Nature Communications
·
2024
·Vol. 15
·期 1
·1-8
·
IF 14.7
Wang Xingzhi,Gao Yan,Liu Xiaonan,Xu Huaiyu,Liu Ruixiang,Song Jiaojiao,Li Bo,Shen Huaibin,Fan Fengjia
High-energy exciton emission could allow single-component multi-colour display or white light-emitting diodes. However, the thermal relaxation of high-energy excitons is much faster than the photon emission of them, making them non-emissive. Here, we report quantum dots with light hole-heavy hole splitting exhibiting strong high-energy exciton electroluminescence from high-lying light holes, opening a gate for high-performance multi-colour light sources. The high-energy electroluminescence can reach 44.5% of the band-edge heavy-hole exciton emission at an electron flux density Φ e of 0.71 × 10 19 s −1 cm −2 − 600 times lower than the photon flux density Φ p (4.3 × 10 21 s −1 cm −2 ) required for the similar ratio. Our simulation and experimental results suggest that the oscillator strength of heavy holes reduces more than that of light holes under electric fields. We attribute this as the main reason for strong light-hole electroluminescence. We observe this phenomenon in both Cd x Zn 1-x Se-ZnS and CdSe-CdS core-shell quantum dots exhibiting large light hole-heavy hole splittings.
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2024
·
IF 4.1
Zhu Qing-Li,Cheng Han-Lei,Liu Wei-Xuan,Xiao Yin-Bin,Wu Xin-Lei,Breu Josef,Hong Wei,Wang Zhi-Jian,Zheng Qiang,Wu Zi-Liang
Achieving continuous motions typically requires dynamic external stimuli for cyclic deformation, or crafted geometries with intricate modules to form a self-regulated feedback loop upon static stimulation. It is still a grand challenge to realize self-sustained motion in soft robots subject to unchanging environment, without complex geometry or a control module. In this work, we report soft robots based on an anisotropic cylindrical hydrogel showing self-regulated, continuous rolling motions under constant light irradiation. The robots are animated by mirror-symmetry-breaking induced by photothermal strain gradient. The self-sustained motion is attributed to the fast and reversible deformation of the gel and the autonomous refresh of the irradiated region during the rolling motion. The hydrogel robots can reach a rolling speed of 1.27 mm·s −1 on a horizonal surface and even climb a ramp of 18° at a speed of 0.57 mm·s −1 in an aqueous environment. Furthermore, the hydrogel robots can overcome an obstacle, with rolling direction controllable through irradiation angle of the light and local irradiation on selective regions. This work suggests a facile strategy to develop hydrogel robots and may provide unforeseen inspirations for the design of self-regulated soft robots by using other intelligent materials.
✓ 已验证
DOI
高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 45
·e202404657
·
IF 1.9
Chenyue Zhao,Heran Yang,Shuo Hu,Yaqian Liu,Dongping Cheng,Xiaoliang Xu
Graphical In the presence of CBrCl3 and ruthenium photocatalyst, the corresponding dione was obtained by visible light induced oxidation of α-hydroxyl ketone derivatives with the yield of 49%–95%. It has the advantages of medium to excellent yield, good functional group tolerance, and mild reaction conditions. A visible light-induced oxidation of α-hydroxy ketone derivatives is reported, which is carried out in the presence of CBrCl 3 and ruthenium photocatalyst, and the corresponding diketones are obtained in 49-95% yields. This reaction has the advantages of moderate to excellent yields, good functional group tolerance, and mild reaction condition. The free radical reaction process was confirmed by the addition of radical scavenger 2,2,6,6-tetramethylpiperidi-1-oxy (TEMPO). The fluorescence quenching experiment indicated that CBrCl 3 was participated in the oxidation quenching cycle.
