JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Bowang Shu,Yajing Chang,Li Dong,Leilei Chen,Huijuan Wang,Supeng Yang,Jinhua Zhang,Xiaopeng Cheng,Dabin Yu
CsPbBr 3 perovskite quantum dots (PQDs) have drawn much attention for their high photoluminescence quantum yield and great potential in optoelectronic applications. However, they suffer from poor stability under humid condition. This paper reports CsPbBr 3 PQDs incorporated in aluminum stearate (AlSt 3 ) matrix via an improved co-precipitation approach, in which AlSt 3 not only acted as hydrophobic matrix to protect CsPbBr 3 PQDs from surrounding environment, but also passivated the surface of PQDs via the coordination bond of St-Cs and St-Pb, as well as bond between Al 3+ and Br − . By this method, the as-synthesized CsPbBr 3 -AlSt 3 composites exhibited excellent stability in ambient condition even directly in water for more than 60 days. With the CsPbBr 3 -AlSt 3 composites (green emission) used as color-conversion layer, a white light-emitting diode (WLED) was fabricated with a high color rendering index (Ra) of 90 and a low color temperature (Tc) of 4929 K. These results suggest that this method pave an effective way to stabilize CsPbBr 3 PQDs, which is of great importance for their further application.
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高影响因子
INORGANIC CHEMISTRY
·
2021
·
IF 5.165
Xing-Zhou Lu,Chao Gu,Qi Zhang,Lei Shi,Shi-Kui Han,Guan-Ping Jin
Engineering nanoheterostructures (NHs) plays a key role in exploring novel or enhanced physicochemical properties of nanocrystals. Despite previously reported synthetic methodologies, selective synthesis of NHs to achieve the anticipated composition and interface is still challenging. Herein, we presented a colloidal strategy for the regioselective construction of typical Ag–Co2P NHs with precisely controlled location of Ag nanoparticles (NPs) on unique chemically transformed Co2P nanorods (NRs) by simply changing the ratio of different surfactants. As a proof-of-concept study, the constructed heterointerface-dependent hydrogen evolution reaction (HER) catalysis was demonstrated. The multiple Ag NP-tipped Co2P NRs exhibited the best HER performance, due to their more exposed active sites and the synergistic effect at the interfaces. Our results open up new avenues in rational design and fabrication of NHs with delicate control over the spatial distribution and interfaces between different components.
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PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Ya Chu,Chao Wang,Linlin Ma,Xia Feng,Beibei Wang,Yanqing Wu,Yan Jia,Mingshui Zhang,Yan Sun,Haoyue Zhang,Guangjiu Zhao
In this work, we have first demonstrated that the potassium cation doping effect on photoluminescence (PL) regulation of CH 3 NH 3 PbBr 3 (CH 3 NH 3 + =MA + ) colloidal perovskite quantum dots (QDs) is significantly different from the other alkali cation doping effects. The PL intensity will be generally enhanced with the increase doping amounts of other alkali cations. Herein, we have unveiled that the PL of the potassium-doped perovskite QDs is initially prompted by the potassium ions doping and then inhibited with further growing doping amount of the potassium ions. Furthermore, we have also demonstrated that the PL inhibition phenomenon is ascribed as quick trapping of redundant photogenerated electrons by the trap states after huge amount doping besides defect passivation and octahedral structure distortion induced by the initial doping. At the same time, the specific excited state transient absorption and the lifetime of MA x K 1-x PbBr 3 also confirm that the radiation recombination process is enhanced via defect passivation and lattice distortion, which is induced by moderate potassium cations doping. In addition, the PL of colloidal perovskite quantum dots can be adjusted from orange to cyan within the wavelength range of 300 nm − 600 nm and exhibit better stability.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Qingyun He,Enrou Mei,Xiaojuan Liang,Weidong Xiang
