ACS Applied Electronic Materials
·
2021
·
IF 3.314
Jindou Shi,Ye Tian,Wenxing Gao,Meimei Xu,Yuanting Wu,Wanyin Ge
Exploring a convenient method to solve the stability problem of all-inorganic halide perovskite nanocrystals (NCs) has become an urgent task in their practical application. In recent years, cesium lead halide perovskite CsPbX3 (X = Cl, Br, and I) NCs, as the star material for the development of next-generation optoelectronic devices, have stimulated tremendous interest due to their excellent optical and electronic properties. Unfortunately, the performance of CsPbX3 NCs will become impaired due to interference from the external environment. Here, a convenient one-pot method was proposed, and the transition of CsPbBr3 quantum dots to two-dimensional CsPbBr3/CsPb2Br5 composite plates (CPs) was achieved by adjusting the reaction time. Large-scale octagonal CsPbBr3/CsPb2Br5 CPs were quickly obtained, and the morphology and phase transition in the entire reaction time period were explored. Subsequently, the products obtained at different reaction times were evaluated for long-term storage stability under air conditions, and the results showed that the CsPbBr3/CsPb2Br5 CPs exhibited excellent photoluminescence stability. The proposed preparation method presents a convenient way to improve the stability of CsPbX3 with low cost. On the other hand, by incorporating these products into thermoplastic polyurethane (TPU), a waterproof ink material that can be written directly was realized, where CsPbBr3/CsPb2Br5/TPU waterproof composite ink exhibits excellent stability and recyclability under aqueous solutions at different temperatures, which will provide a new choice for the commercial development of perovskite.
研究领域:
材料科学
·
化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2023
·
IF 9
Qiliang Zhu,Fan Ye,Wei Yan,Jingrun Zhu,Jianhua Shen,Kan-Hao Xue,Yihua Zhu,Chunzhong Li
All-inorganic lead halide perovskite nanocrystals (NCs) have shown great potential in various optoelectronic device applications due to their excellent optoelectronic properties, but their poor stability remains a key obstacle to widespread application. The preparation of core/shell NCs is developed to improve their stability, but most of the coating for single NCs is incomplete, and the crystal orientation and interface binding of core/shell structures are still unclear. Here, a surface reconstruction strategy to synthesize CsPbBr 3 /CsPb 2 Br 5 core/shell NCs with uniform coating structure is reported. The concentration of [PbBr 8 ] 6− monomer in the system is regulated by creating local low H 2 O concentration conditions to balance the erosion of perovskite by water and the overall heterogeneous nucleation reaction system, resulting in single encapsulated and well-edged perovskite core/shell NCs. More importantly, advanced characterization tools are used to reveal the core/shell structural features of CsPbBr 3 /CsPb 2 Br 5 core/shell NCs at the atomic scale, which has not been reported before, and the interface matching of the two-phase binding is simulated by density functional theory calculations, which confirm that the CsPb 2 Br 5 (116) facet can bind to the CsPbBr 3 (100) facet with the lowest binding energy. The prepared core/shell perovskite NCs can still retain photoluminescence emission after >30 days in water.
研究领域:
材料科学
·
纳米技术
·
光电子学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Jingcheng Zheng,Jie Chen,Ruifen Sun,Weiwei Zhang,Yun Huang,Jiwei Shao,Yuwu Chi
Fluorescent immunochromatographic test (FICT) strips have received extensive attention due to their virtue of simple operation, low cost, and a point-of-care (POC) assay. In recent years, people are constantly seeking new labels to improve the sensitivity of immunosensors. Perovskite nanocrystals (PNCs) possess strong fluorescence and a narrow emission peak, making them an excellent choice as a new fluorescent signal label. Herein, we have developed a simple, fast, and environmentally friendly method to synthesize CsPbBr 3 /CsPb 2 Br 5 @SiO 2 with the good water stability and high biocompatibility. These CsPbBr 3 /CsPb 2 Br 5 @SiO 2 have been applied to construct FICT strips. To achieve the quantitative determination of human chorionic gonadotropin (HCG), a lab-made FICT strips detection system was established. The FICT strips had a good linear relationship to HCG in the range of 5–500 ng/mL, and the detection limit was 2.09 ng/mL. In addition, the recovery results of HCG detection in human urine samples also proved the feasibility of this FICT strips. CsPbBr 3 /CsPb 2 Br 5 @SiO 2 can also be modified with different biomarkers for functionalization, which exhibits a promising application in the development of sensing platform of FICT strips.
