Journal of Physical Chemistry C
·
2022
·
IF 4.177
Jinlei Zhang,Cihui Liu,Shuyi Wu,Yunsong Di,Fangjian Xing,Zhiyuan Ren,Xiao Zhang,Lun Yang,Chunlan Ma,Zhixing Gan
Deep insight into the ultrafast charge carrier dynamics is fundamentally significant for the development of high-performance optoelectronic devices. The CsPbBr3/Cs4PbBr6 nanocomposite, as an important member of the perovskite family, has attracted extensive research interest. However, the underlying ultrafast carrier dynamics is still elusive. Herein, an endeavor has been made to investigate the impact of Cs4PbBr6 encapsulation on the ultrafast carrier dynamics of CsPbBr3 nanoinclusions. The hot-carrier cooling time is about 190–302 fs, relying on the pump fluence, which is relatively shorter than that of pure CsPbBr3. Thus, the encapsulation of Cs4PbBr6 shortens the hot-carrier cooling time, which is attributed to the participation of longitudinal optical (LO) phonons from Cs4PbBr6 and dissipation of the energy via coupling to surface encapsulation. The biexciton binding energy is estimated to be 69 meV, with a biexciton lifetime of 40 ps. The biexciton binding energy is a relatively high value compared to those of CsPbBr3 nanostructures with similar biexciton lifetimes, which is mainly due to the smaller sizes of the CsPbBr3 inclusions in the composites.
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高影响因子
Crystals
·
2021
·Vol. 11
·期 11
·1287
·
IF 2.589
Yue Han,Rong Wen,Feng Zhang,Linlin Shi,Wenyan Wang,Ting Ji,Guohui Li,Yuying Hao,Lin Feng,Yanxia Cui
High-quality, all-inorganic CsPbBr3/Cs4PbBr6composite perovskite nanocrystals (NCs) were obtained with all-solution-processing at room temperature, and a photodetector (PD) with high detectivity was realized based on CsPbBr3/Cs4PbBr6NCs. The detectivity (D*) of the proposed PD is 4.24 × 1012Jones under 532 nm illumination, which is among the highest levels for PDs based on all-inorganic perovskite NCs. In addition, a high linear dynamic range (LDR) of 115 dB under 1 V bias was also realized. Furthermore, the underlying mechanism for the enhanced performance of the proposed PD was discussed. Our work might promote the preparation of high-performance PDs based on dual-phase all-inorganic perovskite nanocrystals.Keywords:all-inorganic lead halide perovskite;CsPbBr3;Cs4PbBr6;perovskite nanocrystals;photodetector
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高影响因子
DALTON TRANSACTIONS
·
2018
·Vol. 47
·期 16
·5670-5678
·
IF 4.099
Xiao Chen,Daqin Chen,Junni Li,Gaoliang Fang,Hongchao Sheng,Jiasong Zhong
As a novel type of promising materials, metal halide perovskites are a rising star in the field of optoelectronics. On this basis, a new frontier of zero-dimensional perovskite-related Cs4PbBr6 with bright green emission and high stability has attracted an enormous amount of attention, even though its photoluminescence still requires to clarification. Herein, the controllable phase transformation between three-dimensional CsPbBr3 and zero-dimensional Cs4PbBr6 is easily achieved in a facile ligand-assisted supersaturated recrystallization synthesis procedure via tuning the amount of surfactants, and their unique optical properties are investigated and compared in detail. Both Cs4PbBr6 and CsPbBr3 produce remarkably intense green luminescence with quantum yields up to 45% and 80%, respectively; however, significantly different emitting behaviors are observed. The fluorescence lifetime of Cs4PbBr6 is much longer than that of CsPbBr3, and photo-blinking is easily detected in the Cs4PbBr6 product, proving that the zero-dimensional Cs4PbBr6 is indeed a highly luminescent perovskite-related material. Additionally, for the first time, tunable emissions over the visible-light spectral region are demonstrated to be achievable via halogen composition modulations in the Cs4PbX6 (X = Cl, Br, I) samples. Our study brings a simple method for the phase control of CsPbBr3/Cs4PbBr6 and demonstrates the intrinsic luminescence nature of the zero-dimensional perovskite-related Cs4PbX6 products.
