Nanomaterials
·
2019
·Vol. 9
·期 2
·172
·
IF 4.034
Xinyue Lao,Xiyu Li,Hans Ågren,Guanying Chen
Although all-inorganic CsPbX3(X = Cl, Br, I) perovskite quantum dots (PQDs) have evoked exciting new opportunities for optoelectronic applications due to their remarkable optical properties, their emission color tunability has not been investigated to any appreciable extent. In this work, double/triple CsPbX3perovskite quantum dots with precise ratios of Cl/Br or Br/I are synthesized and their luminescence (410–700 nm) is explored. A group of down-converted CsPbX3(X = Cl, Br, I) perovskite quantum dot light-emitting diode (LED) devices were constructed to demonstrate the potential use of such double/triple-halide CsPbX3perovskite quantum dots with full-spectrum luminescence. Based on density functional theory, we theoretically explored the properties of CsPbX3with double/triple anion atoms. The calculated band gaps provided strong support that the full-spectrum luminescence (410–700 nm) of double/triple CsPbX3can be realized with the change of the mixed-halide ratios, and hence that such PQDs are of potential use in optoelectronic devices.Keywords:perovskite quantum dots;light-emitting diode;density functional theory;band gap
研究领域:
材料科学
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光电
·
理论化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Meng Cai,Wei Liu,Tiankai Zhang,Pengfei Yan,Yuxuan Li,Weiqian Kong,Hangjuan Wu,Zongwei Chen,Zhenkun Gu,Lin Dong,Qun Xu,Yanlin Song,Junjie Ma,Chongxin Shan,Feng Gao
All-inorganic CsPbX 3 (X = I, Br, Cl) perovskites emerged as a crucial material for addressing the stability bottleneck due to their exceptional resistance to both light-thermal stress. However, their performance is limited by adverse optoelectronic dissipation arising from inadequate photon conversion and chaotic carrier energetics. Herein, the mechanism of the unique nonlinear plasmonic effect in van der Waals 2D MoO 3-x is elucidated, which is mediated by electronic intermediate states. It demonstrates that the 2D MoO 3-x serves as a light-capture-antenna in heterodimensional CsPbX 3 -MoO 3-x optically coupled system, contributing to the accumulation the optical field energy on the nanoscale and resulting in a remarkable 59% increase in photon convergence. Additionally, facet-oriented carrier channels can be established through heteroepitaxy along matched Mo-O octahedron. This optoelectrical-bimodal-coupling engineering combined with a bifacial light-harvesting configuration yields a bifacial equivalent efficiency of 27.33%, which stands as the supreme performance in all-inorganic perovskite photovoltaics. Graphical This remarkable work combines supercritical CO 2 chemical engineering, two-dimension plasmon photophysical science, and perovskite photovoltaic technology. It introduces novel concepts like broad - spectrum coupled photon absorption, the intermediate - localized - states model, and optoelectrical - bimodal - coupling engineering. It aims to combat optoelectronic dissipation and enhance energy harvesting via a heterodimensional van der Waals optically coupled system.
研究领域:
光伏技术
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等离激元学
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纳米光子学
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材料科学
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光电子学
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钙钛矿太阳能电池
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固体物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Optical Materials
·
2025
·
IF 7.2
Wenbin Shi,Xiao Zhang,Ping Yang
Highly crystalline CsPbX 3 (X = Cl, Br, I) nanocrystals (NCs) are in situ grown in silicalite-1 zeolite framework by a high-temperature solid-state reaction at 600 °C without ligand addition. Subsequently, a CsPb 2 X 5 shell is hetero-epitaxial grown to form a CsPbX 3 /CsPb 2 X 5 core–shell structure. The resulting nanocomposites exhibit high photoluminescence quantum yields (PLQYs) and remarkable stability in a solid powder situation. The green-emitting (Br-based) and red-emitting (I-based) composites demonstrate nearly identical high PLQYs up to 82.9 and 83.2%, respectively, due to high crystallinity and core–shell structure. By easily adjusting halide compositions, the photoluminescence peak wavelengths of the NCs can be continuously tuned in the whole visible spectrum from 413 to 697 nm. These nanocomposites exhibit remarkable resistance to both photo-degradation under UV light irradiation and hydrolytic degradation in humid environments due to a hydrothermal treatment. The superior optoelectronic performance is ascribed to heterostructure formation and the protective confinement provided by the mesoporous silicalite-1 framework, which effectively passivates surface defects. Finally, the NCs are successfully applied to white light-emitting devices, achieving a chromaticity coordinate of (0.33, 0.32) and a correlated color temperature of 4793 K. This dual-passivation strategy, combining zeolite encapsulation and surface reconstruction, renders the nanocomposites particularly suitable for implementation in next-generation display technologies.
