Science of Advanced Materials
·
2017
·
IF 1.671
Li Zhaozhi,Li Yuebin,Zhang Xianghui,Wang Lin,Hu Bo,Zhang Yi,Gu Haoshuang,Chen Wei
Near infrared (NIR)-to-visible upconversion nanoparticles of pure hexagonal phase β-NaYF4: Yb3+, Er3+ nanocrystals were successfully synthesized by a high boiling temperature organic phase synthesis strategy in oleic acid (OA), which acted
as a ligand. The upconversion photoluminescence intensity of the nanocrystals was modulated by varying the reaction temperature and the concentration of sensitizer Yb3+ ions and activator Er3+ ions. The prepared nanocrystals were investigated by transmission electron
microscopy (TEM), X-ray powder diffraction (XRD), and photoluminescence spectroscopy. All the results show that the as-prepared monodispersed upconversion nanocrystals emit high photoluminescence when excited by a 980 nm laser. It was found that the up-conversion emission spectra of β-NaYF4:
Yb3+, Er3+ presented three peaks at about 655, 540, and 521 nm. The optimized concentrations of the sensitizer Yb3+ and the activator Er3+ are 20% and 2% mmol, respectively. These highly efficient nanocrystals have exhibited great potential in bioimaging
and photoelectronic devices.
研究领域:
材料科学
·
纳米技术
·
光学材料
·
光子学
·
发光光谱学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Xiangyang Yao,Wanli Zhang,Meigui Ou,Chunlin Yang
In this paper, a composite material GQDs/Gd 2 O 3 :Er 3+ /TiO 2 , was prepared by polyol method and hydrothermal method to improve the catalytic performance of TiO 2 . The composite material is analyzed by XRD, SEM, TEM, XPS, RAMAN, UV–Vis and PEC electrochemical test, combined the DFT theoretical calculation simulation. SEM and TEM results show that spherical GQDs/Gd 2 O 3 :Er 3+ nanoparticles are covered on the surface of TiO 2 nanorods. UV–Vis absorption spectra indicates that GQDs/Gd 2 O 3 :Er 3+ broadens the wavelength range of TiO 2 in the wavelength range of 400–1000 nm. The photocurrent density and the applied bias light-electroconversion efficiency of the electrodes of GQDs/Gd 2 O 3 :Er 3+ /TiO 2 is 3.47 times and 7.6 times as that of pure TiO 2 , respectively. DFT calculations reveal that the band width of GQDs/Gd 2 O 3 :Er 3+ /TiO 2 is decreased by 2.647 eV compared to pure TiO 2 , resulting in an easier transition of electrons from valence band (VB) to conduction band (CB). Photocatalytic tests show that the degradating efficiency of methylene blue (MB) by GQDs can reach 68.52 %, which is higher than that of pure TiO 2 (61.68 %).
研究领域:
材料科学
·
纳米技术
·
光催化
·
电化学
·
光学材料
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高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2025
·
IF 5.4
Zuodong Liu,Tingting Xiong,Chengwei Zhang,Qiyue Pan,Guo Zhang,Rui Liu,Yongsheng Yu,Peng Liu,Qiangshan Jing
A series of SrF 2 phosphors co-doped with Er 3+ and Y 3+ possessing regular polygon shapes were fabricated after calcination as-synthesized particles at 600 °C for 2 h. the crystal structure and morphology of the Er, Y:SrF 2 phosphors were identified. By incorporating the non-active Y 3+ ions as buffers into Er:SrF 2 phosphors, intense green up-conversion luminescence with modulating emission colors from reddish-yellow towards the greenish area is achieved. The two-photon up-conversion mechanism was also identified by the quadratic dependence between the luminescence intensities and 808 nm excitation source powers. The up-conversion luminescence characteristics indicate that Y 3+ buffers significantly enhance the 2 H 11/2 / 4 S 3/2 → 4 I 15/2 transitions, leading to an approximately five-fold increase in the luminescence intensities ratio R(g/r) of the green to red emissions in Er:SrF 2 phosphors.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Rui Du,Chenghao Qian,Changcheng Liu,Que Huang,Yanjun Chen
