CRYSTAL RESEARCH AND TECHNOLOGY
·
2021
·Vol. 56
·期 8
·2100004
·
IF 1.639
Rui Sun,Haixia Li,Yimin Guan,Yong Du,Hui Shen,Jiayue Xu
Lead halide perovskites display remarkable optoelectronic properties, like large absorption coefficients, high photoluminescence quantum efficiencies, and long lifetime and diffusion length of photocarriers. This system is easily fabricated using solution processes and inkjet printing is an effective way to prepare halide perovskite films and complex patterns. In this work, the crystallization behaviors of inkjet printing CH 3 NH 3 PbBr 3 crystals are systematically investigated with varied I − doping, printing times, and solvents. Using N , N -dimethylformamide (DMF) solvent, CH 3 NH 3 PbBr 3− x I x ( x = 0, 0.14, 0.29, 0.45, 0.59) are printed on the glass and the crystalline grains are developed from the (001) oriented tetragonal in side length of 10–50 µm to dendrite with increasing I − concentrations. The crystalline grains are kept tetragonal, while the average crystal size changes from 22 to 89 µm by increasing the number of printing from 10 to 1000 times. DMF and dimethyl sulfoxide (DMSO) are used as solvents for printing CH 3 NH 3 PbBr 3 , and more regular grains are obtained from DMF solvent. Several patterns are printed on glass and papers, and fluorescent two-dimensional (2D) patterns are observed under the 480 nm excitation. The as-printed patterns show excellent homogeneity and high reproducibility, indicating that the inkjet printing shows broad application prospects in flexible electronics.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Liming Zhao,Carl Redshaw,Kuixing Ding,Pengyue Zhang,Bin Chen,Zhirong Chen,Jiugang Hu,Haohong Li
Metal organic frameworks (MOFs) contain ordered pores capable of encapsulating varied types of guests and provide a platform to expand the flexibility and versatility of the host-guest composites. Herein, by encapsulating CH 3 NH 3 PbBr 3 NP S into Ln-MOFs (Ln = La, Nd, Pr, Sm), four CH 3 NH 3 PbBr 3 @Ln-MOFs host-guest composites were fabricated and served as a bifunctional platform. The temperature-dependent luminescence properties of the CH 3 NH 3 PbBr 3 @Ln-MOFs were explored and the results revealed their tuneable green luminescence performance. In particular, the CH 3 NH 3 PbBr 3 @Sm-MOF exhibits a variety of colours from green to blue to purple and an excellent quantum yield of 0.98. The photocurrent responses and theoretical calculations reveal the enhancement mechanism of CH 3 NH 3 PbBr 3 on charge-hole separation owing to its unique host-guest synergy. Moreover, the CH 3 NH 3 PbBr 3 @Sm-MOF exhibits the excellent electrical bi-stability with a high ON/OFF ratio of 10 4 . Hence, the CH 3 NH 3 PbBr 3 @Ln-MOFs host-guest composites are promising candidates for a new generation of photovoltaic, light-emitting, and switching memories devices.
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
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Lin Zhu,Xiaoyue Su,Hao Ma,Lianze Shan,Bing Zhao
Spectra in surface-enhanced Raman scattering (SERS) are always accompanied by a continuous emission known as “background”, which complicates the analysis with a poor signal-to-noise ratio (SNR), especially for qualitative and quantitative detection. Here, the SERS profile of the CH 3 NH 3 PbBr 3 substrate displays high similarity with the bulk Raman spectra, and its FWHM is exceeding narrow. The significantly increased SNR of the probe molecules indicates that the substrate helps to improve the quantitative analysis capability of the SERS technology and alleviate the background-related problems. For the CH 3 NH 3 PbBr 3 substrate, good linearity (R 2 = 0.9591) in the range of 1.0 × 10 -7 − 1.0 × 10 -3 mol/L was obtained and the limit of detection (LOD) is 7.88 × 10 -6 mol/L. The reason for this excellent performance is that the introduction of organic molecules splits the 3D CH 3 NH 3 PbBr 3 substrate to form a 2D perovskite that fixes the molecular orientation through chemical interactions. The CH 3 NH 3 PbBr 3 has the advantage of maintaining the conformation and orientation consistency of adsorbed molecules. Meanwhile, compared with the commonly used noble metal (Au, Ag) and semiconductor (ZnO, TiO 2 ) SERS substrates, the CH 3 NH 3 PbBr 3 substrate has obvious superiorities in both spectral peak intensity and peak shape. Furthermore, the CH 3 NH 3 PbBr 3 substrate possesses specific recognition ability that has the same enhancement effect for a series of pyridine-containing probe molecules. Finally, the enhancement mechanism is discussed according to the CT contribution. As a promising substrate for SERS technology, CH 3 NH 3 PbBr 3 will provide more possibilities for quantitative and multiplex detection in the future.
