SOLAR ENERGY
·
2021
·
IF 5.742
Honggang Xie,Jiannan Xu,Can Gao,Jiejing Zhang,Chunxiao Gao,Xizhe Liu
CsPbI 3 triggers strong interest in the photovoltaic community for their promising photoelectric property and nonvolatility. However, CsPbI 3 layers with a-phase crystal structure are difficult for preparation, and these layers easily degrade to non-photoactive δ-phase at room temperature. Tuning the composition of precursor solutions is an important method for improving the properties of CsPbI 3 layers. Herein, we prepare inorganic a-CsPbI 3 perovskite solar cells using lead acetate as the lead source, which is different from conventional precursors with lead iodide as the lead source. The lead acetate precursor needs neither incorporating hydrogen iodide nor preparing PbI 2 complex, and it is shown to enlarge the grain size, improve the crystallinity and reduce the trap density of CsPbI 3 layers. By cooperating the lead acetate precursor with EDAI 2 additive, the power conversion efficiency (PCE) of devices increases from 9.2% to 12.9% and the photo-stability of these devices is improved simultaneously.
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Wenbei Yu,Jing Liu,Ming Yi,Jiuxiang Yang,Wenda Dong,Chao Wang,Heng Zhao,Hemdan S.H. Mohamed,Zhao Wang,Lihua Chen,Yu Li,Bao-Lian Su
We report the well-designed active {1 1 0} and {1 1 1} faceted Cu 2 O hollow nanospheres (Cu 2 O-HNs) for the quick removal of the high concentration pollutants in water. For the first time, these Cu 2 O-HNs combine the advantages of the active facets, hollow structure and nanostructures. The abundance of dangling Cu atoms in two active facets results in positively charged surface to effectively react with the negatively charged pollutants. The hollow structure provides the opportunity to take full use of these active sites. Consequently, the active faceted Cu 2 O-HNs demonstrate excellent adsorption and photodegradation capacities for high concentrated anionic dyes. The smallest Cu 2 O-HNs (~100 nm) can adsorb ~90% of methyl blue (MB) (100 mg L −1 ) in 10 min and degrade ~92% of MB (100 mg L −1 ) in 10 min under visible-light. In particular, a film consisting of the smallest Cu 2 O-HNs can quickly remove high concentrated organic dyes and be reused after solar light irradiation for 10 min in air, showing the promising practical application for the removal of organic pollutants.
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高影响因子
NANOTECHNOLOGY
·
2017
·Vol. 28
·期 36
·365601
·
IF 3.44
Chun Sun,Xinyu Shen,Yu Zhang,Yu Wang,Xingru Chen,Changyin Ji,Hongzhi Shen,Hengchong Shi,Yiding Wang,William W Yu
By controlling the hydrolysis of alkoxysilanes, highly luminescent, transparent and flexible perovskite quantum dot (QD) gels were synthesized. The gels could maintain the structure without shrinking and exhibited excellent stability comparing to the QDs in solution. This in situ fabrication can be easily scaled up for large-area/volume gels. The gels integrated the merits of the polymer matrices to avoid the non-uniformity of light output, making it convenient for practical LED applications. Monochrome and white LEDs were fabricated using these QD gels; the LEDs exhibited broader color gamut, demonstrating better property in the backlight display application.
