Materials Today Chemistry
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2021
·
IF 8.301
Xiaoyong Huang,Shaoying Wang,Balaji Devakumar,Nan Ma
The development of new efficient and environmental-friendly inorganic phosphors is highly important for phosphor-converted white light-emitting diodes and optoelectronic displays. In this paper, we report a novel and simple one-step solid-state reaction to synthesize lead-free cesium copper halide Cs 3 Cu 2 Br 5 powders with bright blue emission around 460 nm. The preparation process is performed at low calcination temperatures (290–320 °C) and requires no complex apparatus, reagents, or techniques, and thus it holds great potential for mass production of halide emitters. The Cs 3 Cu 2 Br 5 powder phosphors are characterized by X-ray diffraction, field-emission scanning electron microscopy, energy dispersive X-ray spectroscopy, photoluminescence excitation and emission spectroscopy , CIE color coordinates, color purity, photoluminescence quantum yield, and temperature-dependent emission spectra . The effect of calcination temperature on the photoluminescence properties of the as-prepared Cs 3 Cu 2 Br 5 blue phosphors has been investigated and the air-stability property has also been discussed. Impressively, Cs 3 Cu 2 Br 5 blue phosphors show outstanding stability toward air exposure exceeding one month (30 days). Our work will open a new and simple approach to obtain excellent halide emitters for future solid-state lighting and displays.
研究领域:
材料科学
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光学工程
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DOI
高影响因子
APPLIED OPTICS
·
2024
·Vol. 63
·期 5
·1258-1264
·
IF 1.7
Hongliang Zhao,Yating Zhang,Yating Zhang,Jianquan Yao
Lead halide perovskites (LHPs) have been extensively studied due to their remarkable optoelectronic performance. However, the toxicity of a lead ion to humans and its instability under ambient conditions render lead-based halide perovskite an unsuitable material for commercialization. Meanwhile, lead-free halide perovskite (LFHP) devices generally exhibit poor performance. Therefore, enhancing photoelectric conversion capacity is the most important issue that needs to be addressed. Here, we propose a photodetector (PD) fabricated using ${{\rm CsBi}_3}{{\rm I}_{10}}/{\rm phenyl} {\text -} {{\rm C}_{61}}$-butyric acid methyl ester (PCBM) bulk heterojunction as the active layer. The PD illuminated under 532 nm can reach a high responsivity (1.54 A/W) at ${-}{2}\;{\rm V}$ bias, while at 2 V bias, the PD reaches a higher responsivity (224.40 A/W). All of those results suggest that ${{\rm CsBi}_3}{{\rm I}_{10}}/ {\rm PCBM}$ bulk heterojunctions hold enormous potential in substituting for LHPs in optoelectronic devices.
研究领域:
材料科学
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光电子学
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DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Chuangchuang Wei,Jihui Wang,Lijin Wang,Jinxing Zhao,Zhe Yin,Aiwei Tang
Perovskites have made remarkable advancements in optoelectronics owing to their high light absorption coefficient, tunable bandgap, and long charge diffusion. Nonetheless, the practical applications of Pb-based perovskites have been hindered by the instability and toxicity of Pb, especially in flexible electronics, which require high biosecurity and low toxicity. Hence, the development of stable Pb-free perovskite materials has gained increasing attention. In this study, we synthesized stable CsBi3I10 Pb-free perovskites outside the glovebox and improved the optoelectronic and mechanical performances of the CsBi3I10-based flexible devices through polyvinylcarbazole (PVK) doping. Flexible photodetectors with the device structure of PET/ITO/PEDOT:PSS/CsBi3I10:PVK/Au was fabricated. The results indicated that the introduction of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) reduced the surface roughness of the flexible PET substrate, while PVK doping further improved the surface smoothness of CsBi3I10 thin films, thereby enhancing the interfacial charge transportation. Moreover, PEDOT:PSS and PVK acted as stepwise hole transport layers in the photodetectors. The device demonstrated a maximum responsivity of 0.3 A/W, detectivity of 2.6 × 1011 Jones, and a response time of 102 μs at 650 nm. After subjecting it to 1000 bending tests, the light current retained 80% of its initial value. This study presents a universally applicable method for controlling the surface morphology of a flexible perovskite thin film.