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高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Chenfei Wang,Canyun Zhang,Fengchao Wang,Jin Chen,Enliang Ren,Jinfang Kong,Lan Li,Jiayue Xu,Yan Zhang
All-inorganic lead halide perovskite nanocrystals (NCs) have attracted enormous attention owing to their excellent optical properties such as ultrahigh photoluminescence quantum yield (PLQY), narrow full width at half maximum (FWHM) and broad emission spectra tunability. In this study, we reported the synthesis of colloidal perovskite NCs based on CsPbBr 3 @Cs 4 PbBr 6 composite structure. With the assistance of Tetraoctylammonium bromide (TOAB) ligands, the prepared CsPbBr 3 @Cs 4 PbBr 6 NCs show high PLQY of 94.7% and enhanced stability. The crystal morphology and phase structure of the CsPbBr 3 @Cs 4 PbBr 6 NCs were investigated by HRTEM and XRD measurements. In addition, the crystal morphology of CsPbBr 3 @Cs 4 PbBr 6 NCs presents cubic and circular particles with an average size of 9.3 nm. Compared with CsPbBr 3 NCs, the diphase CsPbBr 3 @Cs 4 PbBr 6 composite materials can perform higher optical properties due to the in-situ passivation of the generated Cs 4 PbBr 6 NCs. Furthermore, the fabricated LED device exhibits bright white light emission with a color coordinate of (0.335, 0.337), the corresponding color temperature of 5390 K and a color rendering index of 82.1 under the injection current of 30 mA. These results demonstrate that the obtained CsPbBr 3 @Cs 4 PbBr 6 NCs have a potential application in white light-emitting and display devices.
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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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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
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yan Chen,Ying Liu,Junhao Li,Chunli Zhao,Yougui Yang,Ling He,Meng Wu,Qi Wang,Yong Yang,Chunjian Wang,Dacheng Zhou,Jianbei Qiu
Hydrochromic materials have received much attention in anticounterfeiting due to their reversible photoemission properties toward water. However, existing hydrochromic materials usually suffer from slow hydrochromic response and limited stability, repeatability, and color tunability. This paper found for the first time that CsPbBr 3 /Cs 4 PbBr 6 composites with quantum-limited domain effects had reversible hydrochromism. CsPbBr 3 /Cs 4 PbBr 6 composites were successfully synthesized in molecular sieve MCM-41 using an improved mechanochemical method. The composites underwent a reversible phase transition from Cs 4 PbBr 6 /CsPbBr 3 to CsPbBr 3 upon treatment with a trace amount of water, the photoluminescence colors underwent a change from blue to green, and reversion occurred due to heating. Mechanistic investigation revealed that quantum dots underwent soft agglomeration due to van der Waals forces in polar solvent environments, affecting the action of quantum domain-limiting effects. Therefore, organic solvents with different polarities can cause different degrees of reversible discoloration of the material. This study provides new ideas for understanding the phase transition and agglomeration of metal halide perovskite quantum dots in polar solvent environments. Additionally, it offered new options for aqueous color-changing materials and organic solvent polar detection materials.