Here, polyvinyl butyral (PVB) films-protected CsPbBr 3 /Cs 4 PbBr 6 halide perovskite solids (HPSs) were successfully synthesized. The optical properties and structure of HPSs@PVB were studied, finding the photoluminescence quantum yields (PLQYs) of this novel composite material is as high as 60.4%. More importantly, HPSs@PVB has excellent thermal cyclability, water and ultraviolet (UV) resistance. In addition, HPSs@PVB was further applied to light emitting diodes (LEDs) and displays. By combining green-emitting HPSs@PVB and red-emitting CsPbBrI 2 NCs@PVB with InGaN 460 nm blue chip, white light emitting diode (WLED) device can be successfully fabricated. And the device exhibits good stability and the color gamut is as wide as 126%, reaching 94% of Rec. 2020. This work proposes a simple approach to solve the challenging stability issue of perovskite nanocrystals (NCs), having a positive implication for their practical application in LEDs and display backlights.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Shuang Zhou,Qiying Wang,Zhendong Xu,Shenke Xu,Peiyi Yang,Hao Deng,Bobo Li,Yifan Dong,Peigang Han,Yaorong Su
Exploring high performance photocatalysts is of great importance to relieve the environment pollution issues. In this paper, we introduce a facile antisolvent solvothermal method to synthesize methylammonium lead tribromide perovskite (MAPbBr 3 ) nanocrystals and successfully employ them as efficient photocatalysts. Compared to the room temperature synthesized MAPbBr 3 (RT-MAPbBr 3 ), the antisolvent solvothermal synthesized MAPbBr 3 (AS-MAPbBr 3 ) has multiple outstanding properties, such as improved crystallinity with lower grain boundary density, enhanced light absorption in visible range, suitable band gap of 2.31 eV and extended photoluminescence (PL) lifetime as long as 2627.82 ns. By taking advantages of the above merits, the AS-MAPbBr 3 exhibits efficient photocatalytic performance by decomposition of methyl orange under solar light. A high apparent rate constant of 101.2 × 10 −3 is achieved along with excellent cyclability, which significantly outperforms the RT-MAPbBr 3 (56.0 × 10 −3 ) and P25 (16.5 × 10 −3 ). The underlying mechanism for MO photocatalytic degradation is deeply explored and proposed. Our present study suggests that the antisolvent solvothermal method can be a promising method to synthesize perovskite nanocrystals, and might also provide some insights in developing a series of high performance perovskite based photocatalysts.
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PubMed
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Fangying Juan,Yangqing Wu,Beibei Shi,Mingxu Wang,Mei Wang,Fan Xu,Jinbiao Jia,Haoming Wei,Tengzhou Yang,Bingqiang Cao
Improvements in the light-harvesting capacity and the carrier extraction are both significant to improve the photovoltaic performance of perovskite solar cells (PSCs). It has been proved that local surface plasmon resonance (LSPR) based on metallic nanostructures is practical for capturing light to enhance light harvesting. Motivated by this, a special shaped Au nanoparticle, e.g., nanooctahedrons (Au NOs), with a broadband LSPR peak and a suitable size is controlled synthesized and applied in a PSCs device. The power conversion efficiency of PSCs is increased from 16.95 to 19.05% with a short-circuit current density (Jsc) as high as 23.63 mA/cm2. Besides the enhanced light-trapping effect of Au NOs LSPR proved by optical spectroscopy analysis, the Kelvin probe force microscopy results show that Au NOs can also effectively reduce the surface potential of the electron transport layer, which promotes effective photocarrier extraction at the interfaces. This paper sheds light on the question of how plasmon excitation and light localization might be used advantageously in high-efficiency photovoltaics.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Tao Wang,Sumin Hou,Huafang Zhang,Yi Yang,Wen Xu,Tianyong Ao,Miao Kang,Gencai Pan,Yanli Mao