研究领域:
分析化学
·
材料科学
·
生物传感
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2021
·
IF 5.165
Yufeng Zhou,Yanxia Yu,Yaqian Zhang,Xiaodong Liu,Haisheng Yang,Xiaojuan Liang,Wei Xia,Weidong Xiang
All-inorganic halide perovskite (CsPb2Br5) nanocrystals (NCs) have received widespread attention owing to their unique photoelectric properties. This work reports a novel strategy to control the phase transition from CsPbBr3 to CsPb2Br5 and investigates the effects of different treatment times and treatment temperatures on perovskite NCs formation. By controlling the volume of tetraethoxysilane (TEOS) added, the formation of different phases of perovskite powder can be well controlled. In addition, a white light-emitting diode (WLED) device is designed by coupling the CsPbBr3/CsPbBr3–CsPb2Br5 NCs@TEOS nanocomposite and CaAlSiN3:Eu2+ commercial phosphor with a 460 nm InGaN blue chip, exhibiting a high luminous efficiency of 57.65 lm/W, color rendering index (CRI) of 91, and a low CCT of 5334 K. The CIE chromaticity coordinates are (0.3363, 0.3419). This work provides a new strategy for the synthesis of CsPbBr3/CsPbBr3–CsPb2Br5 NCs@TEOS nanocomposite, which can be applied to the field of WLEDs and display devices.
研究领域:
材料科学
·
光电子学
·
纳米技术
·
发光二极管（LED）
·
光子学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Chen Zhang,Zeyu Wang,Minqiang Wang,Jindou Shi,Junnan Wang,Zheyuan Da,Yun Zhou,Youlong Xu,Nikolai V. Gaponenko,Arshad Saleem Bhatti
Although cesium halide lead (CsPbX3, X = Cl, Br, I) perovskite quantum dots (QDs) have excellent photovoltaic properties, their unstable characteristics are major limitations to application. Previous research has demonstrated that the core–shell structure can significantly improve the stability of CsPbX3 QDs and form heterojunctions at interfaces, enabling multifunctionalization of perovskite materials. In this article, we propose a convenient method to construct core–shell-structured perovskite materials, in which CsPbBr3@CsPb2Br5 core–shell micrometer crystals can be prepared by controlling the ratio of Cs+/Pb2+ in the precursor and the reaction time. The materials exhibited enhanced optical properties and stability that provided for further postprocessing. Subsequently, CsPbBr3@CsPb2Br5@TiO2 composites were obtained by coating a layer of dense TiO2 nanoparticles on the surfaces of micrometer crystals through hydrolysis of titanium precursors. According to density functional theory (DFT) calculations and experimental results, the presence of surface TiO2 promoted delocalization of photogenerated electrons and holes, enabling the CsPbBr3@CsPb2Br5@TiO2 composites to exhibit excellent performance in the field of photocatalysis. In addition, due to passivation of surface defects by CsPb2Br5 and TiO2 shells, the luminous intensity of white light-emitting diodes prepared with the materials only decayed by 2%–3% at high temperatures (>100 °C) when working for 24 h.
