Nature Communications
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2023
·Vol. 14
·期 1
·1-10
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IF 16.6
Jin Hui,Xu Zhewei,Hu Zhi-Yi,Yin Zhiwen,Wang Zhao,Deng Zhao,Wei Ping,Feng Shihao,Dong Shunhong,Liu Jinfeng,Luo Sicheng,Qiu Zhaodong,Zhou Liang,Mai Liqiang,Su Bao-Lian,Zhao Dongyuan,Liu Yong
The design of Pt-based nanoarchitectures with controllable compositions and morphologies is necessary to enhance their electrocatalytic activity. Herein, we report a rational design and synthesis of anisotropic mesoporous Pt@Pt-skin Pt 3 Ni core-shell framework nanowires for high-efficient electrocatalysis. The catalyst has a uniform core-shell structure with an ultrathin atomic-jagged Pt nanowire core and a mesoporous Pt-skin Pt 3 Ni framework shell, possessing high electrocatalytic activity, stability and Pt utilisation efficiency. For the oxygen reduction reaction, the anisotropic mesoporous Pt@Pt-skin Pt 3 Ni core-shell framework nanowires demonstrated exceptional mass and specific activities of 6.69 A/mg pt and 8.42 mA/cm 2 (at 0.9 V versus reversible hydrogen electrode), and the catalyst exhibited high stability with negligible activity decay after 50,000 cycles. The mesoporous Pt@Pt-skin Pt 3 Ni core-shell framework nanowire configuration combines the advantages of three-dimensional open mesopore molecular accessibility and compressive Pt-skin surface strains, which results in more catalytically active sites and weakened chemisorption of oxygenated species, thus boosting its catalytic activity and stability towards electrocatalysis.
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MATERIALS CHEMISTRY AND PHYSICS
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2023
·
IF 4.6
Yuting Wang,Xiong Shen,Chenggang Yuan,Bingkun Chen,Lin Chen,Zhongming Wang,Fei Hu,Qiuyun Ouyang
Halide perovskite (Cs 3 Cu 2 Br 5 ) is synthesized by a thermal injection method. The X-ray diffraction (XRD) proves that the Cs 3 Cu 2 Br 5 crystal phase is an intersection phase. The Cs 3 Cu 2 Br 5 organic glasses are fabricated by dispersing Cs 3 Cu 2 Br 5 materials in methyl methacrylate (MMA). The nonlinear absorption (NLA) and the nonlinear refraction (NLR) performances of Cs 3 Cu 2 Br 5 /PMMA organic glasses are measured via the open-aperture (OA) and the closed-aperture (CA) Z-scan technique, respectively. The samples show typical reverse saturable absorption (RSA) and self-focusing effect with the change of input energy (40–72 μJ). Meanwhile, the room-temperature photo-luminescence (PL) measurement reveals light emission for Cs 3 Cu 2 Br 5 . The effects on nonlinear optical (NLO) properties are investigated by controlling the input energy and the amount of the sample. The Cs 3 Cu 2 Br 5 /PMMA organic glasses exhibit excellent NLA and NLR properties. The NLA coefficient of (Cs 3 Cu 2 Br 5 ) 18 /PMMA organic glass is much higher than those of lead-containing perovskite such as CsPbCl 3 and CsPbBr 3 nanosheets . This results in Cs 3 Cu 2 Br 5 /PMMA organic glasses show superior optical limiting (OL) performance. The Cs 3 Cu 2 Br 5 perovskite materials show great potential in devices such as light-emitting diodes and optical switches.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Qiangqiang Wang,Xuanyu Zhang,Lei Qian,Chaoyu Xiang
Perovskite quantum dot light-emitting diodes (QLEDs) are potential candidates for next-generation displays due to their high color purity and wide color gamut. Due to the strong electron-accepting ability of poly[bis(4-phenyl) (2,4,6-trimethylphenyl) amine] (PTAA), quantum dot (QD) films are prone to be charged, which leads to the imbalance of charge injection and the increase of nonradiative recombination, ultimately affecting the performance of the QLEDs. Here, we compared and studied two polymers, poly(methyl methacrylate) (PMMA) and poly(vinyl pyrrolidone) (PVP), as the hole interface buffer layers of QD films, which effectively reduced the defect density, suppressed nonradiative recombination, and greatly improved the efficiency and stability of QLEDs. The devices with PMMA achieved a maximum external quantum efficiency of 20.71%.
