Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 46
·14717-14724
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IF 6.641
Jiaming Wu,Shuxian Wang,Shuxin Liu,Shuwei Ma,Guojian Jing,Yueling Hu,Meng Wang,Zhengmao Ye,Xin Cheng
Recently, carbon dots (CDs) have received much attention in light-emitting applications owing to their low cost, non-toxicity and favorable fluorescence. In view of the aggregation-induced quenching effect and poor thermal stability of CDs, the development of a simple and high-efficiency strategy for solving these tough issues and improving the practicality of CDs is urgently necessary. Herein, a CD doped boehmite composite (CDs@AlOOH) is directly achieved through a facile one-step decomposition route. The uniform dispersion of CDs in AlOOH effectively alleviates the adverse self-quenching effect of CDs and gives rise to a tunable fluorescence feature of the composite. The N doping and energy transfer between CDs and AlOOH are beneficial for the photoluminescence (PL) enhancement of CDs@AlOOH. Meanwhile, CDs@AlOOH has outstanding long-term thermal stability, and maintains 98%, 90% and 80% of the initial PL performance after air heating treatment at 150 °C for 100 h, 250 h and 500 h, respectively. Moreover, the white lighting application is also demonstrated by combining CDs@AlOOH samples and commercial UV/blue light-emitting diodes (LEDs) without other phosphors. What is discussed in this study might offer some inspiration for dealing with the bottleneck problems of CDs in practical lighting and display fields.
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MATERIALS LETTERS
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2012
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IF 2.307
Shiguo Chen,Yujuan Guo,Shaojun Chen,Zaochuan Ge,Haipeng Yang,Jiaoning Tang
Incorporation of nanoparticles is becoming a new strategy for improving antibacterial activity . In this paper, Copper (Cu)/titanium dioxide (TiO 2 ) (CTD) nanocomposite was easily prepared by photocatalytic reduction, and its structure as well as antibacterial activity in the absence of light was investigated in detail. The results show that the CTD nanocomposite exhibits good antibacterial activity even in the absence of light. The minimal inhibition concentration against Escherichia coli and Staphylococcus aureus is 21.4 μg/mL and 14.3 μg/mL, respectively, which are much lower than that of pure silver, Cu and TiO 2 nanoparticles . In addition, the enhanced antibacterial effect of the CTD nanocomposite may be explained by synergistic antibacterial effect.
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JOURNAL OF LUMINESCENCE
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2024
·
IF 3.3
Wanyin Ge,Maohao Yang,Honglei Yin,Shifan Shang,Zili Luo,Xin Xie,Ye Tian
SiAlON-based phosphors have garnered considerable attention in the field of white lighting owing to their excellent thermal stability, and rare earth doped SiAlON-based phosphors are expected to be used in a new generation of lighting sources. In this work, Eu 2+ or Ce 3+ doped Si 3 Al 3 O 3 N 5 phosphors were synthesized by high temperature solid phase method. The microstructure of the phosphors exhibited irregular grain. The two phosphors exhibit green and cyan luminescence under 365 nm excitation, which are derived from the 5 d -4 f transitions of Eu 2+ and Ce 3+ , respectively. The quenching concentrations are 3 % and 4 % for Eu 2+ and Ce 3+ doped phosphors , respectively. The fluorescence intensity of Eu 2+ and Ce 3+ activated SiAlON powders decreased to 50 % of the room temperature intensity at 179 °C and 170 °C, respectively. The thermal activation energy values of the two phosphors were 0.35 eV, and the coordinate configuration diagram was constructed to comprehensively analyze the thermal quenching behavior of phosphors. Finally, the two phosphors powders were mixed with red and blue fluorophore to obtain white LEDs, showing low color temperature, high color rendering, high power unsaturation and long half-life. The SiAlON-based phosphors with excellent thermal stability obtained in this work achieve different wavelengths of luminescence in the green region. The results show that the β -Si 3 Al 3 O 3 N 5 phosphor can be used as a candidate material for high-quality green light supplement for wLEDs .
