DYES AND PIGMENTS
·
2024
·
IF 4.1
Zhiming Zhong,Tingxin Chen,Feng Peng,Pengfei Niu,Jin Xu,Lei Ying
Blue organic light-emitting diodes with non-doped emissive layer (EML) structures have been garnered increasing interest due to their convenience of manufacturing process. For this purpose, we designed and synthesized two novel anthracene derivatives, PO2PhAnTz and PO2PhAnBI. Both derivatives exhibited bright blue electroluminescence emission and a relatively low operating voltage with a simple bilayer device structure. The PO2PhAnBI with triphenyl-phosphine oxide moiety as host, anthracene core as dopant and benzimidazole as electron transport group, realized a balanced bipolar transport and attained a maximum external quantum efficiency of 5.74 %. The findings shed light on the molecule design role toward high-efficiency non-doped blue OLEDs.
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Nano-Micro Letters
·
2021
·Vol. 14
·期 1
·1-11
·
IF 16.419
Liu Shihao,Zang Chunxiu,Zhang Jiaming,Tian Shuang,Wu Yan,Shen Dong,Zhang Letian,Xie Wenfa,Lee Chun-Sing
Here, this work presents an air-stable ultrabright inverted organic light-emitting device (OLED) by using zinc ion-chelated polyethylenimine (PEI) as electron injection layer. The zinc chelation is demonstrated to increase the conductivity of the PEI by three orders of magnitude and passivate the polar amine groups. With these physicochemical properties, the inverted OLED shows a record-high external quantum efficiency of 10.0% at a high brightness of 45,610 cd m −2 and can deliver a maximum brightness of 121,865 cd m −2 . Besides, the inverted OLED is also demonstrated to possess an excellent air stability (humidity, 35%) with a half-brightness operating time of 541 h @ 1000 cd m −2 without any protection nor encapsulation.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Hao Huang,Xu-Sheng Wang,Davin Philo,Fumihiko Ichihara,Hui Song,Yunxiang Li,Dan Li,Teng Qiu,Shengyao Wang,Jinhua Ye
The fixation of atmospheric dinitrogen to ammonia is one of the most essential processes for sustaining life. Since the N N bond in dinitrogen is one of the strongest bonds in chemistry, it remains a grand challenge to develop efficient catalysts for fixation of N 2 under ambient conditions. Herein we report for the first time on visible-light-assisted photocatalytic nitrogen fixation by metal organic framework material at room temperature and pressure. The Ti 3+ species induced by electron transfer from ligand-to-metal charge transfer process provide active sites for N 2 reduction. Furthermore, visible-light-assisted photocatalytic N 2 fixation is achieved by ligands functionalization which extend the light harvesting of the MOF to visible region. The integration of Ti sites and amine-functionalized linkers in NH 2 -MIL-125 (Ti) shows the highest visible light photocatalysis efficiency at a rate of 12.3 μmol g −1 h −1 . This Ti MOF system therefore shows a potential as a new design of combining light-harvesting and catalytic components in a single solid platform for green NH 3 production.
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2015
·Vol. 33
·期 1
·107-113
·
IF 1.166
Zheng Lili,Zhang Weiping,Xiao Xinyan
Titanium dioxide/tungsten disulfide (TiO 2 /WS 2 ) composite photocatalysts were fabricated via a one-step hydrothermal synthesis process, using TiCl 4 as titanium source and bulk WS 2 as sensitizer. The morphology, structure, specific surface area and optical absorption properties of the composite photocatalysts were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRD), specific surface area analyzer and ultraviolet-visible diffuse reflection spectrum (UV-vis DRS), respectively. The photocatalytic activity of as-prepared photocatalysts was evaluated by the degradation of methyl orange (MO) under illumination of 500W Xenon lamp. The results indicated that TiO 2 /WS 2 composite photocatalysts possessed excellent photocatalytic activity, and ∼95% of the degradation rate for MO was reached when molar ratio of WS 2 to TiO 2 was 0.004 and the irradiation time was 60 min. Moreover, the carrier trapping experiment and fluorescence spectra showed that ·O
− 2
was the key component in the photocatalytic degradation process and O 2 was reduced to be ·O
− 2
by the electrons from the conduction band of TiO 2 and WS 2 for the degradation of MO.
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Materials Today Communications
·
2022
·
IF 3.662
Wei Qiang,Xiao Qu,Chuntao Chen,Lei Zhang,Dongping Sun
As a photocatalyst , titanium dioxide (TiO 2 ) suffers from the wide band gap and the quick carrier recombination process, thus leading to the inefficient use of solar energy and poor catalytic performance. Herein, in this work, TiO 2 /Ti 3 C 2 heterojunctions are designed to overcome these shortcomings via growing TiO 2 in situ on the titanium element of Ti 3 C 2 MXene . The TiO 2 /Ti 3 C 2 heterojunctions not only broaden the range of light absorption , but also hugely extend the lifetime of photogenerated carriers. Besides, the anatase TiO 2 with exposed (001) facets further enhances the catalytic properties. After optimizing the amount of TiO 2 /Ti 3 C 2 heterojunctions by controlling reaction time, 20 mg catalysts can degrade 97.6% of 30 mL tetracycline solution (15 mg/L) in 90 min under visible light . Even after five cycles, the degradation ability of TiO 2 /Ti 3 C 2 only changes from 97.6% to 94.3%. This paper offers another perspective on the synthesis of efficient and stable photocatalysts.