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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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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.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Longshi Rao,Qing Zhang,Bin Sun,Mingfu Wen,Jiayang Zhang,Shudong Yu,Ting Fu,Xiaodong Niu
Cesium lead halide perovskite crystals have attracted widespread attention due to their excellent photoelectric properties. However, their intrinsic instability and the photoluminescence quantum yield (PLQY) sharply dropped in the solid-state limit their practical applications. Besides, the current synthesis strategies either need a variety of ligands, or an anti-solvent, which will result in potential environmental risks. Herein, we address the above issues simultaneously by embedding CsPbBr 3 in a large bandgap Cs 4 PbBr 6 matrix by high-speed mechanical mixing without using any ligands and highly toxic anti-solvent. Changing the molar ratio of PbBr 2 /CsBr, centrifugation time, and the solution concentration, the optimized CsPbBr 3 /Cs 4 PbBr 6 show a high PLQY of up to 79%. In addition, mechanistic studies show that the origin of green luminesce of CsPbBr 3 /Cs 4 PbBr 6 microcrystals is closely related to the CsPbBr 3 inclusion theory, but not to the Br vacancy theory, in which CsPbBr 3 embedded in Cs 4 PbBr 6 to form a CsPbBr 3 /Cs 4 PbBr 6 heterostructure . By taking advantage of the heterostructure, the photostability and thermostability of CsPbBr 3 /Cs 4 PbBr 6 are significantly enhanced. In addition, the high optical and temperature/humidity-stable performances of CsPbBr 3 /Cs 4 PbBr 6 are verified by applying them to white LEDs (WLEDs). The electroluminescence intensity of WLEDs remains 70% of the original one after being stored in a chamber with high temperature and high humidity (85 °C/RH 85%) for 40 h, and the device displays luminous efficiency of 74.5 lm/W at 20 mA. This result provides a solid foundation for their scale applications in lighting, displays, and other optoelectronic and photonic devices.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Zong-Tao Li,Bo-Jia Li,Jia-Sheng Li,Cun-Jiang Song,Xin-Rui Ding,Hai-Long Yuan,Bin-Hai Yu,Yong Tang,Jian-Zhen Ou,Romain Gautier,Hong-Lei Ji,Hao-Chung Kuo
Although stable perovskite phosphors, i.e., CsPbBr 3 /Cs 4 PbBr 6 , were extensively reported and made great progress, achieving strong photoluminescence (PL) energy outcoupling remains challenging owing to their short Stoke’s shift with serious PL energy absorption. This study utilized internal resonant scattering (IRS) to improve the PL energy outcoupling (PEO) of CsPbBr 3 /Cs 4 PbBr 6 perovskite phosphor, which was realized by the nanopore-packing perovskite particles (NP-PPs) structure inside a phosphor. The nano-porous matrix hybrid solid–liquid interfacial reaction was developed to construct NP-PPs in a phosphor, and it is optimized to achieve a denser NP-PP structure with an enhanced PEO effect (2.8-fold enhanced PL intensity). Numerical results revealed that the NP-PP structure transforms the PL energy absorption mode to the IRS mode, most of the scattering PL energy evades NP-PPs instead of propagating inside. The optimized phosphor was applied to white devices, and we finally achieved an ultrahigh luminous efficacy of 131.32 lm/W based on green perovskite phosphors. This study provides a general guide for efficient perovskite phosphors utilizing the nano-porous matrix to enable the IRS effect.
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高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Cong He,Chunwen Ye,Meng Wu,Shiwei Yang,Herui Zhao,Yiping Wu,Yanjie Zhang
Zero-dimensional quantum dots (QDs) with formulas of Cs4PbX6 and CsPbX3 (X = I, Br, Cl) have emerged in recent years for next-generation functional materials in optoelectronics fields. However, CsPbX3 and Cs4PbX6 QDs are unstable when separated from colloidal solution, still less enduring thermal and water attack. Herein, lithium disilicate glass ceramics, a fantastic dental restorative material with excellent mechanical properties and good semitransparency, have been used as the rigid armor to keep CsPbBr3/Cs4PbBr6 QDs away from destructive environmental influences. Notably, lithium disilicate glass ceramics can effectively prevent the aggregation and further growth of QDs even at a high calcination temperature (600 °C), while the average particle sizes of the QDs in lithium disilicate glass ceramic are only ∼3.3 nm. The CsPbBr3/Cs4PbBr6 quantum dot glass microcrystalline prepared at 600 °C exhibits intense green emission at ∼520 nm with a greatly enhanced emission intensity of ∼5.1 times that of the sample prepared at 500 °C. Interestingly, the abnormal luminescence enhancement (∼195%) appeared after the as-prepared CsPbBr3/Cs4PbBr6 quantum dot glass microcrystalline was immersed in water for 72 h. The ultrastable CsPbBr3/Cs4PbBr6 QDs glass microcrystalline exhibits great potential in lighting and displays fields similar to traditional inorganic phosphors.
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