研究领域:
分析化学
·
材料科学
·
光谱学
✓ 已验证
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2018
·
IF 3.972
Feng Chen,Chunxiang Xu,Qingyu Xu,Yizhi Zhu,Zhu Zhu,Wei Liu,Xiuxiu Dong,Feifei Qin,Zengliang Shi
CH3NH3PbBr3 single crystal, one of organometal halide perovskites, as novel optoelectronic and photovoltaic materials could be easily precipitated using an antisolvent method. Understanding of the growth mechanism will significantly improve reproducibility, quality, and controllability of the single crystals. However, it is difficult to capture the growth process due to the super solubility of CH3NH3PbBr3 crystals in N,N-dimethylformamide solution. Here, filter paper was used to separate the intermediate states of CH3NH3PbBr3 crystals out of N,N-dimethylformamide solution in the growth process. The developed fabrication approach can monitor the morphology evolution of CH3NH3PbBr3 single crystals as a whole. Meanwhile, the precursor solution’s properties and degradation of CH3NH3PbBr3 single crystals were also investigated systematically. It indicates that the CH3NH3PbBr3 single crystal growth process is similar to sodium chloride crystals grown from solution in the presence of nitrilotriacetamide. The results help us to deeply discern the growth mechanism of CH3NH3PbBr3 single crystal in N,N-dimethylformamide solution and design controllable optoelectronic devices.
研究领域:
材料科学
·
光电材料
·
晶体生长
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2016
·Vol. 4
·期 11
·1732-1737
·
IF 5.359
Wen-Gao Lu,Cheng Chen,Dengbao Han,Linhua Yao,Junbo Han,Haizheng Zhong,Yongtian Wang
Graphical The comparison between organic–inorganic CH 3 NH 3 PbBr 3 quantum dots and all inorganic halide perovskite CsPbBr 3 quantum dots allows to understand the structural difference and corresponding optical properties. Using Z-scan measurements, it is revealed that colloidal CH 3 NH 3 PbBr 3 exhibits enhanced two-photon absorption properties compared to those of CsPbBr 3 quantum dots due to their structural difference.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Ling He,Yi Ding,Qizheng Dong,Weimin Sun,Yuhua Wang
CH 3 NH 3 PbBr 3 perovskite quantum dots (PeQDs) have demonstrated excellent performance and are promising for optoelectronic applications . However, poor stability caused by surface defects severely limits their further development. In this work, cheap, green Tartaric acid (Ta) was introduced as a multisite passivator for the synthesis of CH 3 NH 3 PbBr 3 PeQDs by ligand-assisted reprecipitation at room temperature , and the effect of Ta on the luminous properties and stability of CH 3 NH 3 PbBr 3 PeQDs was investigated. The hydroxyl group of Ta can anchor Br − of PbBr 6 4− octahedra , reducing the Br vacancy by reducing surface Br − loss, and the carboxyl group can form a coordination bond with Pb 2+ , all contributing to reducing surface defects , inhibit heavy metal leakage, reduce toxicity and improve luminous properties and stability. The results showed that the FWHM (full width at half maxima) of the Ta-modified PeQDs was 19 nm, PLQY reached 88.24 % and showed bright fluorescence for 100 days at room temperature. Ta-modified PeQDs-based white LED (WLED) emitted cold white light, with ultrahigh luminous efficiency of 121.57 lm/W, color gamut of 127 % of the National Television System Committee (NTSC) standard and high operate stability. Our work provides new ideas for low-cost preparation of perovskite devices with high optoelectronic performance.
