ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 47
·2105771
·
IF 18.808
Fei Zhang,Wenqing Liang,Lintao Wang,Zhuangzhuang Ma,Xinzhen Ji,Meng Wang,Yue Wang,Xu Chen,Di Wu,Xinjian Li,Yu Zhang,Chongxin Shan,Zhifeng Shi
Hydrochromic materials have attracted widespread attention in the fields of anti-counterfeiting because of their ability of the reversible light absorption and/or emission properties in response to water. Here, for the first it is demonstrated that the ternary copper halides Cs 3 Cu 2 I 5 nanocrystals (NCs) possess excellent hydrochromic properties. The prepared Cs 3 Cu 2 I 5 NCs films can dynamically extract and insert CsI by exposing/removing water to realize the reversible conversion between blue-emissive Cs 3 Cu 2 I 5 and yellow-emissive CsCu 2 I 3 . Interestingly, polymethyl methacrylate (PMMA) coated Cs 3 Cu 2 I 5 can effectively avoid the extraction of CsI and maintain long-term stability in the water. Further, the hydrochromic Cs 3 Cu 2 I 5 and water-resistant Cs 3 Cu 2 I 5 @PMMA are used as the inks to synergistically act on anti-counterfeiting information to achieve multiple encryption effects, which can clearly identify and authenticate the effective information after moisture decryption. Importantly, the pattern can be re-encrypted to the invalid pattern after water evaporation. In addition, the anti-counterfeiting pattern has excellent stability during repeated encryption/decryption conversion cycles, which can not only balance the accessibility of anti-counterfeiting information but also effectively improve the security of information. This new discovery may not only deepen the understanding of Cs 3 Cu 2 I 5 but also provide new options for the design of hydrochromic materials for anti-counterfeiting information.
研究领域:
材料科学
·
光学
·
防伪技术
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2024
·Vol. 12
·期 27
·2401098
·
IF 8
Meifeng Jiang,Xinle Lu,Maosheng Chen,Wenyi Tong,Hechun Lin,Chunhua Luo,Hui Peng,Chungang Duan
Crown ether-assisted supramolecular assembly is a robust strategy for manipulating low-dimensional metal halides. In this study, the supramolecular assembly of 0D-Cs 3 Cu 2 I 5 is presented. Upon the addition of 15-crown-5 (15C5) to Cs 3 Cu 2 I 5 , 15C5 immediately coordinates with Cs + to form the cone-shaped [(15C5)Cs] + . Simultaneously, one of the iodine atoms is removed from the [Cu 2 I 5 ] 3- cluster, resulting in the formation of a sub-planar rhombic [Cu 2 I 4 ] 2− unit. This process leads to white emission, specifically [(15C5)Cs] 2 [Cu 2 I 4 ], which exhibits a photoluminescence quantum yield (PLQY) close to unity. The [(15C5)Cs] + further reacts with 15C5 to form the sandwich-type cationic structure [(15C5) 2 Cs] + , accompanied by the generation of red emission [(15C5) 2 Cs] 2 [Cu 2 I 4 ]. By carefully controlling the amount of 15C5, various emission composites can be achieved, particularly tunable white emission. The assembly process is reversible. The pristine Cs 3 Cu 2 I 5 can be recovered after thermal curing because of the volatility of crown ether and the weak Cs-crown ether bond. Theoretical calculations have demonstrated that the coordination of the crown ether primarily affects the energy level, leading to changes in the excited state and photophysical properties. The applications in anticounterfeiting and LED phosphors have been demonstrated. This work provides a new approach for the development of low-dimensional copper halides with promising applications in optoelectronics.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Xing Xu,Chao Fan,Zhuodong Qi,Sha Jiang,Qin Xiao,Huikang Liang,Huigao Duan,Qinglin Zhang
Cesium copper (I) halides, as a lead-free halide material system, have shown great potential in optoelectronic devices due to their environmental friendliness, high quantum efficiency, and extraordinary air stability. However, most of the previous reports are on quantum dots, bulk crystals, or free-standing wires. It is still challenging to realize the in-plane growth of one-dimensional (1D) cesium copper (I) halides on various substrates, which is essential for nanodevices with high integration density. Herein, we report the planar growth of CsCu2I3 nanoribbons (NBs) with high-quality single crystals on diverse substrates through a spatial-confined method. The in situ investigation of the growth process reveals that the morphology evolution of the NBs is controlled by both thermodynamics and kinetics that are dependent on the local supersaturation near the NBs. The CsCu2I3 NB-based photodetectors (PDs) exhibit an outstanding ultraviolet (UV) detection performance with a high responsivity (0.27 A/W), a specific detectivity (6.38 × 108 Jones), and a fast photoresponse speed (trise/tdecay = 5.8/6.0 ms). Furthermore, the PDs exhibit high stability to light illumination and excellent flexibility to bending. The direct in-plane growth of the lead-free CsCu2I3 NBs on various substrates would promote the practical application of copper (I) halides in electronics and optoelectronics.