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CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Yandong Ren,Jianbo Hua,Zhongxu Han,Mengsi Sun,Shuchen Lü
Halide Perovskite light emitting diodes (LEDs) have attracted enormous attention due to their remarkable optoelectronic properties, facile bandgap tunability and low-cost. Here, we successfully synthesized the centimeter-sized pure non-emissive Cs 4 PbBr 6 , hybrid green-emitting Cs 4 PbBr 6 @CsPbBr 3 (H-Cs 4 PbBr 6 ) and ligand-induced H-Cs 4 PbBr 6 single crystals (SCs) via the precision-temperature-gradient crystallization method. The detailed formation process of H-Cs 4 PbBr 6 was detected by a real-time optical photograph and ultraviolet lamp during different growth stages ranged from colorless transparent to bright green. Notably, the H-Cs 4 PbBr 6 SC shows the behavior of excellent luminous properties (PLQY = 92 %) owing to the higher exciton binding energy, which is estimated to be ∼439.8 meV. The unusual intense green photoluminescence mechanism is evidenced by the various measurements, which can be attributed to the embedded CsPbBr 3 nanocrystals. Interestingly, the excellent long-term stabilities of as-prepared H-Cs 4 PbBr 6 SC against heat, and environment oxygen/moisture degradation are reported, which maintains high fluorescence brightness for 3 years in air, and then for more than 4 days under 80 °C and 80 % relative humidity without additional encapsulation. A larger activation energy of 461.1 meV exhibits the better thermal stability. Furthermore, an adjustment of the PL emission of H-Cs 4 PbBr 6 SCs is first achieved with the addition of ligands. Ultrapure green LED fabricated with the whole large Cs 4 PbBr 6 SC exhibits wonderful performance with luminous efficiency of 20.50 lm·W −1 , excellent color purity of ∼90.7 % and external quantum efficiency of 5.43 %, which demonstrate the immense potential and great prospect of H-Cs 4 PbBr 6 perovskite composites to replace conventional phosphors in lighting devices.
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Journal of Water Process Engineering
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2024
·
IF 6.3
Jinghua Liu,Runqiang Yu,Yuanfeng Zhu,Nianwei Yang,Yunqing Liu,Jiangwei Shang
The use of tetracyclines (TCs) in aquaculture has attracted significant attention due to its environmental impact. This study synthesized a visible light-responsive ZnO/CuO (ZC) composite photocatalyst via co-precipitation to degrade TCs in mariculture wastewater. The effects of CuO doping ratio, catalyst dosage, and TC concentration on TC degradation were systematically examined under visible light. Additionally, the reaction parameters for TC degradation were optimized using response surface modeling. The ZC 0.3 composite showed an exceptional TC removal efficiency of 90.89 % within 60 min for an initial TC concentration of 8.36 mg/L, which is 4.99 times higher than that of pristine ZnO. The enhanced photocatalytic activity of ZC is due to CuO doping, which adjusts the band structure that extends the absorption spectrum (2.78 eV) and improves visible light utilization (900 nm). Moreover, ZnO acts as an electron donor, significantly accelerating the separation of photogenerated electron-hole pairs. In the ZC catalytic system, holes, superoxide radicals (·O 2 − ), and hydroxyl radicals (·OH) are the primary reactive species. The strong oxidative potential of these species results in the mineralization of TC into less toxic or non-toxic small molecules. The loading of ZC powder catalysts onto polypropylene multifaceted spheres significantly enhanced the reuse efficiency of the catalysts. This research offers an effective strategy for managing TC pollution in mariculture and provides scientific guidance for using photocatalysts in saline environments.
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Advanced Science
·
2022
·Vol. 9
·期 12
·2102220
·
IF 17.521
Chenle Dong,Chen Yang,Muhammad Rizwan Younis,Jing Zhang,Gang He,Xingdi Qiu,Lian-Hua Fu,Dong-Yang Zhang,Hao Wang,Wenli Hong,Jing Lin,Xueqing Wu,Peng Huang
Intrauterine adhesions (IUAs) caused by mechanical damage or infection increase the risk of infertility in women. Although numerous physical barriers such as balloon or hydrogel are developed for the prevention of IUAs, the therapeutic efficacy is barely satisfactory due to limited endometrial healing, which may lead to recurrence. Herein, a second near-infrared (NIR-II) light-responsive shape memory composite based on the combination of cuprorivaite (CaCuSi 4 O 10 ) nanosheets (CUP NSs) as photothermal conversion agents and polymer poly( d , l -lactide- co -trimethylene carbonate) (PT) as shape memory building blocks is developed. The as-prepared CUP/PT composite possesses excellent shape memory performance under NIR-II light, and the improved operational feasibility as an antiadhesion barrier for the treatment of IUAs. Moreover, the released ions (Cu, Si) can stimulate the endometrial regeneration due to the angiogenic bioactivity. This study provides a new strategy to prevent IUA and restore the injured endometrium relied on shape memory composite with enhanced tissues reconstruction ability.
