Nature Electronics
·
2024
·Vol. 7
·期 6
·487-496
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IF 33.7
Gao Yun,Li Hongjin,Dai Xingliang,Ying Xingjian,Liu Zhe,Qin JiaJun,Guo Jie,Han Zhongkang,Zhang Yujing,Zhu Meiyi,Wu Xiaohui,Cai Qiuting,Yang Yixing,Feng Linrun,Zhang Xiaoyu,Huang Jingyun,He Haiping,Gao Feng,Ye Zhizhen
Perovskite light-emitting diodes (PeLEDs) could be of use in the development of active-matrix displays. However, due to ion migration in crystal structure, PeLEDs have electroluminescence rise times over milliseconds, which is problematic for the development of high-refresh-rate displays. Here, we show that the electroluminescence rise time of PeLEDs can be reduced to microseconds using an individual-particle passivation strategy. The approach is based on BF 4 − ions that can passivate every nanocrystal in a perovskite emissive layer during film deposition. It leads to a defect-free film with discrete nanostructure and excellent crystallinity, which inhibits ion migration. Our strategy can be applied in perovskite nanocrystal films with different colours: red (635 nm), green (520 nm) and blue (475 nm). These PeLEDs all demonstrate response times within microseconds and high external quantum efficiencies of 22.7%, 26.2% and 18.1%, respectively. This allows us to create microsecond-response active-matrix PeLEDs that exhibit external quantum efficiencies above 20% at a display brightness of 500–3,000 cd m −2 for green devices with a resolution of 30 pixels per inch. We also develop microsecond-response red, green and blue active-matrix displays with 90 pixels per inch.
研究领域:
材料科学
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光电技术
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显示技术
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DOI
高影响因子
POLYHEDRON
·
2024
·
IF 2.4
Meng Zhao,Yun Yang,Xue-Song Gu,Lanlan Sun
The separation and purification of light hydrocarbons are performed by energy-intensive distillation processes. Microporous metal–organic framework based absorbents acting as alternative technology gains focus. Open metals sites (OMSs) enriched MOF-74 show great potential in light hydrocarbons but its separation selectivity is low and difficult to regenerate. To address this issue, we introduced N -donor ligands into open sites of Co-MOF-74 by post modification. Structure was determined by powder X-ray diffraction, element analysis, infrared spectroscopy and thermogravimetric analyses. As-synthesized modified Co-MOF-74 display potential in C 2 H 4 /C 2 H 6 , C 3 H 6 /C 3 H 8 , C 3 H 8 /CH 4 and C 2 H 6 /CH 4 separation for N -donor ligands placeholder.
研究领域:
材料科学
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化学工程
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高影响因子
Inorganic Chemistry Frontiers
·
2024
·
IF 6.1
Lunyao Pan,Wen Li,Xiankan Zeng,Maolin Mu,Qungui Wang,Yongjian Chen,Chenglong Li,Shiyu Yang,Linzhu Dai,Li Tao,Weiqing Yang
Inorganic Cu2ZnSnS4 (CZTS) has garnered significant attention in the field of solar cells owing to its high hole mobility, suitable optical bandgap, cost-effective and earth-abundant elemental constituents. In particular, the deeper highest occupied molecular orbital (HOMO) of CZTS makes it an alternative for the traditional organic hole transport layer (HTL) material poly(3,4-ethyllenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), which can suppress acidic interface and hygroscopic problem in perovskite light-emitting diodes (PeLEDs). Herein, we demonstrate CZTS as a novel inorganic HTL for green FAPbBr3 PeLEDs, achieving a peak external quantum efficiency (EQE) of 7.59% and a maximum luminance of 27 000 cd m−2 (emitting at 529 nm). The fluorescence properties of the perovskite films and interfacial behaviors of CZTS/FAPbBr3 were investigated through surface state regulation of CZTS HTL. High hole mobility (0–30 cm2 V−1 s−1) of CZTS HTL and low hole injection barrier (∼0.13 eV) between CZTS and perovskite endow the CZTS-based PeLEDs with enhanced hole transport capability and suppressed interfacial carrier accumulation. In addition, an attractive cost-effectiveness advantage of about $0.24 per g synthesizing CZTS makes it a promising competitor to mainstream organic HTL materials such as PEDOT:PSS (∼$1.3 per g). An in-depth understanding of this novel CZTS HTL makes an essential step forward for the commercialization of PeLEDs.
