LUMINESCENCE
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2023
·Vol. 38
·期 9
·1562-1571
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IF 2.9
Fadong Li,Yaosen Ye,Ruirui Cui,Jun Zhang,Cong Xu,Hui Xu,Gangyi Zhang,Chaoyong Deng
A series of Mn 4+ -doped and Mn 4+ ,K + -co-doped Ba 2 LaTaO 6 (BLT) double-perovskite phosphors was synthesized using a high-temperature solid-state reaction. The phase purity and luminescence properties were also studied. The optimum doping concentration of Mn 4+ and K + was obtained by investigating the photoluminescence excitation spectra and photoluminescence emission spectra. The comparison of BLT:Mn 4+ phosphors with and without K + ions shows that the photoluminescence intensity of K + -doped phosphors was greatly enhanced. This is because there was a charge difference when Mn 4+ ions were doped with Ta 5+ ions in BLT. Mn 4+ –K + ion pairs were formed after doping K + ions, which hinders the nonradiative energy transfer between Mn 4+ ions. Therefore, the luminescence intensity, quantum yield, and thermal stability of phosphors were enhanced. The electroluminescence spectra of BLT:Mn 4+ and BLT:Mn 4+ ,K + were measured. The spectra showed that the light emitted from the phosphors corresponded well with chlorophyll a and phytochrome P R . The results show that the BLT:Mn 4+ ,K + phosphors had good luminescence properties and application prospects and are ideal materials for plant-illuminated red phosphors.
研究领域:
材料科学
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植物学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Zhenlong Cheng,Mingzhou Meng,Xin Qiao,Yuanli Liu,Ute Resch-Genger,Jun Ou
Optical Thermometry is popular among researchers because of its non-contact, high sensitivity, and fast measurement properties. In the present experiment, Er 3+ /Yb 3+ /K + co-doped NaYF 4 nanoparticles with different K + concentrations were synthesized by solvothermal method , and the samples showed bright upconversion green emission under the excitation of a 980 nm laser. The powder X-ray diffractometer and transmission electron microscope were used to characterize the crystal structure and its surface morphology , respectively. The spectral characteristics of nanoparticles with K + doping concentration from 10% to 30% (Molar ratio) were investigated by fluorescence spectroscopy , and it was observed that the fluorescence intensity reached the maximum at the K + concentration of 20%, after which the intensity weakened when the K + content continued to increase. According to the dependence between the luminescence intensity of the sample and the laser power density and fluorescence lifetime , the intrinsic mechanism was carefully investigated. Temperature-dependent spectra of the samples were recorded in the temperature range of 315–495 K， and the maximum values of absolute sensitivity (S a ) and relative sensitivity (S r ) were measured at 0.0041 K −1 (455 K) and 0.9220%K −1 (315 K). The experimental results show that K + /Er 3+ /Yb 3+ triple-doped NaYF 4 green fluorescent nanoparticles (GFNs) have good prospects for applications in display devices, temperature sensing, and other fields.
研究领域:
材料科学
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光学工程
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2022
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IF 6.633
Hui Lu,Xiaoran Li,Feng Li,Xiuquan Xu,Rong Zhao,Chenyi Xiong,Qing Hu,Zhuoqing Miao,Miao Tian
Photocatalytic technique has been widely accepted as a promising and effective candidate for eliminating antibiotic and pathogen pollutants in aquatic environment. Herein, a novel O, K co-doped g-C 3 N 4 photocatalyst embedded with single-atom Ag (denoted as Ag/OKCN) was successfully constructed to achieve the enhanced photocatalytic degradation and disinfection efficiency under visible light irradiation. The optimal Ag/OKCN-6 could eliminate 80.4 % of tetracycline (TC) within 60 min with a rate constant of 0.0259 min −1 , which was 4.98 times of pristine g-C 3 N 4 . Meanwhile, Ag/OKCN-6 could also completely inactivate>7-log CFU·mL −1 of Escherichia coli ( E. coli ) by efficient disruption of cell membranes. The synergistic effect of O, K co-doping and single-atom Ag embedding contributed to an extended light response, preeminent separation and transfer of photoexcited charges, prolonged carrier lifetime as well as ameliorative hydrophilicity, which was conducive to the excellent photocatalytic performance. Radical trapping and electron spin resonance (ESR) experiments validated that superoxide radicals ( • O 2 − ) were crucially responsible for the superior photocatalytic activity. This work provides a facile route to construct multi-strategy modified g-C 3 N 4 -related photocatalysts for efficiently eliminating aquatic environmental pollutants.
