JOURNAL OF THE CHINESE CHEMICAL SOCIETY
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2023
·Vol. 70
·期 7
·1481-1492
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IF 1.8
Jia-Rong Xue,Rong-Chao Xue,Pei-Yao Chen,Yong Wang,Li-Ping Yu
In this study, a hydrostable Z-scheme Ag/CsPbBr 3 /Bi 2 WO 6 photocatalyst was designed and fabricated for the degradation of Rhodamine B (RhB). The structural instability of CsPbX 3 perovskites in water is one of the main obstacles that restrict their practical application in photocatalytic wastewater treatment. The photocatalyst was prepared in three steps: passivation of CsPbBr 3 nanocrystals (NCs) with 3-mercaptopropionic acid (MPA), construction of a heterojunction between MPA-passivated CsPbBr 3 NCs and Bi 2 WO 6 ultrathin nanosheets, and doping Ag nanoparticles as charge mediators in the heterojunction. The as-obtained 5%Ag/20%CsPbBr 3 /Bi 2 WO 6 exhibits good stability and excellent photocatalytic activity. The degradation rate is 93.9% in 120 min, which is 4.41 times than that of Bi 2 WO 6 .
研究领域:
环境科学
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材料科学
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DOI
高影响因子
MICROCHIMICA ACTA
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2021
·Vol. 188
·期 11
·1-9
·
IF 5.833
Chen Shuqin,Huang Mengna,Huang Mianli,Feng Liang
A strategy based on CsPbBr 3 quantum dots (QDs) is described for the determination of ziram pesticide. A facile and inert gas-free method was used for the synthesis of CsPbBr 3 QDs. The obtained CsPbBr 3 QDs displayed turn-off fluorescence behavior for ziram. The fluorescence intensity of the CsPbBr 3 QDs ( E x / E m = 365/516 nm) was inversely proportional to the concentration of ziram (0.10 to 50.0 ppm) with a detection limit of 0.086 ppm. Notably, satisfactory recoveries (100 ± 0.25 to 107 ± 5.72%) were obtained in spiked fruit samples, which demonstrated that this method is capable of detecting ziram in real samples. In addition, the mechanism for the detection of ziram was investigated in detail. According to the results, this mechanism can be tentatively explained by fluorescence quenching originating from the increased surface defects and the structural changes of the CsPbBr 3 QDs. The detection ability of this strategy shows promising applicability in food safety. Graphical abstract
研究领域:
分析化学
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环境科学
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食品科学
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DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
·
IF 6.361
Qi Wang,Wenzhi Wu,Ruirui Wu,Sen Yang,Yunxia Wang,Jixiang Wang,Zhijun Chai,Qiuju Han
Here, Cs 4 PbBr 6 microcrystals (MCs) are synthesized using a two-phase liquid-liquid immiscible method. In order to unravel the bright green photoluminescence (PL) mechanism for in-situ Cs 4 PbBr 6 MCs, the thermal stability of PL spectra for the supernatant and precipitate of reactants is investigated comparatively. Exciton binding energy, exciton-phonon (EP) coefficient and PL lifetime all indicate that the PL of the precipitate has similar temperature dependence as that of the supernatant. It is found that, according to its structural and optical characteristics , the supernatant of the reactants is CsPbBr 3 nanocrystals (NCs). We also find that the bright green PL from the precipitate of the reactants is due to CsPbBr 3 NCs embedded into Cs 4 PbBr 6 MCs. Experimental results further reveal the size of CsPbBr 3 NCs embedded into Cs 4 PbBr 6 MCs is larger than that of CsPbBr 3 NCs in the supernatant. The surface passivation of the composites can thus help to suppress the thermal quenching of PL for CsPbBr 3 NCs, which opens a new avenue for enhancing the thermal stability of PL for perovskite NCs.
