Catalysts
·
2023
·Vol. 13
·期 7
·1048
·
IF 3.9
Wanli Liu,Jinfeng Liu,Xiaoqian Wang,Jiazhen He,Yuqing Li,Yong Liu
Practical applications of CsPbX3nanocrystals (NCs) are limited by their poor stability. The formation of a heterojunction between CsPbX3NCs and oxides is an effective means to protect perovskite from polar solvents and other external factors. Significantly improving the stability and photocatalytic properties of the core/shell perovskite is very important for its application in photoelectric and photocatalytic technology. Here, we report the synthesis of asymmetrical CsPbBr3/TiO2core–shell heterostructure NCs at the single-particle level by hot-injection liquid-phase synthesis and sol–gel method, where each CsPbBr3NCs is partially covered by titanium dioxide. We tested not only the optical properties of the material but also the electrochemical impedance and photocurrent density of the material in sodium sulfate solution. It is shown that the type II arrangement is generated at the heterogeneous interface, which greatly facilitates the separation of electron–hole pairs and increases the carrier transport efficiency. Compared with CsPbBr3NCs, CsPbBr3/TiO2has higher photocatalytic efficiency. More crucially, due to the protection of the titanium dioxide shell, the product has higher long-term stability in humid air compared with bare CsPbBr3NCs. The asymmetrical core–shell heterostructure prepared in this study not only improves the stability of CsPbX3NCs but also provides some ideas for optoelectronic device applications and TiO2-based photocatalysts.
研究领域:
材料科学
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光电技术
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纳米科技
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产品关联
DOI
高影响因子
ORGANIC ELECTRONICS
·
2021
·
IF 3.721
Xiaowen Zhou,Yu Zhao,Wenzhe Huang,Yuanyuan Wu,Zhongen Wu,Gufeng He
Perovskite lighting-emitting diodes (PeLEDs) with inverted structure have been considered as promising display technology due to their suitable driving schemes with n-type thin-film transistors. However, the defects and imbalanced charge carriers in the CsPbBr 3 nanocrystal (NC) PeLED are key hurdles, limiting the performance. Herein, we have successfully doped Zn 2+ ions into CsPbBr 3 NCs by ligand-assisted reprecipitation method, exhibiting an 85% enhancement of the photoluminescence quantum yield (PLQY). In addition, the optimized energy level alignment via Zn doping facilitates the carrier balance in the devices, improving the efficiencies. The obtained CsPbBr 3 :Zn-based PeLED reaches a high luminance of 3124 cd/m 2 and a maximum external quantum efficiency (EQE) of 0.85%, which are superior to those of CsPbBr 3 -based PeLED (luminance = 564 cd/m 2 , EQE = 0.09%). The results demonstrate that Zn doping significantly enhances the performance of PeLED, which increases the potential of these inverted PeLEDs connected with n-type TFTs towards practical applications.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2024
·
IF 5.4
Shu Tang,Huiying Hao,Boyuan Yang,Wanfei Shi,Shindume Lomboleni Hamukwaya,Jingjing Dong,Jie Xing,Hao Liu
The emergence of CsPbBr3 perovskite solar cells (PSCs) with a band gap of approximately 2.3 eV has generated increasing interest stemming from their potential for high open-circuit voltage (Voc), making them particularly suitable for use in tandem configurations or spectral splitting. However, the Voc of PSCs currently falls short of its theoretical limit, driven by trap-mediated charge recombination and energy band alignment mismatch. In this study, we present a straightforward additive engineering approach involving the introduction of PbI2 species into the PbBr2 precursor film to form the I–Pb–Br interaction, retarding the rapid reaction between PbBr2 and CsBr. This approach effectively suppresses the Pb-rich phase CsPb2Br5, eliminates pinholes on the CsPbBr3 crystal, and obtains high-quality perovskite films, which can significantly enhance the photovoltaic properties. Consequently, we achieved CsPbBr3 films characterized by enlarged crystal size, complete coverage, high purity, and without pinhole presence, leading to a best-performed efficiency of 10.35% and a higher Voc of up to 1.580 V compared to the power conversion efficiency (PCE) of 8.35% and a Voc of 1.442 V of the control device, along with exceptional operational stability.
