MATERIALS RESEARCH BULLETIN
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2020
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IF 4.019
Ji Lei,Lo-Yueh Chang,Zhaohui Dong,Lijia Liu
Caesium lead bromide perovskite nanocrystals (PNCs) are synthesized using a room-temperature sonochemical method. By mixing equimolar of CsBr and PbBr 2 in Dimethylformamide (DMF), PNCs of CsPbBr 3 structure are formed. Under an identical reaction condition, when EuBr 2 is introduced with the CsBr/PbBr 2 precursor, the resulted product (Eu-PNCs) becomes zero-dimensional Cs 4 PbBr 6 nanocrystals. In addition to the typical green emission observed in both CsPbBr 3 and Cs 4 PbBr 6 , Eu-PNCs has a blue emission band. The overall photoluminescence quantum yield is much higher than the pristine PNCs. We perform detailed analysis of the crystal structure and luminescence properties of the nanocrystals with and without EuBr 2 modification. An X-ray absorption fine structure analysis reveals the local structure of Eu in the PNCs. We propose that the cation-solvent interaction strongly influences the crystallization process of ternary Cs x Pb y Br z , and the formation of Eu-solvent complexes further modifies the PNCs surface resulting in unique luminescence properties.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 7
·1701-1708
·
IF 5.976
Xiaoming Fu,Chi Zhang,Zhiwei Peng,Yong Xia,Jianbing Zhang,Wei Luo,Rui Zhan,Honglang Li,YuHuang Wang,Daoli Zhang
Mesocrystals, which are ordered superstructures composed of crystalline nanoparticles aligned along well-defined crystallographic directions, have recently been investigated for their novel or improved properties for different applications. All-inorganic halide perovskite CsPbX3 materials are believed to be promising materials for next generation optoelectronic devices. In this study, a facile and rapid synthesis of all-inorganic halide perovskite CsPbBr3 mesocrystals at ambient temperature in air is presented, which does not employ dimethylformamide (DMF). The results indicate that ligands have great influences on the growth kinetics and morphologies of CsPbBr3 mesocrystals with standard cubic structure and high luminescense. The destabilization of ligand matrix is responsible for the self-assembly of mesocrystals through oriented attachment into larger monocrystals because of mutual crystallographic orientations of individual building blocks with a defined long-range order on the atomic scale. Furthermore, photoactivation phenomenon was observed in CsPbBr3 mesocrystals and these intrinsic properties may help to understand the nucleation and growth mechanisms of metal-halide perovskites.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2020
·Vol. 9
·期 3
·2001435
·
IF 8.286
Bo Zhou,Dong Ding,Ye Wang,Shaofan Fang,Zexiang Liu,Jian Tang,Henan Li,Haizhe Zhong,Bingbing Tian,Yumeng Shi
All-inorganic cesium lead bromide perovskites have attracted a lot of attention because of their excellent optical properties that can potentially be applied in various optical devices. However, large-scale preparation of cesium lead bromide perovskites with outstanding optical performance is still hindered by the poor solubility of CsBr in polar aprotic solvents. In this work, a water/dimethylsulfoxide (DMSO)/dimethylformamide (DMF) system is demonstrated for the synthesis of inorganic cesium lead bromide perovskites, where the introduction of water can effectively address the dissolution issue of Cs + ions. Large-scale synthesis of pure-phase emissive Cs 4 PbBr 6 with a product yield of up to 73% is achieved and the photoluminescence quantum yield of resulting product reaches as high as 76%. The origin of the light emission is further revealed by the photoluminescence evolution of the colored Cs 4 PbBr 6 single crystals. Furthermore, reversible phase transitions between Cs 4 PbBr 6 , CsPbBr 3 and CsPb 2 Br 5 are achieved by changing solely the water content, which paves the way for the recycle of the mother solution of Cs 4 PbBr 6 without generation of additional hazardous waste. The three-solvent-based synthetic approaches enable an economical, robust, and large-scale production for all-inorganic cesium lead bromide perovskites.
