CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Shuaiqi Zhao,Xiaolei Yang,Yumeng Ge,Hongbin Zhang,Jie Li,Keyu Han,Shiqing Xu,Gongxun Bai
The all-inorganic perovskite nanocrystals are promising luminescent materials for optoelectronic devices. However, it is still a challenge to prepare perovskite nanocrystals with high luminescence. Herein, a synthesis method was developed for the uniform incorporation of ultra-thin BiOBr nanosheets into perovskite crystals at both body-embedding and surface-passivating positions. The micron-scale green-emitting phosphors composed of Cs 4 PbBr 6 nanocrystals and BiOBr nanosheets are prepared. The crystal structure of Cs 4 PbBr 6 nanocrystals can remain almost unchanged although prepared from different PbBr 2 concentrations. The luminescence mechanism of Cs 4 PbBr 6 is discussed. The Cs 4 PbBr 6 @BiOBr submicron phosphors can be dispersed in DMSO solvent without disintegration and dissolution, which are used as seeds of the CsPbBr 3 film growth. The CsPbBr 3 films with Cs 4 PbBr 6 @BiOBr doped exhibit pure optical characteristics of CsPbBr 3 , indicating that Cs 4 PbBr 6 is converted to CsPbBr 3 during the film preparation process. Furthermore, these Cs 4 PbBr 6 @BiOBr phosphors are mixed with CaAlSiN 3 : Eu red-emitting commercial phosphors to make white LEDs (WLEDs). Overall, this study provides a revealing insight into a kind of composite material constructed with halide perovskite and bismuth halide oxide.
研究领域:
材料科学
·
光学工程
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Tianqing Sheng,Shuqin Zhang,Xuguang Wei,Xinran Lv,Zhigang Yang
The porous Ti/perovskite composites were prepared successfully by ultrasound-assisted infiltration method. The Cs–Pb–Br perovskite materials were prepared on a larger scale by the mechanical ball-milling using the CsBr and PbBr 2 as the precursors. The Cs–Pb–Br perovskites had high PL intensity and excellent stability, meanwhile, the complex phase transformation between CsPbBr 3 and Cs 4 PbBr 6 occurred during the ball-milling process. The green fluorescence emission of composites might be attributed to CsPbBr 3 embedded within Cs 4 PbBr 6 perovskite. By the space occupying method, the porous Ti materials were prepared by using the acicular urea as the pore forming. The optimal young's modulus (1.0851 GPa) and porosity (38.27 %) were obtained. Finally, the prepared Ti/perovskite composites had outstanding fluorescence property and high stability, showing the wide application prospect in the fields of the bioflourescence imaging and nondestructive testing fields.
研究领域:
材料科学
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光学
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生物医学工程
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DOI
高影响因子
Nanoscale
·
2020
·Vol. 12
·期 17
·9727-9732
·
IF 6.895
Qiang Xu,Juan Wang,Wenyi Shao,Xiao Ouyang,Xiang Wang,Xinlei Zhang,Yong Guo,Xiaoping Ouyang
Low dimensional scintillators have been successfully and widely applied in the radiation-detection community for home security, scientific research, and imaging. We have grown zero-dimensional Cs4PbBr6 materials with CsPbBr3 nanocrystals embedded by using a solution-growth method at low temperature. We have demonstrated the scintillation properties of these 0D nanoscintillators with high luminescence quantum efficiency for green light. In addition, we have successfully achieved pulse height spectra with this 0D perovskite material, which has been demonstrated with fast decay time (<10 ns), high energy resolution (3.0 ± 0.1%, 59.5 keV from 241Am), high light yield (64 000 photons per MeV) and long term stability under various atmospheres (moisture, radiation). These results are much better than those of the most widely used commercial products such as NaI(Tl). It also demonstrates that this 0D all-inorganic material can be employed as a scintillator for ionization radiation applications such as X-ray imaging and spectroscopy applications.