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Light-Science & Applications
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2023
·Vol. 12
·期 1
·1-10
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IF 19.4
Gu Kai,Zhong Haizheng
Light-to-heat conversion has been intensively investigated due to the potential applications including photothermal therapy and solar energy harvesting. As a fundamental property of materials, accurate measurement of light-to-heat conversion efficiency (LHCE) is of vital importance in developing advanced materials for photothermal applications. Herein, we report a photothermal and electrothermal equivalence (PEE) method to measure the LHCE of solid materials by simulating the laser heating process with electric heating process. The temperature evolution of samples during electric heating process was firstly measured, enabling us to derive the heat dissipation coefficient by performing a linear fitting at thermal equilibrium. The LHCE of samples can be calculated under laser heating with the consideration of heat dissipation coefficient. We further discussed the effectiveness of assumptions by combining the theoretical analysis and experimental measurements, supporting the obtained small error within 5% and excellent reproducibility. This method is versatile to measure the LHCE of inorganic nanocrystals, carbon-based materials and organic materials, indicating the applicability of a variety of materials.
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Advanced Optical Materials
·
2023
·Vol. 11
·期 16
·2300306
·
IF 9
Wei Shen,Zhan Su,Shuo Chen,Yujun Dai,Yue Qiu,Yanfeng Chen,Jiayu Jiang,Jianbin Zhang,Yun Wang,Hao Cui,Yanxing He,Kun Cao,Bo Cai,Lihui Liu,Shufen Chen
Development of high-performance and stable pure red perovskite light-emitting devices (LEDs) promotes commercialization of perovskite. Benefiting from the quantum confinement effect, pure red CsPbI 3 quantum dots (QDs) can avoid the color drift issue for mixed halide systems. Herein, a facile temperature-dependent hot-injection method combined with low temperature gradient centrifugation is employed to prepare 5.60 ± 0.05 nm pure red QDs. The QDs exhibit 642 nm photoluminescence (PL) with 37 nm full width at half maximum, and their Commission Internationale de l'Eclairage (CIE) coordinates located at (0.708, 0.292) match well with standard pure red for Rec. 2020. The PL half-lifetime for pure red QDs solution is 210 days under ambient conditions, and both the X and Y coordinates of CIE only fluctuate within (0.002, 0.002). Finally, a simple NH 4 I post-treatment to decrease ligand length further boosts the QDs conductivity, and the pure red LED exhibits 9.4% maximum external quantum efficiency. The electroluminescence spectra exhibits a sharp peak at 645 nm, and their CIE coordinates are located at (0.707, 0.290). Furthermore, the pure red LED exhibits both good working and color stability. Its half-lifetime is 25.1 min and color drifts are only (0.002, 0.002) after 30.0 min of continuous working at 60 cd m −2 with a constant current density of 3.5 mA cm −2 .
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COLLOIDS AND SURFACES B-BIOINTERFACES
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2023
·
IF 5.8
Hui Zhang,Ruihan Liu,Peng Wan,Xuelin You,Shanshan Li,Zongjun Liu,You Wang,Fang Han,Juanyuan Hao,Yu Li
Tumor cells obtain energy supply from the unique metabolic pathways of mitochondrial respiration and glycolysis, which can be used interchangeably to produce adenosine triphosphate (ATP) for survival. To simultaneously block the two metabolic pathways and sharply cut off ATP supply, a multifunctional “nanoenabled energy interrupter” (called as HNHA-GC) was prepared by attaching glucose oxidase (GOx), hyaluronic acid (HA), and 10-hydroxycamptothecin (CPT) on the surface of degradable hydroxyapatite (NHA) nanorods . After targeted delivery of HNHA-GC to the tumor site by HA, the tumor-selective acid degradation of HNHA-GC as well as the subsequent deliveries of Ca 2+ , drug CPT, and GOx take place. The released Ca 2+ and CPT induce mitochondrial dysfunction by Ca 2+ overload and chemotherapy respectively, while the GOx-triggered glucose oxidation inhibits glycolysis by starvation therapy (exogenous effect). The generated H 2 O 2 and released CPT increase the intracellular reactive oxygen (ROS) level. Moreover, the generated H + and enhanced ROS promote Ca 2+ overload by accelerating the degradation of HNHA-GC and preventing intracellular Ca 2+ efflux, respectively (endogenous effect). As a result, the HNHA-GC displays a promising therapeutic modality for simultaneously cutting off mitochondrial and glycolytic ATP production through a combination of Ca 2+ overload, chemotherapy, and starvation therapy.