Low-dimensional organic-inorganic hybrid perovskite materials have attracted much attention in photoelectric devices due to their exotic performance in optoelectronics compared with their bulk and thin-film counterparts. In this article, using a simple ligand-assisted deposition method, we successfully synthesized uniform methylammonium lead iodide (MAPbI 3 ) perovskite nanorods, nanotriangles and nanocubes, and investigated their photoelectric properties after fabricated into photodetectors (PDs) on SiO 2 /Si substrates. It is found that the synthesized MAPbI 3 nanorods not only have extremely small optical band gap (minimum of ~1.36 eV), but also have long photoluminescence (PL) lifetime (longest of ~7.81 μs) and high absolute PL quantum yields (maximum of ~ 45%), and the PL lifetime is more than about one order of magnitude higher than that the reported previously. The PDs based on MAPbI 3 nanorods presented a wide spectral response “window” from 350 to at least 950 nm, and exhibited a photoresponsivity of 12.2 mA/W, a detectivity of 2.67 × 10 11 Jones, the on/off ratio of more than 800, the rise/decay time constants of 18/25 ms, under the excitation at 405 nm. Further analysis suggests that the dramatically improved photo-electric conversion properties of the nanorods PDs could be closely related with their morphology dependent properties, including bandgap, PL lifetime, trap density (n trap ) and carrier concentration. These results provide a simple and effective method for preparing different morphology low-dimensional MAPbI 3 , and discuss the mechanism of morphology-dependent photoelectric performance of PDs, which is of great significance for potential applications in the field of photoelectronic devices.
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高影响因子
Advanced Composites and Hybrid Materials
·
2021
·Vol. 4
·期 2
·392-400
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IF 5.693
Zeng Xiangyang,Luo Qiang,Li Jinyang,Li Yilan,Wang Wei,Li Yunhong,Wu Ronggen,Pan Duo,Song Gang,Li Jianbao,Guo Zhanhu,Wang Ning
Counter electrode at the cathode side of sensitized solar cells (SSCs) plays a critical key role in determining the device performance. Active and stable counter electrodes that can work over a wide range of electrolyte systems are highly desired for SSCs. Here, we report a mixed ternary pentlandite, Ni 3 Co 6 S 8 , as an efficient multifunctional counter electrode for SSCs with various redox mediators (I 3 − /I − , T 2 /T − , Co(bpy) 3 3+/2+ and S n 2− /S 2− ). Ni 3 Co 6 S 8 shows not only similar catalytic activity to Pt for I 3 − /I − redox shuttle but also superior catalytic activity for T 2 /T − , Co(bpy) 3 3+/2+ , and S n 2− /S 2− redox mediators. Furthermore, SSCs assembled with Ni 3 Co 6 S 8 also exhibit good performance preservation in conjunction with various electrolyte systems. This work highlights that SSCs are fully compatible with pentlandites and paves the way towards the realization of high efficiency and stable SSCs. Graphical abstract Ni 3 Co 6 S 8 demonstrates excellent catalytic activity towards various redox mediators, highlighting the full compatibility of pentlandites with sensitized solar cells.
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高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 15
·5182-5189
·
IF 7.393
Liang Bao,Wenqiang Liu,Yonghua Chen,Yanbo Zhang,Yang Zhang
The local surface plasmon resonance effect induced by metal nanoparticles on perovskites provides a powerful approach to enhance the photoluminescence of such all-inorganic systems. Here, we show that the decoration of CsPb(Br/Cl)3 nanocrystals (NCs) with Au nanoparticles (NPs) leads to a significant enhancement of the blue emission centered at 465 nm, resulting in a photoluminescence quantum yield (PLQY) of up to 73%. Our simulations based on finite difference time domain (FDTD) analysis indicate that the distance between the Au NPs and CsPb(Br/Cl)3 NCs plays a crucial role in determining the local electric field intensity. Our data suggest that an excessive decoration of CsPb(Br/Cl)3 NCs with Au NPs can also reduce the PLQY, as a result of decreased coupling strength.