研究领域:
材料科学
·
辐射探测技术
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PubMed
高影响因子
ACS Photonics
·
2024
·
IF 6.5
Xiaoting Wang,Qianxi Yin,Rongrong Xu,Yu Gu,Xianliang Huang,Mulin Li,Teng Ma,Ziyi Chen,Jun Chen,Haibo Zeng
Birefringent crystals have the ability to modulate polarized light, which has important applications in the field of optoelectronics. Waveplates are important devices in polarization optics to modulate the polarization and phase delay of light over a wide band of wavelength. However, conventional designs of half-wave plates and quarter-wave plates involve multiple birefringent crystals, and the fabrication process is complex and costly. Here, we report the discovery of a multiwavelength (532–785 nm) temperature-controlled phase modulator based on Cs4PbBr6/CsPbBr3 perovskite crystals. It is the crystal lattice expansion that is causing the variation of the birefringence factor of Cs4PbBr6/CsPbBr3 through observing crystal optical properties. The transmitted 633 nm light can be temperature-modulated to achieve the switching of optical polarization states between circularly polarized and linearly polarized states, revealing that the same crystal can switch between the functions of half-wave plates and quarter-wave plates. Other wavelengths of transmitted light can also change optical polarization states through temperature control. Given the versatility of halide perovskite-based crystals, Cs4PbBr6/CsPbBr3 crystals offer a promising approach for producing waveplates and other optical devices at a lower cost.
研究领域:
光学
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材料科学
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高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 33
·11931-11937
·
IF 8.067
Hong Zhu,Yuexiao Pan,Hongzhou Lian,Jun Lin
Bulk zero-dimensional (0D) rhombohedral perovskite Cs4PbBr6 crystals grown into microsized ones exhibit bright green photoluminescence (PL) ranging from 510 to 530 nm and have attracted much attention due to their potential applications in photovoltaic and white light-emitting diodes (WLEDs). Here, we report blue luminescence of Cs4PbBr6 nanosized crystals (NCs) (∼3 nm) at 467 nm in highly volatile acetone (CP) solution in the presence of organic amines with carbon chain lengths ranging from 4C to 8C at room temperature. Subsequently, the Cs4PbBr6 NCs gradually grew into microsized crystals (MCs) (∼2 μm) and the emission wavelength shifts to 515 nm within 40–100 min. This is attributed to the evaporation of organic amines along with CP on the surfaces of Cs4PbBr6 crystals. The final grown Cs4PbBr6 MCs are free of any ligands with photoluminescence quantum yields (PLQYs) up to 93.3% and show a superior moisture resistance. The spontaneous growth of ligand-free Cs4PbBr6 crystals spans from the nanometer to the micrometer scale and causes changes in quantum confinement for fundamental new insights into the crystal growth dynamics of the perovskites and exhibits promising applications in WLEDs.
研究领域:
材料科学
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光学
·
化学
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DOI
高影响因子
RARE METALS
·
2026
·Vol. 45
·期 1
·e70133
·
IF 12.1
Junqing Xiahou,Tiancheng Xu,Xiangyu Liu,Siyi Xu,Yishui Liu,Sai Huang,Yizhong Lu,Zongming Liu,Jinkai Li
en This link goes to a English section zh This link goes to a Chinese section Although halide perovskite nanocrystals exhibit excellent photoelectric properties, their inherent instability greatly limits their practical applications. Here, we report a novel self-assembly strategy to synthesize highly stable CsPbBr 3 @Cs 4 PbBr 6 perovskite fluorescent nanomaterials in a single step by using 4,4′-azo (4-cyanoglutaric acid, CA) and oleylamine (OAm) as ligands, with HBr introduced during the preparation process to create a Br-rich reaction environment. Specifically, the ligands CA and OAm are anchored to the surface of the composite and then effectively improve their optical properties. Interestingly, because of the protective effect of Cs 4 PbBr 6 , the as-synthesized CsPbBr 3 @Cs 4 PbBr 6 micromaterials demonstrate excellent solution stability, photostability, and thermal cycling stability. Moreover, the combined effects of the reduction in particle size of CsPbBr 3 @Cs 4 PbBr 6 and the decomposition of CsPbBr 3 into CsBr and PbBr 2 are found to induce an initial increase and subsequent decrease in its luminescence intensity in polar media. The as-synthesized perovskite luminescent materials, when combined with Gd 2 O 3 :Eu red phosphor and Ba 2 Sr(PO 4 ) 2 :1% Eu 2+ blue phosphor, form a white light-emitting diode (WLED) device that exhibits outstanding luminous properties. This work not only provides a novel approach for the stable synthesis of perovskite luminescent nanoparticles but also lays a foundation for their application in LED technologies. 摘要 en This link goes to a English section zh This link goes to a Chinese section 尽管卤化物钙钛矿材料具有出优异的光电性能,但其固有的不稳定性极大地限制了它们的实际应用。在此,本研究创新性地采用自组装策略,使用4-氰基戊二酸(CA)和油胺(OAm)作为配体,并在制备过程中引入HBr以创建富溴反应环境,通过一步法合成高稳定性的CsPbBr 3 @Cs 4 PbBr 6 钙钛矿发光材料。具体而言,配体CA和OAm锚定在复合材料表面,从而有效改善了它们的光学性能。有趣的是,由于Cs 4 PbBr 6 的保护作用,所合成的CsPbBr 3 @Cs 4 PbBr 6 微材料表现出优异的溶液稳定性、光稳定性和热循环稳定性。此外,研究发现,CsPbBr 3 @Cs 4 PbBr 6 粒径的减小和CsPbBr 3 分解为CsBr和PbBr 2 的共同作用,导致其在极性介质中的发光强度先增加后减少。所合成的钙钛矿发光材料与Gd 2 O 3 :Eu红色荧光粉和Ba 2 Sr(PO 4 )2:1% Eu 2+ 蓝色荧光粉结合,形成了一种白光发光二极管(WLED)器件,该器件展现出突出的发光性能。这项工作不仅为钙钛矿发光纳米颗粒的稳定合成提供了一种新方法,而且为其在LED技术中的应用奠定了基础。