Currently, the low ionic and electronic conductivities of Na 3 V 2 (PO 4 ) 3 (NVP) have been hindered its further application. In this paper, a simultaneous optimized method of Er 3+ substitution and carbon nanotubes (CNTs) enwrapping is proposed for the first time. Due to the large ionic radius of Er 3+ (89 pm vs 64 pm of V 3+ ), Er 3+ occupying the position of V 3+ makes the crystal structure more stable and alleviates the deformation of the crystal cell. Meanwhile, the interplanar spacing of NVP is broadened after introducing Er 3+ , so the de-intercalation rate of Na + can be accelerated and the kinetic properties are improved. In addition, the enwrapped CNTs connecting with amorphous carbon layers construct a conductive substrate for the fast electronic transportation, which significantly modifies the electronic conductivity. Moreover, the CNTs benefits to inhibit the agglomeration of NVP active materials and make the distribution more uniform and grain size more smaller. The decreasing size indicates a shorter pathway for Na + migration, which improves its apparent ionic diffusivity . Through the above analysis, the dual modification strategy can efficiently improve the kinetic properties of NVP system. Notably, Na 3 V 1.93 Er 0.07 (PO 4 ) 3 / C@CNTs (NVEP-0.07) submits a high capacity of 84.2 mAh g −1 at 50 C and maintains 70.6 mAh g −1 after 8000 cycles, corresponding to a high retention ratio of 83.9 %. The assembled NVEP-0.07 // CHC full cell reveals 146.2 mAh g −1 at 0.1 C, which successfully lightens the LED bulbs, indicating the excellent application potential of NVEP-0.07. Impressively, the recycled XRD/SEM/XPS results demonstrate the significantly improved crystal stability and chemical state of NVEP-0.07.
研究领域:
材料科学
·
电化学
·
储能技术
·
钠离子电池
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Junhao Ma,Yubin Wei,Tong Liu,Liang Xu,Tianhui Wang,Zhiguo Song,Jianbei Qiu,Yongjin Li
Lanthanide-doped upconversion (UC) materials are important in near-infrared (NIR) photocatalytic field because they can harvest NIR photons and then emit high-energy UV and visible light via the UC process. However, these materials still exhibit low UC luminescence efficiency, which strongly limits their practical applications. Herein, we report UC luminescence enhancement in BiOBr: Yb 3+ , Er 3+ (BYE) nanosheets by doping Li + and Zn 2+ and the elucidation of the enhancement mechanism. The XRD and Rietveld refinement results showed that the doping improved the crystallinity of the samples, with the effect of codoping being more pronounced than that of single doping. Under 980-nm laser excitation, the red emission of the Li + -Zn 2+ -codoped BYE sample increased drastically by 2.5, 4.3, and 5.3 times than that of the Li + -doped BYE, Zn 2+ -doped BYE, and BYE samples, respectively. The luminescence enhancement could be ascribed to the reduction of the crystal site symmetry and the improvement of the crystallinity upon Li + and Zn 2+ doping. Moreover, photocatalytic experiments showed that Li + and Zn 2+ doped BYE exhibited better photocatalytic performance than BYE, thus paving the way toward achieving enhanced UC luminescence efficiency.
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Journal of Materials Chemistry B
·
2023
·Vol. 11
·期 24
·5565-5573
·
IF 7
Xuran Zhang,Jianfei Ding,Liang Zou,Huihui Tian,Ying Fang,Jinfen Wang
Near-infrared optogenetics based on up-conversion materials provides a promising tool for the dissection of neural circuit functions in deep brain regions. However, it remains a challenge to combine near-infrared up-conversion optogenetic stimulation with high-density electrophysiological recording in a minimally invasive manner. Here, we develop a flexible device for simultaneous electrophysiological recording and near-infrared optogenetics. The flexible device is constructed by integrating polymer-based flexible recording microelectrodes with electrodeposited NaYF4:Yb3+, Er3+ up-conversion films that can convert deep-tissue-penetrating near-infrared light into visible light for optogenetic activation of C1V1-expressing neurons. The emission properties of the up-conversion films are optimized for green light emission to stimulate C1V1 opsins. Owing to their minimized surgical footprint and high mechanical compliance, chronically implanted devices enable simultaneous electrophysiological recording and near-infrared optogenetic modulation of neuronal activities in the brain.