研究领域:
材料科学
·
光电材料
·
纳米技术
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Yichen Zhu,Yubin Kang,Jing Su,Zhi Wen,Mingchun Li,Qiangqiang Zhu,Yue Zhai,Juan Kang,Yanghui Li,Le Wang
Lead halide perovskites have garnered interest in light-emitting diode (LED) applications due to their strong emission and tunable properties. However, conventional synthesis methods involve energy-intensive thermal processes and hazardous organic solvents, raising environmental concerns. In this study, we report a simple and eco-friendly mechanochemical approach that produces phase-pure blue-emitting Cs3Cu2I5 (emission at 440 nm) and yellow-emitting CsCu2I3 (emission at 570 nm) phosphors through polarity modulation and control of grinding duration. Our comprehensive analysis of the phase transitions during mechanochemical synthesis reveals that pure Cs3Cu2I5 was synthesized from a 3:2 precursor molar ratio in ethanol for 30 min, while pure CsCu2I3 was obtained from a 1:2 precursor molar ratio in an aqueous solution for 7.5 min. Moreover, Raman spectroscopy, X-ray diffraction, and energy-dispersive X-ray spectroscopy analyses confirmed that phase-pure phosphors were achieved through these methods. Finally, we fabricated a series of color-adjustable LEDs by mixing Cs3Cu2I5 and CsCu2I3 phosphors in different proportions. This demonstrates the potential of our mechanochemical synthesis for the efficient, large-scale production of next-generation lighting materials with tunable emission.
研究领域:
材料科学
·
光学工程
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 21
·12326-12335
·
IF 4.22
Qu Junfeng,Xu Shuhong,Liu Fan,Wang Zhuyuan,Shao Haibao,Cui Yiping,Wang Chunlei
Abstract Compared with widely studied lead halide perovskite, copper halide perovskite is toxic-free and combines better stability with comparable photoluminescence quantum yield. Cation doping has proven to be an effective way to manipulate optical and electronic properties of perovskite. Unlike lead halide perovskite able to act as the host of different kinds of dopant, copper halide perovskite acting as host material is still a great challenge. Herein, Mn was successfully doped into Cs \(_3\) Cu \(_2\) I \(_5\) under room temperature via solid-state reaction. In addition to original self-trapped emission of Cs \(_3\) Cu \(_2\) I \(_5\) at 445 nm, Mn dopant introduced characteristic emission at \(\sim \) 550 nm and realized dual color emission tuned by feeding ratio, extending chroma of Cs \(_3\) Cu \(_2\) I \(_5\) in blue region. Meanwhile, ultraviolet photo-electron spectra results confirmed that Mn \(^{2+}\) ion replacing Cu \(^+\) resulted in p-type doping in Cs \(_3\) Cu \(_2\) I \(_5\) . The as-prepared Mn:Cs \(_3\) Cu \(_2\) I \(_5\) microcrystals show excellent stability with almost unchanged PL intensity within 15 days. Graphical abstract
Synthesis of p-type Mn:Cs3Cu2I5 with dual-color emission through room-temperature grinding method.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Ziheng Zhao,Xitao Li,Lingling Xie,Bingkun Chen,Ting Jiang,Jie Cao,Fa Zhang,Min Wang,Yafeng Wu,Hong Zheng,Fang Zhang,Yongtian Wang
Lead-free metal halide perovskites have attracted much attention owing to their non-toxicity and excellent optical properties . Especially, cesium copper iodide compounds exhibit advantages of good environmental stability and low cost, rendering promising potential applications in optoelectronic devices field. Here, we use an anti-solvent assisted crystallization method to realize phase control syntheses of CsCu 2 I 3 and Cs 3 Cu 2 I 5 by varying the concentrations of precursor solution. Using high precursor solution concentrations, Cs 3 Cu 2 I 5 with strong blue emission peak at 440 nm is prepared. While the CsCu 2 I 3 is fabricated at low precursor solution concentrations, with the yellow emission peak of 580 nm. Furthermore, the UV-pumped light-emitting diodes (UV-LEDs) are realized by adopting CsCu 2 I 3 and Cs 3 Cu 2 I 5 powders as phosphors, and we also obverse the scintillation characteristic of the cesium copper iodide powders, showing potential applications for lighting and X-ray detection devices.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2025
·
IF 4.2
Fushuai Li,Chuanhe Ma,Shu Li,Jinchun Jiang,Hailong Wang
