ACS Nano
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2025
·
IF 16
Bo Xu,Shichen Yuan,Linqin Wang,Xiansheng Li,Zhuang Hu,Haibo Zeng
Room temperature (RT) synthesized mixed bromine and chlorine CsPbBrxCl3–x perovskite quantum dots (Pe-QDs) offer notable advantages for blue quantum dot light-emitting diodes (QLEDs), such as cost-effective processing and narrow luminescence peaks. However, the efficiency of blue QLEDs using these RT-synthesized QDs has been limited by inferior crystallinity and deep defect presence. In this study, we demonstrate a precise approach to constructing high-quality gradient core–shell (CS) structures of CsPbBrxCl3–x QD through anion exchange. Characterization shows that these CS-QDs exhibit a type-I band alignment with a high bromine concentration in the core and a high chlorine concentration in the shell. This unique configuration results in a larger exciton binding energy and reduced defect density, leading to enhanced exciton radiative recombination. Consequently, QLEDs using CS-QDs achieve an external quantum efficiency (EQE) of 16.28%, a maximum luminance of 8423.35 cd/m2, and improved operational stability, surpassing the 12.80% EQE of reference QLEDs made with homogeneous structured QDs (HS-QDs). These findings present a strategy for developing high-quality RT-synthesized blue CS-QDs, marking a significant advancement in the field of efficient pure-blue QLEDs.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
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IF 9.4
Liyun Ma,Zhi Li,Yuying Cai,Linjiao Yang,Yuchen Xie,Ming Jiang,Xu Yu,Li Xu
Titanium dioxide (TiO 2 ) is a kind of generally used photocatalyst with the assistance of UV light. To utilize the visible light and save the energy, herein, a titanium (Ti)-based nanocomposite, i.e. PPDs/C-hTiO 2 , was designed and prepared based on carbon (C)-doping and photosensitive polymer dots (PPDs) nano-hybridization. This design synergistically narrowed the band gap energy (E g ) and strengthened absorption of the visible light. As a result, PPDs/C-hTiO 2 exerted remarkably high catalytic ability under visible light, surpassing that of commercial TiO 2 (i.e. P25) under UV light. PPDs/C-hTiO 2 succeeded in assisting the degradation of sulindac with a degradation efficiency of 96.7%±1.25% within 10 min under visible light. The degradation process was driven by the generation of hydroxyl radical, superoxide radical and holes, and the total biotoxicity of degradation products was decreased compared to the parent compound. This study creatively combined the C-doping and PPDs nano-hybridization to construct a visible light Ti-based photocatalyst, proposing a potential technique for addressing current aquatic environmental issues.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2024
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IF 4.3
Lihua Shen,Jundan Tang,Meng Li,Chunxia Yu,Meng Zhang,Shan Wang,Yuangang Li,Zhifang Liu
Sulfur quantum dots (SQDs) have been reported as a potential candidate due to their low toxicity and high luminescent performance. Here, SQDs with red light fluorescence (FL) emission were synthesized by a one-step hydrothermal method using Na 2 CO 3 as an etching agent, using sublimed sulfur powder as a sulfur source, and using bovine serum albumin (BSA) as a stabilizer. The choice of etching agent (NaOH or Na 2 CO 3 ) realized the tuning of SQDs’ FL emission with blue and red light. The synthesized SQDs showed good FL stability and high FL efficiency, with a quantum yield of 1.03 % in an aqueous solution at 575 nm. In addition, stable and efficient electrochemiluminescence (ECL) emission was achieved by employing SQDs as ECL emitters with K 2 S 2 O 8 as the co-reactant. The resorcinol (RS) can enhance the ECL intensity of the SQDs-K 2 S 2 O 8 system, and the ECL intensity had a good linear relationship with the concentration of RS in a range from 2.5 nM to 25 nM with a detection limit of 0.61 nM. This work provides an emerging red-light luminescent SQDs, which would open up a way for the development of new types of luminophor in FL or ECL analysis. It also provides convenience for bio-labeling of live cells, in vivo imaging and provide new materials for photoelectric devices.
