CHEMISTRY OF MATERIALS
·
2018
·
IF 9.89
Jinyuan Zhao,Sunan Cao,Zhi Li,Nan Ma
Metal halide perovskites (MHPs) have recently attracted considerable attentions due to their remarkable optoelectronic properties. Colloidal synthesis of MHPs provides a versatile route to precisely control their dimensionality and the related optoelectronic properties. Herein, we report on amino acid (Trp)-mediated synthesis of quasi-two-dimensional CsPbBr3 perovskite nanoplatelets (NPLs) with well-controlled and tunable thickness. The number of layers (n) could be finely tuned from 4 to 12 by simply adjusting Trp concentration, leading to gradual red shift of their photoluminescence (PL). This allows us to directly correlate their thickness with the band gap energy in the quantum confinement regime, which is in good agreement with theoretical model. We found that Trp is the only hydrophobic amino acid to promote the formation of 2D CsPbBr3 NPLs. The use of Trp derivatives for CsPbBr3 nanocrystal synthesis indicates that the carboxyl group, amine group, and indole ring of Trp act synergistically on CsPbBr3 NPL formation.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yifan Zhou,Zhiliang Deng,Bing Wang,Pei Li,Lingxi Li,Wenmin Han,Jie Huang,Wenbao Jia,Xiaoping Ouyang,Qiang Xu,Kostya (Ken) Ostrikov
Nanocrystalline scintillators with low-cost, fast response, and high light yield are widely used for X-ray imaging. However, they fail in high-energy X-ray imaging because of the fundamental limitations due to lateral radiation spreading in thicker device-compatible active layers. This issue is resolved by using the novel nanocomposite containing CsPbBr 3 scintillation single-microcrystalites embedded into transparent, natural wood-derived light-guiding fibrous structures. The CsPbBr 3 crystals convert X-ray to visible photons with a high photoluminescence quantum efficiency (76 %), and an average fast photoluminescence decay time of 25.9 ns. The delignified wood-derived fiber-like lumina effectively guide light, while suppressing the lateral spreading of scintillation photons. This unique porous nanocomposite material offers an excellent X-ray detection performance, and linear response in a wide parameter range. The developed scintillator screen achieves well-resolved, high-contrast X-ray imaging, featuring a very high spatial resolution of 11.9 lp/mm at a modulation transfer function of 0.2, thus exceeding the benchmark industry standards and offering a new advanced materials platform for radiation detection and dosimetry applications.
研究领域:
材料科学
·
医学影像
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Journal of Materials Chemistry B
·
2019
·Vol. 7
·期 26
·4153-4160
·
IF 5.047
Qi-Bao Yan,Ning Bao,Shou-Nian Ding
The poor stability of fully inorganic halide perovskite nanocrystals (PNCs) has always restricted their wider application, especially in cell imaging. It has attracted more and more attention to use ligand engineering to improve the stability of PNCs. In this work, CsPbBr3/mPEG-NH2 NCs were synthesized using a highly biocompatible functional polymer, methoxypolyethylene glycol amine, as the capping ligand. The as-prepared CsPbBr3/mPEG-NH2 NCs exhibited superior water solubility as a result of the hydrophilic properties of mPEG-NH2. More shockingly, a significantly enhanced fluorescence intensity was found when CsPbBr3/mPEG-NH2 NCs were dispersed in water for a period of time. Correspondingly, the fluorescence quantum yield increased from the initial 16% to 41% a week later. Meanwhile, the thermal stability of the product has been greatly improved; about 80% of the initial PL intensity was still maintained after heating the product to 100 °C. Finally, we directly utilized the CsPbBr3/mPEG-NH2 NCs as luminescent probes for cell imaging for the first time.