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CHEMISTRY
·
2018
·Vol. 36
·期 11
·1017-1023
·
IF 2.378
Bo Yang,Xiang Ren,Xuzhong Shen,Tongtong Li,Zhan Lu
A novel difunctionalization of unactivated alkenes has been reported via visible light-promoted three-component carboazidation using TMSN 3 and acrylonitrile as partners without any stoichiometric oxidants. This protocol is operationally simple for straightforward access to azido derivatives with good functional group tolerance from readily available starting materials. A facile azido radical-catalyzed [3 + 2] cycloaddition reaction of vinylcyclopropane with acrylonitrile was also observed to deliver a multi-substituted cyclopentane.
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yu Xu,Haoyu Qi,Mingming Sun,Zongxu Liu,Qing Liu,Kang Li,Wei Guo
While light-driven motors that can exhibit characteristic response have attracted significant research attention, they generally lack a stable and editable structure for exploration the versatile motions and their practical applications. Herein, a MXene/Polyurethane (PU) motor with robust “brick-and-mortar” structure was configured as the platform to study the light-driven self-propelled behaviors and mechanisms. Our experimental and theoretical results demonstrated that the external near-infrared laser (NIR) light stimulus triggers the photothermal Marangoni effect to create the local difference in surface tension, which serves as the driving force to overcome the flow resistance. The MXene/PU motor floating on the water phase exhibited programmable motion under the irradiation of NIR light, especially, complex motions such as directed motion, clockwise and counterclockwise rotations, and intermittent motion (alteration between resting and moving states). More interestingly, the MXene/PU motor can not only move along any complicated routes such as maze but also execute the stir task at designated place on the water surface. We believe that the fabricated MXene/PU motor has potential to fundamentally solve challenges in cargo transport and beyond, and the concept of remote motion-control of micro-objects by external stimulus can inspire further explorations of design of self-propelled motors and systems.
✓ 已验证
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2024
·Vol. 26
·期 38
·25232-25239
·
IF 2.9
Jielong Li,Rongbin Deng,Muci Li,Jingwei Wu,Bingyu Wang,Liming Liu,Zichuan Yi,Honghang Wang,Xiaowen Zhang
Light emission from carbon dots (CDs) is of great interest in both electroluminescence and photoluminescence. Herein, we construct electroluminescent and photoluminescent light-emitting diodes (LEDs) from emitters of CDs. The electroluminescent LED with host–guest-doped dual emissive layers (EMLs) of [poly(9-vinylcarbazole) (PVK)-CDs] × 2 gives satisfactory electro-optical properties, with maximum luminance of 560 cd m−2 at 16 V, luminous efficiency of 0.183 cd A−1, power efficiency of 0.082 lm W−1, and external quantum efficiency of 0.25%, which are superior to the counterparts with single-EML of CDs, single-EML of [PVK-CDs], and triple-EMLs of [PVK-CDs] × 3. These enhanced properties are rationally ascribed to optimization of the device architecture, carrier balance improvement, and reduction in concentration-induced quenching. The electroluminescent LEDs also show color evolution from PVK to CDs, and/or to the PVK/CDs interface, with increasing driving voltages, owing to incomplete energy transfer from PVK to CDs. Highly efficient photoluminescent LEDs with 365- and 395-nm UV excitation are demonstrated. With a CDs : polyvinyl pyrrolidone ratio of 1 : 3, the 365-nm excited photoluminescent LED gives a maximum luminance of 512 347 cd m−2 with a power efficiency of 25.2 lm W−1, while the 395-nm excited photoluminescent device gives a maximum luminance of 670 954 cd m−2 with a power efficiency of 22.0 lm W−1, with both showing yellow emission. Our experiments provide some new ideas for broadening CD applications and advancing LEDs.
