ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Qing Xu,Tianwei Zhang,Mengjia Liu,Min Wang,Kun Cao,Rong Chen
Luminescent perovskite nanocrystals (NCs), possessing the advantages of low cost, easy detection, and excellent luminescence, are becoming more and more significant in the fields of information encryption and decryption. Most hydrochromic perovskite NCs for information encryption have moderate reversibility and are easily passively decrypted by water in the moist air, limiting their practical applications. Herein, a lyochromic material is synthesized based on reversible phase transition between luminescent CsPbBr3–HBr (pretreating CsPbBr3 with HBr) and nonluminescent Cs4PbBr6, exhibiting excellent reversibility in 50 cycles triggered by CsBr solution. HBr treatment boosts the ion migration of NCs via diminishing surface ligands and passivating Br vacancy, assisting CsBr concentration acting as a crucial factor in dynamic ion exchange equilibrium between the trigger solution and CsPbBr3–HBr. By utilizing CsPbBr3–HBr as a safety ink, the CsBr-triggered photoluminescence switch has been demonstrated to be reproducible, stable, and reliable for information encryption and decryption.
研究领域:
材料科学
·
光学
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产品关联
DOI
PubMed
高影响因子
Advanced Sensor Research
·
2024
·
IF 0
Wei Ye,Yaxin Li,Xinyu Zhao,Yaocheng Yang,Xin Wang,Dongqing He,Lu Li,Dongyan Tang,Tengling Ye
This study introduces a novel fluorescent light-up electrospun membrane, integrating PbBr 2 , which serves as an exceptionally selective probe for the detection of cesium ions (Cs + ). Leveraging the superior optical properties of CsPbBr 3 perovskite nanocrystals (PNCs), the researchers employ electrospinning technology to fabricate a test strip, namely PbBr 2 @polyacrylonitrile (PbBr 2 @PAN) nanofiber membranes, capable of swiftly detecting Cs + in water merely by observing changes in the nanocrystals' luminescence with the naked eye. By the introduction of NH 4 + -modified montmorillonite (NH 4 + -MMT), PbBr 2 -MT@PAN nanofiber membranes is obtained. The selectivity and sensitivity to Cs + can be further improved because NH 4 + -MMT endows PbBr 2 -MT@PAN nanofiber membranes with the hydrophilic property and selective adsorption toward Cs + ions. The membrane's fabrication is simple, scalable, and cost-effective, with high cesium selectivity and sensitivity down to 44 ppb. This innovation enables efficient, on-site cesium monitoring critical for environmental safety and nuclear waste management.
研究领域:
分析化学
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材料科学
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环境监测
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DOI
CRYSTENGCOMM
·
2024
·
IF 2.6
Yuanlong Sun,Yundong Ma,Xiangting Li,Ziyu Hu,Guozong Zheng
As a new generation of photoelectric materials, organic–inorganic halide perovskites have been widely used in photodetectors, solar cells and other fields, but most of the current mainstream applications are thin film materials. Compared with polycrystalline thin films, perovskite single crystals have fewer grain boundaries and relatively stable electron and hole transport, and are ideal materials for optoelectronic devices. To realize the controllable growth of CH3NH3PbBr3 (MAPbBr3) crystals, understand their growth mechanism, and reflect the inherent physical and chemical properties of the material, a new type of internal growth temperature control and external circulation cooling growth system was developed in this paper, which can accurately control the temperature change during crystal growth. The size of the grown MAPbBr3 single crystal reaches 62 × 58 × 23 mm3, which is the largest single crystal reported to date. The measured single crystal absorption cut-off edge, optical band gap, and carrier lifetime are superior to the traditional simple inverse temperature crystallization (ITC) method, which will help its deep applications in photovoltaics, optoelectronics, and X-ray imaging.