研究领域:
材料科学
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光电学
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半导体物理
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高影响因子
JOURNAL OF CHEMICAL PHYSICS
·
2024
·Vol. 160
·期 16
·
IF 3.1
Wang Yang,Liang Pan,Men Yumeng,Jiang Meizhen,Cheng Lin,Li Jinlei,Jia Tianqing,Sun Zhenrong,Feng Donghai
Chiral quantum dots (QDs) are promising materials applied in many areas, such as chiral molecular recognition and spin selective filter for charge transport, and can be prepared by facile ligand exchange approaches. However, ligand exchange leads to an increase in surface defects and reduces the efficiencies of radiative recombination and charge transport, which restricts further applications. Here, we investigate the light-induced photoluminescence (PL) enhancement in chiral L- and D-cysteine CdSe QD thin films, providing a strategy to increase the PL. The PL intensity of chiral CdSe QD films can be significantly enhanced over 100 times by continuous UV laser irradiation, indicating a strong passivation of surface defects upon laser irradiation. From the comparative measurements of the PL intensity evolutions in vacuum, dry oxygen, air, and humid nitrogen atmospheres, we conclude that the mechanism of PL enhancement is photo-induced surface passivation with the assistance of water molecules.
研究领域:
材料科学
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光学
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DOI
PubMed
高影响因子
ACS Energy Letters
·
2024
·
IF 19.3
Yudong Wang,Qiuxiang Yang,Yan Li,Lin Peng,Ce Zhang,ShouNian Cheng,Yu Han,Xia Cao
Electronic skin can convert mechanical stimuli into multimodal signals and can provide a cost-effective and complementary approach to environmental sensing. Here, light-emitting PVDF-HFP/GO-ZnS:Cu (PH-GZ) composite films were synthesized for visual triboelectric nanogenerators (TENGs), which can convert mechanical stimuli into both real-time photoemission and electric signals. The lower the trigger pressure threshold, the higher the sensitive response to subtle contact. Thus, the surface topography of approaching objects can be displayed visually with high brightness according to the physical contact. A quick-response safe drawer system was thus developed, relying on TENG-based personal information identification. Only when the obtained triboelectric–photoelectric signal matches the preset code can the drawer be opened. The as-designed durable visual TENGs with an open-circuit voltage of 32 V and a short-circuit current of 4.078 mA/m2 promote self-powered TENG applications in areas of personal information security and tactile sensing systems.
研究领域:
材料科学
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电子工程
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纳米技术
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高影响因子
Nature Chemistry
·
2024
·Vol. 16
·期 3
·373-379
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IF 19.2
Guan Yeqin,Wen Hong,Cui Kaixun,Wang Qianru,Gao Wenbo,Cai Yongli,Cheng Zibo,Pei Qijun,Li Zhao,Cao Hujun,He Teng,Guo Jianping,Chen Ping
Photon-driven chemical processes are usually mediated by oxides, nitrides and sulfides whose photo-conversion efficiency is limited by charge carrier recombination. Here we show that lithium hydride undergoes photolysis upon ultraviolet illumination to yield long-lived photon-generated electrons residing in hydrogen vacancies, known as F centres. We demonstrate that photon-driven dehydrogenation and dark rehydrogenation over lithium hydride can be fulfilled reversibly at room temperature, which is about 600 K lower than the corresponding thermal process. As light-driven F centre generation could provide an alternative approach to charge carrier separation to favour chemical transformations that are kinetically or thermodynamically challenging, we show that light-activated lithium hydride cleaves the N≡N triple bond to form a N–H bond under mild conditions. Co-feeding a N 2 /H 2 mixture with low H 2 partial pressure leads to photocatalytic ammonia formation at near ambient conditions. This work provides insights into the development of advanced materials and processes for light harvesting and conversion.
