JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yuehong Yin,Yukun Liu,Guohua Cao,Zhaoyue Lv,Haitao Zong,Yujie Cheng,Qifan Dong,Chen Liu,Ming Li,Baoqing Zhang
The Cs-Pb-Br system possesses excellent optical properties and unique phase transition characteristics due to soft lattice structures. Herein, a simple and green synthetic method based on self-assembly in Dimethyl formamide (DMF) is proposed to prepare CsPb 2 Br 5 nanocrystals (NCs) with typical tetragonal structure, which exhibit orange emission and small size around 3.87 nm. Interestingly, the phase transition from CsPb 2 Br 5 to CsPbBr 3 occurs easily in DMF through mechanical induction, while the metastable mixed-phase structural CsPbBr 3 NCs with an average size of about 5 nm appear and show bright yellow emission. Afterwards, in combination with the supersaturation crystallization method, stable cubic CsPbBr 3 NCs with 13 nm size are obtained and display the effective green emission. The synthesized CsPb 2 Br 5 and steady-state CsPbBr 3 NCs exhibit good optical stability in solution, while the metastable CsPbBr 3 NCs undergo a change in emission from yellow to green with increasing time.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Lan Ding,Burenbayaer Borjigin,Yuning Li,Xiaoxue Yang,Xiaojing Wang,Huiqin Li
Conversion of CO2 into valuable chemical feedstocks through artificial photosynthesis is an effective strategy to alleviate energy and environmental issues. Herein, we have developed a novel perovskite-based catalyst via in situ growing CsPbBr3 quantum dots (QDs) on the affinal 2D CsPb2Br5 nanosheets for CO2 photoconversion. CsPbBr3 QDs were generated by peeling off layers from their cubic counterpart; meanwhile, CsPb2Br5 nanosheets were formed by heaping up the peeled layers. The resultant dual-phase composite exhibited outstanding activity and selectivity for photocatalytic conversion of gaseous CO2 with a CO generation rate of 197.11 μmol g–1 h–1 under 300 W Xe lamp irradiation, which is 2.5 and 1.1 times higher than that of pure CsPb2Br5 or CsPbBr3. Importantly, the fabricated dual-phase material presented extremely high stability and was able to maintain an unchangeable CO2 conversion rate under wet air in the consecutive 10 h of recycling test. Furthermore, attributing to the in situ assembling strategy, the close contact allowed photo-generated electrons in CsPbBr3 QDs to transfer rapidly to CsPb2Br5, and the affluent active sites in such an architecture enabled achieving enhanced CO2 photoconversion activity. The present work provides an attractive approach for in situ constructing a consubstantial perovskite-based composite photocatalyst to ensure great stability and excellent activity for artificial photocatalytic CO2 conversion.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Ziwei Sun,Yong Wang,Ye Liu,Ruliang Liu,Tao Chen,Shuming Ye,Niu Lai,Haoyang Cui,Feng Lin,Rongfei Wang,Jie Yang,Shaoying Ke,Chong Wang
All-inorganic perovskite materials have gained enormous attention in photodetectors (PDs) due to their high charge carrier mobility, cost-effectiveness, and tunable bandgap. However, instability and corresponding performance degradation of perovskite PDs when exposed to surrounding humidity persist as challenges. In this work, a composite PD was fabricated by combining CsPb2Br5 nanowires and CsPbBr3 thin-film perovskites as an example to address these problems. The CsPb2Br5 nanowires were prepared by a facile water-bath method to improve the water resistance, and the subsequent evaporation of the CsPbBr3 film formed a type-I heterostructure to enhance its photosensitivity of PDs. As a result, the device exhibits a 10 times higher responsivity of 206 mA/W than that of the bare CsPbBr3 thin film device and maintains 92.85% of its original detectivity after being exposed to a humid environment (RH = 75%) for 144 h. Furthermore, the corresponding fundamental characterization was also performed to reveal the role of CsPb2Br5 nanowires in enhancing the overall performance of the PD. This work provides a simple and efficient approach to enhancing the durability and performance of all-inorganic halide perovskite devices through the embedding of CsPb2Br5 perovskite nanowires.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2019
·Vol. 21
·期 9
·1352-1357
·
IF 3.382
Jian Yin,Guodong Zhang,Xutang Tao
A facile fractional crystallization technique was developed to prepare single crystalline CsPb2Br5 films using water as the solvent, and the films can be easily transferred onto various substrates for the device fabrication. The obtained films can be up to 600 × 600 μm2 and decrease to 50 nm in thickness with high crystalline quality as well as temperature and air stability.
