Nanomaterials
·
2025
·Vol. 16
·期 1
·
IF 4.3
Zijun Yu,Chen Zou,Dexin Yang
Cesium lead chloride (CsPbCl3) is a stable, wide-bandgap perovskite with significant potential for ultraviolet (UV) photodetection and blue light-emitting diodes (LEDs). However, the dynamical mechanisms of ferroelastic domain walls associated with the dielectric relaxations in a single-crystal have rarely been reported. In this work, we observed reversible phase transitions from cubic to tetragonal, and further to orthorhombic symmetry, accompanied by the formation and evolution of strip-like ferroelastic domain walls, using in situ X-ray diffraction (XRD), differential scanning calorimetry (DSC), polarized optical microscopy (POM), and dielectric measurements. Notably, the dielectric studies revealed low temperature (~170–180 K) frequency-dependent loss peaks that we attribute to the pinning of polarized domain walls by chloride vacancies. We also found that the formation or disappearance of ferroelastic domain walls near the octahedral tilting transition temperatures leads to pronounced anomalies in the dielectric permittivity. These findings clarify the intrinsic phase behavior of CsPbCl3single crystals and underscore the significant contribution of ferroelastic domain walls to its dielectric response, providing insights for optimizing its optoelectronic performance.
研究领域:
材料科学
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凝聚态物理
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钙钛矿光电子学
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铁性材料
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介电性能
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PubMed
高影响因子
CARBON
·
2026
·
IF 12.7
Weiwei Yu,Shulan Jiang,Siying He,Ziqin Ai,Zhe Liu,Guipeng Li,Qingling Zhu,Tiantian Wen,Kechun Wen,Zirong Tang,Xiaobin Zhan,Xiuguo Chen
Synergistic interaction between vapor-deposited CsPbCl 3 perovskite and CNT optimizes field emission and long-term stability. • The work function of CNT is reduced to 4.28 eV, significantly enhancing electron tunneling efficiency. • CsPbCl 3 suppresses current concentration at the CNT, ensuring the integrity and stability of the emission structure. • The introduction of additional emission sites significantly increases the field emission current to 50 mA. In the field of vacuum microelectronics, carbon nanotube (CNT) used as field emission cathode faces many challenges, including high driving electric field and poor stability of CNT tips. As a result, relying solely on CNT is insufficient to meet the application requirements of high-performance cold cathode. In this study, we introduced CsPbCl 3 perovskite and utilized its excellent intrinsic optoelectronic properties in conjunction with CNT for field emission. CsPbCl 3 was grown on the surface of CNT film through continuous vapor deposition to form CNT/CsPbCl 3 heterojunction. This heterojunction offers three synergistic advantages, it effectively reduces the work function of CNT, introduces additional electron emission sites and provides physical protection for the CNT. Experimental results show that HF60 sample exhibits significantly improved field emission performance, with the turn-on field and threshold field of 2.11 V/μm and 2.35 V/μm respectively, the field enhancement factor reaching 5897 and the maximum emission current exceeds 50 mA. Simultaneously, the current fluctuation rate was only 4% in 10 h lifespan test, demonstrating reliable long-term stability. Furthermore, we employed DFT calculations to deeply analyze the interface electron regulation mechanisms of the CNT/CsPbCl 3 heterojunction, providing a theoretical explanation for the enhanced field emission performance. This study offers a novel and effective technology approach for the fabrication of high-performance field emission cathode. Download: Download high-res image (381KB) Download: Download full-size image
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Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 37
·10101-10105
·
IF 5.976
Xiangtong Zhang,Yu Zhang,Xiaoyu Zhang,Wenxu Yin,Yu Wang,Hua Wang,Min Lu,Zhiyang Li,Zhiyong Gu,William W. Yu
Lead halide perovskite nanocrystals (NCs) exhibit excellent tunable emissions covering the entire visible spectral region, but they do not emit near-infrared (NIR) light. We synthesized rare earth element doped CsPbCl3 NCs for NIR emission. The Yb3+ doped CsPbCl3 NCs emitted strong 986 nm NIR light; the Yb3+/Er3+ co-doped CsPbCl3 NCs emitted at 1533 nm. The total photoluminescence quantum yield (PL QY) of the CsPbCl3 NCs changed from 5.0% to 127.8% upon incorporating 2.0% Yb3+, a factor of 25.6 times enhancement. The material's stability was tested under continuous ultraviolet (365 nm) irradiation. The doped CsPbCl3 NCs exhibited a better stability than the undoped one. The PL intensity of the undoped CsPbCl3 NCs dropped to 20% of the initial value in 27 h, while the doped one took 85 h.