研究领域:
材料科学
·
光催化
·
光电
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Yuechan Li,Xiaolu Yang,An Xie
Lead halide perovskite CsPbBr 3 nanocrystals (NCs) have attracted great interest in recent years owing to their excellent properties such as strong light absorption , high photoluminescence quantum yield (PLQY), good wavelength tunability, and narrow FWHM. However, their instability is still a bottleneck for their potential application. In this work, a pseudo-peritectic method, which is a peritectic reaction in solutions, was proposed. The phenomenon of “Survival of the fittest” was observed. The synthesized CsPb 2 Br 5 phase greatly reduces the surface defects , and improves the stability and PL properties. The pseudo-peritectic method using for preparing surface modified CsPbBr 3 @CsPb 2 Br 5 nanocrystals is a significant pathway to achieve long-term stable lead halide perovskite for optoelectronic devices .
研究领域:
材料科学
·
纳米技术
·
光电
✓ 已验证
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2021
·
IF 9.811
Tianyuan Liang,Wenjie Liu,Xiaoyu Liu,Yuanyuan Li,Wenhui Wu,Jiyang Fan
The instability of the metal halide perovskites upon exposure to moisture or heat strongly hampers their applications in optoelectronic devices. Here, we report the large-yield synthesis of highly water-resistant total-inorganic green luminescent CsPbBr3/CsPb2Br5 core/shell heteronanocrystals (HNCs) by developing an in situ phase-transition approach. It is implemented via the water-driven phase transition of the original monoclinic CsPbBr3 nanocrystal and the resultant tetragonal CsPb2Br5 nanoshell has a small lattice mismatch with the CsPbBr3 core, which ensures formation of an epitaxial interface for the synthesised CsPbBr3/CsPb2Br5 HNCs. These HNCs maintain nearly 100% of the original luminescence intensity after immersion in water for 11 months and the luminescence intensity drops only to 81.3% at 100 °C. Transient luminescence spectroscopy and density functional theory calculation reveal that there are double radiative recombination channels in the core CsPbBr3 nanocrystal, and the electron potential barrier provided by the CsPb2Br5 nanoshell significantly improves the exciton recombination rate. A prototype quasi-white light-emitting device based on these robust CsPbBr3/CsPb2Br5 HNCs is realized, showing their strong competence in solid-state lighting and wide color-gamut displays.
研究领域:
材料科学
·
纳米技术
·
光电子学
·
钙钛矿光伏
·
固态照明
✓ 已验证
DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2022
·Vol. 5
·期 2
·1423-1432
·
IF 11.806
Xie Kehan,Wei Shijing,Alhadhrami A.,Liu Jie,Zhang Putao,Elnaggar Ashraf Y.,Zhang Feng,Mahmoud M. H. H.,Murugadoss Vignesh,El-Bahy Salah M.,Wang Feijiu,Li Chao,Li Guoqiang
Heterogeneous metal halide perovskites (MHPs) are of great interest in photovoltaic and photocatalytic applications because of their high photon-to-electron conversion efficiency. However, the improvement in the stability of heterogeneous MHP is still a great challenge and has rarely been reported for polar solvent–based photocatalytic applications. Herein, we report a precisely controllable synthesis of CsPbBr 3 /CsPb 2 Br 5 heterogeneous crystals into mesoporous hollow SiO 2 spheres to form the CsPbBr 3 /CsPb 2 Br 5 @SiO 2 yolk-shell microspheres. The composition modulation by simply adjusting the ratio of Cs + and Pb 2+ could result in the perovskite structure evolution from CsPbBr 3 to CsPbBr 3 /CsPb 2 Br 5 and CsPb 2 Br 5 . The prepared CsPbBr 3 /CsPb 2 Br 5 @SiO 2 were dispersed in the aqueous rhodamine B solutions and exhibited higher photocatalytic activities than the commercial TiO 2 (P25). The improvement in the photocatalytic efficiency is mainly caused by the formation of heterogeneous CsPbBr 3 /CsPb 2 Br 5 to boost the spatial charge separation efficiency. Graphical abstract