研究领域:
材料科学
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能源技术
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光伏研究
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 45
·期 2
·930-938
·
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.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2019
·
IF 4.561
Xingyu Liu,Jinwei Gao,Guofu Zhou,Wanqiang Liu,Qianming Wang,Yuhui Zheng
The colloidal synthesis of nanoscale perovskites has generated intensive interests very recently and most of the preparation processes are performed in organic phases due to requirement of maintaining the stability. Since the exploration of CsPbX 3 assembly in aqueous medium is still rarely reported in recent years, we use the simple organic building block (2-methylimidazole, MEIM) for the first time to collect the mixture of two metal precursors (CsBr and PbBr 2 ) and CsPbBr 3 /MEIM nanocrystals have been perfectly formed with the aid of the effective organic layer in terms of coordination interactions with metal ions . Such lead halide perovskite material with diameters of 8–10 nm possesses stable and green-emitting feature in pure water. Extensive experimental conditions including reaction time, reagent ratio, addition sequence, pH/temperature dependence and solvent effect have been investigated in details. This study finds a new way to the controllable synthesis of perovskite nanoparticles in eco-friendly solvents and represents a next generation target material for utilization in opto-electronic fields.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Jingyi He,Shimin Liu,Jianmin Gu,Shiqing Xu
All-inorganic lead halide perovskite quantum dots (CsPbX3 QDs, X = Cl, Br, I) glass has elicited extensive attention due to its excellent stability. However, the realization of CsPbX3 QDs glasses with a high photoluminescence quantum yield (PLQY) remains a challenging task. In this study, Eu3+ ions act as nucleating agents to promote the formation and crystallization of CsPbBr3 QDs. Rb+ ions further improve the crystallization quality and reduce the defects between CsPbBr3 QDs and the glass interface. The codoping of Eu3+ and Rb+ ions greatly improved the PLQY of CsPbBr3 QDs. The highest PLQY is achieved in the 0.33Rb-2Eu heat-treated at 500 °C–6 h, reaching 54%. Furthermore, among the light-emitting diodes (LEDs) prepared with 1Cs-0Eu, 1Cs-2Eu, or 0.33Rb-2Eu, 0.33Rb-2Eu has the highest color gamut coverage (108.9% of the National Television Standards Committee color gamut and 92.7% of Rec. 2020 color gamut at 20 mA) and the strongest durable high-power driving capability, making it an ideal material for green LEDs.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
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.
研究领域:
材料科学
·
化学传感器
✓ 已验证
产品关联
DOI
高影响因子
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.
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
Nanomaterials
·
2023
·Vol. 13
·期 16
·2372
·
IF 5.3
Jiaming Wang,Li Zou,Meili Yang,Jiajie Cheng,Yufan Jiang,Guangdong Huang,Jingjing Dong
All-inorganic perovskite quantum dots (CsPbX3QDs) (X = Cl, Br, I) have the advantages of adjustable emission position, narrow emission spectrum, high fluorescence quantum efficiency (PLQY), easy preparation, and elevated defect tolerance; therefore, they are widely used in optoelectronic devices, such as solar cells, light-emitting diodes, and lasers. However, their stability still constrains their development due to their intrinsic crystal structure, ionic exchange of surface ligands, and exceptional sensitivity to environmental factors, such as light, water, oxygen, and heat. Therefore, in this paper, we investigate the stability improvement of CsPbX3QDs and apply fabricated high-efficiency, stable perovskite QDs to solar cells to improve the performance of the cells further. In this paper, we focus on CsPbBr3QDs with intrinsic extreme stability and optimize CsPbBr3QDs using strategies, such as Mn+doping, ligand regulation, and polymer encapsulation, which can improve optical properties while ensuring their stability. The test results show that the above five methods can improve the strength and luminescence performance of QDs, with the best stability achieved when PMMA encapsulates QDs with a ratio of PMMA = 2:1 and PLQY increases from 60.2% to 90.1%.Keywords:perovskite quantum dots;CsPbBr3;PMMA;optical properties;stability