研究领域:
材料科学
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光学
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PubMed
高影响因子
RSC Advances
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2022
·Vol. 12
·期 5
·2729-2735
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IF 4.036
Jie Zhang,Jiaojiao Liu
In this study, CsPbBr3 particles were prepared by a simple solvent evaporation method in ambient environment; the p–n heterojunction formed by CsPbBr3 particles on the surface of a single long Te wire was used to construct a high-performance Te/CsPbBr3 photodetector. Compared with CsPbBr3 PDs, the Te/CsPbBr3 photodetector showed improved photocurrent, and exhibited characteristics of excellent self-powered performance, broad-spectrum response (UV-visible), and ultra-fast response speed (trise = 0.09 ms). In addition, under zero bias and upon 540 nm light irradiation, the device had good responsivity (0.35 mA W−1), high photosensitivity (up to 100 on/off ratio), and a detectivity of 1.42 × 1010 Jones. This study provides insight into the possibility of manufacturing high-performance self-powered photodetectors through a simple in situ construction of heterojunctions.
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
Photonics
·
2023
·Vol. 10
·期 10
·1113
·
IF 2.4
Junhu Cai,Xiaogang Chen,Wenyan Zhang,Longwen Yang,Zexi Lin,Wenxiao Zhao,Yun Ye,Sheng Xu,Tailiang Guo,Enguo Chen
Owing to their composition-tunable and narrow emissions and high photoluminescence quantum yield (PLQY), inorganic halide perovskite quantum dots (IPQDs) are a promising option for wide color gamut displays. However, their practical applications have been limited by their lattice structure instability and surface defect states. Herein, CsPbBr3:KBF4@SiO2with improved stability and optical properties is successfully synthesized with a two-step optimization of fluorine (F) anion doping and SiO2in situ coating. Compared with bromide (Br), higher electronegativity and a smaller radius of F lead to stronger binding energy with Pb2+. Also, F anions can occupy surface Br vacancies. Then, benefiting from the acidic environment provided by BF4−hydrolysis, tetraethyl orthosilicate (TEOS) can be more easily hydrolyzed on the CsPbBr3:KBF4surface to generate SiO2coating, thus further passivating lattice defects and improving environmental stability. Importantly, the PLQY of CsPbBr3:KBF4@SiO2achieves 85%, and the stability has been greatly improved compared with pure CsPbBr3. Finally, CsPbBr3:KBF4@SiO2/PDMS, CsPbI3/PDMS, and CsPbCl3/PDMS composites with narrow emissions are applied to replace traditional phosphors as color converters for direct-view light-emitting diode (LED) displays or liquid crystal display (LCD) backlights. The color gamut reaches 118.22% under the NTSC standard. Concerning the display field, it suggests likely applications in the future.Keywords:CsPbBr3;KBF4;SiO2;wide color gamut;liquid crystal displays;LED displays
研究领域:
材料科学
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光学工程
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高影响因子
Nano Research
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2018
·Vol. 11
·期 3
·1447-1455
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IF 7.994
Cai Zhixiong,Li Feiming,Xu Wei,Xia Shujun,Zeng Jingbin,He Shaogui,Chen Xi
Perovskite nanocrystals (NCs), which have emerged as a new class of phosphors with superb luminescence properties and bandgaps that can be easily tuned using chemical methods, have generated tremendous interest for a wide variety of applications where colloidal quantum dots have been very successful as carrier sources. In this study, self-assembled films of CsPbBr 3 NCs were produced via drop casting of colloidal NCs onto glassy carbon electrodes (GCEs) to form an NC film-modified electrode. The possible fabrication process of the CsPbBr 3 NCs films was discussed. We further studied the anodic electrochemiluminescence (ECL) behavior of the perovskite CsPbBr 3 NCs film using cyclic voltammetry with tripropylamine (TPA) as a coreactant, and a possible ECL mechanism was proposed. Briefly, TPA was oxidized to produce strongly reducing radical species, which can react with electrochemically oxidized CsPbBr 3 NCs to generate excited CsPbBr 3 NCs* capable of light emission. The relative stability of the ECL emission of the CsPbBr 3 NC films under aqueous conditions was also investigated, and it was found that they showed operational stability over the first three hours, indicating suitable reliability for application as sensing materials. The results suggested that semiconducting perovskite NCs have great potential for application in the ECL field.