研究领域:
材料科学
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光电技术
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晶体生长
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Deying Kong,Yu Zhang,Dali Cheng,Enze Wang,Kaiyuan Zhang,Huachun Wang,Kai Liu,Lan Yin,Xing Sheng
Lead halide perovskite materials have been emerging as promising candidates for high-performance optoelectronic devices. Significant efforts have sought to realize monocrystalline perovskite films on a large scale. Here, we epitaxially grow monocrystalline methylammonium lead tribromide (MAPbBr3) films on lattice-matched gallium arsenide (GaAs) substrates on a centimeter scale. In particular, a solution-processed lead(II) sulfide (PbS) layer provides a lattice-matched and chemical protective interface for the solid–gas reaction to form MAPbBr3 films on GaAs. Structure characterizations identify the crystal orientations in the trilayer MAPbBr3/PbS/GaAs epistructure and confirm the monocrystalline nature of MAPbBr3 on PbS/GaAs. The dynamic evolution of surface morphologies during the growth indicates a two-step epitaxial process. These fundamental understandings and practical growth techniques offer a viable guideline to approach high-quality perovskite films for previously inaccessible applications.
研究领域:
材料科学
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光电材料
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晶体生长
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 48
·25696-25705
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IF 11.301
Yudi Wang,Xiya Yang,Wenkai Xu,Xueping Yu,Jialong Duan,Yanyan Duan,Qunwei Tang
Inorganic perovskites are regarded as “star” semiconductors with unique ferroelectricity due to their superior triboelectric behaviors to those of state-of-the-art dielectric polymers when applied in a triboelectric nanogenerator (TENG). An in-depth understanding on the charging mechanism of these inorganic halide perovskites may help design a robust TENG platform. Herein, alkali metal ion doped cesium lead tri-bromine Cs1−xAxPbBr3 (A = Li+, Na+, K+, and Ru+, x = 0–1) perovskites are systematically investigated concentrating on their triboelectric behaviors for the first time. The triboelectric charging affinities of these perovskites are ascertained by evaluating the electrical output performances and figures of merit of TENGs based on perovskite/poly(vinylidene fluoride) pairs in vertical contact-separation mode. Finally, a supplemented qualitative triboelectric series including Cs1−xAxPbBr3 perovskites is established regardless of the doping concentration, and can be utilized as a benchmark to guide the future dielectric selection for robust TENGs. This study not only casts light on the determination of an expanded triboelectric series, but also provides new insights into inorganic perovskites in the application of mechanical energy harvesting.
研究领域:
材料科学
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能源技术
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产品关联
DOI
高影响因子
Materials Today Communications
·
2020
·
IF 2.678
Ting Zhang,Chunli Jiang,Rong Luo,Ruijuan Qi,Mengqin Liu,Chunhua Luo,Hechun Lin,Hui Peng
Luminescent (trimethylbromomethyl) ammonium lead tribromide ((TMBM)PbBr 3 ) nanocrystals are synthesized by a green single-step mechano-grinding method in large scale. The photoluminescence quantum yield (PL QY) of the obtained (TMBM)PbBr 3 nanocrystals is 2.61 %. The luminescence of the nanocrystals can be significantly enhanced by introducing water or methanol during the grinding process. The maximum PL QYs of 7.65 % and 4.69 % are obtained for the nanocrystals prepared by the addition of water and methanol, respectively. The emission light of (TMBM)PbBr 3 nanocrystals can be tuned by the doping of chloride ion.