Cesium copper iodine (CsCuI) perovskite LED (PeLED) possesses several advantages, including eco-friendly, high stability, abundant elements, and low cost. Improving the photoluminescent performance and stability of the CsCuI perovskite thin film, which serves as the emissive layer, is crucial for enhancing the overall PeLED performance. This paper reports a dual optimization strategy (DOS) that uses a novel mixed toluene (Tol) and oleic acid (OA) reagent. Tol acts as an antisolvent, and OA serves as a passivator. Experimental results show that the DOS increases crystal nucleation rate and mitigates film defects. The photoluminescence quantum yield (PLQY) of the Cs 3 Cu 2 I 5 perovskite thin film prepared by DOS exceeds 90 %, and after 40 days of storing in air, the PLQY remains at the initial 88 %. This DOS, mixing antisolvent and passivator, also provides new ideas for improving other lead-free metal halide perovskites.
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
Photonics Research
·
2021
·Vol. 9
·期 3
·351-356
·
IF 7.08
Qiang Xu,Juan Wang,Qindong Zhang,Xiao Ouyang,Xiao Ouyang,Maheng Ye,Weiting Xie,Xuewen Yan,Deyuan Li,Xiaoping Ouyang,Xiaoping Ouyang,Xiaoping Ouyang,Xiaobing Tang,Xiaodong Zhang
Bulk scintillators that are with high density, low cost, and fine pulse-height energy spectral resolution, and are non-hygroscopic and user friendly, are desired for high-energy gamma-ray spectroscopy application. Recently, low-cost solution-processed perovskite nanoscintillators have been demonstrated with outstanding performances for indirect low-energy X-ray detection; however, the stability and thickness are not suitable for high-energy gamma-ray detection. Here, we report scintillation performances of a low-cost solution-processed bulk 0D Cs3Cu2I5 single crystal. The self-trapped exciton emission results in a large Stokes shift (109 nm) that is reabsorption free. A broad X-ray excited emission matches well with the sensitivity of a silicon photodiode. The unique Cs+ surrounded isolated [Cu2I5]3− cluster scintillator provides ultra-stability in air and strong radiation hardness under high-dose gamma-ray exposure from a 60Co source. This solution-processed Cs3Cu2I5 scintillator is expected with low-cost and has detection performances comparable to commercial alkali-halide scintillator products.
研究领域:
材料科学
·
核技术应用
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Xiu-Rong Yuan,Xiao-Song Zhang,Xing-Yao Zhao,Xiao-Kai Gong,Li−Na Kong,Bao-Zeng Zhou,Jian-Ping Xu,Lan Li
The outstanding photovoltaic characteristics of lead halide perovskites have made them a potential class of materials for upcoming optoelectronic applications. However, a major obstacle to the practical use of lead halide perovskites is the inherent toxicity and low environmental stability of lead. The exploration and development of nontoxic and stable alternatives for lead halide perovskites has therefore become an urgent and critical goal in the field of photovoltaics. In this paper, blue lead-free Cs3Cu2I5 nanocrystals (NCs) with bright emission were prepared by using KI as a metal additive through an improved thermal injection strategy. A breakthrough in the previous photoluminescence quantum (PLQY) yield of 97.2% was achieved when the content of KI was optimized to be 8%. Detailed experimental and theoretical studies have also been combined to conclude that the KI additive acts to passivate surface defects and that the broad-spectrum blue emission originates from self-trapped excitons. When combined with commercial indium tin oxide (ITO), the device may achieve broad-spectrum blue electroluminescence. Its low production cost and simple structure are its main features. Furthermore, we were able to improve the utilization of high-energy ultraviolet energy and overcome the weak absorption of short-wavelength silicon-based solar cells by using nanocrystals as down-conversion luminescent materials in conjunction with silicon-based solar cells. This increased the photoelectric conversion efficiency (PCE) for the solar cells through approximately 0.5%. The result was achieved through the principle of down-conversion. Therefore, fully inorganic metal halide Cs3Cu2I5: K+ nanocrystals have great potential for future electroluminescence and photovoltaic applications.