✓ 已验证
DOI
高影响因子
Cell Reports Physical Science
·
2021
·
IF 0
Chenxi Dong,Xupeng Zong,Ziwen Liu,Lijuan Niu,Zhao Zhao,Li An,Dan Qu,Xiayan Wang,Zaicheng Sun
Molecular oxygen (O 2 ) activation is a critical step in the low-temperature catalytic oxidation of carbon monoxide (CO). Photocatalysis is a facile way to activate O 2 to superoxide radicals under mild conditions. Photothermal catalysis, which integrates the photocatalysis of semiconductors and the thermocatalysis of noble metals, has arisen as an appealing strategy to achieve low-temperature catalytic oxidation. Here, we report that Pd/PdO/CeO 2 shows that the temperature of 90% CO conversion dropped by 30°C–50°C under irradiation. The apparent activation energy reduces from 64.6 kJ ⋅ mol −1 to 44.6 kJ ⋅ mol −1 . Pd/PdO/TiO 2 and Pd/PdO/Al 2 O 3 are prepared and compared to understand the underlying mechanism. The results reveal that photocatalysis is vital in lowering the apparent activation energy besides the photothermal effect. The photo-generated electrons promote O 2 activation to generate the superoxide anion. The hole can activate the adsorbed CO on the PdO. These active species are beneficial for lowering the CO oxidation temperature.
✓ 已验证
DOI
PubMed
Cell Communication and Signaling
·
2024
·Vol. 22
·期 1
·1-13
·
IF 8.2
Zhao Changrui,Bo Jiaqiang,Li Tianyu,Tian Jiameng,Long Tian,He Yingying,Chen Siyu,Liu Chang
Background Papillary thyroid carcinoma (PTC) is the most common type of thyroid malignancy, with a rising incidence. Traditional treatments, such as thyroidectomy and radiotherapy, often lead to significant side effects, including impaired thyroid function. Therefore, there is an urgent need for non-invasive therapeutic approaches. This study aims to explore the potential of photobiomodulation therapy (PBMT), a non-invasive treatment using specific wavelengths of light, in the management of PTC. Methods We investigated the effects of blue light PBMT on PTC cells, focusing on the Retinal-OPSIN 3 (OPN3) complex’s role in mediating cellular responses. Blue light exposure was applied to PTC cells, and subsequent changes in cellular proliferation, cell cycle progression, and protein expression were analyzed. Statistical tests, including one-way ANOVA and t-tests, were used to evaluate the significance of the findings. Results Blue light exposure led to the dissociation of 11-cis-retinal from OPN3, resulting in the accumulation of all-trans retinal. This accumulation disrupted cellular proliferation pathways and induced G0/G1 cell cycle arrest in PTC cells. The Retinal-OPN3 complex was found to be a key mediator in these processes, demonstrating that thyroid cells can respond to specific light wavelengths and utilize their photoreceptive potential for therapeutic purposes. Conclusions Our findings suggest that PBMT, through the modulation of the Retinal-OPN3 complex, offers a promising non-invasive approach for treating PTC. This study highlights the therapeutic potential of light signal transduction in non-ocular tissues and opens new avenues for non-invasive cancer therapies.
✓ 已验证
DOI
高影响因子
Advanced Science
·
2020
·Vol. 7
·期 14
·2000439
·
IF 15.84
Jundong Shao,Changshun Ruan,Hanhan Xie,Paul K. Chu,Xue-Feng Yu
The photochemical activity of black phosphorus (BP) in near-infrared (NIR) light controlled in situ biomineralization is investigated. Owing to the excellent NIR absorption, irradiation with NIR light not only promotes degradation of BP into PO 4 3− , but also enhances the chemical activity to accelerate the reaction between PO 4 3− and Ca 2+ and promote in situ biomineralization. Mineralization of hydrogels is demonstrated by the preparation of BP incorporated hydrogel (BP@Hydrogel) which delivers greatly improved biomineralization performance under NIR illumination. The biomineralization process which can be controlled by modulating the light irradiation time and location has a high potential in controlling the mechanical properties and osteoinductive ability in tissue engineering. This study also provides insights into the degradation, photochemical activity, and new biological/biomedical applications of BP.
