Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 11
·3969-3977
·
IF 7.393
Quan Liu,Puxian Xiong,Xiaoqi Liu,Yubin Fu,Sheng Wu,Quan Dong,Yuanyuan Li,Yan Chen,Zhijun Ma,Mingying Peng
Red luminescent phosphor SrLaGa3O7:Mn4+ was prepared by the traditional high-temperature solid-state reaction. The structural characteristics, luminescence properties and the performance of this phosphor were investigated in light-emitting diode devices. Deep red emission peaking at ∼715 nm was observed under the excitation wavelength in the range of 220–550 nm, which is related to the charge transfer band of Mn4+–O2− and the 4A2g → 4T1g, 4A2g → 2T2g and 4A2g → 4T2g transitions of Mn4+. In particular, SrLaGa3(1−x) O7:3xMn4+ exhibits the strongest absorption in the near ultraviolet region (350–410 nm). This feature can well match the emission of current commercial near-ultraviolet chips, and is expected to be used in white LEDs. Moreover, we also conducted a thermal quenching experiment on the SrLaGa3O7:Mn4+ phosphor, and the obtained activation energy was 0.4 eV, indicating that the quenching temperature is (T50%) 370 K. Finally, the application of the SrLaGa3O7:Mn4+ phosphor in constructing a LED device was explored. At a driving current of 20 mA, the Commission on Illumination (CIE) coordinates of the device are (0.3281, 0.3080), with a high color rendering index (CRI) of 91.9 and a low corresponding color temperature (CCT) of 4315 K. Experimental results show that the phosphor has broad prospects in preparing white LED devices excited by near-ultraviolet light.
研究领域:
材料科学
·
光电子学
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固态化学
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光子学
·
发光二极管（LED）
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DOI
高影响因子
CATALYSIS LETTERS
·
2023
·Vol. 154
·期 6
·2527-2536
·
IF 2.8
Song Xiao-jie,Wang Xiu-fang,Wang Meng,Dong Wei-wei,Li Ming-ming,Yang Fan
The photocatalytic hydrogen (H 2 ) evolution process under solar-light irradiation is a crucial fundamental step for solar energy exploitation. In our study, the ZnS/reduced graphene oxide (ZnS/rGO) composites were prepared using a simple solvothermal approach. The combination of detailed theoretical simulation calculations and comprehensive characterizations indicates that the rGO can greatly increase the capture of light, reduce the band gap, accelerate the transfer of photogenerated electrons, and provide more photo-induced carriers to participate in photocatalytic reactions. The as-formed optimized ZnS/rGO composites exhibit a remarkably superior photocatalytic H 2 production capacity of 0.30 mmol/g/h, up to 4.29 times over bare ZnS nanoparticles. The enhanced photocatalytic H 2 evolution performance of the ZnS/rGO composites was ascribed to the intimated hetero-interface between components and the efficient transfer of photo-generated electrons from ZnS to rGO. This work provides new insights into the semiconductor-graphene heterojunction photocatalyst for enhancing photocatalytic activity. Graphical
研究领域:
材料科学
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纳米技术
·
能量转换
·
催化
·
可再生能源
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DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2018
·Vol. 47
·期 9
·5359-5369
·
IF 1.566
Yao ZiFeng,Zheng GanHong,Zhang ZhanJun,Dai ZhenXiang,Zhang LingYun,Ma YongQing
Mono-dispersed and uniform SrMoO 4 :0.1Eu nanoparticles have been synthesized using a thermal decomposition technique. The prepared SrMoO 4 :0.1Eu nanoparticles have narrower size distribution than the particles synthesized previously using other preparation techniques. In order to improve the photocatalytic performance of SrMoO 4 -based materials, the SrMoO 4 :0.1Eu nanoparticles were also diluted in an amorphous SiO 2 matrix with different concentrations of SrMoO 4 :0.1Eu nanoparticles. Although crystalline SiO 2 is an insulator and has no photocatalytic activity due to its intrinsic properties, the results suggested that the current SrMoO 4 :0.1Eu nanoparticles diluted in amorphous SiO 2 exhibited enhanced photocatalytic performance in the degradation process of methyl blue. Large absorption in the visible and ultraviolet light was observed by the UV–vis absorbance spectra. The smallest energy gap in these samples was found to be 2.0 eV. In particular, the photodegradation efficiency of methyl blue over SrMoO 4 -based samples was up to about 88% in 60 min when the quantitative ratio of SrMoO 4 :0.1Eu and SiO 2 was fixed to be 1:2, respectively. By synthesizing the undiluted and SiO 2 diluted SrMoO 4 :0.1Eu samples, this work provides an effective technique to improve the photocatalytic activity of SrMoO 4 -based materials, especially SrMoO 4 :0.1Eu nanoparticles.
