CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Yang Liu,Yuelei Li,Xudong Hu,Changting Wei,Bo Xu,Jing Leng,Haibo Miao,Haibo Zeng,Xiaoming Li
Surface ligands play important roles in synthesis, surface passivation, colloidal stability, and modulation of optoelectronic properties for quantum dots (QDs). It is well known that conventional ligands exhibit weak binding on the surface of perovskite QDs (PQDs), resulting in uncontrolled growth and unsatisfied stability during purification and operation. This impedes the device performance progress and practical applications severely. Stronger ligands anchoring on PQDs tightly and passivating surface defects efficiently have been reported to solve the problems. Herein, we choose a representative strong ligand, dodecylbenzene sulfonic acid (DBSA), to investigate its influence on PQD growth, stability under high-temperature with various solvents and additives, and the possibility of core–shell structure construction. Interestingly, the DBSA capped PQDs exhibit abnormally ripening under above conditions. Besides, a new mechanism for ion migration suppression is proposed based on internal lattice relaxation and inter-particle migration pathway elimination. Although DBSA-PQDs can be purified several times and maintain a high quantum yield, the corresponding light-emitting diodes show poor external quantum efficiency, which might be assigned to the unbalanced colloidal stability and film conductivity. This work indicates that strong ligands provide wider space for PQD modulation and the balance between stability and device performance should also be considered.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Jingjing Liu,Yu Peng,Bicheng Zhu,Youji Li,Liuyang Zhang,Jiaguo Yu
Triethylamine , as a typical gas of volatile organic compounds, is a growing threat to human health due to its extensive applications in industry. In this study, ZIF-8 derived ZnO polyhedrons are decorated by CsPbBr 3 quantum dots via electrostatic adsorption. Then a highly sensitive sensor towards triethylamine based on ZnO-CsPbBr 3 composite is successfully fabricated. Compared with sensors based on pristine ZnO and ZnO (nanoparticles)-CsPbBr 3 , ZnO-CsPbBr 3 displays a higher response value (~ 60 towards 100 ppm of TEA), shorter response/recovery time (2/18 s), and lower detection limit (5 ppb). Thus, highly-sensitive detection and efficiently-catalytic oxidation of trimethylamine can be achieved. Such distinguished performance can be ascribed to its unique architecture and n-n heterojunction . Notably, the sensing mechanism is thoroughly interpreted by X-ray photoelectron spectroscopy, temperature programmed desorption of O 2 and in-situ diffuse scattering Fourier transform infrared spectra.
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JOURNAL OF SOLID STATE CHEMISTRY
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2022
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IF 3.656
Yuqing Cao,Yabin Shao,Jing Zhang,Chen Chen,Qiang Wang
The lead halide perovskite (LHP) semiconductor material has many outstanding advantages and was widely used light-emitting device, however their low stability severely limited the practical application and further commercialization. We proposed a two-step method for synthesizing CsPbBr 3 /SiO 2 composites to improve the stability of CsPbBr 3 perovskite nanocrystals (PNCs). The synthesized CsPbBr 3 /SiO 2 composites can maintain photothermal stability, and also have a narrower photoluminescence (PL) bandwidth of 20.2 ± 0.26 nm, and the PL peak (518 nm) hardly shifted during the two-step synthesizing process. Through the temperature-dependent PL spectroscopy, we show that the CsPbBr 3 /SiO 2 composites have a high exciton binding energy 50.0 meV and longitudinal optical phonon energy 80.1 meV, suggesting that the robust excitons exist in CsPbBr 3 /SiO 2 composites. The improved stability of the composites is demonstrated by exposure to harsh environments such as laser irradiation, heating and water. These findings are greatly significant for further applications of CsPbBr 3 PNCs in optoelectronic devices.
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INORGANIC CHEMISTRY
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2022
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IF 5.436
Wei Shen,Liu Yang,Jingting Feng,Yanfeng Chen,Wei Wang,Jianbin Zhang,Lihui Liu,Kun Cao,Shufen Chen
Generally, solvents used to synthesize perovskite NCs are toxic, which leads to waste liquid pollution and environmental degradation. Herein, we developed a novel environmentally friendly polar solvent method to synthesize CsPbBr3 nanocrystals (NCs). Over 65% photoluminescence quantum yield (PLQYs) for NCs could be maintained over 45–850 h of storage time, and a maximum was 78% at 750 h. Such amazing stability in polar solvents is dominated by a ripening process, which heals surface defects. Additionally, their solid films also exhibited good moisture stability. Furthermore, CsPbBr3 NCs were applied to inkjet-printing to prepare high-quality patterned films.