研究领域:
材料科学
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纳米技术
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光电子学
·
光子学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xiaochen Fang,Biao Zheng,Mengyu Ding,Yingzhi Ye,Wei Xu,Meishan Han,Jiajia Lu,Bingwen Zhang,Jinquan Hong,Hai Huang,Xiaolong Liu,Jun Wang,Zhanhui Yuan
All-inorganic perovskite nanocrystals (NCs) exhibit great promise in optoelectronics and photovoltaics. However, their intrinsic low-thermal/oxygen/moisture stability and the rigorous synthesis procedures have limited the practical applications. Here, we present a facile, one-step, light-induced method to synthesize CsPbCl 3 :Mn 2+ NCs at room temperature by using carbon tetrachloride (CCl 4 ) as the halide source. The corresponding formation mechanism of CsPbCl 3 :Mn 2+ NCs is revealed, where CsPbCl 3 :Mn 2+ NCs are formed through the direct incorporation of [MnCl 6 ] 4− octahedral into the perovskite lattice during the nucleation and growth process. Additionally, we demonstrate the in-situ growth of CsPbCl 3 :Mn 2+ NCs within mesoporous silica (mSiO 2 ) spheres to form CsPbCl 3 :Mn 2+ @mSiO 2 nanocomposites via the light-induced method, resulting in a remarkable improvement in high-temperature and long-time stability. As a prototype experiment, a white light-emitting diode (WLED) device is constructed using CsPbCl 3 :Mn 2+ @mSiO 2 nanocomposites, which exhibits a bright white-light emission with the CIE chromaticity coordinate of (0.352, 0.340). It is anticipated that light-induced synthesis method provides a straightforward strategy for synthesizing multifunctional halide perovskite nanocrystals and nanocomposites for versatile applications.
研究领域:
材料科学
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光学工程
·
纳米技术
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高影响因子
Journal of Physical Chemistry C
·
2020
·
IF 4.189
Yubin Zhao,Xiao Zhang,Cong Xie,Wenbin Shi,Ping Yang,San Ping Jiang
Although inorganic cesium halide lead perovskite nanocrystals (NCs) exhibited tunable photoluminescence (PL), it is still a challenge for such NCs with multicolor and white emission for application. In this article, as-synthesized Mn:CsPbCl3 NCs were treated using an oleoamine solution of CdX2 (X = Cl, Br) to get a high PL quantum yield (PLQY) and stability. CdCl2 passivated the surface defects of Mn:CsPbCl3 NCs through anion exchange to get high PL intensity, especially to increase Mn emission. The PLQY of the sample was increased from 15 to 85% after ion exchange. Furthermore, the treatment of CdBr2 resulted in the appearance of a powerful blue emission peak, and the PLQY increased to 95.7%. The PL decay kinetics of samples was studied before and after treatment. Mn2+ emission in Mn:CsPb(Cl/Br)3 NCs was increased because of the reaction of CdBr2 and Mn:CsPbCl3 NCs. Interestingly, the tunable and bright white emission from Mn:CsPb(Cl/Br)3 NCs was obtained by controlling the amount of Br. The controlling of Mn emission plays an important role in changing the Commission Internationale de l’Eclairage color coordinates. Because of bright and tunable PL, the NCs may be used in white-light-emitting diodes.