研究领域:
材料科学
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纳米技术
·
环境化学
·
光催化
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无机合成
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DOI
高影响因子
ChemSystemsChem
·
2021
·Vol. 3
·期 5
·e2100006
·
IF 0
Yan Huang,Xiaoliang Wang,Junbo Li,Youping Lin,Haixu Chen,Xiaoman Liu,Xin Huang
Graphical Dynamic regulation of coacervate microdroplets as a protocell model has attracted more and more attention in recent years. However, the dynamic regulation of enzymatic reactions has not yet been achieved. A method to regulate enzymatic reactions rate by assembly-disassembly-reassembly of light-induced coacervates is proposed, which could pave the way to the further development of dynamic coacervate-based protocells. Membrane-free coacervate microdroplets are widely utilized as protocell or membrane-less organelle models in the study of cell physicochemical properties. Dynamic regulation of coacervate microdroplets is of great significance because of the close connection between the formation/dissociation of condensate in vivo and physiology and pathology. Here, we describe light-responsive coacervate microdroplets prepared from azobenzene cation trans-azobenzenetrimethylammonium bromide (trans-azoTAB) and anion succinylated amylose (Su-Amy), which are formed by hydrophobic interaction and electrostatic interaction. The rapid and accurate response of azoTAB to light makes the microdroplets disassemble and reassemble within seconds under UV and within minutes under blue light, which provides a method to regulate the enzymatic reaction rates by the light-induced assembly-disassembly-reassembly of the coacervate microdroplets. Our results show a new type of membrane-less protocell model that can realize flexible spatiotemporal control and demonstrate a method for dynamically regulating the rate of enzymatic reactions inside the microdroplets, which provides a feasible scheme for exploring the relationship between physiology and disease in vitro .
研究领域:
化学
·
生物材料科学
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细胞生物学
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生物物理学
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DOI
Advanced Electronic Materials
·
2022
·Vol. 8
·期 7
·2101402
·
IF 7.633
Rongxue Ji,Guangdi Feng,Chunli Jiang,Bobo Tian,Chunhua Luo,Hechun Lin,Xiaodong Tang,Hui Peng,Chun-Gang Duan
Optoelectronic synapses integrating synaptic and sensing functions have great potential in visual information processing and neuromorphic computing. Here, an artificial optoelectronic synapse based on copper-phthalocyanine (CuPc) and poly(vinylidene fluoridetrifluoroethylene) (P(VDF-TrFE)) is reported. The fabricated two-terminal device exhibits bidirectional responses to light pulses with different wavelengths, which endows the device the capability to implement both excitatory and inhibitory synaptic behaviors in an optical pathway. The introduction of P(VDF-TrFE) greatly improves the performance of the device as an artificial synapse, because the ferroelectric polarization of P(VDF-TrFE) can control the relaxation behavior of the device. After mimicking some basic functions of biological synapses, the device is successfully applied to simulate the action and relaxation process of nociceptors when suffering from external harmful stimuli.