研究领域:
材料科学
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纳米技术
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光电子学
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固态化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Junhao Li,Dacheng Zhou,Ying Liu,Yan Chen,Jiayuan Chen,Yong Yang,Yuan Gao,Jianbei Qiu
All inorganic perovskite (CsPbX3, X = Cl, Br, I) quantum dot (QD) glass samples are considered the next generation of lighting materials for their excellent luminescence properties and stability, but crystallization conditions are difficult to control, which often leads to the inhomogeneous crystallinity of QDs. Here, we provided evidence that the presence of sodium fluoride induced self-crystallization of CsPbBr3 QDs during routine glass formation without the need for additional heat treatment. We showed that NaF simultaneously affected the network structure of glass and promoted the formation of CsPbBr3 QDs, that is, Na+ ions entered the glass network skeleton, partially interrupting the network structure, while the strong electronegativity of F– ions attracted Cs+ and Pb2+ ions into the gaps formed in the glass networks that had been loosened up by Na+ ions, which reduced the activation energy of crystallization processes. Our results showed that NaF-induced CsPbBr3 QDs glass had excellent thermal stability, high photoluminescence quantum efficiency (49%), and luminescent stability under high-power laser irradiation. Finally, this work also demonstrated the general applicability of this method in the making of a series of CsPbX3 (X = Cl, Br, I) QD glass samples by NaF-induced self-crystallization, which drastically expanded the color gamut to a range of full spectrum for luminescence and laser-driven projection displays. We believe that the work presented here represents a new direction for the research and development of full-color gamut inorganic perovskite quantum dot glass samples, which could have a significant impact on the future applications of laser-driven projection displays as well.
研究领域:
材料科学
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光学工程
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
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2022
·
IF 4.171
Xiaobo Hu,Yanqiao Xu,Jiancheng Wang,Jiaxin Ma,Lianjun Wang,Wan Jiang
All-inorganic CsPbX 3 (X=Cl, Br, I) perovskite nanocrystals (NCs) exhibit attractive optoelectronic properties for lighting and displays application but suffer from the lack of profound insights into their reaction kinetics. Herein, a modified ligand-assisted reprecipitation (LARP) method was developed to synthesize high-quality CsPbBr 3 NCs by utilizing oleic acid (OA) and n-octylamine (OTAm) as surface ligands, and the effect of Cs/Pb ratio, precursors and ligands concentration on the structure, morphology and fluorescence properties was systematically investigated. The monodisperse CsPbBr 3 NCs with cubic shape and average particle size of 13.7 nm are obtained by optimizing the reaction parameters. Appropriately increasing the Cs/Pb ratio and precursors concentration to 0.5 and 1.0 mM are favorable for forming a more complete crystal structure with lower defect states density, which can significantly enhance the PL intensity. Notably, the surface defect states of CsPbBr 3 NCs are effectively passivated by the coordinated OA and OTAm ligands, and the maximum photoluminescence quantum yield (PLQY) can reach to 85.2%. Importantly, the effective synthesis of high-quality CsPbBr 3 NCs can be amplified up to 50 times of reaction volume after finely optimizing the reaction parameters. Based on a facile anion exchange process, the CsPbX 3 NCs with variable halogen composition exhibit tunable emission of 443.3∼649.1 nm and a wide color gamut of 117% NTSC standard. This work provides profound sights on the reaction kinetics of perovskite NCs, and further promotes its practical application in optoelectronic field.
研究领域:
材料科学
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光电
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纳米技术
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化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
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2022
·
IF 5.532
Zhangwen Long,Shuai Yang,Jiacheng Pi,Dacheng Zhou,Qi Wang,Yong Yang,Hao Wu,Jianbei Qiu
All-inorganic metal halides perovskites , such as CsPbX 3 quantum dots (QDs), are high-performance photoelectric materials ; they have attracted considerable attention for applications such as LEDs and laser and solar cells. Herein, we report an anion hot injection (HI) method to prepare CsPbX 3 (X = Cl, Br, I, Cl/Br, and Br/I) QDs using trimethylhalosilane (TMXS) as a halogen ion donor. By adjusting the ratio of different TMXSs (trimethylchlorosilane, trimethylbromosilane, and trimethyliodosilane), the synthesized samples can achieve tunable emission in the range of 416–710 nm, narrow emission line widths of 13–33 nm, and luminescence lifetimes of 32–223 ns. These QDs also have better stability in external environment compared with those obtained using traditional HI method.