研究领域:
材料科学
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电化学
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DOI
高影响因子
JOURNAL OF POWER SOURCES
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2019
·
IF 7.467
Yuanyuan Zhao,Hongzhe Xu,Yudi Wang,Xiya Yang,Jialong Duan,Qunwei Tang
Inorganic cesium lead bromide (CsPbBr 3 ) perovskite solar cells (PSCs) have superior moisture- and thermal-stability in comparison with organic-specie or/and I-containing devices. However, the narrow-spectra absorption (<550 nm) arising from their large bandgap of 2.3 eV for CsPbBr 3 halide has markedly limited the further efficiency enhancement of corresponding inorganic device, therefore a great challenge is to broaden the light response range without sacrificing environmental tolerances. In this work, we constructively fabricate a CsPbBr 3 /bulk-heterojunction (organic J 61 -ITIC) photoactive layer to widen the optical absorption range of inorganic CsPbBr 3 based interlayer-free device. Arising from the broadened light response wavelength from 550 to 780 nm and precisely optimized crystal lattice by incorporating Rb + into CsPbBr 3 film, the optimal device achieves a power conversion efficiency up to 10.34% under one sun illumination . Upon persistent attacks by heat of 80 °C (0% humidity) or 90% humidity (25 °C) over 40 days, the solar cell can still remain approximately 96% of initial efficiency, demonstrating the excellent stability for practical application.
研究领域:
材料科学
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能源技术
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光伏器件研究
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DOI
高影响因子
Journal of Materials Chemistry C
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2019
·Vol. 7
·期 35
·10783-10788
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IF 6.641
Wenqiang Liu,Guodong Yuan,Yang Zhang,Qi Wang,Shuai Zhao,Zhiqiang Liu,Tongbo Wei,Junxi Wang,Jinmin Li
All-inorganic perovskite nanocrystals (NCs) have recently emerged as a new class of materials due to their tunable bandgaps and high photoluminescence quantum yields (PLQYs). The origin of the enhancement of PLQY of CsPbBr3 NCs is usually attributed to the efficient passivation of the surface halide vacancies creating nonradiative recombination sites. In this work, Br-rich CsPbBr3 NCs with a PLQY of 97% were prepared using an extreme excess of Br source with Br/Pb of 4.5/1 from the ligand itself at room temperature. Br-rich CsPbBr3 NC based light-emitting devices were fabricated under ambient conditions, exhibiting the maximum current efficiency of 1 cd A−1 at the luminance of 750 cd m−2. First principles calculations indicate that Br interstitials can form the strong localized states. Such localized effect can prevent photogenerated carriers from defusing to non-radiative recombination centers, thus being responsible for the high emission efficiency.
研究领域:
材料科学
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纳米技术
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光电
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DOI
高影响因子
Crystals
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2021
·Vol. 11
·期 11
·1287
·
IF 2.589
Yue Han,Rong Wen,Feng Zhang,Linlin Shi,Wenyan Wang,Ting Ji,Guohui Li,Yuying Hao,Lin Feng,Yanxia Cui
High-quality, all-inorganic CsPbBr3/Cs4PbBr6composite perovskite nanocrystals (NCs) were obtained with all-solution-processing at room temperature, and a photodetector (PD) with high detectivity was realized based on CsPbBr3/Cs4PbBr6NCs. The detectivity (D*) of the proposed PD is 4.24 × 1012Jones under 532 nm illumination, which is among the highest levels for PDs based on all-inorganic perovskite NCs. In addition, a high linear dynamic range (LDR) of 115 dB under 1 V bias was also realized. Furthermore, the underlying mechanism for the enhanced performance of the proposed PD was discussed. Our work might promote the preparation of high-performance PDs based on dual-phase all-inorganic perovskite nanocrystals.Keywords:all-inorganic lead halide perovskite;CsPbBr3;Cs4PbBr6;perovskite nanocrystals;photodetector
研究领域:
材料科学
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光电子学
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DOI
高影响因子
ACS Applied Electronic Materials
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2023
·
IF 4.7
Xiaoting Liu,Wenya Chen,Jiapeng Yang,Xiaojuan Liang,Xiaoli Fang,Weidong Xiang
As we all know, the various excellent properties of perovskite nanocrystals (NCs) have attracted attention in recent years. However, thei work stability is still the bottleneck to be solved urgently in their commercialization process. In this study, we encapsulated CsPbBr3 quantum dots in nano-SiO2 (inorganic) by a high-temperature sintering method and investigated the changes in optical stability before and after encapsulation. The SiO2 shell can effectively suppress anion exchange and photodegradation, which greatly improves the photothermal stability of shell NCs. Preparation of composite films by mixing CsPbBr3–SiO2 (inorganic) and polymer material PMMA (organic) by a solvent solution method can further enhance its stability. Meanwhile, the backlight display device realized the practical application of CsPbBr3–SiO2/CsPbBr1.2I1.8@PMMA with a wide color gamut (112% of the NTSC, 84% of the Rec. 2020). This is a very significant step to open up the awkward situation of the practical application of perovskite NC materials in backlight displays.