研究领域:
生物医学工程
·
材料科学
·
神经科学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Junjie Wang,Danyang Li,Lan Mu,Miaozi Li,Yu Luo,Binbin Zhang,Chaohuang Mai,Biao Guo,Linfeng Lan,Jian Wang,Hin-Lap Yip,Junbiao Peng
Full-color matrix devices based on perovskite light-emitting diodes (PeLEDs) formed via inkjet printing are increasingly attractive due to their tunable emission, high color purity, and low cost. A key challenge for realizing PeLED matrix devices is achieving high-quality perovskite films with a favorable emission structure via inkjet printing techniques. In this work, a narrow phase distribution, high-quality quasi-two-dimensional (quasi-2D) perovskite film without a “coffee ring” was obtained via the introduction of a phenylbutylammonium cation into the perovskite and the use of a vacuum-assisted quick-drying process. Relatively efficient emissions of red, green, and blue (RGB) uniform quasi-2D perovskite films with high photoluminescence quantum yields were cast by the inkjet printing technique. The RGB monochrome perovskite matrix devices with 120 pixel-per-inch resolution exhibited electroluminescence, with maximum external quantum efficiencies of 3.5, 3.4, and 1.0% (for red, green, and blue light emissions, respectively). Furthermore, a full-color perovskite matrix device with a color gamut of 102% (NTSC 1931) was realized. To the best of our knowledge, this is the first report of a full-color perovskite matrix device formed by inkjet printing.
研究领域:
材料科学
·
光电技术
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DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2022
·
IF 3.656
Yiyang Bi,Guangqi Wang,Jiabo Wang,Qun Liu,Yu Zhang
Intrinsic charge carrier recombination, narrow visible light absorption and poor durability restrain the photoactivity for solar-to-H 2 production. Here, noble-metal-free binary co-catalyst Ni 2 P–Ni 2 P 4 O 12 was synthesized by a simple one-step thermal phosphorylation method for enhancing CdS nanowires in visible-light-driven hydrogen generation, where the CdS nanowires are uniformly dispersed on the surface of Ni 2 P–Ni 2 P 4 O 12 through in-situ solvothermal strategy. The photocatalytic hydrogen production rate of 5 wt% Ni 2 P–Ni 2 P 4 O 12 /CdS nanowires can reach 5093 μmol g −1 h −1 using Na 2 S–Na 2 SO 3 as sacrificial agent under the irradiation of visible light (λ > 420 nm), which is about 16 times for CdS nanowires (316 μmol g −1 h −1 ). In the cycling experiments, the composite catalyst shows good stability and the hydrogen production rate remains about 83% of the initial value. The interface structure construction between CdS nanowires and Ni 2 P–Ni 2 P 4 O 12 result in the excellent photocatalytic activity , broaded visible light absorption and stability. Specifically, Ni 2 P–Ni 2 P 4 O 12 can effectively promote the separation of electron hole pairs in space, in which Ni 2 P 4 O 12 can accept H + ions and Ni 2 P can reduce the over potential of H + reduction, resulting in the synergically promotion in the photocatalytic activity. The cost-effective ternary photocatalyst exhibits great potential for sustainable and high-efficiency photocatalytic water splitting, and Ni 2 P–Ni 2 P 4 O 12 may be suitable to modify a wider variety of semiconductor photocatalysts.
研究领域:
材料科学
·
能源化学
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DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2020
·
IF 1.943
Xiangjia Meng,Shuai Huang,Mengmeng Shang
Red-emitting phosphors have attracted considerable interest for their applications in warm white light-emitting diodes (LEDs). A series of novel red emitting Eu 3+ -doped Ba 2 GdVO 6 phosphors were prepared by a solid-state reaction annealed at 1300 °C for 6 h. Under the excitation of blue light (465 nm), Ba 2 GdVO 6 :Eu 3+ phosphors emit pure red light. The critical distance at which concentration occurs is determined to be 8.7 Å when the doping concentration reached up to 20 mol%. More importantly, the as-prepared Ba 2 GdVO 6 :20%Eu 3+ phosphor exhibit good thermal stability. The PL intensity at 150 °C remains 72% of its initial intensity at room temperature. The preliminary studies show that the Ba 2 GdVO 6 :Eu 3+ might be a promising red material for application in blue light converted warm white LED.