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2026
·
IF 5.9
Zhifei Zhou,Chao Huang,Zhiwei Xiang,Yuanzheng Yang,Yanxue Wu,Weitong Cai
CsPbBr 3 perovskite solar cells (PSCs) have attracted increasing attention due to their superior thermal and environmental stability; however, their power conversion efficiency (PCE) remains limited by uncontrolled crystallization and high defect density during solution processing. Meanwhile, the widespread use of toxic antisolvents and the limited effectiveness of single control strategies necessitate the development of greener and more effective fabrication methods. To address these issues, this study introduces a green mixed antisolvent by incorporating isopropanol (IPA) into ethyl acetate (EA), coupled with a three-step spin-coating process for the deposition of CsPbBr 3 films. By adjusting the volume fraction of IPA in the mixed antisolvent, the crystallization of CsPbBr 3 films was effectively regulated, resulting in dense, uniform films with low defect density. At an optimal IPA volume fraction of 10%, dense and hole-free CsPbBr 3 films were obtained with markedly suppressed non-radiative recombination. As a result, the corresponding CsPbBr 3 PSCs exhibited a significantly enhanced PCE of 8.15%, compared with 5.63% for devices processed using pure EA. Moreover, the optimized device retained 97.9% of its initial efficiency after 30 days of storage under ambient conditions without encapsulation. This work provides a practical solution for fabricating effective and environmentally friendly inorganic perovskite photovoltaic devices.
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高影响因子
MICROCHEMICAL JOURNAL
·
2026
·
IF 5.1
Penghao Zhu,Guang Zheng,Kaili Gao,Duoxia Xu,Xiaohua Nie,Yuanchao Lu,Guijie Hao,Xianghe Meng
Size and shape critically influence the optical properties of CsPbBr 3 NCs, but lack sufficient research in sensing. Herein, particle sizes and shapes of CsPbBr 3 NCs were precisely adjusted by room-temperature synthesis method, and sensing performances to peroxide value (PV) of edible oils were investigated. The results found that the particle sizes (4.3 ± 0.2, 6.3 ± 0.2, 8.8 ± 0.3, and 12.9 ± 0.6 nm) of high-crystallized cubic CsPbBr 3 NCs were precisely obtained, and the fluorescence (from 491 to 516 nm) and absorption (from 470 to 526 nm) peak wavelengths redshifted as the particle size increased from 4.3 nm to 12.9 nm. Among four particle sizes, CsPbBr 3 NCs (8.8 nm) demonstrated the optimal sensing performance (wavelength-shifted colorimetric method R 2 = 0.99) for PV detection, achieving a linear response range of 0.02–0.36 g/100 g with LOD of 0.0022 g/100 g and LOQ of 0.0073 g/100 g. Considering the interference from trace moisture in edible oil, a moisture-compensated intensity-quenched colorimetric method was proposed to improve the practical accuracy, with the practical recovery rates from 95%–245% to 90%–119%. Therefore, the proposed methods had good sensitivity, accuracy and practicability, and enlightened the effective technologies for the quality detection of edible oil.
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高影响因子
Nanoscale
·
2019
·Vol. 12
·期 4
·2569-2577
·
IF 6.97
Aijing Gao,Jia Yan,Zhaojin Wang,Pai Liu,Dan Wu,Xiaobing Tang,Fan Fang,Shihao Ding,Xiang Li,Jiayun Sun,Meijuan Cao,Liduo Wang,Luhai Li,Kai Wang,Xiao Wei Sun
Printable perovskite quantum dot (QD) ink is very important for achieving high quality coffee ring-free fluorescent microarrays for different kinds of emerging perovskite optoelectronic applications using inkjet printing. In this work, we prepared a printable CsPbBr3 perovskite QD ink by mixing high-boiling point dodecane with low-boiling point toluene as a solvent. The evaporation rate, viscosity and surface tension of the ink were carefully optimized by tuning the volume ratio of these two solvents for forming appropriate Marangoni flow, so as to balance the capillary flow and eliminate the coffee ring effect further. Successfully, CsPbBr3 perovskite microarrays with uniform surface, low roughness and no coffee rings were achieved by inkjet printing the optimized perovskite QD ink on a PVK (poly-(9-vinylcarbazole)) layer. Furthermore, we patterned the CsPbBr3 perovskite QD ink, and the printed patterns were only visible under ultraviolet (UV) light, which can be applied in invisible anti-counterfeiting labels and encryption in the future.