研究领域:
材料科学
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光电材料
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柔性电子
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产品关联
DOI
PubMed
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2024
·
IF 3.9
Minjie Wu,Teng Chen,Xuedan Chen,Maoxue Wang,Chen Lv,Kai Meng,shuanglong Yuan
Perovskite-based photodetectors (PDs) are broadly utilized in optical communication, non-destructive testing, and smart wearable devices due to their ability to convert light into electrical signals. However, toxicity and instability hold back their mass production and commercialization. The lead-free Cs2AgBiBr6 double perovskite film, promised to be an alternative, is fabricated by electrophoretic deposition (EPD), which compromises film quality. Herein, we improved the quality of the Cs2AgBiBr6 films and the performance of PDs by adding N-acetylethylenediamine (DEAC) to Cs2AgBiBr6 perovskite precursor for EPD, in which the ligand DEAC provides a pair of lone electrons to Bi3+, forming coordinate covalent bonds. The optimized PDs have high detectivity, up to 4.4×1012 Jones, and high stability in the air. The high-performance, flexible Cs2AgBiBr6 perovskite PDs were fabricated on this basis, it also achieved the detectivity up to 3.2×1012 Jones with excellent bending cycle stability. These results propose a feasible approach to improving the crystallization of double perovskite thin films by introducing ligands during the EPD process. Furthermore, they demonstrate enhanced optoelectronic performance, indicating that this method is also applicable to halide perovskites, offering an effective strategy to improve their film quality.
研究领域:
材料科学
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光电子学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF CATALYSIS
·
2021
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IF 7.92
Daofu Wu,Yan Tao,Yanyi Huang,Benjun Huo,Xusheng Zhao,Jiayu Yang,Xiaofang Jiang,Qiang Huang,Fan Dong,Xiaosheng Tang
Lead halide perovskite nanocrystals (NCs) have been recognized as a rather competitive candidates for potential advanced optoelectronic applications. But the toxicity of lead and the intrinsic instability are the key concerns for their large-scale commercialization. For addressing these tricky issues, we synthesized lead-free all-inorganic Cs 2 AgBiBr 6 double perovskite NCs adopting a facile hot injection approach. The as-prepared NCs could keep their structure stable either in air for more than two months or being heated at 300 °C in ambient atmosphere for 3 h. Moreover, Cs 2 AgBiBr 6 NCs were investigated for photocatalytic NO removal under visible-light irradiation, achieving an exciting removal rate of 97%, which is much higher than the previous reports as we know. In addition, the Cs 2 AgBiBr 6 NCs demonstrated outstanding recyclability for at least four cycles in NO removal. The photocatalytic mechanism of Cs 2 AgBiBr 6 NCs was further proposed. This investigation offers a new environmental photocatalyst to purify the air.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Materials Horizons
·
2021
·Vol. 9
·期 3
·1002-1009
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IF 13.266
Lu Wang,He Qi,Botao Gao,Ye Liu,Hui Liu,Jun Chen
The development of high-performance lead-free piezoceramics for replacing Pb-based perovskites has attracted lots of attention, and comparable room-temperature piezoresponse has been realized in (Na,K)NbO3 and BaTiO3-based ceramics with local structure heterogeneity via adjusting polymorphic phase boundary. In this work, a new method of oxygen octahedron tilt design is used in NaNbO3-based lead-free ceramics, which usually shows complex oxygen octahedron tilt information inherited from NaNbO3. The substitution of Ba(Fe0.5Nb0.5)O3 and BaTiO3 with high tolerance factor into NaNbO3 leads to a gradual elimination of anti-parallel cation displacement and anti-phase tilt along the three axes; as a result, a single tetragonal phase with P4bm space group and only in-phase tilt along c axis is achieved in 0.88NaNbO3–0.04Ba(Fe0.5Nb0.5)O3–0.08BaTiO3 ceramic. Accompanying the decreased oxygen octahedral tilt degree, a drastically improved d33 up to 367 pC N−1 (over ten times that of NaNbO3 ceramic) is obtained, reaching a record high in NaNbO3-based lead-free ceramics. Together with temperature insensitive piezoresponse originating from thermally stable oxygen octahedral tilt structure, the studied NaNbO3-based materials show large potential for replacing Pb-based ceramics in some electronic devices. The oxygen octahedron tilt engineering would be used for designing more high-performance lead-free ceramics with high piezoresponse and excellent thermal stability simultaneously.