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高影响因子
Small Structures
·
2024
·
IF 13.9
Kaina Wang,Jipeng Fu,Hongliang Dong,Bingyu Huang,Jinru Liu,Long Tian,Jing Feng,Chunzhen Yang,Chenjie Lou,Ligang Xu,Tianyi Sun,Huajie Luo,Shiqing Xu,Guowei Yin,Hongjie Zhang,Mingxue Tang
Near-infrared (NIR) phosphors have been widely used in biomedical applications based on their deep tissue penetration. However, the lack of blue-pumped NIR phosphors with emission ranges beyond 1000 nm has greatly limited the development of NIR phosphor-converted light-emitting diodes (pc-LEDs). Herein, a facile way to boost the luminescence efficiency and thermal stability by introducing the promoters of Ce 3+ and Na + into Nd 3+ -doped SrS NIR phosphor is demonstrated, thus achieving light emitting at 850–1500 nm with a peak wavelength of ≈1070 nm. Through sensitization by the allowed 4 f → 5 d transition of Ce 3+ , the SrS: Nd 3+ phosphors are excitable by using a commercial blue LED, attributing to the effective energy transfer between Nd 3+ and Ce 3+ . Besides, the structural analysis and density functional theory calculations reveal the lattice distortion mechanism and geometry of doping ions contributed to the weakened thermal quenching effect and the increasing of internal quantum efficiency. The optimized NIR phosphor luminescence intensity remains at 91.8% of the initial intensity at 393 K, and the internal quantum efficiency increases to 42.8% from 31.7% of the sample without Na + doping. The present exploration of Nd 3+ -doped NIR phosphors will provide a reference for designing NIR pc-LEDs with enhanced properties.
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高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Wenbin Lin,Yi Xu,Jiyou Zhong
Near-infrared (NIR) phosphor-converted light-emitting diode (pc-LED) has been considered as a smart light source for NIR spectroscopy applications, leading to a growing need of developing broadband NIR phosphors. Herein, a new composition Zn 4 InSbO 8 :Cr 3+ phosphor with classical spinel-type structure was synthesized, which emits a broadband NIR light covering a region of 700–1200 nm with a peak centered at 860 nm under 460 nm excitation. The sample with an optimized Cr 3+ concentration possesses a full width at half maximum (FWHM) as broad as 180 nm mainly ascribing to multi crystallographic sites occupation. Moreover, the absorption efficiency (AE), internal quantum efficiency (IQE) and thermal stability were investigated to estimate the practicality. The relatively long-wavelength NIR emission produced by Cr 3+ in this spinel make it suitable for multi-functional applications. Finally, the asprepared phosphor combining with blue LED chip is used to fabricate a prototype NIR pc-LED, giving a NIR output power of 4.8 mW under 100 mA forward bias current with a photoelectric efficiency of 1.63%, showcasing the potential use of this material as a luminescent converter in the application of NIR pc-LEDs.
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高影响因子
OPTICAL MATERIALS
·
2021
·
IF 3.08
Xiaotong Gao,Zhilong Qin
Polymeric nanoparticles with near white fluorescence were prepared from melamine and glyoxal through solvothermal reaction in a single step. The colour of the fluorescence of the products was excitation wavelength dependent, which was near white under UV irradiation and gradually shifted to red when excitation wavelength shifted from 300 nm to 570 nm. The influence of the preparation conditions on the fluorescence intensity was investigated and the morphology of the products was confirmed by HRTEM and AFM. The size of the particles was mainly in 30–80 nm range. A quantum yield of 22% could be achieved under the optimum condition. FTIR and NMR indicated that the products were typical Schiff-base networks. Effect of solvents on the fluorescence property was also examined and the strongest emission was obtained in DMSO . To verify the origin of the different colour of the fluorescence, the products were analyzed using electrophoretic methods and the results indicated that dependence of the emission colour was not correlated to the variation of the particle size. The possible origin of the fluorescence was also proposed and the products can be non-toxic alternatives of inorganic quantum dots for white light emission.