研究领域:
材料科学
·
光学工程
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Science China-Materials
·
2020
·Vol. 64
·期 4
·798-807
·
IF 6.098
Du Jian,Duan Jialong,Duan Yanyan,Tang Qunwei
All-inorganic CsPbBr 3 perovskite solar cells (PSCs) are promising candidates to balance the stability and efficiency issues of organic-inorganic hybrid devices. However, the large energy barrier for charge transfer and narrow spectral response are still two challenging problems for performance improvement. We present here an organic bulk-heterojunction {poly(3-hexylthiophene-2,5-diyl):[6,6]-phenyl C61 butyric acid methyl ester (P3HT: PCBM)} photoactive layer to boost the charge extraction and to widen the spectral absorption, achieving an enhanced power conversion efficiency up to 8.94% by optimizing the thickness of P3HT: PCBM photoactive layer, which is much higher than 6.28% for the pristine CsPbBr 3 device. The interaction between the carbonyl group in PCBM and unsaturated Pb atom in the perovskite surface can effectively passivate the defects and reduce charge recombination. Furthermore, the coupling effect between PCBM and P3HT widens the spectral response from 540 to 650 nm for an increased short-circuit current density. More importantly, the devices are relatively stable over 75 days upon persistent attack by 70% relative humidity in air condition. These advantages of high efficiency, excellent long-term stability, cost-effectiveness and scalability may promote the commercialization of inorganic PSCs.
研究领域:
光伏技术
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材料科学
·
钙钛矿太阳能电池
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有机电子学
·
可再生能源
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Haiwen Yuan,Yuanyuan Zhao,Jialong Duan,Benlin He,Zhengbo Jiao,Qunwei Tang
Perovskite-structured CsPbBr 3 halide is an emerging light-harvester for all-inorganic solar cells due to its superior stability against moisture and heat. However, the wide bandgap of CsPbBr 3 (2.3 eV) calls for serious charge recombination and low efficiency in its photovoltaics . We present here all-inorganic CsPbBr 3 perovskite solar cells (PSCs) by modifying TiO 2 /CsPbBr 3 and CsPbBr 3 /carbon interfaces with carbon quantum dots (CQDs) and phosphorus quantum dots (PQDs), respectively. The electron and hole extractions are markedly enhanced by setting intermediate energy levels, and the optimized PSC achieves a power conversion efficiency of 7.93% in comparison with 6.05% for the device free of CQDs and PQDs. Moreover, the unsealed PSCs are highlighted by long-term stability in high humidity over 1400 h. This work may provide new opportunities of promoting charge extraction at CsPbBr 3 /charge-transporting material interfaces .
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Ying Liu,Bingfeng Shi,Qian Liu,Changli Lü
All-inorganic perovskite quantum dots (PQDs) have received great attention in the field of optoelectronics because of their excellent optical properties . However, the application of perovskite is always limited because of its poor stability. Herein, the CsPbBr 3 PQDs were stabilized by two-dimensional (2D) nanosheets of layered double hydroxide (LDH) for the first time using a simple one-pot in-situ growth route. In the as-synthesized LDH/CsPbBr 3 nanocomposite, CsPbBr 3 PQDs are uniformly attached to the surface of the LDH nanosheets . The resulted composite powder showed good green-luminescence, high solid PLQY (∼41%), narrower FWHM (∼20.0 nm), long fluorescence lifetime, excellent humidity stability and photostability. The unique 2D structured LDH nanosheets imparts significantly enhanced stability to LDH/CsPbBr 3 composite. All these advantageous properties make the LDH-based fluorescent composite good candidate for flat-panel displays and lighting devices. Our research proposes a novel method to stabilize PQDs by using inorganic 2D nanosheet materials and provides new opportunities for the applications of perovskite in optoelectronic field such as white light-emitting diode (LED).