研究领域:
材料科学
·
光电子学
·
光伏技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Electronic Materials
·
2025
·
IF 4.7
Li Ding,Yuyang Li,Hui Liu,Lixiang Wang,Deren Yang,Yanjun Fang
Lead-free perovskites nanocrystals (PNCs) have attracted significant attention as promising candidates for X-ray detection due to their high X-ray stopping power, remarkable radioluminescence light yield and favorable biocompatibility. However, the bulk and surface defects in the PNCs, formed during the purification or device fabrication process, may remarkably affect the charge transport properties and stability of the detectors. In this study, we discovered that the Cs3Cu2I5 PNCs are quite sensitive to the thermal annealing temperature, and a high temperature larger than 100 °C can trigger the decomposition of the PNCs and therefore the generation of bulk defects within them. By optimizing the annealing process, we are able to achieve the efficient solvent evaporation while maintaining the structure integrity of the PNCs. Additionally, a NaI assisted in situ surface passivation strategy was proposed to repair the surface defects caused by ligand detachment during the PNC purification process, further reducing the nonradiative recombination and suppressing the ion-migration effect. The resultant Cs3Cu2I5 PNC-organic bulk heterojunction nanocomposite X-ray detectors achieve a remarkable sensitivity of over 4000 μC·Gyair–1·cm–2 and a low detection limit of 30 nGyair·s–1, alongside enhanced response speed and irradiation stability, positioning them among the best-performing lead-free perovskite film-based X-ray detectors reported to date.
研究领域:
材料科学
·
光电子器件
·
辐射探测技术
✓ 已验证
产品关联
DOI
高影响因子
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.
研究领域:
材料科学
·
光电材料
✓ 已验证
DOI
高影响因子
Advanced Science
·
2022
·Vol. 9
·期 15
·2103735
·
IF 17.521
Lulu Liu,Weijun Li,Xiaopeng Feng,Chunjie Guo,Huimao Zhang,Haotong Wei,Bai Yang
Metal halide perovskite scintillators encounter unprecedented opportunities in indirect ionizing radiation detection due to their high quantum yields. However, the long scintillation lifetime of microseconds upon irradiation, known as the afterglow phenomenon, obviously limits their fast development. Here, a new type of hybrid X-ray detector wafer combining direct methylamine lead iodide (MAPbI 3 ) semiconductor and indirect zero-dimensional cesium copper iodide (Cs 3 Cu 2 I 5 ) scintillator through low-cost fast tableting processes is reported. Due to the fast energy transfer from Cs 3 Cu 2 I 5 to MAPbI 3 , the device response time to X-rays is dramatically reduced by nearly 30 times to 36.6 ns, which enables fast X-ray detection capability by a large area detector arrays within 1 s. Moreover, Cs 3 Cu 2 I 5 exists at the grain boundaries of MAPbI 3 crystals, and blocks the paths of mobile ions of perovskite, leading to the lowest detectable dose rate of hybrid X-ray detector is thus reduced by 1.5 times compared with control MAPbI 3 direct-type semiconductor, and 10 times compared with the Cs 3 Cu 2 I 5 indirect-type scintillator. The direct/indirect hybrid wafer also exhibits improved operation stability at ambient conditions without any encapsulation. This new kind of hybrid X-ray detectors provides strong competitiveness by combining the advantages of both direct perovskite semiconductors and indirect perovskite scintillators for next-generation products.
研究领域:
材料科学
·
物理学
·
辐射检测
·
半导体器件
✓ 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）