研究领域:
材料科学
·
光学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2022
·
IF 18.027
Huanyu Zhang,Tingxiu Yu,Chaoqiang Wang,Ruofei Jia,Azhar Ali Ayaz Pirzado,Di Wu,Xiujuan Zhang,Xiaohong Zhang,Jiansheng Jie
Micro-/nanosized organic–inorganic hybrid perovskite single crystals (SCs) with appropriate thickness and high crystallinity are promising candidates for high-performance electroluminescent (EL) devices. However, their small lateral size poses a great challenge for efficient device construction and performance optimization, causing perovskite SC-based light-emitting diodes (PSC-LEDs) to demonstrate poor EL performance. Here, we develop a facile liquid-insulator bridging (LIB) strategy to fabricate high-luminance PSC-LEDs based on single-crystalline CH3NH3PbBr3 microflakes. By introducing a blade-coated poly(methyl methacrylate) (PMMA) insulating layer to effectively overcome the problems of leakage current and possible short circuits between electrodes, we achieve the reliable fabrication of PSC-LEDs. The LIB method also allows us to systematically boost the device performance through crystal growth regulation and device architecture optimization. Consequently, we realize the best CH3NH3PbBr3 microflake-based PSC-LED with an ultrahigh luminance of 136100 cd m–2 and a half-lifetime of 88.2 min at an initial luminance of ∼1100 cd m–2, which is among the highest for organic–inorganic hybrid perovskite LEDs reported to date. Moreover, we observe the strong polarized edge emission of the microflake-based PSC-LEDs with a high degree of polarization up to 0.69. Our work offers a viable approach for the development of high-performance perovskite SC-based EL devices.
研究领域:
材料科学
·
光电子学
·
纳米技术
·
半导体器件
✓ 已验证
DOI
高影响因子
IRANIAN POLYMER JOURNAL
·
2025
·
IF 2.8
Wang Haiping,Xia Ji,Lu Qi,An Xianhui,Chang Ziyang,Yang Gang,Qian Xueren
Perovskites nanocrystals and luminescent metal–organic frameworks (MOF) were investigated for anticounterfeiting materials because of their exciting optoelectronic and optical properties. MOFs have always served as an excellent host for encapsulating perovskite leveraging their inherent porosity. In this paper, we prepared fluorescent anticounterfeiting paper with two luminescence modes by different fluorescence properties of Tb-metal–organic framework (Tb-MOF) and perovskite (MAPbBr 3 ). In order to obtain the appropriate loading capacity of Tb-MOF on the surface of pulp fibers (PFs), the reaction conditions containing temperature, time and amount were optimized. The selection of pyromellitic acid (H 4 BTC) as a ligand not only improved the luminescence efficiency of Tb 3+ , it also increased the deposition rate of Tb-MOF due to the uncoordinated carboxyl group forming hydrogen bond with hydroxyl group of PFs. For the sake of controlling the formation rate and reducing agglomeration of MAPbBr 3 , Pb 2+ was doped in Tb-MOF. Fluorescent anticounterfeiting writing of Pb/Tb-MOF@PFs was realized by CH 3 NH 3 Br (MABr) ink. Then, Pb/Tb-MOF was used as porous templates and lead sources to prepare MAPbBr 3 @Pb/Tb-MOF with two luminescence modes at 254 nm and 365 nm UV excitation wavelength to achieve multilevel anticounterfeiting. Under excitation wavelengths of 254 nm and 365 nm, MAPbBr 3 @Pb/Tb-MOF@CFs exhibited quantum yields of 6.48% and 2.62%, respectively, while decay times of 0.77 ms and 4.96 ns were detected at an emission wavelength of 545 nm and 512 nm. Consequently, the current study not only provides a new idea for the synthesis of MAPbBr 3 and their controllable anchoring on support materials but also offers an effective method for fluorescent anticounterfeiting. Graphical abstract
研究领域:
材料科学
·
纳米技术
·
光电子学
·
化学
·
安全技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MODERN OPTICS
·
2023
·
IF 1.3
Sizhong Yi,Yuanhao Huang,Jie Zou,Yuheng Wang,Jiawen Jian,Qinghui Jin,Xiaowei Zhang,Xin Zhang
Recently, metal halide perovskite quantum dots (MHPQDs) have attracted considerable interest in sensing activities due to their excellent optoelectronic properties and high surface activity. Here, aiming for heavy metal detection, we proposed an ultrasensitive turn-off fluorescent probe based on MAPbBr3 MHPQDs for the measurement of copper ions in an organic solvent. A low limit of detection (LOD) of 5.6nM was achieved and the test range was recorded from 0nM to 100nM. In order to achieve this high sensitivity, a thin film layer of electrospun polystyrene(PS) nanofibre was introduced for the structural support of MHPQDs, by which the sensitivity increased two orders of magnitude. The quenching mechanism is also discussed in the paper. We believe the electron transfer effect between Cu2+ and perovskite QDs made the main contribution for turn off sensing in our prototype device.