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高影响因子
LANGMUIR
·
2024
·
IF 3.7
Hai-Tao Ren,Chao-Chen Cai,Peng-Yue Zhu,Cong Wang,Song-Hai Wu,Yong Liu,Xu Han
Photocatalytic technology is a popular research area for converting solar energy into environmentally friendly chemicals and is considered the greenest approach for producing H2O2. However, the corresponding reactive oxygen species (ROS) and pathway involved in the photocatalytic generation of H2O2 by the Bi2.15WO6-glucose system are still not clear. Quenching experiments have established that neither •OH nor h+ contribute to the formation of H2O2, and show that the formed surface superoxo (≡Bi–OO•) and peroxo (≡Bi–OOH) species are the predominant ROS in H2O2 generation. In addition, various characterizations indicate the enhanced electron-transfer on the surface of Bi2.15WO6 with increasing contents of glucose via the ligand-to-metal charge transfer pathway, confirming H-transfer from glucose to ≡Bi–OO• or ≡Bi–OOH. The increased production of H2O2 with decreasing bond dissociation energy (BDEO–H) values of various phenolic compounds again supports the H-transfer mechanism from phenolic compounds to ≡Bi–OO• and then to ≡Bi–OOH. DFT calculations further reveal that on the Bi2.15WO6 surface, oxygen is sequentially reduced to ≡Bi–OO• and ≡Bi–OOH, while H-transfer from H2O or glucose to ≡Bi–OO• and ≡Bi–OOH, resulting in the production of H2O2. The lower energy barrier of H-transfer from adsorbed glucose (0.636 eV) than that from H2O (1.157 eV) indicates that H-transfer is more favorable from adsorbed glucose. This work gives new insight into the photocatalytic generation of H2O2 by Bi2.15WO6 in the presence of glucose/phenolic compounds via the H-abstraction pathway.
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DOI
PubMed
高影响因子
Water Cycle
·
2023
·
IF 0
Jiaolong Zhang,Shuting Gou,Zhe Yang,Chaolin Li,Wenhui Wang
The application of promising g-C 3 N 4 has been limited by poor photogenerated electron-hole separation and limited absorption for visible light. Sulfamethoxazole (SMX) is a typical antibiotic drug that is used worldwide and hard to be disposed through conventional wastewater treatment methods. Herein, S-scheme Fe 2 O 3 /g-C 3 N 4 heterojunction was successfully prepared via a facile one-step sintering method and applied to photodegrade SMX under visible light irradiation. The integration of Fe 2 O 3 and g-C 3 N 4 shows superior charge separation and light absorption ability. As a result, the removal efficiency of 11 wt% Fe 2 O 3 /g-C 3 N 4 reaches to 99.2% within 30 min, which is visibly higher than 59.5% of pure g-C 3 N 4 . ·O 2 − and ·OH are demonstrated to be the predominant active species for SMX photodegradation, and the possible degradation pathway is also proposed based on electronic band structure of Fe 2 O 3 /g-C 3 N 4 heterojunction. This study presents a facile construction of g-C 3 N 4 based S-scheme photocatalyst and offers an environmentally friendly approach to effectively remove organic pollutants using renewable solar energy.
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DOI
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Jiajia Wang,Li Li,Ruyi Wei,Renfeng Dong
Here, we report the first PbS quantum dot (QD)-based micromotors with NIR-I light-driven photocatalytic propulsion and NIR-II fluorescence. Under the irradiation of NIR-I light (808 nm), PbS QD-doped cuprous oxide (Cu2O@PbS) micromotors can display efficient propulsion in a variety of biocompatible fuels such as malic acid, glucose, and urea. Among them, the Cu2O@PbS micromotors exhibit the best propulsion performance in a very low concentration of malic acid, with an average speed as high as 11.86 μm/s. The enhanced NIR-I photocatalytic activity of Cu2O@PbS micromotors benefits from the doping of NIR-I PbS QDs that can be excited by NIR-I light and exhibit high electron transport efficiency. The doped PbS QDs can effectively increase the absorption efficiency of the micromotors in the NIR-I region while also inhibiting the recombination of photogenerated electron–hole pairs. Interestingly, due to the presence of NIR PbS QDs, the Cu2O@PbS micromotors demonstrate prominent and stable NIR-II fluorescence (emission wavelength: 1100 nm), which offer promising potential for visualization of their position in vivo. In comparison to other photocatalytic micromotors, the simple fabrication strategy, excellent NIR-II fluorescence, together with the NIR-I light-dependent propulsion behavior of the current Cu2O@PbS micromotors, thus pave the way for further development of advanced smart “robots” for intelligent biomedical applications.