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ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Xueqian Li,Junying Li,Xiaoying Shen,Mengyao Cao,Yu Wang,Wansong Zhang,Yanglei Xu,Zhe Ling,Sheng Chen,Feng Xu
Light-management films that can control solar transmission through themselves, especially those based on renewable and biodegradable materials, are significant for diverse photon-related applications such as energy-efficient buildings, photovoltaics, and optoelectronic devices. Herein, composite transparent films with adjustable haze and UV-blocking capabilities are developed based on the main components of lignocellulosic biomass (cellulose and lignin), and their promising applications in light management are also demonstrated. Carboxymethyl cellulose (CMC) with a good film-forming property is used as the substrate matrix, and cellulose nanocrystals (CNC) with a nanoscale rod-like shape are used as functional fillers. The obtained CMC–CNC composite films exhibit adjustable optical properties (high transparency of >90% and haze of 3.17–13%) and surprisingly enhanced mechanical strength and thermal stability when compared with pure CMC films. Furthermore, lignosulfonates (LS), as industrial lignin products, are combined to endow the CMC–CNC–LS composite films with excellent UV-shielding performance (98.17% UVB and 89.38% UVA), but they well maintain the high transparency and haze. We demonstrate that the composite films are able to avoid color changes of UV test cards by shielding UV light and that they achieve uniform illumination when light transmits through, indicating their promising potential for practical applications in light management. In addition, the effect of CNC and LS contents on the morphological, chemical, mechanical, and thermal properties of composite films is investigated. Our work provides novel insights into the fabrication of sustainable light-management films based on lignocellulose-derived materials by tuning their light-scattering and light-absorbing properties.
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JOURNAL OF MOLECULAR STRUCTURE
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2025
·
IF 4.7
Ling Liang,Kai-Yue Liu,Guang Yang,Zeng-Min Xue,Wen-Xuan Zhao,Hong-Tao Lin,Shu-Hai Chen,Chuan-Zeng Wang,Mark R.J. Elsegood,Simon J. Teat,Ming Wang,Takehiko Yamato
The application of organic luminescent materials is becoming diversified in the fields of display technology, imaging, chemosensors and information encryption, but improving luminescent efficiency and color purity remains a challenge. Herein, new insight for fine tuning asymmetrical pyrene-based luminogens is discussed by constructing Donor-π-Acceptor (D-π-A) type molecules along the short axis at the pyrene core. Further experiments and calculations demonstrate the possibility of dual emission with near-white color emitting and narrow full-width half maximum (FWHM) materials (∼12 nm for 7- tert -butyl-1-phenyl-3-carbazolylpyrene ( CzPy) in film) by regulating electron-donating/withdrawing groups. Experimental results prove that the luminescent efficiency shows strong competitiveness in the solid state (14.3% for CzPy ) and in the pyrene luminogen-doped amorphous polymer (29.5% for 7- tert -butyl-1-phenyl-3- N,N -diphenylaminopyrene ( DPaPy )). The narrow FWHM dedicated to improving color purity and reasonable luminescent efficiency were achieved. Furthermore, these findings not only enabled development of a new application of latent fingerprint extraction with high resolution but also provided an innovative strategy for the fabrication of flexible light source displays.
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RSC Advances
·
2025
·Vol. 15
·期 13
·10144-10149
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IF 4.6
Lang Yang,Jialei Ying,Zhenzhong Liu,Guangyu He,Linli Xu,Mingyue Liu,Xinlei Xu,Guihua Chen,Meili Guan
Although TiO2 has been widely applied in many fields, the design and preparation of one-dimensional rutile TiO2 nanomaterials for high-efficiency photocatalysis under visible light remain challenging. Herein, uniform Co-doped rutile TiO2 nanorods with selective adsorption and photocatalytic activity for methylene blue (MB) have been developed via a one-pot molten salt flux method. Compared to pure rutile TiO2 nanorods, the Co-doped rutile TiO2 nanorods exhibited an obvious core/shell structure with smaller inner crystal face spacing (d001 = 0.20 nm) and a larger rough surface (the BET specific surface area is 25 m2 g−1). Furthermore, different dyes were employed to investigate the adsorption ability of Co-doped rutile TiO2 nanorods. The density functional theory (DFT) calculations determined that both the electrostatic potential and molecular structure could influence the adsorption behavior on the photocatalyst surface. The results indicated that the Co-doped TiO2 nanorods possessed a high selective adsorption capacity for MB (134.54 mg g−1 in neutral solution). The degradation of MB using Co-doped rutile TiO2 nanorods was conducted under visible light irradiation, yielding with an apparent rate constant of 0.301 min−1 at pH = 7. The degradation mechanism was further explored through electron spin resonance (ESR) experiments, which identified the formation of superoxide anions (·O2−) and hydroxyl radicals (·OH) in the system. This study provides a new strategy for preparing novel rutile TiO2 photocatalysts for the degradation of organic dyes under visible light.