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Nature Communications
·
2025
·Vol. 16
·期 1
·1-10
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IF 15.7
Yu Jinxing,Huang Jie,Li Ronghua,Li Yanbo,Liu Gang,Xu Xiaoxiang
Photocatalytic overall water splitting is a promising approach for a sustainable hydrogen provision using solar energy. For sufficient solar energy utilization, this reaction ought to be operated based on visible-light-active semiconductors, which is very challenging. In this work, an F-expedited nitridation strategy is applied to modify the wide-bandgap semiconductor Sr 2 TiO 4 for visible-light-driven photocatalytic overall water splitting. Compared to the conventional nitridation approach, F-expedited nitridation introduces the desirable integration of a high concentration of N dopant for strong visible light absorption and a low concentration of defects (i.e. Ti 3+ and oxygen vacancies) for effective separation of photocarriers. After being coated with Ti-oxyhydroxide protection layer and deposited with RhCrO y cocatalyst, the product from F-expedited nitridation can stably run photocatalytic overall water splitting with apparent quantum efficiency of 0.39% at 420 ± 20 nm and solar-to-hydrogen efficiency of 0.028%. These findings justify the effectiveness of F-expedited nitridation strategy and serve as a guidance to upgrade the photocatalytic activity of many other wide-bandgap semiconductors.
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ChemCatChem
·
2024
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IF 3.8
Chengzhuo Yu,Jin Xu,Yarui Wang,Silong Wang,Li Xiong,Fanglan Geng,Zesen Shang,Huasheng Wu,Jitao Lv,Lixia Zhao,Yawei Wang
Graphical Untill now, reactive oxygen species (ROS) are difficult to generate in the natural light conditions, since most photocatalysts require external strong stimuli. We surprisingly found the ROS generation on MIL-100(Fe)/TiO 2 driven by mild natural light. The ROS generation patterns and mechanism of MIL-100(Fe)/TiO 2 was revealed by chemiluminescence (CL) and density functional theory (DFT). Reactive oxygen species (ROS), as one kind of the most highly oxidizing oxidants, are difficult to generate and utilize in the natural light conditions, since many materials require external strong stimuli for ROS release to be effective as pollutant degradation or biocide. In this work, we surprisingly found the ROS generation on MIL-100(Fe)/TiO 2 driven by mild natural light. Then ROS generation patterns and mechanism was revealed by chemiluminescence (CL) and density functional theory (DFT). Meanwhile, rhodamine B (RhB) can also be removed by MIL-100(Fe)/TiO 2 under natural light, which further evidence the ROS generation under the natural light. This work provides a new direction for spontaneously generating ROS releasing without external strong stimuli and has the broad potential applications in the field of pollutant degradation or antimicrobials under natural conditions.
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INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Mengyu Guan,Jun Liu,Linpeng Xie,Dan Liu,Zongyuan Xie,Lei Qiu,Yiwen Wu,Peipei Dang,Yunlong Xie,Wenxin Mao,Zhigao Dai,Guogang Li
Mixed-dimensional perovskite (MDP) heterostructures are promising optoelectronic semiconductors. Yet, the current preparation methods involve complex experimental procedures and material compatibility constraints, limiting their widespread applications. Here, we present a one-step room temperature solution-based approach to synthesize a range of 1D C4N2H14PbBr4 and 3D APbBr3 (A = Cs+, MA+, FA+) self-assembled MDP heterostructures exhibiting high-efficiency white light-emitting properties. The ultra-broadband emission results from the synergy between the self-captured blue broadband emission from 1D perovskites and the green emission of 3D perovskites, covering the entire visible-light spectrum with a full width at half-maximum exceeding 170 nm and a remarkable photoluminescence quantum yield of 26%. This work establishes a novel prototype for the preparation of highly luminescent MDP heterostructures, offering insights for future research and industrialization in the realm of white light LEDs.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Chong He,Yang Xiao,Sheng Wang,Huanjun Lu,Xiaohong Li,Lin Xu,Chao Wang,Yingfeng Tu