研究领域:
材料科学
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光电子学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Mingye Ding,Xiaoyan Wang,Yinbiao Shi,Zixia Lin,Zhengtao Deng,Xiaofei Yang
Owing to their excellent photoelectric and optical properties, lead halide perovskite quantum dots (PeQDs) have attracted great attention and have broad applications in various fields. However, the shortcomings of poor stability and short-wavelength (ultraviolet/visible) excitation restrict their practical applications. Herein, to address the above issues, we report a polyacrylonitrile-based composite film containing CsPbX3 (X = Br and I) PeQDs and β-NaYF4:Yb/Ln (Ln = Tm and Er) upconversion nanoparticles (UCNPs) via an electrospinning strategy. Interestingly, all-inorganic CsPbX3 PeQDs are synthesized through an in situ growth process in polyacrylonitrile nanofibers, which provide a polymer matrix for the protection of PeQDs against decomposition under the effect of an external environment. Upon 980 nm laser irradiation, lanthanide-sensitized UC luminescence of stable CsPbX3 can be realized through radiative energy transfer from Tm3+/Er3+ ions to PeQDs. Consequently, dual-mode luminescence, including downshifting and UC with color-tunable outputs, can be observed from PeQDs under dual-wavelength excitation (UV and NIR). Benefiting from the special luminescent feathers (temperature-sensitive UC and dual-mode luminescence), the as-obtained composite nanofibers exhibit great potential in high-level anticounterfeiting and accurate noncontact thermometry.
研究领域:
材料科学
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纳米技术
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光学
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光子学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2023
·Vol. 19
·期 50
·2304377
·
IF 13.3
Yueling Lai,Yufeng Zhou,Hongjiang Liu,Tongyin Guo,Anqi Zou,Lianju Wang,Yiqing Chen,Xianglong Zhao,Kanghui Zheng,Xin Tong,Ruilin Wang
Solid-state anion exchange method is easy to handle and beneficial to improve stability of CsPbX 3 (X = Cl, Br, I) perovskites nanocrystals (NCs) with respect to anion exchange in liquid phase. However, the corresponding exchange rate is rather slow due to the limited diffusion rate of anions from solid phases, resulting in mixed-halide perovskite NCs. Herein, a fast and reversible post-synthetic quasi-solid-state anion exchange method in CsPbX 3 NCs with inorganic potassium halide KX salts/polyvinylpyrrolidone (PVP) thin film is firstly reported. Original morphology of the exchanged NCs is well-preserved for all samples. Complete anion exchange from Br − to Cl − or I − is successfully achieved in CsPbX 3 NCs within ≈20 min through possible vacancies-assisted ion exchange mechanism, under ambient conditions and vice versa. Particularly, Br − -exchanged CsPbCl 3 and CsPbI 3 NCs exhibit improved optical properties. Encouraged by the attractive fluorescence and persistent luminescence as well as good stability of the resulted CsPbX 3 NCs, an effective dual-mode information storage–reading application is demonstrated. It is believed that this method can open a new avenue for the synthesis of other direct-synthesis challenging quantum-confined perovskite NCs/nanoplates/nanodisks or CsSnX 3 NCs/thin film and provide an opportunity for advanced information storage compatible for practical applications.
研究领域:
材料科学
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纳米技术
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光电技术
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信息技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2023
·
IF 13.3
Yongfeng Liu,Xiuwen Shao,Zhaoju Gao,Qingyu Xie,Yupeng Ying,Xiaolin Zhu,Zhangcheng Pan,Jinpeng Yang,Hao Lin,Xiaosheng Tang,Weiwei Chen,Wei Pei,Yusong Tu
Inorganic CsPbX 3 perovskite quantum dots (PeQDs) show great potential in white light-emitting diodes (WLEDs) due to excellent optoelectronic properties, but their practical application is hampered by low photoluminescence quantum yield (PLQY) and especially poor stability. Herein, we developed an in-situ and general multidentate ligand passivation strategy that allows for CsPbX 3 PeQDs not only near-unit PLQY, but significantly improved stability against storage, heat, and polar solvent. The enhanced optical property arises from high effectiveness of the multidentate ligand, diethylenetriaminepentaacetic acid (DTPA) with five carboxyl groups, in passivating uncoordinated Pb 2+ defects and suppressing nonradiative recombination. First-principles calculations reveal that the excellent stability is attributed to tridentate binding mode of DTPA that remarkably boosts the adsorption capacity to PeQD core. Finally, combining the green and red PeQDs with blue chip, we demonstrated highly luminous WLEDs with distinctly enhanced operation stability, a wide color gamut of 121.3% of national television system committee, standard white light of (0.33,0.33) in CIE 1931, and tunable color temperatures from warm to cold white light readily by emitters’ ratio. This study provides an operando yet general approach to achieve efficient and stable PeQDs for WLEDs and accelerates their progress to commercialization.