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Advanced Optical Materials
·
2023
·Vol. 11
·期 14
·2300248
·
IF 9
Huayu Wei,Chenlin Wang,Xiaoxiao Li,Heyan Meng,Bingyi Tong,Luxi Li,Xuepeng Zhan,Bing Jin,Baoqing Sun,Yanmin Zong,Xian Zhao,Yuan Gao
Cadmium chalcogenide colloidal quantum wells (CQWs) are a unique class of optical gain materials that can be precisely engineered in terms of thickness and composition at the atomic level using colloidal atomic layer deposition (c-ALD). However, the atomic layer deposition is typically performed at room temperature, resulting in low emission efficiency and the need for additional thermal annealing. In this study, ultraviolet (UV) illumination is used to treat the CQWs prepared using c-ALD and a significant improvement in their photoluminescence is observed, with an irreversible 79-fold increase. Furthermore, the lasing threshold is reduced to two-thirds of the untreated samples, enabling whispering gallery mode lasing from the CQW in solution. This research demonstrates an efficient and convenient method for boosting the emission from the CQWs and highlights the advantages of CQWs as optical gain media that can be engineered with atomic precision.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2023
·
IF 4.4
Xianju Zhou,Qianyang Chang,Guotao Xiang,Sha Jiang,Li Li,Xiao Tang,Faling Ling,Yongjie Wang,Jingfang Li,Zhen Wang,Xuecong Zhang
Light-emitting perovskite quantum dots (PeQDs) are extensively investigated owing to their evident merits. However, it is still a challenge to adjust their intrinsic emissions and enhance their thermal stability to achieve full-color highly emissive QD-based light-emitting diodes (QLEDs), especially blue QLEDs. Herein, we demonstrate an effective strategy to fundamentally stabilize the crystal structure of CsPbBr 3 QDs by codoping Na + and Cu 2+ ions, which are designed to substitute Cs + (A sites) and Pb 2+ (B sites), respectively. It is found out that the codoping metal ions have significantly improved the thermal stability and the optical properties of the QDs. 40% of the emission intensity can be remained after 8 thermal cycles (20–120 °C) for CsPbBr 3 : Na + /Cu 2+ QDs, whilst less than 10% is maintained for undoped CsPbBr 3 QDs. Accordingly, stable blue QLEDs are packed by CsPbBr 3 : Na + /Cu 2+ QDs. Strong electroluminescence with the maximum luminance of 7161 cd m −2 and low turn-on voltage of 2.4 V are realized. The CIE coordinates are tuned from green (0.10, 0.74) to blue (0.17, 0.25) via Na + and Cu 2+ codoping. The maximum external quantum efficiency (EQE max ) is obtained as 4.52% for PeLEDs based on codoped QDs. The proposed metal ions A and B sites dual substitution strategy guarantees PeQDs as an extremely promising prospect in potential applications as high-resolution displays and high-quality lightings.
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Small
·
2023
·Vol. 19
·期 33
·2301010
·
IF 13.3
Jie Chen,Yiwen Zeng,Ruifen Sun,Weiwei Zhang,Yun Huang,Jingcheng Zheng,Yuwu Chi
The intrinsic instability of halide perovskites toward to external stimulus, has created a competitive advantage for designing stimuli-responsive materials. However, the external environment tuning reversibly fluorescence emission of perovskite system is still limited. In this work, humidity is verified to act as a new option to modulate the emission properties of mixed-halide perovskite. The perovskite nanocrystals (PNCs) photoirradiated in dichloromethane are easily and stably redispersed in water, and emit bright fluorescence which is quite different from the original. Moreover, the perovskites confined on glass slide can reversibly switch their fluorescence between blue and green colors under moisture. It is demonstrated that the factors of different solubilities of CsCl and CsBr in water, the structural transformation of perovskites and the confine of glass matrix play key roles in the reversible transformation. Finally, the combination of hydrochromic CsPb(Br x Cl y ) 3 and water-resistant CsPb(Br x Cl y ) 3 -polymethyl methacrylate have been applied in advanced anti-counterfeiting, which greatly improves the information security. This work not only give an insight into the effects of humidity on fluorescence and structures of PNCs, but also offer a new class of hydrochromic PNCs materials based on reversible emission transformation for potential application in sensors, anti-counterfeiting and information encryption.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Haorui Dong,Haiyan Zhao,Tongtong Xuan,Wenhao Bai,Tianyu Lin,Yixin Cai,Rong-Jun Xie