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Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 14
·8521-8526
·
IF 10.733
Yuang Zhang,Malik Muhammad Umair,Xin Jin,Rongwen Lu,Shufen Zhang,Bingtao Tang
Solar thermoelectric generation (STEG) is an environmentally-friendly, safe, and economical technique that can be used for sustainable solar energy utilization. Efficient and stable STEG depends on strong light absorption and stable temperature difference. Herein, we constructed a new intelligent light-driven thermoelectric conversion system with VO2, polystyrene/Fe2O3-graphene nanosheets (PS/Fe2O3-GNS), and a thermoelectric module. The system can realize light-thermal-electric conversion and obtain a stable current owing to the infrared light transmittance switch of the VO2 film, high visible-light absorbing ability of PS/Fe2O3-GNS, and thermoelectric effect of the thermoelectric module. Furthermore, the new system can operate normally under sunlight, indicating the prospect of practical application.
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Materials Today Communications
·
2024
·
IF 3.7
Ligang Ma,Yuqing Yang,Tianyu Zhu,Yihuan Ding,Chao Lin,Le Xu,Xiaoqian Ai
In this paper, hexagonal ZnIn 2 S 4 nanoflowers were grown in situ on tetragonal WO 3 ·H 2 O nanosheets, yielding a compact ZnIn 2 S 4 @WO 3 ·H 2 O (ZIS@WO) core-shell heterojunction. The formation of the ZIS@WO heterojunction was optimized by meticulously adjusting the quantity of WO 3 ·H 2 O nanosheets incorporated. The crystal structure and microstructure of ZIS@WO were comprehensively examined using XRD, TEM and EDS analyses. The photocatalytic properties of ZIS@WO heterojunctions were evaluated through the degradation of organic pollutants under visible light irradiation. The results demonstrated a marked enhancement in photocatalytic efficiency for the ZIS@WO heterojunction. Further investigation into the separation and transport of photogenerated carriers were performed using PL spectroscopy and photoelectrochemical measurement. Compared to the individual components of ZnIn 2 S 4 nanoflowers and WO 3 ·H 2 O nanosheets, the ZIS@WO heterojunction creates an internal electric field at the interface, along with a compact core-shell configuration. This internal electric field, in conjunction with the band structure of the heterojunction, effectively accelerates the separation of photogenerated electrons and holes. Additionally, a comprehensive analysis of the photocatalytic degradation mechanisms were presented, elucidating the intricate processes.
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Frontiers of Materials Science
·
2025
·Vol. 19
·期 1
·1-13
·
IF 2.3
Zhao Jingkun,Yao Shuaikang,Huang Yingjie,Gao Siyu,Zhai Shangru,An Qingda,Xiao Zuoyi,Zhang Feng
It is undoubtedly a challenge to design an efficient and recyclable photocatalyst for the degradation of tetracycline (TC). In this study, a MoS 2 @C composite catalyst was fabricated through the simple sulfurization of alginate-based spheres encapsulating ammonium molybdate by thiourea. The incorporation of porous carbon as a co-catalyst significantly augmented reactive active sites, endowing it with great specific surface area and effectively preventing the aggregation of MoS 2 nanoparticles. While offering abundant catalytic sites for the reaction, the structure with interconnected channels promoted the adsorption of the reactant. The MoS 2 @C composites showed excellent photocatalytic performance, achieving a photodegradation ratio of 87.01% for TC within 60 min, superior to that of pure MoS 2 . Additionally, the photocatalytic mechanism for the degradation of TC was also investigated through free radical trapping experiments in combination with the electron spin resonance technique.