研究领域:
材料科学
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物理学
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 26
·15722-15730
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IF 10.733
Xiao-Lei Li,Li-Li Gao,Bin Ding,Qian-Qian Chu,Zhen Li,Guan-Jun Yang
A key challenge in the eco-friendly optoelectronic materials field is to find highly stable and nontoxic perovskite materials. Here, we report the optoelectronic properties and stability of the (C6H5NH3)BiI4 perovskite material. Using an eco-friendly gas pump treatment technique, a dense and pinhole-free (C6H5NH3)BiI4 film was fabricated. Remarkably, a large-area (>20 cm2) Bi-based perovskite film was obtained, which is the largest Bi-based perovskite film ever reported. Besides, the (C6H5NH3)BiI4 perovskite exhibits good solubility in ethanol, which is a safe and eco-friendly solvent. Thermogravimetric analysis results show the beginning of weight loss at ∼184 °C, suggesting excellent heat stability of this material. Most importantly, the (C6H5NH3)BiI4 material can tolerate continuous moisture exposure for 334 days in ambient air owing to the presence of a hydrophobic organic chain. To the best of our knowledge, this is the longest moisture stability reported for lead-free perovskite materials so far. This work paves the way for realizing highly stable and nontoxic perovskite materials for potential optoelectronic applications.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Coatings
·
2022
·Vol. 12
·期 4
·526
·
IF 3.236
Jiaqi Li,Junjun Wang,Fengmin Wu,Hui Ma,Tianyi Ma,Yu Tian,Danqing Liu,Bin Yang
In this paper, Bi2O3-doped (K0.5Na0.5)NbO3(x = 0.1, 0.2, 0.3, 0.4) lead-free ceramics are prepared by a conventional solid-state reaction and analyzed by studying the structure, ferroelectric, and piezoelectric properties. It is found that the doping of Bi2O3increases the proportion of the trigonal phase in KNN ceramics, thus enabling the construction of KNN ceramics with an orthogonal–trigonal phase boundary at room temperature. At the same time, doping with Bi2O3can reduce the grain size and improve grain size uniformity of the ceramics. The KNN-0.1%Bi2O3ceramic has the best piezoelectric properties in all composition; the results are as follows:d33= 121pC/N,kp= 0.474,kt= 0.306.Keywords:KNN lead-free ceramics;Bi2O3doping;grain effects;piezoelectric property
研究领域:
材料科学
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物理学
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产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2021
·
IF 5.165
Hang Ruan,Zhongnan Guo,Jiawei Lin,Kunjie Liu,Lingling Guo,Xin Chen,Jing Zhao,Quanlin Liu,Wenxia Yuan
The Pb-free hybrid-layered-double perovskites (HLDPs) have been proposed as green and stable semiconducting materials for optoelectronic devices, but the synthesized members are still limited. Here, we report the synthesis of three new HLDPs, (C8H20N2)2AgMBr8 (M = In, Sb, and Bi), by a solution method using 1,4-bis(ammoniomethyl)cyclohexane (C8H20N22+) as the organic spacing cation. All three of these HLDPs show ⟨100⟩-oriented layered structures with Ag and In/Sb/Bi order arranged in corner-sharing octahedral layers. The first-principle calculations indicate the indirect-gap nature of (C8H20N2)2AgInBr8 and (C8H20N2)2AgSbBr8, while their Bi counterpart shows a direct band gap after considering spin–orbit coupling. The band gaps obtained by diffuse-reflectance spectroscopy are 3.11, 2.60, and 2.70 eV for M = In, Sb, and Bi, respectively. (C8H20N2)2AgInBr8 shows a broadband red emission centered at 690 nm, and it is mainly attributed to the self-trapped-excitons mechanism. Our results not only provide a series of new “Pb-free” HLDPs with chemical diversity but also help us to further understand the structure–property relationships of HLDP materials.