研究领域:
材料科学
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光电技术
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显示技术
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高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Yongfei Hu,Shefiu Kareem,Hao Dong,Wei Xiong,Shouqin Tian,Javad Shamsi,Ling Li,Xiujian Zhao,Yi Xie
Lead halide perovskite nanocrystals are extremely promising for photoelectronic application. However, maximizing their stability toward water, UV irradiation, or heat is yet a great challenge for the commercialization process. Herein, we develop a novel and facile surface functionalization approach that combined coating by the SiO2 layer with surface modification by intrinsically hydrophobic methyl groups for the fabrication of superhydrophobic SiO2-coated CsPbBr3 (referred as SH-CsPbBr3@SiO2) nanoparticle films. The SiO2 coating is realized by the hydrolysis of tetramethyl orthosilicate in the presence of ammonia. Hexamethyldisilazane is introduced for nanoparticle surface modification and thus offers the nanoparticle films’ superhydrophobic performances. By optimizing the surface coating and modification, the static water contact angle and sliding angle on the representative SH-CsPbBr3@SiO2 core–shell nanoparticle film can reach 160 and 3°, respectively. As a synergetic contribution from SiO2 coating and modification by methyl groups, the as-fabricated green-emissive SH-CsPbBr3@SiO2 films exhibit excellent water repellency, self-cleaning, and ultrahigh stability toward water, heat, and UV illumination. It is of great interest that the photoluminescence (PL) intensity of the SH-CsPbBr3@SiO2 sample increases by 46% after 180 days under ambient conditions due to the phase transformation from CsPbBr3 to CsPb2Br5 and Pb(OH)Br. The resulting CsPb2Br5-based luminescent film shows excellent aqueous stability with remaining 75% of its initial PL intensity after soaking in water for 10 days. The white-light-emitting diode device fabricated using the green-emissive nanoparticles reports more than 20% external quantum efficiency (EQE), and no noticeable decrease in EQE is observed even after 2 weeks. This work elucidates a facile surface engineering strategy to prepare luminescent films with ultrahigh stability.
研究领域:
材料科学
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表面化学
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光学
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DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
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2022
·Vol. 24
·期 14
·8303-8310
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IF 3.945
Ruirui Wu,Shunfa Gong,Lifang Wu,Hailong Yu,Qiuju Han,Wenzhi Wu
Benefiting from the easily adjustable optical properties of perovskite, CsPbBr3 nanocrystals (NCs) are considered to show their advantages in the field of display. Here, we report that a selective laser irradiation is used to induce CsPbBr3 nanostructural reshaping and then yielding a morphological change. Under 360 or 405 nm laser irradiation, a hierarchical crystal growth process occurs for the fabricated CsPbBr3 nanoplatelets (NPLs), which are first arranged in a side-by-side manner and reshaped into nanorods (NRs), and then NRs are arranged in the face-to-face manner to reshape into NCs. The entire process is monitored optically and microscopically, which showed that crystal growth relies on seeking a dynamic balance between heat dissipation and accumulation under laser irradiation. The heat on NPLs generated by laser irradiation dissipated with a low dissipation rate and thus led to temperature rising and lattice breaking, which turned out to be the driving force for the crystal growth in CsPbBr3 NPLs. This feasible laser irradiation-assisted method provides for crystal growth a reliable and scalable route toward the preparation of perovskite functional materials.
研究领域:
材料科学
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光学
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纳米技术
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DOI
PubMed
高影响因子
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