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高影响因子
Research
·
2021
·
IF 0
Wei Shen,Jianbin Zhang,Ruimin Dong,Yanfeng Chen,Liu Yang,Shuo Chen,Zhan Su,Yujun Dai,Kun Cao,Lihui Liu,Shufen Chen,Wei Huang
α-CsPbI3 nanocrystals (NCs) with poor stability prevent their wide applications in optoelectronic fields. Ca2+ (1.00 Å) as a new B-site doping ion can successfully boost CsPbI3 NC performance with both improved phase stability and optoelectronic properties. With a Ca2+/Pb2+ ratio of 0.40%, both phase and photoluminescence (PL) stability could be greatly enhanced. Facilitated by increased tolerance factor, the cubic phase of its solid film could be maintained after 58 days in ambient condition or 4 h accelerated aging process at 120°C. The PL stability of its solution could be preserved to 83% after 147 days in ambient condition. Even using UV light to accelerate aging, the T50 of PL could boost 1.8-folds as compared to CsPbI3 NCs. Because Ca2+ doping can dramatically decrease defect densities of films and reduce hole injection barriers, the red light-emitting diodes (LEDs) exhibited about triple enhancement for maximum the external quantum efficiency (EQE) up to 7.8% and 2.2 times enhancement for half-lifetime of LED up to 85 min. We believe it is promising to further explore high-quality CsPbI3 NC LEDs via a Ca2+-doping strategy.
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DOI
Biosurface and Biotribology
·
2019
·Vol. 5
·期 2
·46-51
·
IF 0
Jiao Wang,Chengzhen Chu,Yang He,Tao Xiang,Shaobing Zhou
The surface topography has a great effect on the behaviour of adherent cells. We report an efficient method to prepare shape memory surfaces with dynamically changed micropatterns, which can be induced by near-infrared (NIR) light by varying the power density. After polydopamine (PDA) was coated on the cross-linked polyethylene glycol-poly(ɛ-caprolactone), the surface temperature increases by 40°C at room temperature when 808 nm light with 1.0 W/cm 2 is used because of the photothermal properties of PDA. This temperature increase is enough for the shape recovery of the pressed micropatterns. The depth of the recovered micropatterns is controllable by adjusting the power density of the 808 nm light. The NIR-induced micropatterns efficiently regulate the morphology and alignment of endothelial cells. Therefore, NIR-induced shape memory surfaces have the potential to be used in remote-controlled devices.
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DOI
Science Advances
·
2024
·Vol. 10
·期 18
·
IF 11.7
Ji Jiang,Mingming Shi,Zhengchang Xia,Yong Cheng,Zema Chu,Wei Zhang,Jingzhen Li,Zhigang Yin,Jingbi You,Xingwang Zhang
Perovskite light-emitting diodes (PeLEDs) have attracted great attention in recent years; however, the halogen vacancy defects in perovskite notably hamper the development of high-efficiency devices. Previously, large-sized passivation agents have been usually used, while the effect of defect passivation is limited due to the weak bonding or the large space steric hindrance. Here, we predict that the ultrasmall-sized formate (Fa) and acetate (Ac) have more efficient passivation ability because of the stronger binding with the perovskite, as demonstrated by density functional theory calculation. We introduce ultrasmall-sized cesium salts (CsFa/CsAc) into buried interface, which can also diffuse into the bulk, resulting in both buried interface and bulk passivation. In addition, the improved perovskite growth has been found due to the enhanced hydrophily after introducing CsFa/CsAc as additive. According to these advantages, a pure-red PeLED with 24.2% efficiency at 639 nm has been achieved.
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高影响因子
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