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Kunpeng Mou,Xiaoxi Feng,Fangxiong Tang,Wenzhen Wang,Xudong Tang,Yongning Liu,Benlan Zeng,Sirui Bao,Minghao Cui,Jianing Hu,Huaxing Gou,Yan Zhu,Jinkun Liu,Run Xu
It is of great importance to choose a suitable solvent for the growth of high-quality CsPbBr3 single crystals. Here, by introducing acetonitrile (ACN) to the mixture of dimethyl sulfoxide (DMSO) and dimethylformamide (DMF) solvents, the solubility curve of CsPbBr3 exhibits a monotonic decrease in the temperature range of 20–80 °C, which can reduce the growth temperature to around 45 °C. Besides, the addition of ACN significantly increased the yield of single crystals to 38.71%. The quality of CsPbBr3 single crystals grown in the DMSO/DMF/ACN precursor was improved, evidenced by a full width at half maxima (FWHM) of 0.035° in the X-Ray rocking curve of (100) and the absence of secondary phase inside the crystal from the infrared image. A μτ value of 2.57 × 10−4 cm2 V−1 from the corresponding devices can be achieved, comparable to that of crystals grown by the melt method. Our work here provides a promising solution recipe for the preparation of high-quality CsPbBr3 single crystals.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2020
·Vol. 11
·期 1
·1-9
·
IF 12.121
Zhang Qinggang,Wang Bo,Zheng Weilin,Kong Long,Wan Qun,Zhang Congyang,Li Zhichun,Cao Xueyan,Liu Mingming,Li Liang
Achieving good stability while maintaining excellent properties is one of the main challenges for enhancing the competitiveness of luminescent perovskite CsPbX 3 (X=Cl, Br, I) nanocrystals (NCs). Here, we propose a facile strategy to synthesize ceramic-like stable and highly luminescent CsPbBr 3 NCs by encapsulating them into silica derived from molecular sieve templates at high temperature (600–900 o C). The obtained CsPbBr 3 -SiO 2 powders not only show high photoluminescence quantum yield (~71%), but also show an exceptional stability comparable to the ceramic Sr 2 SiO 4 :Eu 2+ green phosphor. They can maintain 100% of their photoluminescence value under illumination on blue light-emitting diodes (LEDs) chips (20 mA, 2.7 V) for 1000 h, and can also survive in a harsh hydrochloric acid aqueous solution (1 M) for 50 days. We believe that the above robust stabilities will significantly enhance the potential of perovskite CsPbX 3 NCs to be practically applied in LEDs and backlight displays.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Jianming Liu,Shengnan Liu,Ya Chen,Qiliang Zhao,Yajuan Zhao,Weidong Xiang,Xiaojuan Liang,Baodong Ren
Since being synthesized, CsPbX 3 (X = Cl, Br or I) quantum dots (QDs) have gained increased interest due to their superior performances in photovoltaic applications. Herein, Sm 3+ -doped CsPbBr 3 nanocrystallines (NCs) were successfully prepared in zinc borosilicate sodium (ZnO–B 2 O 3 –SiO 2 –Na 2 CO 3 , ZBSN) glass, and the as-prepared glass exhibited a strong red emission, which was attributed to the effects of the energy level transitions in Sm 3+ . Importantly, white light-emitting diodes (W-LEDs) were prepared by combining the glass with a blue InGaN chip, eliminating the need for a red phosphor to provide the red light, and white light was generated with a high colour rendering index (CRI: 82.6), a low correlated colour temperature (CCT: 4455 K) and colour coordinates in the white light region (0.3547, 0.3234). The glasses show excellent stability at 85 °C and 85% RH. Therefore, the Sm 3+ -doped CsPbBr 3 NCs glass can be used as a colour converter for application in lighting engineering.
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
危险品化学品经营许可证（带存储）