研究领域:
材料科学
·
纳米技术
·
光催化
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Jiejun Ren,Longyun Liu,Fan Liu,Huiping Liu,Xiaopeng Zhou,Gen Li,Liangjun Chen,Guoping Yan,Yuhua Wang
Lead halide perovskite (LHP) nanocrystals (NCs) suffer from poor stability against environmental factors (heat, moisture, oxygen, etc.), which seriously hinders their practical application. Constructing a core-shell structure could be an effective approach to improve the stability and optical properties of the LHP NCs. Herein, a novel strategy of water-triggered phase transformation and phospholipid (DSPE) micelle encapsulation is proposed, generating highly luminescent water-dispersed CsPbBr 3 @CsPb 2 Br 5 @DSPE core-shell-shell nanocrystals. The epitaxial growth of the CsPb 2 Br 5 shell is induced by the in-situ reconstruction of the CsPbBr 3 surface by water erosion, and the lattice mismatch with the CsPbBr 3 core is small (3.8%). The further amphipathic phospholipid encapsulation guarantees their excellent water dispersity and stability. Revealed by the femtosecond transient absorption spectroscopy, the dense CsPb 2 Br 5 @DSPE shell effectively passivates the surface of the CsPbBr 3 core, thus improving its stability and luminescence performance. The resulting CsPbBr 3 @CsPb 2 Br 5 @DSPE nanoparticles exhibit excellent performance as fluorescent probes for bioimaging, aqueous inks for high-resolution pattering, and light conversion layers for LEDs, demonstrating their promising potential in multiple applications.
研究领域:
材料科学
·
生物医学工程
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2022
·Vol. 28
·期 50
·e202201095
·
IF 5.02
Peng Gao,Zihao Cui,Xiaolei Liu,Yaqiang Wu,Qianqian Zhang,Zeyan Wang,Zhaoke Zheng,Hefeng Cheng,Yuanyuan Liu,Qing Li,Baibiao Huang,Peng Wang
Graphical Lead halide perovskite has triggered a lot of research due to its superior optical properties. However, halide perovskite materials have poor environmental stabilities and are easily affected by external factors such as water and heat, resulting in structural decomposition and performance failure. Contrary to this commonplace concept, CsPbBr 3 can convert to CsPb 2 Br 5 partially when meeting a small amount of water, and the CsPbBr 3 @CsPb 2 Br 5 composite is synthesized by an in situ method accordingly. The CsPbBr 3 @CsPb 2 Br 5 composite shows an enhanced catalytic performance compared with pure CsPbBr 3 , as well as a dramatically synergistic effect of photo and thermal for catalytic CO 2 hydrogenation. Lead halide perovskite has triggered a lot of research due to its superior optical properties. However, halide perovskite materials have poor environmental stabilities and are easily affected by external factors such as water and heat, resulting in structural decomposition and performance failure. Contrary to this commonplace concept, it is found that CsPbBr 3 (CPB) can convert to CsPb 2 Br 5 (CP2B5) partially when meeting a small amount of water, and the CsPbBr 3 @CsPb 2 Br 5 (CPB@CP2B5) composite is synthesized by an in situ method accordingly. The CPB@CP2B5 composite shows an enhanced catalytic performance compared with pure CPB, as well as a dramatically synergistic effect of photo and thermal for catalytic CO 2 hydrogenation. The CO production rate of CPB@CP2B5 is determined as 69 μmol g −1 h −1 under light irradiation at 200 °C, which is 156.8 and 43.4 times higher than that under pure photo (0.44 μmol g −1 h −1 ) and pure thermal (1.59 μmol g −1 h −1 ) condition, respectively. Meanwhile, the CPB@CP2B5 sample is also stable, which shows no significant decline in the catalytic activity during 8 cycles of repeated experiments. The probable mechanism is explored by utilizing a series of in situ characterizations.
研究领域:
材料科学
·
催化化学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）