研究领域:
材料科学
·
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Hang Chen,Chao Liu,Ping Lin,Haihua Hu,Qingyu Meng,Lingbo Xu,Peng Wang,Xiaoping Wu,Can Cui
Organic hybrid CH 3 NH 3 PbBr 3 (MAPbBr 3 ) perovskite single crystal (SC) is popular in the field of photoelectric detection due to its outstanding photoelectric properties, but its performance is seriously limited by surface defects . Here, we report a surface passivation method to effectively reduce the surface defects by immersing MAPbBr 3 SC in an isopropanol (IPA) solution of CH 3 NH 3 Br (MABr). Compared to the untreated SC, the photoluminescence intensity of the homologous MABr treated SC is greatly enhanced by passivation treatment, and the photogenerated carrier lifetime increases from 16 ns to 148 ns. The space charge limited current (SCLC) results show that the trap state density is substantially reduced from 2.34 × 10 9 cm −3 to 7.22 × 10 8 cm −3 . The X-ray photoelectron spectrum (XPS) of the Pb element presents a significantly reduced peak of metalized Pb, confirming that the metalized Pb ion defects at the surface are effectively passivated. The asymmetry in current-voltage ( I - V ) curves arising from ion migration is substantially compressed. Furthermore, the photocurrent is significantly enhanced, and the responsivity and detectivity are ∼ 7 times higher in the MABr treated SC device. The results suggest a novel, feasible and efficient strategy to passivate surface defects for perovskite single crystals with improved properties.
研究领域:
材料科学
·
光电子学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Jiawei Wang,Peng Lu,Yunlong Shuai,Zhanbo Fan,Yunzhe Li,Xinyuan Li,Ruijin Hong,Chunxian Tao,Qi Wang,Hui Lin,Zhaoxia Han,Dawei Zhang
A series of CH3NH3PbBr3 (MAPbBr3) nanostructure-based films with various thicknesses on indium-tin-oxide (ITO)-covered substrates were fabricated by the spin-coating technique. The effects of ITO on the structure, surface morphology, and optical properties of MAPbBr3 thin films were investigated, respectively. Compared with monolayer MAPbBr3 thin films, the ITO buffer layer has the effect of improving the crystalline quality and preferential orientation of MAPbBr3 thin films, realizing the transition from reverse saturation absorption to saturation absorption. The tunability of nonlinear optical absorption was achieved by changing the thickness of the MAPbBr3 film. The maximum three-photon absorption coefficient of the monolayer MAPbBr3 film was 7.35 × 10–14 cm3/W2. The maximum third-order nonlinearity coefficient of MAPbBr3/ITO composite film was −1.04 × 10–5 cm/W. In addition, the finite-difference time-domain simulation results were in good agreement with the experimental results. These results indicate that the synthesized MAPbBr3 nanostructure-based films have potential applications in nonlinear optical devices.
研究领域:
材料科学
·
光学
·
物理化学
✓ 已验证
DOI
高影响因子
PHYSICA SCRIPTA
·
2020
·Vol. 95
·期 10
·105705
·
IF 1.985
Xiaoyong Gao,Xin Zhang
Compositional stability of perovskites is crucial for perovskite solar cells (PSCs) application because of directly affecting the performance of PSCs. Highly crystallized perovskite MAPbBr3 (MA = CH3NH3) with micronscale crystallites are usually fabricated via the one-step sol-gel process that uses strongly coordinating organic solvents. The two-step sol-gel process using weakly coordinating organic solvent is rarely used to fabricate MAPbBr3 films with relatively small crystallites. However, the two-step sol-gel process is preferred to fabricate PSCs because the residual PbBr2 can prevent the direct contact between electron- and hole-transporting layers. Thus in this work, perovskite MAPbBr3 films are fabricated via two-step sol-gel process using weakly coordinating isopropanol solvent. The compositional stability in dry ambient air and related optical properties of the films are intensively studied by a technique of post-annealing. A compositional transition from MAPbBr3 to PbBr2 occurs with increase of post-annealing temperature (Tpa). The product PbBr2 begins to form in the MAPbBr3 films at approximately 130 °C Tpa, and MAPbBr3 is fully thermally degraded to PbBr2 at 170 °C Tpa. The compositional stability of the films in dry air is inherently determined by instable organic cations (MA)+ and small electronegativity of Br−. The perovskite film initially shows a redshifted and then a blueshifted optical absorption edge with increase of Tpa, which is due to the decrease in film tensile stress and to the enhancement in thermal degradation to PbBr2, respectively. The increase in number of PbBr2 particles and defects in the films remarkably reduces the intensity of the green emission of MAPbBr3.
研究领域:
材料科学
·
太阳能电池
·
光电子学
✓ 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）