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ACS Photonics
·
2024
·
IF 6.5
Shaoqun Li,Yikai Yun,Wenjie Wei,Jianfeng Du,Sijie Jiang,Yuanyuan Tian,Hongqiang Luo,Kai Huang,Cheng Li,Mengyu Chen,Rong Zhang
Perovskite light-emitting diodes (PeLEDs) have emerged as promising candidates for high-speed data-driven illumination sources in optical communication, but the mechanisms influencing the modulation speed of PeLEDs are rarely discussed. Although it has been reported to increase the modulation bandwidth by reducing the device area, this is often geometrically limited and reduces the luminous efficiency. Here, with the surface treatment of 3-trifluoromethyl-benzylammonium iodide (3-TFBzAI) in different solvents, we can create a passivation/insulating layer on perovskites to promote/decrease the efficiency and modulation speed of PeLEDs. Based on devices with different surface treatments, an equivalent circuit model to affect the modulation speed of a PeLED is constructed using impedance analysis. The optimal post-treatment with chlorobenzene/isopropanol (CB/IPA) mixed solvent not only facilitates the luminous efficiency through efficient recrystallization and surface passivation but also, more importantly, boosts the modulation speed through favored charge injection and reduced parasitic capacitance. In particular, this improvement is more pronounced in small-area devices; up to a 77.6% increment of 3 dB bandwidth is realized in below 0.25 mm2 near-infrared PeLEDs with the resulting average external quantum efficiency of 11.67% and a 3 dB bandwidth of 1.9 MHz when the modulation speed is not affected by the active size.
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Science China-Chemistry
·
2024
·
IF 10.4
Wu Ning,Dai Fangxu,Wang Kunpeng,Wang Yunhu,Wang Xinyi,Zhang Kai,Zhang Mingming,Liu Kang,Xu Jixiang,Wang Lei,Xing Jun
White light-emitting diodes (WLEDs) as energy-saving light sources are widely used to alleviate the rising electric consumption. Most commercial WLEDs are blue/yellow-mixed emitting devices, which have some disadvantages, such as physiological damages of rich blue light, complex device structure and color aging. It is essential to develop single-component WLEDs with quasi-solar spectrum to overcome these problems. Here we demonstrate a high-performance single-component WLED based on donor-acceptor integrated carbon nitride (DACN) material. The donor-acceptor simultaneously increases the photoluminescence efficiency and the carrier mobility of graphitic carbon nitride (g-CN), hence, the DACN-based WLED reaches a milestone in maximum luminance of 2,045 cd m −2 and maximum external quantum efficiency of 2.2%, which are one order of magnitude higher than pristine g-CN-based LED. Furthermore, the DACN-based WLED emits broadband white light with color coordinates of (0.34, 0.44) and a color temperature of 5,163 K. Our works open a way to boost optoelectronic properties of g-CN materials and show their promising application in single-component WLEDs.
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JOURNAL OF MATERIALS CHEMISTRY
·
2012
·Vol. 22
·期 11
·4861-4873
·
IF 5.968
Sisi Cui,Haiyan Chen,Hongyan Zhu,Junmei Tian,Xuemei Chi,Zhiyu Qian,Samuel Achilefu,Yueqing Gu
Upconversion nanoparticles (UCNPs) have attracted much attention as potential photosensitizer carriers for photodynamic therapy (PDT) in deep tissues. In this study, hydrophilic UCNPs were prepared by coating amphiphilic chitosan (N-succinyl-N′-octyl chitosan, SOC) on the surface of hydrophobic oleic acid-capped NaYF4 UCNPs (OA-UCNPs). Water-insoluble photosensitizer zinc(II) phthalocyanine (ZnPc) was loaded into the SOC-coated UCNPs (SOC-UCNPs) via hydrophobic interactions to form a novel drug delivery system for in vivo deep tissue PDT triggered by near-infrared (NIR) light. The ZnPc-loaded SOC-UCNPs exhibited good dispersibility, excellent optical properties and good photostability. Under NIR light irradiation, the measurement of singlet oxygen production indicated that ZnPc effectively generated singlet oxygen induced by the emission from the UCNPs. Cell viability assays showed the low cytotoxicity of the UCNPs after surface modification. In vitro and in vivo therapeutic investigation evidenced the prominent PDT effects of ZnPc-loaded SOC-UCNPs upon NIR light irradiation. Furthermore, NIR imaging of ICG derivative-loaded SOC-UCNPs after intra-tumoral injection indicated the high retention of SOC-UCNPs only in the tumor site. Histological examination confirmed the negligible toxicity of ZnPc-loaded SOC-UCNPs on other organs. All the results demonstrate the promising potential of using SOC-UCNPs as new photosensitizer carriers for PDT of cancer and other diseases in deep tissues.
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JOURNAL OF ORGANIC CHEMISTRY
·
2024
·
IF 3.3
Yan-Ling Liu,Xian-Chen He,Jie Gao,Ke-Rong Li,Kai Chen,Hao-Yue Xiang,Hua Yang
Herein, visible light-induced, nickel-catalyzed direct functionalization of the Hantzsch esters (HEs) with readily accessible alkyl bromides has been successfully achieved by taking advantage of HE as the reductant and substrate through an aromatization-dearomatization process. In this strategy, the single electron reduction of alkyl bromides by reactive Ni(I) species is essential for the success of this late-stage transformation. A wide range of 4-alkyl-1,4-dihydropyridines were rapidly assembled in moderate to good yields under mild conditions, rendering this photoinduced approach attractive for synthetic and medicinal chemistry.
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