研究领域:
化学
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材料科学
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催化
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光化学
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DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
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2024
·
IF 8.3
Li Su,Zijun Hu,Tingting Yan,Xinglong Zhang,Dawei Zhang,Xiaosheng Fang
With the development of artificial intelligence systems, it is necessary to develop optoelectronic devices with photoresponse and storage capacity to simulate human visual perception systems. The key to an artificial visual perception system is to integrate components with both sensing and storage capabilities of illumination information. Although module integration components have made useful progress, they still face challenges such as multispectral response and high energy consumption. Here, we developed a light-adapted optoelectronic-memristive device integrated by an organic photodetector and ferroelectric-based memristor to simulate human visual perception. ITO/P3HT:PC71BM/Au as the light sensor unit shows a high on/off ratio (Iph/Id) reaching ∼5 × 104 at 0 V. The memristor unit, consisting of ITO/CBI@P(VDF-TrFE)/Cu, has a RON/ROFF ratio window of ∼106 under 0.05 V read voltage and ultralow power consumption of ∼1 pW. Moreover, the artificial visual perception unit shows stable light-adapted memory windows under different wavelengths of irradiation light (400, 500, and 600 nm; they meet the spectral range of human visual recognition) and can clearly identify the target image (“T” shape) because of the apparent contrast, which results from the high ROFF/RON ratio values. These results provide a potential design strategy for the development of intelligent artificial vision systems.
研究领域:
生物医学工程
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人工智能
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材料科学
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PubMed
高影响因子
Nano-Micro Letters
·
2025
·Vol. 17
·期 1
·1-15
·
IF 36.3
Dong Kailian,Jiang Tao,Chen Guoyi,Cui Hongsen,Wang Shuxin,Zhou Shun,Wang Chen,Yang Yi,Yao Fang,Tao Chen,Ke Weijun,Fang Guojia
The light management strategy is introduced into two-dimensional Dion-Jacobson (2D DJ) perovskite and subsequently elucidated both experimentally and theoretically.
The synthesis of surface-patterned BDAPbBr 4 microplates with high crystalline quality demonstrates the first reported instance of growing such 2D DJ-type perovskite microplates.
The optimized device exhibits excellent photodetection performance under UV region. Moreover, this work represents the successful demonstration of BDAPbBr 4 perovskite for UV weak-light communication, imaging, and polarized light detection.
研究领域:
材料科学
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光学工程
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DOI
PubMed
高影响因子
ARCHIVES OF INSECT BIOCHEMISTRY AND PHYSIOLOGY
·
2024
·Vol. 117
·期 2
·e70001
·
IF 1.5
Qimeng He,Hui Jin,Jie Shen
Short-wavelength blue light is ubiquitous in daily life and has a lasting destructive influence. Its potential harm to biological health is significant. This study used Drosophila as a model organism to investigate the protective effects of kaempferol, a flavonoid, against the toxicity of blue light. It also examined its physiological effects on Drosophila under blue light irradiation. In this experiment, fruit flies were fed with three different concentrations of kaempferol solutions (0.1, 0.01, and 0.001 mol/L) dissolved in food. The survival rate and physiological indexes of Drosophila were investigated under blue light irradiation of 2500 lux. The results showed that 0.1 mol/L kaempferol increased the activity of male flies during the day and significantly extended the male survival time under blue light irradiation. However, the study found that kaempferol did not significantly prolong the survival time of Drosophila in the oxidative stress experiment, and no significant difference was observed in the feeding experiment. In summary, our research found that kaempferol, at the concentration of 0.1 mol/L, has a protective effect on Drosophila under blue light irradiation, potentially achieved through alterations in circadian rhythm. Summary Kaempferol protects Drosophila from blue light damage. The effect of kaempferol on Drosophila exhibits sex-specific responses. Kaempferol enhances daytime activity and extends the lifespan of male Drosophila .