研究领域:
材料科学
·
晶体学
·
光电子器件
✓ 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
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Lei Wang,Decao Ma,Chun Guo,Xin Jiang,Mingliang Li,Tingting Xu,Jinpeng Zhu,Bingbing Fan,Wen Liu,Gang Shao,Hongliang Xu,Hailong Wang,Rui Zhang,Hongxia Lu
All-inorganic halide perovskite nanocrystals (NCs) are generally prepared by liquid phase method with the help of volatile organic solvents, inert gas protection and complex organometallic precursors. Herein, a simple, efficient and green method based on all-solid-state mechanochemical synthesis is proposed to prepare CsPbBr 3 NCs. NCs with excellent performance can be prepared by grinding raw materials CsBr and PbBr 2 through high energy ball milling, and prepared NCs show good stability in ethanol and living conditions. Interestingly, CsPbBr 3 NCs prepared by ball milling have a sudden increase in their fluorescence intensity dispersed in water. After soaking for 8 h, CsPbBr 3 NCs have been almost entirely transformed into CsPb 2 Br 5 NCs. The fluorescence intensity of samples is 80 times of that before soaking, and absolute PL quantum yield (PLQY) of samples increases significantly by up to 92%. These results provide a strong evidence for the current debate about whether CsPb 2 Br 5 emits light and propose a deeper understanding about structural transition from orthorhombic CsPbBr 3 to tetragonal CsPb 2 Br 5 , which is of great significance to the application of CsPb 2 Br 5 in optoelectronic devices. This will provide a new idea for the synthesis and transformation of halide perovskites.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
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
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
ACS Applied Nano Materials
·
2024
·
IF 5.3
Yubin Zhao,Xing Cao,Huanhui Chen,Ya Liu,Liubiao Zhong,Yejun Qiu
Low-dimensional metal halides are favored for optoelectronic device applications due to their strong electron–phonon coupling capability, which produces exciton self-trapping and broadband emission optoelectronic properties. Conventional methods for enhancing electron–phonon coupling involve the introduction of permanent defects or lattice distortions that inhibit the intrinsic structure and properties. In this work, we report that Cu-doped CsPb2Br5 nanocrystals exhibit broadband red emission with a high Stokes shift, a long fluorescence lifetime (9.27 μs), and a high photoluminescence quantum yield (∼ 36%) in the visible to near-infrared spectral range (∼550 to 825 nm). At the same time, the fact that the emission spectrum is independent of the excitation wavelength and the excitation spectrum is independent of the emission wavelength, together with the similarity of the decay kinetics, suggests that the broad-band emission has intrinsic properties. The soft vibrational modes of Raman spectroscopy indicate the softness of the lattice and the highly anharmonic character of the structure on the global and local scales. These properties lead to short-range elastic lattice deformation of Cu/CsPb2Br5 nanocrystals upon photoexcitation by strong electron–phonon coupling, resulting in self-trapped exciton emission. This method of doping-induced local distortion and exciton self-capture provides a way to improve the properties of the optoelectronic materials. Meanwhile, the fluorescence change in the crystal structure from CsPbBr3 to CsPb2Br5 can also be used for anticounterfeiting inks. Therefore, CsPb2Br5 crystals have promising applications in solid-state lighting and optoelectronic devices.
研究领域:
材料科学
·
光学
·
固体物理
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2024
·
IF 2.6
Yuwei Zhong,Xinran Li,Hao Zhang,Rong Zhang,Kaiwen Hu,Xuedong Zhou,Yi Xie
Despite the rising advances in the field of all-inorganic CsPb2Br5-based materials and their photoelectronic applications, the exploitation of facile synthetic procedures and enhancement of optical properties remain challenging. Herein, we report a facile room-temperature aqueous phase synthesis of orange-red-emitting cation-doped and codoped CsPb2Br5 materials with enhanced photoluminescence (PL) performance and stability. Only very weak broad PL peak at around 618 nm is observed in the undoped CsPb2Br5 microsheets. However, doping with Cu, and codoping with Cu/Mn, Cu/Zn or Cu/Cd significantly enhance the PL intensity of the resulting CsPb2Br5-based samples. The stability of the representative Cu-doped and various codoped CsPb2Br5 is evaluated under various conditions such as soaking in water, high temperature up to 150oC, and ambient environment at room temperature. This work provides facile and cost-effective path for large-scale and controlled synthesis of orange-red emmisive CsPb2Br5-based materials with enhanced optical performances, excellent environmental stability, and potentials in LEDs.
研究领域:
材料科学
·
光电技术
·
纳米技术
·
化学
✓ 已验证
产品关联
DOI
高影响因子
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
危险品化学品经营许可证（带存储）