研究领域:
环境科学
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材料科学
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生物学
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DOI
高影响因子
Advanced Science
·
2023
·Vol. 10
·期 32
·2304067
·
IF 15.1
Lin-Rong Wu,Yu-Han Zhang,Zhen Wu,Jinlv Tian,Haorui Wang,Haijun Zhao,Shoudong Xu,Liang Chen,Xiaochuan Duan,Ding Zhang,Huijuan Guo,Ya You,Zhi Zhu
High-capacity O3-type layered sodium oxides are considered one of the most promising cathode materials for the next generation of Na-ion batteries (NIBs). However, these cathodes usually suffer from low high-rate capacity and poor cycling stability due to structure deformation, native air sensitivity, and interfacial side reactions. Herein, a multi-site substituted strategy is employed to enhance the stability of O3-type NaNi 0.5 Mn 0.5 O 2 . Simulations indicate that the Ti substitution decreases the charge density of Ni ions and improves the antioxidative capability of the material. In addition, the synergistic effect of K + and Ti 4+ significantly reduces the formation energy of Na + vacancy and delivers an ultra-low lattice strain during the repeated Na + extraction/insertion. In situ characterizations verify that the complicated phase transformation is mitigated during the charge/discharge process, resulting in greatly improved structure stability. The co-substituted cathode delivers a high-rate capacity of 97 mAh g −1 at 5 C and excellent capacity retention of 81% after 400 cycles at 0.5 C. The full cell paired with commercial hard carbon anode also exhibits high capacity and long cycling life. This dual-ion substitution strategy will provide a universal approach for the new rational design of high-capacity cathode materials for NIBs.
研究领域:
材料科学
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电化学
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电池技术
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DOI
高影响因子
APPLIED SURFACE SCIENCE
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2023
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IF 6.7
Xiaokun Zhu,Shuaizhao Jin,Xiaohan Yu,Zhiyuan Yu,Xin Gu,Xiaoli Guan,Kaikai Wu,Yixin Yan,Liming Zhao,Jiamei Han,Jiabin Jiang,Xiang Liu,Xiangming Li
In this study, La 0.7 Ag 0.3- x K x MnO 3 (LAKMO, x = 0.15, 0.16, 0.17, 0.18, and 0.19) films with excellent electrical properties and low surface roughness were prepared on SrTiO 3 ( 0 0 1 ) substrates using the spin-coating method. The crystal structures and ion valence states of the LAKMO films were modified by adjusting the doping amounts of Ag and K. The Jahn–Teller effect and electron–lattice coupling were enhanced with the MnO 6 octahedron undergoes distortion. Moreover, the double-exchange interaction was improved with an increase in the number of Mn 4+ /Mn 3+ ion pairs. Under the influence of these factors, the electrical transport properties especially the temperature coefficient of resistivity ( TCR ) of the LAKMO films can be refined modulated or optimized via A-site Ag and K co-doping. When x = 0.17, the maximum TCR of LAKMO reached 11.23 % K −1 at 293.23 K. Thus, La 0.7 Ag 0.13 K 0.17 MnO 3 film with a large TCR exhibited excellent thermal properties at room temperature and was considered material for application to uncooled infrared bolometers.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
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2021
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IF 5.876
Yanfang Chen,Xuemei Yan,Haifeng Lin,Chao Wang,Jixiang Xu
Background Fe 2+ /H 2 O 2 -based photo-Fenton process is often used in pollutions removal. But, Fe-species related low activity at neutral condition hinders their practical applications. Activation of in situ generated H 2 O 2 for Fenton-like degradation of pollutions through catalysts absences of Fe species is expected. Methods A strip-like benzene and K + co-doped g-C 3 N 4 (KBCN) was constructed by the thermal polymerization of assembly of melamine and 2-aminoterephthalic acid, then post-calcination in LiCl–KCl molten salt, which was then used to degrade Rhodamine B (RhB) and Congo red (CR) via in situ generated H 2 O 2 . Significant findings Benzene and K + co-doping were critical both in increasing charge separation and enhancing the H 2 O 2 production. The yield of H 2 O 2 for KBCN was 57.5 μM in pure water after 60 min irradiation. In the absence of Fe 2+ , the in situ generated H 2 O 2 could subsequently degrade RhB and CR with the formed ·OH. The apparent rate constants of KBCN for RhB and CR degradation were 0.0446 and 0.0497 min −1 , respectively. The advantages of degradation with in situ generated H 2 O 2 in the absence of Fe 2+ can provide a new prospective to the environmental friendly Fenton-like reaction.
研究领域:
环境科学
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化学工程
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材料科学
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DOI
高影响因子
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