研究领域:
生物学
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毒理学
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分子生物学
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PubMed
高影响因子
ACS Applied Materials & Interfaces
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2024
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IF 8.3
Kaiyu Yang,Xukeng Weng,Jiahuan Feng,Yongshen Yu,Baolin Xu,Qiuxiang Lin,Qingkai Zhang,Jiaqing Zhuang,Wenjun Hou,Xiaolin Yan,Hailong Hu,Fushan Li
Quantum dot light-emitting diodes (QLEDs) have attracted increasing attention due to their excellent electroluminescent properties and compatibility with inkjet printing processes, which show great potential in applications of pixelated displays. However, the relatively low resolution of the inkjet printing technology limits its further development. In this paper, high-resolution QLEDs were successfully fabricated by electrohydrodynamic (EHD) printing. A pixelated quantum dot (QD) emission layer was formed by printing an insulating Teflon mesh on a spin-coated QD layer. The patterned QLEDs show a high resolution of 2540 pixels per inch (PPI), with a maximum external quantum efficiency (EQE) of 20.29% and brightness of 35816 cd/m2. To further demonstrate its potential in full-color display, the fabrication process for the QD layer was changed from spin-coating to EHD printing. The as-printed Teflon effectively blocked direct contact between the hole transport layer and the electron transport layer, thus preventing leakage currents. As a result, the device showed a resolution of 1692 PPI with a maximum EQE of 15.40%. To the best of our knowledge, these results represent the highest resolution and efficiency of pixelated QLEDs using inkjet printing or EHD printing, which demonstrates its huge potential in the application of high-resolution full-color displays.
研究领域:
材料科学
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显示技术
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纳米技术
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PubMed
高影响因子
Chemistry-An Asian Journal
·
2019
·Vol. 14
·期 12
·2138-2148
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IF 3.698
Zhiwei Cui,Jun Zhou,Teng Liu,Yicong Wang,Yue Hu,Ying Wang,Zhigang Zou
Graphical As easy as PI : A series of porphyrin-containing polyimide (PI) photocatalysts were synthesized by a one-step solvothermal method. The photodegradation activity for methyl orange (MO) under visible light was enhanced significantly, which is mainly attributed to the increased light harvesting accompanied by a varied HOMO level, and clarified by experimental results and theoretical studies. A series of porphyrin-containing polyimide (PI) photocatalysts were synthesized by a one-step solvothermal method. Characterization results revealed that porphyrin was uniformly coupled into the PI framework through covalent bonding and the visible-light absorption was greatly improved. The photodegradation activity of porphyrin-containing PIs for methyl orange (MO) under visible light was enhanced significantly, with the highest pseudo-first-order rate constant 35 times higher than that of neat porphyrin and 10 times higher than that of porphyrin-free PI. The enhancement is mainly attributed to an increased light harvesting accompanied by a varied HOMO level, which was clarified by control experiments, characterizations and theoretical calculations. This work provides an insight into multiple effects of dye molecules in dye-containing heterogeneous photocatalysts.
研究领域:
材料科学
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光催化
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有机化学
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DOI
高影响因子
LANGMUIR
·
2020
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IF 3.557
Tao Wang,Ran Kou,Jian Zhang,Renwei Zhu,Hongtao Cai,Guangming Liu
In this work, a negatively charged poly(3-sulfopropyl methacrylate potassium) (PSPMA) brush has been employed as a model system to demonstrate the tuning of the light response of strong polyelectrolyte brushes (SPBs) with counterions. The substitution of K+ counterions by azobenzene-containing counterions (Azo-N+) renders the PSPMA brush light-responsive in aqueous solutions. Nevertheless, the strength of the light response of the PSPMA brush is weak due to the inefficient disassembly of the micelle-like aggregates in the brush upon irradiation with ultraviolet light. Counterion mixtures of Azo-N+ and K+ are employed to realize a strong light response of the PSPMA brush by incorporating a reasonable amount of Azo-N+ counterions into the brush. The strength of the light response of the PSPMA brush can be tuned by the mole ratio of Azo-N+ to K+. Furthermore, properties including the hydration and conformation of the PSPMA brush can be reversibly switched via alternating ultraviolet and visible light irradiation. This work opens up the opportunities available for the use of counterions to tune the light response of SPBs.
研究领域:
材料科学
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化学
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DOI
高影响因子
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