The stimulus-responsive polymeric materials have attracted great research interest, especially those remotely manipulated materials with potential applications in actuators and soft robotics. Here we report a photoresponsive main-chain actuator based on azobenzene poly(ether ester) multiblock copolymer (mBCP) thermoplastic elastomers, (PTAD-b-PTMO-b-PTAD)n, which were synthesized by a cascade polycondensation-coupling ring-opening polymerization method using poly(tetramethylene oxide) (PTMO) and azobenzene-containing cyclic oligoesters (COTADs) as monomers. The thermal, mechanical, and microphase separation behaviors of mBCPs could be flexibly tuned by altering the ratios of soft-to-hard segments and block number (n). The oriented azobenzene mBCP fibers were prepared by melt spinning, showing reversible photoresponsive properties with remarkably high strength (∼1000 MPa) and high elongation at break comparable to spider silks. Fast photoinduced bending and contraction were successfully achieved in these fibers with high work and power densities and energy conversion efficiency, enabling it to lift up about 250 times of its own weight. Moreover, it can take out materials inside the tube by UV-light control. These fibers could be applied in light-driven actuators or telecontrolled robot arms.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Nan Wang,Zhiwei Zhou,Chunjiao Liu,Yongwang Liu,Xing Li,Yanling Yang,Li Zhao
Algae-derived organic matter (AOM) limits the effectiveness of conventional water treatment processes, affects the normal operation of water treatment plants, and causes water quality deterioration. Efficient elimination of AOM is an urgent issue in the advanced treatment of drinking water. In this study, A heterogeneous interface for AOM removal was established based on BT/C, which can be driven by visible light. The removal efficiencies of extracellular organic matter (EOM), intracellular organic matter (IOM), and AOM by BT/C reached the optimal levels at 30 min, 60 min, and 90 min, respectively, reaching 48.5 %, 81.8 %, and 74.0 %. BT/C can oxidize and break down a large amount of high-molecular-weight organic matter in EOM into medium- and low-molecular-weight organic substances, and effectively remove the low-molecular-weight organic matter in EOM. In addition, BT/C can efficiently remove humic acids(HS) and aromatic protein organic matter in IOM, directly mineralize or decompose high-molecular-weight biopolymers into small-molecular-weight acidic and neutral organic matter; electron paramagnetic resonance spectroscopy and reactive oxygen species trapping experiments verified that hydroxyl radical (·OH) have play most important role on the degradation of various molecular weight organic matters. Superoxide radical (·O 2 – ) plays a dominant role in the oxidation process of soluble microbial metabolites and HS, and ·OH plays a significant role in the oxidation process of amino acid-like proteins. This study provides new ideas and technical support for the complete removal of algae-derived organic matter and the protection of drinking water safety.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
·
IF 7.7
Suchi Liu,Mingrui Zhang,Jie Liu,Yong Lei,Mǎdǎlina Georgiana Albu Kaya,Keyong Tang
In this study, CA-Gel complexes were prepared by crosslinking gelatin with chlorogenic acid (CA) by EDC/NHS chemistry, and incorporated into gelatin to produce CA-Gel/Gel films for leather artifact preservation. The synthesized CA-Gel complex had a total phenolic content of 139.62 ± 1.8 mg/g. The moisture content of CA-Gel/Gel film is 37.84 % lower than that of Gel film. The addition of CA-Gel complexes enhanced the hydrophobic and antibacterial properties of Gel films. CA-Gel/Gel films showed excellent antioxidant properties, as evidenced by the increase in the DPPH radical scavenging rate from 0 to 98.18 %. Additionally, CA-Gel/Gel films effectively shield UV light, preventing almost the transmission of ultraviolet rays. Notably, CA-Gel/Gel films maintain their antioxidant properties and UV light shielding after one month at ambient temperature. Therefore, their long-term antioxidant and UV light shielding properties were indicated. In addition, the UV light aging tests were carried out on leathers with and without CA-Gel/Gel film coverage. The results showed that CA-Gel/Gel films effectively preserved the original color of leathers, with no changes in their random coil structure before and after UV light irradiation. This work emphasizes the potential use of CA-Gel/Gel films as an innovative protective packaging solution for long-term preservation of leather artifacts.