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Zhigang Yang,Shuqin Zhang,Junshuai Chen,Tianqing Sheng,Xinran Lv,Xuguang Wei,Guoqiang Qin,Gang Yu
Owing to inherent structural instability of perovskite quantum dots, they are instability in humid environments and high temperatures conditions. To address this issue, a simple, environmentally friendly glass encapsulated technology is used to protect the perovskite quantum dots. Meanwhile, the dual-phase perovskite structure realized by phase transition engineering can further increase the stability of perovskite quantum dots. In this study, 3D CsPbBr 3 /0D Cs 4 PbBr 6 dual-phase coexisting perovskite quantum dot glass powders were synthesized through melt quenching and subsequent crystallization induction of thermal treatment and water molecule, respectively. Results showed that compared with thermal treatment induction, perovskite QDs glass powders by water molecules induction exhibited a high PLQY of 24.7 % with a central wavelength of 519 nm and displayed excellent environmental stability. By combining green fluorescence from 3D CsPbBr 3 /0D Cs 4 PbBr 6 QDs glass powders and red fluorescence powders (CaAlSiN 3 :Eu), a WLED device with an impressive EQE of 20.6 % was created, indicating a promising application potential.
研究领域:
材料科学
·
光学工程
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DOI
高影响因子
Advanced Optical Materials
·
2026
·
IF 7.2
Zichen Zhao,Kai An,Jiefu Tan,Bo Hu,Kaihang Wang,Qianqian Wang,Feng Ding,Muzhi Cai,Desui Chen,Junjie Si,Zugang Liu
Metal halide perovskites are promising materials for next-generation light-emitting diodes (LEDs) owing to their excellent optoelectronic properties and low-cost solution processability. The efficiency and operational lifetime of perovskite LEDs (PeLEDs) are strongly governed by the crystal quality of perovskite emitters. Among the various factors influencing perovskite crystallization, the surrounding solvent vapors, particularly ambient moisture, can significantly modify both the initial-stage nucleation and the subsequent post-deposition structural evolution. However, current moisture treatments are highly engineering-driven, and the fundamental mechanisms underlying the impacts of moisture on perovskite remain unclear. This work systematically investigates how moisture treatment with controllable humidity modifies the structural and optoelectronic properties of CsPbBr 3 films. Moisture induces the rapid formation of Cs 4 PbBr 6 and promotes continuous crystal growth of CsPbBr 3 , resulting in alterations to the film composition, defect landscape, and grain-boundary characteristics that strongly affect carrier recombination and ion migration behaviors. Consequently, we achieve a champion device efficiency exceeding 20% after short-term moisture exposure, and a half-lifetime of 220 min at an initial luminance of 10 000 cd m −2 under prolonged moisture treatment. This work provides mechanistic insight into moisture-driven film evolution and demonstrates that the moisture treatment offers an effective strategy to enhance the performance of PeLEDs.
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高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Qiangshuai Wang,Sengui Liang,Jinshuo Liu,Yuanyuan Xie,Qi Pang,Zhao-Qing Liu,Yibo Chen
Photocatalytic conversion of carbon dioxide (CO2) to carbon-based fuels is a promising approach to alleviating environmental and energy problems. Therefore, designing photocatalysts with morphological structures that favor gas–solid reactions and exhibit exceptional catalytic efficiencies is strongly demanded. In this work, a porous-framed heterostructure, constructed by anchoring Cs4PbBr6 perovskite nanocrystals on MnO2 hollow spheres, exhibits a 1.8-fold enhancement in the total electron consumption rate (95.3 μmol g–1 h–1) for CO2 photoreduction compared to the original Cs4PbBr6 nanocrystals. Detailed optoelectronic characterizations and theoretical calculations demonstrate that the electronic interactions in the heterointerface trigger disproportionation of Mn and help to expose active Mn sites that attract electrons, thus improving the CO2 activation and the following hydrogenation step to produce COOH*. The open and through porous structure also contributes to the enhanced reaction rate by accelerating mass transfer during the photoreduction reaction. This study provides valuable insights for the development of efficient catalysts for CO2 photoreduction in gas–solid reactions.