研究领域:
材料科学
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Bo Wang,Congyang Zhang,Shouqiang Huang,Zhichun Li,Long Kong,Ling Jin,Junhui Wang,Kaifeng Wu,Liang Li
Lead halide perovskite nanocrystals (NCs) as promising optoelectronic materials are intensively researched. However, instability is one of the biggest challenges needed to overcome before fulfill their practical applications. To improve their stability, we present a postsynthetic controlled phase transformation of CsPbBr3 toward CsPbBr3/Rb4PbBr6 core/shell structure triggered by rubidium oleate treatment. The resulting core/shell NCs show exceptional photostability both in solution and on-chip. The solution of CsPbBr3/Rb4PbBr6 NCs can remain over 90% of the initial emission photoluminescence quantum yields after 42 h of intense light-emitting diodes illumination (450 nm, 175 mW/cm2), which is even better than the conventional CdSe/CdS quantum dots whose emission drop to 50% after 18 h under the same condition. We believe that the exceptional photostability should be resulted from the protection of the robust Rb4PbBr6 shell on CsPbBr3 NCs.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 30
·期 2
·1084-1088
·
IF 2.324
Fan Ting,Lü Jiantao,Chen Yihong,Yuan Wenxiong,Huang Yongfa
Cesium lead bromine (CsPbBr 3 ) perovskite colloidal quantum dots were prepared by hot injection method. The obtained samples were single crystal nanocubes with the average side length of 9–10 nm. The drop-casting film of the quantum dots showed obvious green stimulated emission under 400 nm femtosecond laser pumping with the full width at half maximum of about 4 nm. The laser threshold was derived to be about 471 µJ/cm 2 . The laser behavior of CsPbBr 3 quantum dots films could be attributed to random lasing modes which realized in weak scattering regimes.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 20
·9771-9778
·
IF 3.3
Qin Zhang,Fang Guo,Run-Chi Zhao,Zhi-Hong Mo
Metal halide perovskite nanocrystals (PNCs) exhibiting excellent optoelectronic properties have been commonly synthesized by the ligand-assisted reprecipitation (LARP) method. However, the application of the LARP method for the large-scale production of PNCs is greatly hindered by the heavy use of the toxic antisolvent toluene and alkylamine ligand. In this study, ethanol was used as the antisolvent to synthesize CsPbBr3 PNCs at room temperature, which was enabled by simply using cyclodextrin (α-CD) as the ligand. The proposed method could produce α-CD@CsPbBr3 PNCs with a size of 35.0 ± 0.6 nm, a photoluminescence quantum efficiency of 86.0 ± 0.1%, and a yield of 33.4 ± 0.6% (5 batches). In addition, the obtained α-CD@CsPbBr3 PNCs could persist for 6 months in ethanol with a loss of luminescence of less than 10%. The effective generation, high reproducibility, and long-term stability of the PNCs were contributed from the strong interaction between α-CD and CsPbBr3 and the poor solubility of α-CD in ethanol, which resulted in a firm enclosing of CsPbBr3 crystals within α-CD molecules. Additionally, the anion exchanges of the α-CD@PNCs were rapidly achieved in ethanol by using common salts of KI and NaCl. Using a non-toxic and low-cost antisolvent and ligand, this method is more eco-friendly and economical than ever.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 11
·2563
·
IF 3.1
Qi Liu,Hang Li,Xiaoqian Wang,Jiazhen He,Xuemin Luo,Mingwei Wang,Jinfeng Liu,Yong Liu
Amidst the rapid advancements in the fields of photovoltaics and optoelectronic devices, CsPbBr3nanosheets (NSs) have emerged as a focal point of research due to their exceptional optical and electronic properties. This work explores the application potential of CsPbBr3NSs in photonic and catalytic domains. Utilizing an optimized hot-injection method and a ZnBr2-assisted in situ passivation strategy, we successfully synthesized CsPbBr3NSs with controlled dimensions and optical characteristics. Comprehensive characterization revealed that the nucleation environment and thickness significantly influenced the structure and optical performance of the materials. The results indicate that the optimized synthesis method enables control over the lateral dimensions of the nanoparticles, ranging from 9.1 ± 0.06 nm to 334.5 ± 4.40 nm, facilitating the tuning of the excitation wavelength from 460 nm (blue) to 510 nm (green). Further analyses involving photoresponse and electrochemical impedance spectroscopy demonstrated the substantial potential of these NSs in applications such as photocatalysis and energy conversion.