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PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
·
2023
·
IF 5.4
Xin Yang,Zhaopeng Zhang,Jiang Wu,Zhengrong Zhu,Tao Zhang,Ping He,Yongfeng Qi,Shang Xiang,Mengjie Bai,Xingyue Qi
Construction of heterojunction and formation of oxygen vacancy are effective methods to improve the performance of photocatalysts. In this work, Er 3+ -doped BiOIO 3 /g-C 3 N 4 photocatalyst with oxygen-rich vacancies was prepared by a simple hydrothermal and calcination method for the photocatalytic oxidation of elemental mercury. The structural properties of BiOIO 3 /g-C 3 N 4 /Er 3+ were analyzed by XRD, SEM and BET. The results showed that all samples exhibited good photocatalytic oxidation ability for Hg 0 under visible light irradiation. Among them, the photocatalyst with Er 3+ -doped BiOIO 3 /g-C 3 N 4 and then calcined has the highest removal efficiency of Hg 0 , which is 68.83%. This may be due to the increase of oxygen vacancy caused by Er 3+ doping, which enables the photocatalyst to have higher electron transfer rate and wider visible light absorption range. Finally, the possible mechanism of photocatalytic oxidation of gaseous elemental mercury with BiOIO 3 /g-C 3 N 4 /Er 3+ photocatalyst was proposed. This study provides some reference for the design and application of photocatalysts containing oxygen vacancies.
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高影响因子
Frontiers in Chemistry
·
2023
·
IF 5.5
Huang Hanchang,Zhong Yanyi,Li Mingchen,Cui Wenda,Yu Tongcheng,Zhao Guomin,Xing Zhongyang,Guo Chuan,Han Kai
In Yb-Er co-doped upconversion (UC) nanomaterials, upconversion luminescence (UCL) can be modulated to generate multiband UCL emissions by changing the concentration of activator Er3+. Nonetheless, the effect of the Er3+ concentrations on the kinetics of these emissions is still unknown. We here study the single β-NaYF4:Yb3+/Er3+ microcrystal (MC) doped with different Er3+ concentrations by nanosecond time-resolved spectroscopy. Interestingly, different Er3+ doping concentrations exhibit different UCL emission bands and UCL response rates. At low Er3+ doping concentrations (1 mol%), multiband emission in β-NaYF4:Yb3+/Er3+ (20/1 mol%) MCs could not be observed and the response rate of UCL was slow (5–10 μs) in β-NaYF4:Yb3+/Er3+. Increasing the Er3+ doping concentration to 10 mol% can shorten the distance between Yb3+ ions and Er3+ ions, which promotes the energy transfer between them. β-NaYF4:Yb3+/Er3+ (20/10 mol%) can achieve obvious multiband UCL and a quick response rate (0.3 µs). However, a further increase in the Er doping concentration (80 mol%) makes MCs limited by the CR process and cannot achieve the four-photon UC process (4F5/2 → 2K13/2 and 2H9/2 → 2D5/2). Therefore, the result shows that changing the Er3+ doping concentration could control the energy flow between the different energy levels in Er3+, which could affect the response time and UCL emission of the Yb/Er doped rare earth materials. Our work can facilitate the development of fast-response optoelectronics, optical-sensing, and display industries.