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Advanced Optical Materials
·
2025
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IF 7.2
Si-Jie Li,Xiongkai Tang,Chiu Hwi Ng,Jia Yang Lim,Wai Kit Tang,Wen-Cheng Chen,Yanping Huo,Maggie Ng,Season Si Chen,Dongdong Zhang,Lian Duan,Man-Chung Tang
Improving operational stability for organic light-emitting diode (OLED) is a hotspot in scientific research. It is proposed that silicon (Si) and germanium (Ge) can exhibit hyperconjugation effects and participate in conjugated systems, thereby stabilizing molecules’ excited and polarized states. Herein, the importance of incorporating Si and Ge in multi-resonance thermally activated delayed fluorescence emitters is revealed to improve their luminescence efficiency and intrinsic stability. Computational studies show that introducing Si and Ge atoms can strengthen the C−Si and C−Ge bonds due to the hyperconjugation effect, resulting in higher bond dissociation energies and molecular photostability. With the efficient spin-vibronic coupling and spin-orbital coupling, the flexible conformations of the emitters facilitate the spin-flip processes by enriching the characters and density of their excited states. A maximum external quantum efficiency of 30.0% for BN -Ge -based blue-emitting OLEDs, with (Commission Internationale de l'Eclairage) CIE y ≤ 0.18 is realized. In particular, the LT 90 at 1000 cd m −2 of 48.3 and 7.1 h is achieved for BN-Si -based and BN-Ge -based OLEDs, respectively, using the developed deuterated SiCzCz-d 15 and SiTriCz2-d 16 as the hole-transporting and host materials. It is anticipated that the study will provide insights into the design of group IV element-containing multiple-resonance thermally activated delayed fluorescent emitters for optoelectronics applications.
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Small
·
2024
·Vol. 20
·期 49
·2403325
·
IF 13
Shuai-Hao Xu,Jin-Zhe Xu,Ying-Bo Tang,Wei-Zhi Liu,Shu-Guang Meng,Dong-Ying Zhou,Liang-Sheng Liao
The solution-derived non-stoichiometric nickel oxide (NiO x ) is a promising hole-injecting material for stable quantum dot light-emitting diodes (QLEDs). However, the carrier imbalance due to the misalignment of energy levels between the NiO x and polymeric hole-transporting layers (HTLs) curtails the device efficiency. In this study, the modification of the NiO x surface is investigated using either 3-cyanobenzoic acid (3-CN-BA) or 4-cyanobenzoic acid (4-CN-BA) in the QLED fabrication. Morphological and electrical analyses revealed that both 4-CN-BA and 3-CN-BA can enhance the work function of NiO x , reduce the oxygen vacancies on the NiO x surface, and facilitate a uniform morphology for subsequent HTL layers. Moreover, it is found that the binding configurations of dipole molecules as a function of the substitution position of the tail group significantly impact the work function of underlying layers. When integrated in QLEDs, the modification layers resulted in a significant improvement in the electroluminescent efficiency due to the enhancement of energy level alignment and charge balance within the devices. Specifically, QLEDs incorporating 4-CN-BA achieved a champion external quantum efficiency (EQE) of 20.34%, which is a 1.8X improvement in comparison with that of the devices utilizing unmodified NiO x (7.28%). Moreover, QLEDs with 4-CN-BA and 3-CN-BA modifications exhibited prolonged operational lifetimes, indicating potential for practical applications.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Yongmin Duan,Shugang Li,Keyi Gu,Zhaojing Kuang,Juan Du,Junjie Zhang
Red light emitting perovskite quantum dot (PQD) glass, with narrow-band emission and excellent stability, holds great potential for applications in liquid crystal displays. However, its low photoluminescence quantum yield (PLQY) remains the biggest obstacle limiting its practical application. Additionally, the mechanism behind the enhancement of the PLQY is not well understood, which restricts the further improvement of the PLQY in red light emitting PQD glass. In this work, AgI doped red light emitting CsPbBrI 2 PQDs glass exhibitated significantly improved PLQY. The underlying mechanisms shown that the formation of Ag nanoparticles (NPs) promotes a localized surface plasmon resonance (LSPR) effect, which increases the charge carrier density and optical activity. Density functional theory (DFT) calculations indicate a widening of the PQD bandgap upon AgI doping, which contributes to reduced non-radiative recombination and improved PLQY. Attractively, the optimal doping concentration of 0.4 mol% AgI resulted in a maximum PLQY of 62.4 %. Finally, the PG0.4 sample demonstrated excellent thermal, water, and photostability, maintaining over 88 % of its initial emission intensity under prolonged stress conditions. These results highlight the potential of AgI-doped red light emitting CsPbBrI 2 PQDs for use in high-performance optoelectronic devices, offering both enhanced luminescence and long-term stability.
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