研究领域:
材料科学
·
光学工程
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DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 10
·4082
·
IF 4.6
Jinbo Yang,Xiangxue Cao,Lanfeng Wei,Jianshu Zhang,Jinli Zhang,Ping Liu,Liang Xu,Pengfei Li
Herein, a four-coordinated organoboron compound, aminoquinoline diarylboron (AQDAB), is utilized as the photocatalyst in the oxidation of silane to silanol. This strategy effectively oxidizes Si–H bonds, affording Si–O bonds. Generally, the corresponding silanols can be obtained in moderate to good yields at room temperature under oxygen atmospheres, representing a green protocol to complement the existing preparation methods for silanols.Keywords:photocatalytic oxidation;silane;silanol;aminoquinoline diarylboron
研究领域:
有机化学
·
光化学
·
催化
·
绿色化学
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DOI
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Sheng Wu,Puxian Xiong,Dongliang Jiang,Quan Liu,Ke Zhang,Binli Xiao,Yan Chen,Yinzhen Wang
An activator’s selective occupation of a host is of great significance for designing high-quality white light-emitting diode phosphors, while achieving a full-spectrum single-phase white light emission phosphor is challenging. In this study, a boron phosphate solid-solution Na2Y2(BO3)2–x(PO4)xO:0.005 Bi3+ (NYB2–xPxO:0.005 Bi3+) white phosphor was designed by selectively occupying Bi3+ activators in the mixed anionic groups. The substitutes of the anionic unit (BO3)3– by the (PO4)3– unit are supposed to force part of the Bi3+ ion to enter the Na lattice site, which produces an intense orange-red emission peaked at 590 nm. In parallel, spectral tuning from blue to white light and an internal quantum efficiency of 56.42% was obtained, and the thermal stabile luminescence intensity remains at 94.2% of the initial intensity after four heating–cooling cycles from 30 to 210 °C (luminescent intensity is 83.6% of room temperature (RT) at 150 °C, with excellent thermal stability and recovery performance). Finally, an excellent color rendering index (Ra = 90.8 and R9 = 85) was demonstrated for white light-emitting diode devices using only an NYB1.5P0.5O:0.005 Bi3+ phosphor and a near-ultraviolet (n-UV) 365 nm LED chip. This work delves into the different selective occupancy of Bi3+ ions and explores a new avenue for the design of phosphors for full-spectrum white light emission.
研究领域:
材料科学
·
光电技术
·
光子学
·
固态照明
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DOI
高影响因子
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Xuyong Tao,Boyan Liu,Guoqing Tong,Hanwen Zhu,Junchun Li,Yuanyuan Sheng,Chengyun Wu,Yajing Chang,Yangqing Wu,Yang Jiang
Ligand exchange has been demonstrated as an efficient strategy to improve the photoluminescence quantum yield (PLQY) and stability of quantum dots (QDs). Long-term illumination can considerably accelerate the ligand desorption after ligand exchange because of the weak bonding between the ligand and QDs. Here, a novel light-driven luminescence evolution strategy in combination with ligand exchange is devised by using N-acetyl-l-cysteine (NAC) as a ligand. NAC is expected to coordinate with the uncoordinated Pb2+ to improve the bonding between NAC and QDs. Light illumination is employed to accelerate the digestive ripening process and realize the uniform distribution of QDs. On the basis of the synergistic effect of NAC ligand exchange and light illumination, the CsPbBr3 QDs show reduced surface defects with nearly 100% PLQY and remarkable stability in polar solvents. Furthermore, a white light-emitting diode is demonstrated with a high rendering index of 80.7 and color temperature of 5595 K.
研究领域:
材料科学
·
光电技术
·
纳米技术
✓ 已验证
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 4
·2437-2445
·
IF 3.361
Heng Xu,Jianghu Liang,Zhanfei Zhang,Zihao Deng,Yuankun Qiu,Maosheng He,Jianli Wang,Yajuan Yang,Chun-Chao Chen
Cesium lead halide perovskite nanocrystals (NCs) have attracted extensive attention for photoelectric device application due to their excellent optoelectronic properties. However, the toxicity of lead has hindered their commercialization. Consequently, lead free cesium metal halide NCs have been developed, but these materials suffer from low photoluminescence quantum yield (PLQY) and poor stability. Here, a new class of lead-free non-perovskite blue-emitting cesium bromine (CsBr) and cesium iodine (CsI) halide NCs are realized by zinc doping. High PLQYs of 79.05% and 78.95% are achieved by CsBr:Zn and CsI:Zn NCs, respectively, attributed to the improved local structural order and reduced strain between the lattices of the NCs after storing under ambient conditions for 20 to 30 days. Moreover, zinc doped cesium halide NCs show excellent air stability for at least 50 days. Our results for zinc doped cesium halide NCs have shown a new avenue to fabricate lead-free halide NCs for blue lighting and display applications.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
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