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PubMed
高影响因子
Advanced Photonics Research
·
2021
·Vol. 3
·期 1
·2100250
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IF 0
Xue-Chen Ru,Ji-Song Yao,Jun-Nan Yang,Jing Ge,Yi-Feng Lan,Tian Chen,Zhen-Yu Ma,Yi-Chen Yin,Jing-Jing Wang,Yong-Hui Song,Li-Zhe Feng,Kuang-Hui Song,Hong-Bin Yao
All-inorganic cesium lead halide perovskite colloidal nanocrystals (NCs) (CsPbX 3 , X = Cl, Br, I) have emerged as potential candidates for next-generation light-emitting diodes (LEDs). However, high trap states on the surface of CsPbX 3 NCs caused by ionic nature and dynamic bonding of organic ligands limit the performance of CsPbX 3 NCs-based LEDs. Herein, a microemulsion (ME)-modified strategy to decorate CsPbBr 3 NC cores with inorganic PbWO 4 is developed. It is demonstrated that ME-assisted modification plays a crucial role in bridging the WO 4 2− anion solution and the CsPbBr 3 NC suspension. Compared with pristine CsPbBr 3 NCs, the obtained PbWO 4 -modified NCs exhibit improved photoluminescence efficiency. The corresponding NC films also show enhanced stability at elevated temperature and also in humid atmosphere. Consequently, the PbWO 4 -modified NCs-based LED exhibits a pronounced improvement of electroluminescence with an external quantum efficiency from 0.2% to 5.7% and twofold enhancement of the operational lifetime through PbWO 4 passivation in comparison with that of pristine CsPbBr 3 NCs-based LED. These results show a promising pathway by ME-induced anionic modification for high-performance and stable LEDs based on perovskite NCs.
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Crystals
·
2021
·Vol. 11
·期 11
·1287
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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
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高影响因子
Journal of Physical Chemistry C
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2021
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IF 4.126
Meng Li,Xiao Zhang,Peng Wang,Ping Yang
Research on anion exchange reactions (AERs) indicated that the reaction rate has a significant influence on the photoluminescence properties and crystal structures of the resulting CsPb(Br/I)3 nanocrystals (NCs). Controllable AERs were achieved by controlling the reaction rate. Using controllable AERs, metastable γ-CsPbI3 NCs were directly obtained from the aged orthorhombic CsPbBr3 NCs. Rietveld refinement indicated that the crystal structure of parent CsPbBr3 was maintained without any phase transition or degradation. The prepared γ-CsPbI3 NCs exhibited good stability at room temperature. X-ray photoelectron spectroscopy analysis demonstrated the presence of Br and the high binding energy of Pb–Br bonding. Pb–Br bonds maintained the parent orthorhombic CsPbBr3 structure and increased the stability of γ-CsPbI3 NCs. Controllable AERs provide versatile methods to maintain the parent perovskite structure and synthesize CsPbI3 NCs with a more rigid crystal structure. They pave the way for the preparation of NCs, which are difficult to synthesize directly.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 45
·期 2
·930-938
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IF 3.288
Pengyin Deng,Wei Wang,Xiqing Liu,Liang Wang,Yongsheng Yan
The detection of o-nitrophenol in the environment is of great significance to environmental protection. In this paper, the fluorescence sensor of CsPbBr3@SHFW was synthesized by an ultrasonic assisted method using perovskite quantum dots as the fluorescence source and a super hydrophobic porous organic polymer framework (SHFW) as the protective layer. Then CsPbBr3@SHFW was used to detect o-nitrophenol in dichloromethane. Under the optimum conditions, the detection limit of CsPbBr3@SHFW was 7.69 × 10−3 μM, and the linear range was 0–280 μM. It was also proved that the fluorescence quenching of this work is electron transfer. This work provided help for the construction of a stable perovskite quantum dot sensor and the application of a perovskite quantum dot sensor in the field of fluorescence detection.
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JOURNAL OF LUMINESCENCE
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2021
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IF 3.599
Bowang Shu,Yajing Chang,Li Dong,Leilei Chen,Huijuan Wang,Supeng Yang,Jinhua Zhang,Xiaopeng Cheng,Dabin Yu
CsPbBr 3 perovskite quantum dots (PQDs) have drawn much attention for their high photoluminescence quantum yield and great potential in optoelectronic applications. However, they suffer from poor stability under humid condition. This paper reports CsPbBr 3 PQDs incorporated in aluminum stearate (AlSt 3 ) matrix via an improved co-precipitation approach, in which AlSt 3 not only acted as hydrophobic matrix to protect CsPbBr 3 PQDs from surrounding environment, but also passivated the surface of PQDs via the coordination bond of St-Cs and St-Pb, as well as bond between Al 3+ and Br − . By this method, the as-synthesized CsPbBr 3 -AlSt 3 composites exhibited excellent stability in ambient condition even directly in water for more than 60 days. With the CsPbBr 3 -AlSt 3 composites (green emission) used as color-conversion layer, a white light-emitting diode (WLED) was fabricated with a high color rendering index (Ra) of 90 and a low color temperature (Tc) of 4929 K. These results suggest that this method pave an effective way to stabilize CsPbBr 3 PQDs, which is of great importance for their further application.