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Advanced Optical Materials
·
2021
·Vol. 9
·期 11
·2002130
·
IF 9.926
Qinggang Zhang,Weilin Zheng,Qun Wan,Mingming Liu,Xiuping Feng,Long Kong,Liang Li
For the display applications of perovskite nanocrystals (NCs), the photoluminescence quantum yield (PLQY), emission linewidth, and operational stability are the main parameters that directly affect the performance of the optoelectronic device. High-temperature solid-state synthesis has been regarded as an eco-friendlier process to prepare perovskite NCs than colloidal synthesis. However, it is relatively difficult to control the sizes and size distribution of NCs at high temperatures, which usually results in a lower PLQY and wider emission. Here, highly stable CsPbBr 3 NCs with a high PLQY up to 93% and a narrow emission linewidth of 18 nm are successfully prepared by a hard-template solid-state synthesis at high temperature (600 °C). It is found that the precisely confined growth of NCs in the thermally stable and uniform pores of the mesoporous silica (MS) template is the main reason to achieve the high PLQY and narrow emission, and the pre-hydrolysis sealing strategy contributes to the exceptional stability. More surprisingly, the emission peak intensity of CsPbBr 3 /MS@SiO 2 is 3.8 times higher than that of the commercialized silicate green phosphor when encapsulated on the blue-chip with the same absorbance at 450 nm, which makes it an ideal down-conversion emitter for display applications.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 19
·2011073
·
IF 18.808
Huiying Chen,Linlin Zhou,Zhi Fang,Shuize Wang,Tao Yang,Laipan Zhu,Xinmei Hou,Hailong Wang,Zhong Lin Wang
Inorganic lead halide perovskite has become an emerging material for modern photoelectric and electronic nanodevices due to its excellent optical and electronic properties. In view of its huge dielectric and electrical properties, inorganic CsPbBr 3 perovskite is introduced into the piezoelectric nanogenerator (PENG). Based on one-step electrospinning of solutions containing CsPbBr 3 precursors and polyvinylidene difluoride (PVDF), in situ growth of CsPbBr 3 nanocrystals in PVDF fibers (CsPbBr 3 @PVDF composite fibers) with highly uniform size and spatial distribution are synthesized. The CsPbBr 3 @PVDF composite fibers based PENG reveals an open-circuit voltage ( V oc ) of 103 V and a density of short-circuit current ( I sc ) of 170 µ A cm −2 , where the V oc is comparable to the state-of-the-art hybrid composite piezoelectric nanogenerators (PENGs) and the density of I sc is 4.86 times higher than that of lead halide perovskites counterpart ever reported. Moreover, CsPbBr 3 @PVDF composite fibers based PENG exhibits fundamentally improved thermal/water/acid–base stabilities. This study suggests that the CsPbBr 3 @PVDF composite fiber is a good candidate for fabricating high-performance PENGs, promising application potentials in mechanical energy harvesting and motion sensing technologies.
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APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Yabing Zhang,Teng Zhang,Hongbin Shi,Qing Liu,Tao Wang
Flexible conductive copper patterns with low electric resistance, good adhesion, and high stability were successfully prepared on heat-sensitive polyethylene terephthalate (PET) substrate by combining the inkjet print with copper nanoparticles (Cu NPs) conductive ink and electroless plating (ELP) copper at room temperature. The Cu NPs served as the catalysts to promote copper ions electroless deposition on PET surface. Dimethylaminoborane (DMAB) was used as the reductant to place poisonous formaldehyde in the electroless plating process. The Cu patterns had a strong adhesion with PET substrate modified by 3-Mercaptopropyltriethoxysilane (MPTES) and would not fall even after 4000 cycles bending test. The electric resistivity of patterns could be as low as 5.43 μΩ·cm, which is about three times that of bulk copper. The minimum sheet resistance of the patterns was 54 mΩ/sq and had little change in the atmosphere for five months, that showed the patterns had an excellent anti-oxidation performance.
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高影响因子
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