Lead halide perovskite nanocrystals (NCs) have been the star material in lighting and displays owing to their excellent photoelectrical properties, but they have not simultaneously realized high photoluminescence quantum yield (PLQY) and high stability. To solve this problem, we propose a perovskite/linear low-density polyethylene (perovskite/LLDPE) core/shell NC by the synergistic role of the pressure effect and steric effect. Green CsPbBr3/LLDPE core/shell NCs with near-unity PLQY and nonblinking behavior were synthesized through an in situ hot-injection process. The mechanism of the improved photoluminescence (PL) properties is the enhanced pressure effect resulting in increased radiative recombination and interaction between the ligand and perovskite crystals, as confirmed by the PL spectra and finite element calculations. Meanwhile, the NCs show high stability under ambient conditions (with a PLQY of 92.5% after 166 days) and against 365 nm UV light (maintaining 61.74% of the initial PL intensity after continuous radiation for 1000 min). This strategy also works well in the blue and red perovskite/LLDPE NCs and red InP/ZnSeS/ZnS/LLDPE NCs. Finally, white-emitting Mini-LEDs were fabricated by combining the green CsPbBr3/LLDPE and red CsPbBr1.2I1.8/LLDPE core/shell NCs with blue Mini-LED chips. The white-emitting Mini-LEDs exhibit super wide color gamut (∼129% of the National Television Standards Committee or 97% of the Rec. 2020 standards).
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Small
·
2023
·
IF 13.3
Yue Wu,Tianzhe Zhao,Xiao Shao,Junyu Chen,Tianyong Zhang,Bin Li,Shuang Jiang
Chiral inorganic quasi-2D perovskites are prepared by self-assembling 3D perovskites in solution for the first time. The quasi-2D perovskite synthesized is a pure-phase perovskite with < n > = 3 and is periodically arranged, which is a big breakthrough in quasi-2D inorganic perovskites. With the individual chiral CsPbBr 3 nanocrystals (NCs) assemble into quasi-2D perovskite, the g-factor significantly improved (≈5 × 10 −3 ). In addition, the chiroptical activity of quasi-2D perovskites is explored to be improved with the lateral size increasing. In the first stage of assembly, chiral optical activity is increased due to the lateral size-dependent optical activity, while the changes in the later stages are attributable to the chiral morphology. Interestingly, chirality inversion is found to be correlated to the number of ligands. It is believed that different conformers of chiral ligands caused by steric hindrance of the original ligand oleylamine result in opposite circular dichroism (CD) polarities. The chirality inversion phenomenon is universal, regardless of the choice of ligands. This work opens up a new path for the synthesis of quasi-2D perovskites and provides more opportunities for the modulation of chiral optical activity.
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Journal of Physical Chemistry C
·
2023
·
IF 3.7
Wei Zhang,Dengfeng Luo,Shao-Fei Ni,Shunli Chen,Limei Cha,Ming-De Li,Li Dang
The combination of inorganic perovskite and graphene oxide has been demonstrated to be an efficient strategy for obtaining excellent optical and electrical properties. In this work, high-quality CsPbBr3 nanocrystals are loaded on graphene oxide (GO) to form GO-CsPbBr3 nanocomposites by post-mixing of the two materials. The photoluminescence spectra indicated that GO could dramatically quench the luminescence of the pristine-CsPbBr3 nanocrystals in the GO-CsPbBr3 nanocomposites, which is probably induced by the fast separation and transfer of the photogenerated hole–electron pair. The fast separation and transfer of the photogenerated hole–electron pair between GO and CsPbBr3 nanocrystals have been confirmed by an ultrafast transient absorption study, and a lifetime τ = 18.6 ± 4.1 ps of electron transfer from CsPbBr3 nanocrystals to GO could be obtained. In addition, the GO could significantly boost the photocurrent intensity; the photocurrent of GO-CsPbBr3 nanocomposites is about 2.5 times that of the pristine-CsPbBr3 nanocrystals. Photoelectrochemical switching on and off can be achieved by using intermittent visible light exposure. These results reveal that GO may act as an electron collector to extract electrons from CsPbBr3 nanocrystals, suggesting a new potential application of GO-CsPbBr3 nanocomposites for photocatalysis.
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