研究领域:
材料科学
·
纳米技术
·
光电子学
·
钙钛矿量子点
·
固态照明
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高影响因子
Materials
·
2019
·Vol. 12
·期 8
·1215
·
IF 2.972
Xu Zhang,Qing Li,Shikai Yan,Wei Lei,Jing Chen,Khan Qasim
Taking advantage of a large light absorption coefficient, long charge carrier diffusion length and low-cost solution processing, all-inorganic halides perovskite CsPbBr3quantum dots (QDs) are combined with a ZnO QD film to construct a high-performance photodetector. In this work, a novel photodetector device based on transistor structure with dual active layers composed of CsPbBr3and ZnO film is proposed. In this structure, CsPbBr3film functions as the light-absorbing layer and ZnO film acts as the conducting layer. Owing to the high electron mobility and hole-blocking nature of the ZnO QDs film, the photo-induced electron-hole pairs can be separated efficiently. As a result, the device exhibits high performance with response of 43.5 A/W, high detection up to 5.02 × 1011Jones and on/off ratio of 5.6 × 104under 365 nm light illumination. Compared with the ZnO-only phototransistor (the photodetector with the structure of transistor) the performance of the CsPbBr3phototransistor showed significant improvement, which is superior to the majority of photodetectors prepared by perovskite. This work demonstrates that the ZnO QDs film can be applied in the photodetector device as a functional conducting layer, and we believe that the hybrid CsPbBr3/ZnO phototransistor would promote the development of low-cost and high-performance photodetectors.
研究领域:
光电子学
·
纳米材料
·
半导体器件
·
光电探测器
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DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2023
·
IF 5.4
Yusheng Song,Xi Yuan,Ke Xing,Sheng Cao,Jinju Zheng,Bingsuo Zou,Jialong Zhao
Improving the photoluminescence quantum yields (PL QYs) and stability of blue-emitting CsPbBr 3 nanoplatelets (NPLs) is essential for the application in high-quality displays. Herein, highly luminescent CsPbBr 3 NPLs with PL peak at 462 nm were prepared by a modified supersaturated recrystallization synthesis strategy at room temperature. The resulting blue CsPbBr 3 NPLs show high PL QY of 98% and a full width at half maximum of 13 nm, benefiting from the decyl disulfide (DF) surface treatment. Besides, the DF-treated CsPbBr 3 NPLs show lower Urbach energy (15 meV) and more outstanding water, acetone, and UV-light resistance stabilities than the pristine ones, suggesting that the surface ligand treatment can reduce Br − vacancy defects and inhibit the non-radiative recombination process. Based on the temperature-dependent PL, the exciton binding energy of CsPbBr 3 NPLs is found to increase from 109 to 201 meV after DF treatment. Finally, light-emitting diodes based on the treated CsPbBr 3 NPLs were fabricated.
研究领域:
材料科学
·
光学工程
·
化学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Zhanpeng Wang,Tonghua Hu,Peng Yang,Jian Huang,Luyang Hou,Yichi Zhong,Hongyu Yang,Jian Xiong,Jingzhou Li,Hongxing Dong,Long Zhang
The spatial distribution characteristic of the superlattices sizes on the assembly substrates was revealed. • A kinetic regulation strategy was proposed to achieve CsPbBr 3 superlattice size tunable. • The superlattices fabricated via our method host the capability of ultra-fast superfluorescence emission. Superfluorescence in self-assembled CsPbBr 3 superlattices of colloidal quantum dots (QDs) has garnered extensive attention due to its ultra-fast, intense burst emission. Among the available fabrication methods for superlattices, saturated solvent evaporation remains widely utilized for its operational simplicity and cost-effectiveness. However, this conventional method exhibits poor controllability and process randomness owing to the absence of a stable preparation platform, thereby hindering controlled self-assembly. Here, a high-temperature (30–70 °C) saturated solvent evaporation method was developed for size-tunable and efficient preparation of high-quality CsPbBr 3 superlattices. In this approach, the coffee-ring effect governs assembly by driving solute transport, inducing a distinct spatial gradient where superlattice size decreases from the substrate edge to center. Systematic modulation of assembly temperature and QD concentration enables adjustability of superlattice dimensions. Specifically, higher temperatures attenuate solute migration, thereby reducing superlattice size, while increased QD concentration strengthens inter-dot interactions to promote the formation of larger superlattices. A near-100-fold radiative acceleration of the prepared superlattices compared to conventional QD films demonstrates the ultrafast superfluorescence emission capability. Combined with their potential for scalable production, a material foundation was provided for ultrafast photonic applications. And it also opens up a reliable pathway for superlattice fabrication, laying a foundation for future size-dependent superlattice research and the development of high-performance optoelectronic devices. Download: Download high-res image (151KB) Download: Download full-size image
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