研究领域:
材料科学
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光化学
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
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IF 5.1
Bojie Ding,Xinhao Cai,Shenglin Ma,Ruiting Liang,Imran Khan,Jianbei Qiu,Yue Liu,Anjun Huang,Zhiguo Song,Yangke Cun,Cherkasova Tatiana,Zhengwen Yang
Cesium lead halide perovskite (CsPbX 3 ) quantum dots (QDs) are recognized as viable substitutes for conventional fluorescent powder color converters, which can improve the color gamut and reproducibility of liquid crystal displays (LCDs). Encapsulating QDs in glass can effectively solve the water oxygen stability of QDs, but the glass matrix impedes the nucleation of QDs and the precipitation of QDs requires secondary heating. In our research, we successfully accomplished the self-crystallization of CsPbBr 3 QDs facilitated by LiF within a B 2 O 3 -SiO 2 -ZnO borosilicate glass matrix. The results indicate that the self crystallization of CsPbBr 3 QDs induced by LiF in borosilicate glass matrix has a synergistic effect. The Li + ions can break the glass network structure and facilitate ionic migration and transport, while F − ions have good electronegativity due to ion aggregation, and can strongly attract Cs + and Pb 2+ ions with larger atomic radii, thereby promoting the rapid nucleation and growth of CsPbBr 3 QDs, ultimately synthesizing QDs with uniform particle size, narrow half peak width, good optical properties, and thermal stability.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Peng Zhang,Feiming Li,Shujuan Lin,Wen-Jie Chen,Dejian Chen
Lead halide perovskite nanocrystals (PNCs) have emerged as promising materials for photocatalysis due to their exceptional optoelectronic properties, yet achieving efficient charge separation and selective oxidation reactions remains a significant challenge. In this study, we report the synthesis of Fe 3+ -doped CsPbBr 3 /SiO 2 nanocomposites (Fe-PNCs/SNPs) with gradient energy levels, designed to enhance photocatalytic performance. Our results demonstrate that Fe 3+ doping introduces mid-gap states, promotes photoinduced charge separation, and generates reactive oxygen species (ROS) such as O 2 − and OH radicals under sunlight-simulating light irradiation from a 300 W Xe arc lamp. The Fe 20 -PNCs/SNPs catalyst achieved over 99 % conversion of benzyl alcohol to benzaldehyde with high selectivity and stability in the ethanol under ambient conditions. Additionally, the catalyst exhibited excellent recyclability and broad substrate tolerance. These findings highlight the innovative design of gradient energy levels in perovskite nanocomposites, offering a new strategy for enhancing photocatalytic efficiency in selective organic transformations.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Yanling Lin,Zhennan Wu,Enrou Mei,Jiapeng Yang,Ye He,Zhenbo Xu,Xiaojuan Liang,Xingen Hu,Ruowang Liu,Weidong Xiang
Perovskite quantum dots (QDs) have become the star material for liquid crystal display (LCD). However, instability affects its practical application. Herein, CsPbBrI 2 quantum dots (CsPbBrI 2 QDs) with high quantum efficiency have been successfully precipitated in situ by adding CaO to the Li-Al-Si glass substrate. The photoluminescence quantum yield (PLQY) was adjusted from 64.5 % to 87.5 %. At the same time, we adopted a new strategy of blue light irradiation-stirred water washing. When blue light irradiation and stirred water washing interact synergistically, the naked CsPbBrI 2 QDs detached from the glass surface, while smaller CsPbBrI 2 QDs continued to grow. This process successfully resulted in CsPbBrI 2 QDs with high luminescence intensity and high stability. Moreover, when exposed to 60 °C, 90 % relative humidity (RH), and 2000 nit blue light for 240 hours (h), the treated sample could retain 91.1 % of the original emission intensity. The color gamut of the prepared CsPbBrI 2 @CsPbBr 3 @glass@polystyrene (PS) light conversion film covered 122 % of the NTSC 1953 standard and 90 % of the Rec. 2020 standard. It provided great value for the commercialization of QDs in backlight display applications.
研究领域:
材料科学
·
显示技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Yujie Chen,Fanlei Qin,Jiawen Wang,Kai Yang,Yinyan Li,Gongxun Bai
Perovskite quantum dots with halogen elements (Cl, Br, I) have been extensively studied due to their unique optoelectronic properties. However, the spectral properties of luminescent materials continue to present challenges in perovskite quantum dot glasses. Here, Eu3+-doped CsPbBr3 quantum dot glasses were successfully prepared. Meanwhile, optimizing the doping concentration of Eu3+ significantly improved the formation of quantum dots and enhanced their fluorescence intensity. After a heating–cooling cycle, the CsPbBr3:0.5% Eu3+ glass still retained 95% of its initial value. By coating CsPbBr3:0.5% Eu3+ glass powder with red phosphor on a blue chip, a white LED with a CCT of 5417 K can be prepared. Therefore, Eu3+-doped CsPbBr3 quantum dot glasses demonstrate significant potential as an efficient material for optical lighting applications.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
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
✓ 已验证
产品关联
DOI
高影响因子
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