研究领域:
材料科学
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物理化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 22
·9382-9393
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IF 4.5
Wang Bingying,Zhang Keke,Gao Yijie,Liu Peng,Liu Bo,Zhang Zhansheng
The trend toward miniaturized and highly integrated chip packaging has created a pressing need for lead-free solders with high strength, toughness, and conductivity. In this paper, we designed a scheme of Al 2 O 3 -modified nanomaterial-reinforced low silver Sn1.0Ag0.5Cu (SAC105) solder matrix. To begin with, a novel amorphous carbon and nickel core–shell structure plating modified on Al 2 O 3 (C/Ni/Al 2 O 3 ) were prepared by the electroless plating method. Then, the nano-C/Ni/Al 2 O 3 particle as reinforcement phase was mixed into the matrix solder alloy by ultrasonic vibration stirring. Finally, the morphology and relationship between coated carbon, deposited nickel and original solder interface were analyzed. The microstructure and main properties of the modified solders were also investigated. The experimental results suggested that amorphous carbon and nickel film were prepared on the surface of Al 2 O 3 by electroless plating method. The outer layer of nano-Al 2 O 3 was coated with non-uniform thickness of nickel and carbon coatings. The mass percentage of amorphous carbon was about 3.50%. Adding C/Ni/Al 2 O 3 (0–0.5%) into the SAC105 solder matrix resulted in a gradual increase in conductivity and wettability. The strength and toughness of the modified solder alloy improved as well with the adjunction of reinforced phase. The tensile fracture surface exhibited from a mixture of ductile and brittle, characterized by dimples and cleavage surface, to a purely ductile mode consisting mainly of dimples.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Shujun Zhu,Jianguo Pan,Xinxin Chen,Hongbing Chen,Shangke Pan
Recently, zero-dimensional organic-inorganic lead halides perovskites have garnered considerable attention due to their exceptional photoelectric performance, however, the toxicity of lead makes their prolonged application difficult. In this work, centimeter-scale lead-free zero-dimensional perovskites [Emim] 4 [Cu 4 I 8 ] single crystals were grown by the solution evaporation method. The structure and composition of the crystals were analyzed using XRD , EDS , XPS , etc. The energy band structure and the partial density of states (PDOS) were calculated by using the density functional theory (DFT) based on the PBE hybrid functional. The excitation and emission spectra of the crystal material were determined under different conditions. The luminescence mechanism and fluorescence lifetime of the crystal were also analyzed, and the green emitting of the crystal was caused by self-trapped excitons (STEs). Interestingly, the compound showed excellent responsiveness to X-rays, which is rarely reported in organic-inorganic hybrid copper-based halides. Overall, [Emim] 4 [Cu 4 I 8 ] demonstrates its good potential.
研究领域:
材料科学
·
光学
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产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Min Ye,Fangyuan Lin,Lingou Yang,Jingwen Jin,Xuelian Liu,Yiru Wang,Xi Chen
In this study, a kind of lead-free Cu(I) halide perovskites , Cs 3 Cu 2 I 5 , is synthesized and applied for temperature sensing. A composite thin film combining Cs 3 Cu 2 I 5 with polymethyl methacrylate (PMMA) is developed for optical temperature sensing under different environmental conditions. The Cs 3 Cu 2 I 5 -PMMA films immersed in aqueous solutions exhibit stable sensing ability for at least 24 h, and show fully reversible sensing responses for the temperature change in the range from 30 °C to 80 °C with a temperature sensitivity up to 2.3% K −1 . The sensing performance and stability of the Cs 3 Cu 2 I 5 -PMMA film show that it can be a type of temperature sensing materials with great potential. This work opens up a new use of lead-free copper-based halide perovskites and provides a new temperature sensing material.
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
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