研究领域:
材料科学
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光学
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产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Yu-Qi Sun,Jie Wang,Guang-Zhe Ma,Dong Shi
Photoluminescence is informative to other optoelectronic processes that are less directly accessible in metal halide perovskites . In this study, we conducted optical studies on CH 3 NH 3 PbBr 3 single crystals with robust cubic lattices and atomically flat surfaces. Inter-band luminescence peaking aside from the absorption cutoff was observed, and its shifts toward shorter wavelength upon cooling. Cooling the crystal below 150 K leads to the occurrence of mid-gap luminescence partly at the expense of the inter-band luminescence, which indicates bulk photoluminescence quenching by trap-mediated electronic trapping and subsequent mid-gap radiation following electronic de-trapping. Time-resolved photoluminescence probed at the mid-gap luminescence maxima shows two-stage mono-exponential traces, directly corroborating the trapping and de-trapping processes. In the presence of mid-gap luminescence at low temperatures, time-resolved inter-band luminescence demonstrates triplet decaying pathways, in sharp contrast to the doublet decaying pathways at higher temperatures in the absence of mid-gap luminescence. Time- and temperature-resolved inter-band photoluminescence gave rise to a characteristic photocarrier lifetimes evolution against temperature in a close analogy to the material's dielectric constant .
研究领域:
材料科学
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光学
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产品关联
DOI
高影响因子
Advanced Photonics Research
·
2021
·Vol. 3
·期 1
·2100198
·
IF 0
Lu Cao,Jie Wang,Jia-Rui Rao,Guang-Zhe Ma,Min Gao,Dong Shi
Metal halide perovskites (MHPs) are attracting ever-growing interest across diverse optoelectronic subdisciplines. Yet, the physical mechanism underlying photoexcitation and subsequent photocarrier dynamics remains poorly understood, due to the apparent spectroscopic diversities observed for any certain MHP. Here, diverse spectroscopic characteristics, including static spectral line-shapes and time-resolved photoluminescence (TRPL) traces shown by polycrystalline versus single-crystalline CH 3 NH 3 PbBr 3 perovskites, are restudied. Key photophysical merits, including exciton binding energy ( E B ), Sommerfeld factor ( ξ ), and Urbach energy ( E U ) that account for the diversities, are discussed within the established framework of semiconductor optics. The value of ξ , which increases with E B , determines how much the interband absorption is enhanced beyond that expected for free carriers. The intrinsic band-edge luminescence is identified, with its asymmetric spectral line-shape linked to E U via the van Roosbroeck–Shockley relation. Excited phase evolution, accompanied by rapid electron–hole (e–h) pairs dissociation and subsequent occurrence of e–h plasma, is indicated by the two-stage TRPL traces that are only observable for high-quality single crystals. With all the spectroscopic analysis and interpretations rooted in the established semiconductor optical theorems, the mechanistic merits revealed in this study are informative for plausible identification between the interband and excitonic photophysical processes of MHPs.
研究领域:
材料科学
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光学
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产品关联
DOI
ACS Applied Energy Materials
·
2024
·
IF 5.4
Tingyan Huang,Yu Zhang,Jia Sun,Yinsheng Gu,Fang Wang,Ying-Wei Lu,Paifeng Luo
In recent years, there has been some interest in the use of chemical vapor deposition (CVD) for the fabrication of perovskite solar cells (PSCs) due to its satisfactory film-quality, high controllability and consistency, low equipment cost, and easy industrial scale-up. In this paper, the mixed-cation MAxFA1–xPbI3–yBry perovskite light absorbing films were first deposited via a lead bromide (PbBr2) precursor doped CVD process, and the effect of bromine content on its material phase composition, film morphology, optical band gap, device photovoltaic characteristic, charge recombination, and carrier transport property were systematically studied. The experimental results show that introducing an appropriate PbBr2 doping amount can inhibit the formation of undesirable nonphotoactive γ phase, which enhances the crystallization ability, increases the grain size and material band gap of perovskite films, and then suppresses the carrier recombination, reduces the contact resistance, and facilitates the carrier extraction and transport at the interface. This ultimately leads to an improvement in the power conversion efficiency (PCE) and stability of the PSCs. Consequently, the optimized MAxFA1–xPbI3–yBry PSCs with 0.05 M PbBr2 doping achieve an impressive PCE of 17.94%, which is significantly higher than that of the undoped devices (16.69%) and reaches the high level of PSCs with a hybrid chemical vapor deposition (HCVD) method.