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
He Zhang,Yu Mei,Fang Zhu,Fenting Yu,Sridhar Komarneni,Jianfeng Ma
A C@Fe 3 O 4 material, Fe 3 O 4 coated with carbon, was prepared by a simple one-pot hydrothermal method . The C@Fe 3 O 4 material was investigated with persulfate (PS) and light to degrade tetracycline (TC) as a function of pH, aeration conditions and quenching. Experimental results suggest that TC was effectively degraded in the C@Fe 3 O 4 /PS/Vis system. In addition, due to the availability of different main active species in this catalytic system, TC degradation was possible under both strong acid and strong alkali pH conditions. The presence of dissolved oxygen can also generate oxygen-active species, such as superoxide radicals (O 2 • - ) and singlet oxygen ( 1 O 2 ), to decompose TC organic matter in solution. Simply put, C@Fe 3 O 4 /PS/Vis catalytic system removed pollutants by the formation of O 2 • - , 1 O 2 , hydroxyl radicals (•OH) and sulfate radicals (SO 4 • - ) species for degrading TC. In addition, the stability of the C@Fe 3 O 4 material was found to be outstanding.
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2022
·Vol. 10
·期 8
·2102201
·
IF 10.05
Jiexin Li,Zongtao Li,Jiayong Qiu,Jiasheng Li
Quantum dots (QDs) exhibit remarkable photoelectric performance. However, the conversion efficiency and thermal performance of QD converters so far is not satisfactory for high-power solid-state light (SSL) applications owing to the serious reabsorption loss of QDs and the poor thermal diffusion of polymer materials. Here, an efficient QD converter based on an anodic aluminum membrane (AAM), with high light enhancement and thermal diffusion, is introduced for high-power SSL applications. Nanoporous AAMs are utilized as templates for confining the QD deposition into the nanowire (NW) shape by incorporating inkjet printing and vacuum-deposition methods, forming vertical QD NW arrays. Compared with conventional converters, QD-AAM yields nearly twofold photoluminescence intensity. Three-dimensional finite-difference (FDTD) simulations attribute the fluorescence-enhancement mechanism to the enhancement of QD conversions and boosting of the waveguide effect in QD-AAM. Furthermore, QD-AAM exhibits excellent thermal diffusion performance under high-power excitation, owing to the inner heat conduction path in the AAM framework. This study provides a practical and efficient strategy to comprehensively enhance the optical and thermal performance of QD converters for high-power SSL applications.
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Qinzhe Li,Yewei Zhang,Xuan Huang,Dongliang Yang,Lixing Weng,Changjin Ou,Xuejiao Song,Xiaochen Dong
Drug-resistant bacterial infection is a serious threat to the survival and health of human. Clinically, the conventional therapy for subcutaneous infections generally involves the systemic administration of high dose of antibiotics and frequently causes detrimental side effects in normal tissues. To overcome this issue, an acidity-responsive near infrared (NIR) light-triggered injectable hydrogel was designed for non-antibiotic local treatment. Herein, poly(ethylene glycol) diacrylate (PEGDA) was used as hydrogel matrix, polyoxometalate (POM) as acidity-enhanced photothermal agent and 2,2′-azobis[2-(2-imidazolin-2-yl) propane] dihydro-chloride (AIPH) as thermo-responsive initiator. After the hydrogel precursor solution (AIPH/POM/PEGDA) was injected into the acidic infected tissue, the aggregated POM with strong photothermal property was restricted to the site of abscess. Upon excitation at 1060 nm laser, the heat generated from POM would trigger alkyl radical formation from AIPH and thereafter achieving NIR-triggered in situ gel. Consequently, the POM and AIPH were trapped in Gel(AIPH/POM) and exhibited long-term retention in the abscess for further repeated local photothermal/thermodynamic antibacterial therapy. In vitro antibacterial evaluation indicated that the system could effectively eradicate drug-resistant bacteria through destroying bacteria integrity and producing the noxious alkyl radical under NIR light illumination. Moreover, the bacterial burden of abscess was significantly relieved and more collagens were deposited after the administration of Gel(AIPH/POM) and repeated NIR light. Meanwhile, no apparent adverse effect was observed during the treatment. This work not only provides a light-triggered gelation for local photothermal/thermodynamic synergistic therapy, but also offers a novel strategy for the rational design of light-responsive intelligent antibacterial hydrogels.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）