performance. By integrating material design with structural engineering, this work provides a scalable and effective strategy for designing environmentally friendly and high-performance scintillators for next-generation X-ray imaging applications. Download: Download high-res image (171KB) Download: Download full-size image
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Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 25
·8524-8532
·
IF 6.4
Luojia Huang,Hangtao Ye,Weidong Xiang,Hongbin Fan,Xiaojuan Liang
Zero-dimensional lead-free metal halides Cs3Cu2X5 (X = Cl, Br, and I) have attracted much attention in recent years due to their unique structure, photoelectric properties and environment-friendly nature; unfortunately they are sensitive to humidity. Herein, Cs3Cu2I5 nanocrystals (NCs) were successfully precipitated in situ within glass using the methods of melt quenching and heat treatment (Cs3Cu2I5 glass ceramic). The optical characterization and morphological characterization provide evidence for the successful in situ precipitation of the Cs3Cu2I5 glass ceramic, and the photoluminescence quantum yield (PLQY) is as high as 63.3%. The water stability of Cs3Cu2I5 NCs is greatly improved due to the inorganic glass matrix, and the fluorescence intensity remains largely unchanged for 30 days. The Cs3Cu2I5 glass ceramic endows Cs3Cu2I5 NCs with a wider range of application areas. Finally, by constructing an X-ray imaging system using Cs3Cu2I5 glass ceramics, springs in opaque samples were observed to be visible, demonstrating the great potential of Cs3Cu2I5 glass ceramics with long-term stability for X-ray detection imaging.
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JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Fanju Zeng,Yuanyang Guo,Wei Hu,Yongqian Tan,Xiaomei Zhang,Jie Yang,Qiqi Lin,Yao Peng,Xiaosheng Tang,Zhengzheng Liu,Zhiqiang Yao,Juan Du
Metal halide perovskites have aroused extensive attention due to their excellent photoelectric properties . But the toxicity and instability of lead-based perovskite restrict their development severely. Recently, lead-free Cu-based perovskites have emerged as promising environmental friendly photoelectric materials on account of their low toxicity and equally excellent properties. Here, we report the highly uniform lead-free Cs 3 Cu 2 I 5 perovskite films with the long-term air-stability prepared by using methyl acetate as anti-solvent during the fabrication. The crystal structure, surface morphology , bandgap, and optical property of the Cs 3 Cu 2 I 5 perovskite films are investigated. Even though the Cs 3 Cu 2 I 5 perovskite films prepared with or without anti-solvent demonstrate the same crystal structure of the orthorhombic phase, by the anti-solvent approach, Cs 3 Cu 2 I 5 perovskite films exhibit an enhanced photoluminescence quantum efficiency (PLQY) from ~62% to ~76.0% and have a relatively smaller surface roughness ~17.5 nm. Most importantly, Cs 3 Cu 2 I 5 perovskite films exhibited long-term air-stability, and the PLQY could still reach 76.3% after storing for several months under an ambient atmosphere. All the results demonstrate the quality and the PLQY of Cs 3 Cu 2 I 5 perovskite films could be effectively improved by the anti-solvent assisted crystallization strategy, showing potential applications in the fabrication of photoelectric devices based on lead-free perovskites.
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