研究领域:
材料科学
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太阳能电池技术
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化学工程
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产品关联
DOI
高影响因子
ACS Applied Optical Materials
·
2025
·
IF 3.8
Hui-Lian Zhou,Ya-Yang He,Yong Wang,Cheng-Yang Zhou,Hong-Wei Hu,Yun Zhang,Guang-Gui Cheng
All-inorganic lead bromide perovskite CsPbBr3 has garnered considerable attention due to its high thermal stability and rapid radiative recombination. Unfortunately, it is still a big challenge to further improve the efficiency and stability of the CsPbBr3 film via the solution processing technique. In this study, we report a method to enhance the CsPbBr3 film quality via annealing at a low temperature of 38 °C. The low-temperature annealing slows the phase transition, allowing for the orderly arrangement of crystal orientations and a surface with fewer defects. With this method, the fabricated CsPbBr3 PeLED exhibits great stability and bright luminescence, achieving an external quantum efficiency (EQE) of 8.21%. The PeLEDs fabricated at 38 °C demonstrated a low turn-on voltage of 1.5 V, with high current densities of 66.8 mA/cm2 at 2.0 V and 371 mA/cm2 at 3.0 V. These results provide valuable insights for the realization of high-efficiency and high-stability PeLEDs for lighting and display applications.
研究领域:
材料科学
·
光电工程
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产品关联
DOI
高影响因子
ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES
·
2015
·Vol. 70
·期 9
·617-623
·
IF 0.744
Gao-Feng Wang,Xiao Zhang,Shu-Wen Sun,Chen-Zhong Yao,Zhao-Rong Liu,Yu-Chun Wang,Yuan-Zhong Liu
A new copper(II)/lead(II) complex [(terpy) 3 CuPb 5 Br 12 ] ( 1 ) (terpy = 2,2′:6′,2″-terpyridine) has been synthesized and characterized by IR, elemental analysis, and single-crystal X-ray diffraction analysis. The copper(II) and lead(II) ions in the title complex are in distorted six- (Cu(II), Pb(II)) and eight-fold (Pb(II)) coordination environments, in which the donor atoms are provided by bromide anions and nitrogen atoms of the 2,2′:6′,2″-terpyridine ligands. Complex 1 contains [(terpy) 4 Pb 9 Br 20 ] 2– building blocks. These bromoplumbate(II) clusters are connected by (terpy) 2 Cu 2 Br 4 units along the crystallographic b axis and by PbBr 6 units along the a axis, thereby forming an extended sheet structure.
研究领域:
无机化学
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材料科学
·
晶体学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2022
·Vol. 13
·期 1
·1-10
·
IF 17.694
Zhang Pingping,Yang Gaoling,Li Fei,Shi Jianbing,Zhong Haizheng
Photolithography has shown great potential in patterning solution-processed nanomaterials for integration into advanced optoelectronic devices. However, photolithography of perovskite quantum dots (PQDs) has so far been hindered by the incompatibility of perovskite with traditional optical lithography processes where lots of solvents and high-energy ultraviolet (UV) light exposure are required. Herein, we report a direct in situ photolithography technique to pattern PQDs based on the photopolymerization catalyzed by lead bromide complexes. By combining direct photolithography with in situ fabrication of PQDs, this method allows to directly photolithograph perovskite precursors, avoiding the complicated lift-off processes and the destruction of PQDs by solvents or high-energy UV light, as PQDs are produced after lithography exposure. We further demonstrate that the thiol-ene free-radical photopolymerization is catalyzed by lead bromide complexes in the perovskite precursor solution, while no external initiators or catalysts are needed. Using direct in situ photolithography, PQD patterns with high resolution up to 2450 pixels per inch (PPI), excellent fluorescence uniformity, and good stability, are successfully demonstrated. This work opens an avenue for non-destructive direct photolithography of high-efficiency light-emitting PQDs, and potentially expands their application in various integrated optoelectronic devices.
研究领域:
材料科学
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光电技术
·
纳米技术
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）