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CHEMISTRY OF MATERIALS
·
2020
·
IF 9.567
Yixuan Liu,Dan Li,Lulu Zhang,Yujuan Chen,Chong Geng,Shuangshuang Shi,Zizhen Zhang,Wengang Bi,Shu Xu
Ligands binding to all-inorganic lead halide perovskite nanocrystals (IPNCs) are easy to detach from the surface through proton exchange, causing severe stability issues in practical applications. Here, we have reported an amine- and acid-free approach for the synthesis of CsPbBr3 IPNC with highly improved photochemical stability. The reaction mechanism follows a trioctylphosphine-mediated surface passivation route, which provides a proton-free reaction environment to stabilize the ligand capping on the surface of IPNCs. Nuclear magnetic resonance, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy characterizations reveal that the IPNCs possess a lead-rich surface passivated by carboxylates. The surface capping motif endows IPNCs with comprehensively improved stability against air, water, light, and heat. The IPNCs withstand exposure to ethanol in room light for 30 days and show nearly no fluorescent quenching. More importantly, the IPNCs present high resistance to intense light irradiation. Under continuous irradiation by 10 W/cm2 blue light in open air, the lifetime of the IPNCs reaches over 2000 h, catching up the photostability of CdSe QDs. The white LEDs based on the IPNCs display a wide color gamut of 122% NTSC and luminous efficacy of 71 lm/W.
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ACS Applied Nano Materials
·
2022
·
IF 6.14
Xue Zhang,Yang Zhou,Linwei Peng,Zhuohan Lin,Yiyang Chang,Zhangfeng Zhou,Yan Li
Quantum-confined CsPbBr3 nanoplatelets (NPLs) with narrow full width at half-maximum (FWHM), large exciton binding energies, and precisely tunable thickness have become one of the promising materials for lighting and display. Still, the synthesis of CsPbBr3 NPLs with high photoluminescence (PL) intensity and excellent stability is challenging, hindering their large-scale application in lighting devices. Herein, we present a facile post-treatment strategy to enhance the PL performance of CsPbBr3 NPLs by surface passivation with a ZnBr2 solution. The ZnBr2-treated CsPbBr3 NPLs exhibit 90% photoluminescence quantum yield (PLQY) in the dispersion at 461 nm and 50% PLQY in thin films. Benefiting from surface defect passivation and ion migration suppression, ZnBr2-treated CsPbBr3 NPLs exhibit outstanding stability over pristine CsPbBr3 NPLs during long-term storage and exposure to a polar solution, light, and heating treatment. Specifically, the PL intensity of ZnBr2-treated CsPbBr3 NPLs dispersion shows a little decrease after storage at ambient conditions for 50 days or after mixing with ethanol for 160 h. Under challenging conditions including exposure to ultraviolet light for 300 h or heating at 70 °C for 30 min, their PLQY decreases only slightly.
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ACS Applied Electronic Materials
·
2023
·
IF 4.7
Yubo Peng,Xudong Jin,Pingjun Zeng,Min Zhao,Zhipeng Gao,Jian-long Ji,Xiaona Li,Weiyi Chen
Recently, artificial photosynapses have attracted much attention from researchers because they have the ability to perceive, process, and remember information about the external environment, which can greatly improve the efficiency of visual information processing. This work prepared the artificial optical synaptic transistors based on organic electrochemical transistors (OECTs) and CsPbBr3 quantum dots (QDs) synthesized at room temperature. The fabricated device here could successfully imitate the visual functions by mimicking the important synaptic features such as excitatory postsynaptic currents, paired-pulse facilitation, spiking-rate-dependent plasticity, spiking-number-dependent plasticity, and short-term memory to long-term memory transition. Employing the device, we also simulated the capabilities of the human visual system of light adaptation, image recognition, and preprocessing. The investigations in this work indicated that CsPbBr3 QDs have a high potential application in fabricating artificial photosynapses of the type of OECTs to imitate human vision due to the simpler fabrication process.
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高影响因子
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