研究领域:
材料科学
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光学
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高影响因子
ADVANCED MATERIALS
·
2023
·Vol. 35
·期 25
·2300118
·
IF 29.4
Hongfei Li,Xiaoqi Liu,Donglei Zhou,Biao Dong,Lin Xu,Xue Bai,Hongwei Song
Erbium ions (Er 3+ , 1.54 µm) electric pumped light sources with excellent optical properties and a simple fabrication process are urgently desired to satisfy the development of silicon-based integration photonics. The previous Er-based electroluminescence devices are mainly based on Er-complexes or Er-doped oxide compounds, which usually suffer from low external quantum efficiency(EQE)or high applied voltage etc. In this work, a novel type of Er 3+ /Yb 3+ co-doped lead-halide perovskite films (Er 3+ /Yb 3+ :CsPbCl 3 ) with the maximum photoluminescence quantum yield of 30.12% are prepared by a simple two-step solution-coating method and the corresponding light emitting diodes (Er-PeLEDs) are fabricated, which demonstrate an almost pure 1.54-µm emission and a peak EQE up to 0.366% at a low applied voltage of 1.4 V. Strong negative thermal quenching effect may help Er-PeLEDs suppress Joule heating quenching. These excellent LED properties benefit mainly from the outstanding regulatory performance of acetate to perovskite films, the excellent semiconductor behavior and strong ionic property of the perovskite, and the involvement of Yb 3+ ions, which can directly and efficiently transfer the exciton energy to Er 3+ through a quantum cutting process. Overall, the realization of 1.54-µm Er-PeLEDs offers new opportunities for silicon-based integrated light sources.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Dayu Huang,Yuhang Zhang,Xingru Chen,Ziyong Cheng,Hongzhou Lian
The development of efficient and stable near—infrared (NIR) emitters using solution—processable materials remains a key challenge for flexible optoelectronics. This study addresses this need by constructing a novel ternary heterostructure through a room—temperature, sulfur—anion mediated transformation of CsPbCl 3 : Mn 2+ nanocrystals. Unlike conventional binary systems, this architecture enables a unidirectional energy cascade: from the CsPbCl 3 host to Mn 2+ emitters, and subsequently to the in—situ formed PbS domain, resulting in enhanced NIR emission. Systematic investigation reveals that optimal incorporation of C 6 H 18 SSi 2 is critical for modulating the heterointerface, which in turn opens a highly efficient energy transfer pathway. The resulting nanocomposite exhibits exceptional stability, retaining 95 % of its photoluminescence after six months under ambient conditions. Furthermore, the successful fabrication of flexible films with uniform electroluminescence underscores the practical potential of this heterostructure for next—generation optoelectronic devices.
研究领域:
材料科学
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纳米技术
·
光电子学
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钙钛矿纳米晶
·
能量转移
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高影响因子
Materials
·
2026
·Vol. 19
·期 8
·1479
·
IF 3.7
Jingwei Yang,Fangbao Wang,Liang Chen,Tao Bo,Zhifang Chai,Wenwen Lin
Large-sized, room-temperature ultrafast scintillator single crystals are highly demanded for fast timing applications such as time of flight–positron emission tomography, high-speed medical imaging, and pulse heavy-ray detection. Sub-nanosecond scintillation was discovered in 16 mm sized CsPbCl3Brxsingle crystals in our previous research. In this work, the crystal size of CsPbCl3Br0.03was enlarged to 2 inches (50.8 mm). Meanwhile, by precisely optimizing the vertical Bridgman growth process, we further increased the concentration of Br dopant to realize even faster scintillation decay. In this study, we conducted a series of tests on the grown crystals, including temperature-dependent photoluminescence tests, alpha particle excitation tests, X-ray imaging tests, etc. Via the strategy of the incorporation of Br2, Br dopant introduces highly efficient fast recombination centers in perovskite CsPbCl3Br0.03crystals, resulting in an unprecedently fast scintillation decay time of 303 ps under241Amα-particle excitation, which is significantly shorter than that of the pure CsPbCl3and all other perovskites by at least two orders of magnitude. Benefiting from the excellent optical transparency and high crystalline quality of the CsPbCl3Br0.03crystal, an X-ray spatial resolution of up to 20 lp/mm is achieved. These results further demonstrate the great potential of large-sized CsPbCl3Brxsingle crystals for fast timing applications.
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高影响因子
Journal of Physical Chemistry C
·
2021
·
IF 4.126
Jonathan M. Wong,Jie Xu,Ruizhong Zhang,Kenneth Chu,Zhifeng Ding,Lijia Liu
Electrochemiluminescence (ECL) of Mn-doped CsPbCl3 perovskite quantum dot (MPQ) films was investigated for the first time. The electrochemical properties of the perovskite quantum dots are probed by cyclic voltammetry and spooling ECL spectroscopy. It has been discovered that the ECL of the MPQ/benzoyl peroxide coreactant system proceeds through two channels: an energy transfer process from the band-edge exciton to Mn2+, producing emission centered at 595 nm from Mn2+ d–d transition, and a second emission peak centered at 660 nm, which is of a surface-state origin. This observation is drastically different from the frequently reported photoluminescence (PL) of MPQ, which contains dual emission from the host and the dopant, respectively. ECL of the undoped CsPbCl3 (UPQ) was also investigated, and the presence of the 660 nm peak further supports our proposed surface-state emission scheme.