研究领域:
材料科学
·
环境科学
·
化学工程
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Enrou Mei,Yanling Lin,Xiaojuan Liang,Weidong Xiang
In this work, CsPbBr3/Cs4PbBr6@glass composites were synthesized by incorporating lead carbonate (PbCO3) into a lithium–aluminum–silicate–boron (Li–Al–Si–B) glass matrix. PbCO3 decomposes to PbO, which reacts in situ with melt Br to form PbBr2, triggering CsPbBr3/Cs4PbBr6 nucleation in Br-rich microdomains; CO2 release concurrently creates stress-relieving micropores, outperforming direct PbBr2 addition. This composite exhibited remarkable photoluminescence properties, with a photoluminescence quantum yield (PLQY) reaching as high as 86.71%. In an accelerated aging experiment conducted over 120 h, the fluorescence intensity was maintained at 95% of its original value. Even after 60 days of immersion in water, the luminescence intensity remained at 94% of the initial intensity, demonstrating its outstanding resistance to environmental degradation. To further explore its potential for display applications, we prepared a CsPbBr3/Cs4PbBr6/CsPbBrI2@glass@polystyrene (PS) film. This film exhibited an impressive color gamut, covering 123% of the National Television System Committee (NTSC) 1953 standard and 91.3% of the ITU-R Recommendation BT.2020 (Rec.2020) standard. The high PLQY and excellent stability of CsPbBr3/Cs4PbBr6@glass make it highly suitable for LCD applications and offer broad prospects for industrial-scale production.
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PubMed
高影响因子
Frontiers in Chemistry
·
2020
·
IF 3.693
Qiu Ping,Wang Qiuhe,Zhao Yizhou,Dai Yi,Dong Yuanyuan,Chen Changli,Chen Qi,Li Yujing
The halide perovskite (PVSK) material, an excellent light absorber with fast carrier kinetics, has received increased attention as a potential photocatalyst for organic synthesis. Herein, we report a straightforward synthesis of chemically modified halide perovskite and its application as an efficient photocatalyst to convert styrene into benzaldehyde. A simple method is employed to synthesize the chemically modified CsPbBr3/Cs4PbBr6 nanosheets by using ZrCl4 to simultaneously achieve the Cl doping and the surface modification with Zr species. The photocatalytic oxidation rate of styrene to benzaldehyde catalyzed by surface-modified CsPbBr3/Cs4PbBr6 nanosheets under visible light can reach 1,098 μmol g−1 h−1, 2.9 times higher than that of pristine CsPbBr3/Cs4PbBr6 nanosheets (372 μmol g−1 h−1). The enhanced photocatalytic performance may originate from the modified band structure induced by the synergistic effect of Cl doping and surface modification, whereby the same methodology can be applied to MAPbBr3. This work demonstrates the surface modification of PVSK materials and their potential as efficient photocatalyst toward organic synthesis.
研究领域:
材料科学
·
有机合成
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DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2021
·
IF 4.126
Xiaomei Chen,Mu He,Sheng Huang,Lei Zhang,Haizheng Zhong
Here, we fabricated Cs-rich and Pb-rich Cs4PbBr6 samples with green photoluminescence emission and investigated the difference between them. Both Cs-rich and Pb-rich Cs4PbBr6 samples show strong green emissions at about 520 nm; however, the photoluminescence excitation properties of the green emission are greatly different from each other in the ultraviolet region. The photoluminescence excitation spectra of the Cs-rich sample have a broad excitation band from 334 to 500 nm. In comparison, the Pb-rich sample has two additional excitation bands of 250–300 and 324–334 nm. By correlating the experimental data with the theoretical calculations, the green photoluminescence emission can be attributed to the embedded CsPbBr3 nanocrystals, and the interlayer between Cs4PbBr6 and CsPbBr3 nanocrystals plays an important role in determining their photoluminescence excitation properties. It was proposed that the existence of the CsBr interlayer between the Cs4PbBr6 matrix and embedded CsPbBr3 nanocrystals block the electron transfer of excited Cs4PbBr6 and induce photoluminesence quenching under excitation of 250–300 nm.
研究领域:
材料科学
·
光学
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DOI
高影响因子
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