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Nanoscale
·
2025
·
IF 5.1
Peiyuan Pang,Zhipeng Zhang,Bingzhe Wang,Tao Sheng,Guichuan Xing
Despite remarkable progress in sky-blue perovskite light-emitting diodes (PeLEDs), achieving efficient and color stable pure-blue electroluminescence remains challenging due to halide phase segregation, low-dimensional phase-induced non-radiative recombination, and defect-related losses in mixed Cl-Br quasi-2D perovskites. Here, we propose a dual-additive strategy to regulate phase distribution and manage Cl incorporation in quasi-2D perovskites for pure-blue PeLEDs. By introducing EDACl2 to suppress high-n phases and incorporate Cl for bandgap broadening, combined with NaBr to eliminate low-n non-radiative centers and promote small-sized nanocrystals, we optimize radiative recombination toward wide-bandgap phase distribution. This approach enables spectrally stable pure-blue electroluminescence at 474 nm without compromising photoluminescence quantum yield. Further hole-transport-layer engineering yields a peak external quantum efficiency of 4.6%, with spectral stability maintained under extreme bias up to 10.4 V. Our work provides critical insights into phase and halide management for high-performance blue PeLEDs, advancing their potential in full-color displays and lighting technologies.
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Nature Communications
·
2022
·Vol. 13
·期 1
·1-12
·
IF 17.694
Liu Yongjie,Tao Chen,Cao Yu,Chen Liangyan,Wang Shuxin,Li Pei,Wang Cheng,Liu Chenwei,Ye Feihong,Hu Shengyong,Xiao Meng,Gao Zheng,Gui Pengbing,Yao Fang,Dong Kailian,Li Jiashuai,Hu Xuzhi,Cong Hengjiang,Jia Shuangfeng,Wang Ti,Wang Jianbo,Li Gang,Huang Wei,Ke Weijun,Wang Jianpu,Fang Guojia
Formamidinium lead iodide (FAPbI 3 ) perovskites are promising emitters for near-infrared light-emitting diodes. However, their performance is still limited by defect-assisted nonradiative recombination and band offset-induced carrier aggregation at the interface. Herein, we introduce a couple of cadmium salts with acetate or halide anion into the FAPbI 3 perovskite precursors to synergistically passivate the material defects and optimize the device band structure. Particularly, the perovskite analogs, containing zero-dimensional formamidinium cadmium iodide, one-dimensional δ-FAPbI 3 , two-dimensional FA 2 FA n-1 Pb n I 3n+1 , and three-dimensional α-FAPbI 3 , can be obtained in one pot and play a pivotal and positive role in energy transfer in the formamidinium iodide-rich lead-based perovskite films. As a result, the near-infrared FAPbI 3 -based devices deliver a maximum external quantum efficiency of 24.1% together with substantially improved operational stability. Combining our findings on defect passivation and energy transfer, we also achieve near-infrared light communication with device twins of light emitting and unprecedented self-driven detection.
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JOURNAL OF LUMINESCENCE
·
2025
·
IF 3.6
Changsheng Liang,Zhiwei Yao,Wenyuan Zhou,Ming Deng,Jingcheng Xu,Ting Zhang,Mi Ouyang,Tao Sun,Guohua Jia,Chaoyu Xiang
Perovskite quantum dots (QDs) are considered ideal materials for the next generation of light-emitting diodes (LEDs) due to their high color purity and tunable emission. The surface characteristics of QDs, especially the small-sized pure red QDs, significantly impact their optoelectronic performance, with surface defects remaining a major obstacle to achieving high-performance LEDs. Among the QDs synthesized by thermal injection, there are some QDs with poor ligand coverage and low crystallinity, and it is difficult for traditional post-treatment methods to effectively passivate these QDs. Here, we propose a new post-processing strategy using a mixed solution of isopropanol and methyl acetate to dissolve NH 4 I to selectively screen small-sized QDs. This post-processing strategy can remove the low crystallinity QDs with poor ligand coverage and effectively passivate the remaining QDs in a halogen-rich environment. As a result of screening out lower-quality QDs, the overall performance of the QDs has been optimized, with the PLQY increasing from 79 % to 95 % and the lifetime improving from 12.7 ns to 13.7 ns. The EQE of devices based on the optimized QDs is 27.15 %, higher than the 19.46 % of the control devices.
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