研究领域:
材料科学
·
物理化学
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高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Daqin Chen,Su Zhou,Gaoliang Fang,Xiao Chen,Jiasong Zhong
Currently, it is of great challenge to achieve cation exchange in CsPbX3 (X = Cl, Br, I) perovskite nanocrystals (NCs) on account of rigid Pb2+ octahedral coordination protected by six halogen anions (PbX64–). Herein, we demonstrate that dynamic halogen exchange can effectively open up PbX64– octahedrons and enable fast Mn-to-Pb cation exchange at room temperature in a few seconds. Importantly, Cl concentration rather than Mn one is demonstrated to be a dominant factor for cation exchange, where different Mn2+/Cl– salts can be adopted as Mn/Cl sources and Cl-to-Cl or Cl-to-Br anion exchange is the necessary prerequisite. Such a facile synthesizing method can lead to the feasibility of tuning emissive colors for the Mn-doped CsPb(Cl/Br)3 NCs by controlling both cation and anion exchanges and open a new way to replace Pb2+ in CsPbX3 NCs by other nontoxic metal elements.
研究领域:
材料科学
·
化学
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PubMed
高影响因子
CHEMISTRY OF MATERIALS
·
2017
·
IF 9.466
Xi Yuan,Sihang Ji,Michael C. De Siena,Liling Fei,Zhao Zhao,Yunjun Wang,Haibo Li,Jialong Zhao,Daniel R. Gamelin
A series of Mn2+-doped CsPbCl3 nanocrystals (NCs) was synthesized using reaction temperature and precursor concentration to tune Mn2+ concentrations up to 14%, and then studied using variable-temperature photoluminescence (PL) spectroscopy. All doped NCs show Mn2+4T1g → 6A1g d–d luminescence within the optical gap coexisting with excitonic luminescence at the NC absorption edge. Room-temperature Mn2+ PL quantum yields increase with increased doping, reaching ∼60% at ∼3 ± 1% Mn2+ before decreasing at higher concentrations. The low-doping regime is characterized by single-exponential PL decay with a concentration-independent lifetime of 1.8 ms, reflecting efficient luminescence of isolated Mn2+. At elevated doping, the decay is shorter, multiexponential, and concentration-dependent, reflecting the introduction of Mn2+–Mn2+ dimers and energy migration to traps. A large, anomalous decrease in Mn2+ PL intensity is observed with decreasing temperature, stemming from the strongly temperature-dependent exciton lifetime and slow exciton-to-Mn2+ energy transfer, which combine to give a strongly temperature-dependent branching ratio for Mn2+ sensitization.
研究领域:
材料科学
·
纳米技术
·
光电子学
·
光物理
·
半导体纳米材料
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DOI
高影响因子
OPTICAL MATERIALS
·
2025
·
IF 4.2
Lan Fang,Dengfeng Luo,Jing Zhang,Fukang Wang,Jiayang Zhang,Zheheng Zheng,Zhiqun Xu,Guobin Huang
The commercial applications of lead halide perovskites are limited by their adverse environmental hazards and intrinsic instability. One promising strategy to mitigate the Pb 2+ content is the doping of X 2+ transition metal ions into cesium lead halide CsPbX 3 (where X = Cl, Br, I) perovskite nanocrystals (PNCs). In this study, an ultrafast high-power ultrasonic synthesis method is employed to ensure uniform nucleation and growth of co-doped (Zn, Mn): CsPbCl 3 PNCs. Various analytical techniques are utilized to investigate the phase purity, microstructure, chemical composition, and photo-luminescence properties of the co-doped PNCs. Density functional theory (DFT) calculations reveal that the significantly enhanced optical performance of co-doped (Zn, Mn): CsPbCl 3 PNCs is primarily due to the increased formation energy resulting from the successful incorporation of Zn 2+ into Mn-doped CsPbCl 3 PNCs, without introducing new defect states. Additionally, the co-doped (Zn, Mn): CsPbCl 3 PNCs exhibit high sensitivity and selectivity in detecting Cu 2+ ions. Our findings propose a novel approach for tuning the optical properties of co-doped (Zn, Mn): CsPbCl 3 PNCs, highlighting their potential for applications in fluorescence sensors.
研究领域:
材料科学
·
光学
·
环境科学
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高影响因子
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