研究领域:
材料科学
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光电技术
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2022
·
IF 9.231
Jinxing He,Lu Yu,Yandu Jiang,Lei Lü,Zhonghui Han,Xiaolei Zhao,Zhixiang Xu
All-inorganic cesium lead halides (CsPbX 3 , X = Cl, Br, I) perovskite quantum dots (PQDs) have attracted extensive research attention due to their unique optical properties. However, their instability and sensitivity to air and moisture hinder further use in fluorescent sensing applications. In this work, the construction and application of PQDs encoded molecularly imprinted polymers (MIPs-CsPbX 3 ) for Sudan I detection were proposed. After being encoded the PQDs, the obtained MIPs-CsPbX 3 microspheres exhibited high stability for the external environment, remarkable bright fluorescence, and specific recognition for Sudan I. The fluorescent intensity of the MIPs-CsPbX 3 microspheres was obviously quenched upon loading Sudan I, and good linear responses in the range of 0.5–150 µg L −1 , limit of detection of 0.3 µg L −1 , and good recoveries of 95.27 % to 105.96 % in spiked samples were obtained. The developed fluorescent probe provided a selective and sensitive quantified method for Sudan I detection in food matrices.
研究领域:
材料科学
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分析化学
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食品安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 12
·3242
·
IF 5.076
Yu Sun,Jin Chen,Fengchao Wang,Yi Yin,Yan Jin,Jun Wang,Xiaogai Peng,Ruiyi Han,Canyun Zhang,Jinfang Kong,Jing Yang
Nowadays, Mn-doping is considered as a promising dissolution for the heavy usage of toxic lead in CsPbX3perovskite material. Interestingly, Mn-doping also introduces an additional photoluminescence band, which is favorable to enrich the emission gamut of this cesium lead halide. Here, a solution spraying strategy was employed for the direct preparation of CsPbxMn1−x(Br,Cl)3film through MnCl2doping in host CsPbBr3material. The possible fabrication mechanism of the provided approach and the dependences of material properties on Mn-doping were investigated in detail. As the results shown, Pb was partially substituted by Mn as expected. With the ratio of PbBr2:MnCl2increasing from 3:0 to 1:1, the obtained film separately featured green, cyan, orange-red and pink-red emission, which was caused by the energy transferring process. Moreover, the combining energy of Cs, Pb, and Mn gradually red-shifted resulted from the formation of Cs-Cl, Pb-Cl and Mn-Br coordination bonding as MnCl2doping increased. In addition, the weight of short decay lifetime of prepared samples increased with the doping rising, which indicated a better exciton emission and less defect-related transition. The aiming of current work is to provide a new possibility for the facile preparation of Mn-doping CsPbX3film material.Keywords:MnCl2doping;CsPbxMn1−x(Br,Cl)3;thin films;solution spraying
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Micromachines
·
2024
·Vol. 15
·期 9
·1150
·
IF 3
Xinqiang Ma,Shengying Fan,Wenwen Yang,Jiajie Wei,Xiaolei Wang,Jincheng Ni,Wei Cheng,Qinhe Zhang
Perovskite as an emerging semiconductor luminescent material has attracted widespread attention due to its simple preparation, high luminescence quantum yield, high color purity, tunable spectrum, and ability to cover the entire visible light band. However, due to the influence of water or other highly polar solvents, oxygen, temperature, and radiation, perovskite nanocrystals will aggregate or collapse in the lattice, eventually leading to luminescence quenching. This study starts from the postprocessing of perovskite, uses methyl methacrylate as the monomer and TPO as the photoinitiator, and encapsulates the perovskite powder prepared by the hot injection method through ultraviolet light initiation. A method is proposed to improve the luminescence and crystal structure stability of perovskite. By eliminating the influence of environmental factors on perovskite nanocrystals through the dense structure formed by organic polymers, the resistance of perovskite to strong polar solvents such as water will be greatly improved, and it has great potential in the protection of perovskite. Finally, by changing the proportion of halogen elements in the perovskite resin to change the color of the luminescent resin, a fluorescent coating emitting light in all visible light bands is prepared. Fluorescent coatings are widely used in life and industry fields such as plastics, sol, and paper.
研究领域:
材料科学
·
光学工程
✓ 已验证
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）