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PubMed
高影响因子
JOURNAL OF RARE EARTHS
·
2023
·
IF 4.9
Boxu Xu,Chao Song,Jie Song,Rui Huang,Shaomin Lin,Zhenxu Lin,Yi Zhang,Dejian Hou,Jun Song
In this study, Er 3+ /Yb 3+ codoped Y 2 O 3 –ZnO ceramic phosphors were prepared by sol–gel method. The samples had two emission bands, namely, green (535 nm) and red (660 nm), which are attributed to Er 3+ : 2 H 11/2 ( 4 S 3/2 ) → 4 I 15/2 and Er 3+ : 4 F 9/2 → 4 I 15/2 radiative transitions , respectively. The samples exhibited green- and red-emission intensity enhancement by 1.728 and 2.286 times that of the pure Y 2 O 3 host, respectively and by 514.468 and 214.341 times that of the pure ZnO host. The emission intensities are first enhanced by lattice expansion. With the change of Y:Zn ratio, the high surface energy is converted into low crystal surface resulting in the change of asymmetry crystal field for matrix. When the intensity of the asymmetric crystal field reaches maximum, both emissions are further boosted. When the high surface energy transforms into crystal surface energy, the microstructure changes into a compact mesoporous structure. Consequently, the chemical stability of the samples improves significantly, and the final emission band of the three samples with mesoporous structures is continuously red.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 36
·1-9
·
IF 2.8
Xiong Lu,Hu Haisheng,Liu Meitang,Zhang Chongji
Upconversion materials have significant application prospects in many fields due to the advantages of being excited by infrared light. However, the development of upconversion materials is constrained by low upconversion efficiency and low luminescence intensity. The aim of this work is to improve the luminescence efficiency and intensity of fluorine-based upconversion luminescent materials through ternary alkali metal doping. A series of ternary alkali metal-doped Li x Na y K (1−x−y) YF 4 :Yb 3+ , Er 3+ novel upconversion luminescent materials were synthesized by a one-step facile hydrothermal method, and their mechanisms were explored. The results show that the doping of Li, Na, and K ions changes the crystal structure of Li x Na y K (1−x−y) YF 4 :Yb 3+ , Er 3+ , thereby affecting the spatial structural relationship between the rare-earth ions, which changes the energy transfer efficiency to them. The luminescence intensity of the prepared Li x Na y K (1−x−y) YF 4 :Yb 3+ , Er 3+ was 30 times higher than that of the undoped samples when doped with Li, Na, and K ions in a molar ratio of 10:6:9. This study provides a simple and effective method for the preparation of upconversion materials with excellent luminescent properties.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yinghao Wei,Sen Yang,Chenyang Zhang,Guanying Chen,Ai-Hua Li
In recent years, lanthanide doped materials have been extensively studied in the field of fluorescence temperature sensing due to their abundant emission levels and sensitive thermal response. Temperature sensing based on fluorescence intensity ratio (FIR) of upconversion nanoparticles has the advantages of fast temperature response, non-aggressiveness, and high spatial resolution. However, the most reported FIR sensing has limited sensitivity, probably due to the use of thermal coupling levels. Herein, we report a novel FIR temperature measurement based on non-thermal coupling levels of NaGdF 4 :Yb 3+ /Er 3+ @NaGdF 4 @NaGdF 4 :Yb 3+ /Tm 3+ core-shell-shell nanostructure , which has high sensitivity and robustness simultaneously. The relative sensitivity based on I 801 / I 654 and I 801 / I 841 of Tm 3+ to Er 3+ can reach up to 4.56 (303 K) and 3.82% K −1 (313 K), respectively. Between them, FIR of I 801 / I 841 is independent of excitation power and time. These results show the great potential of FIR based on non-thermal coupling levels in high-sensitive and robust temperature sensors .
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 106
·期 2
·1333-1343
·
IF 4.186
Jie Fu,Liuyan Zhou,Yanling Chen,Jianhua Lin,Renguang Ye,Lei Lei,Yang Shen,Degang Deng,Shiqing Xu
Here, Bi 3+ , Er 3+ co-activated gadolinium phosphors with multimode emission properties are prepared, which can emits blue, green, and orange light under the excitation of ultraviolet, 980 and 1550 nm, respectively. Moreover, BaGd 2 O 4 :Bi 3+ , Er 3+ can show multicolor luminescence under different excitation conditions, such as pump light source, ambient temperature, working current, and other factors. Based on the dynamic luminescence characteristics, the dynamic anti-counterfeiting experiments are designed based on the phosphor. At the same time, the material also shows multimode temperature sensing characteristics. Under the excitation of 980 nm laser, three strong up-conversion signals Er 3+ ions are generated at 528 nm ( 2 H 11/2 ), 555 nm ( 4 S 3/2 ), and 668 nm ( 4 F 9/2 ), which have different temperature dependences. Based on the fluorescence intensity ratio between thermal-coupled energy levels ( 2 H 11/2 / 4 S 3/2 ) and nonthermal-coupled energy levels ( 2 H 11/2 / 4 F 9/2 ) of Er 3+ ions, respectively, the dual-mode temperature thermometer was constructed with high-temperature sensitivity. In addition, the fluorescence lifetime of Bi 3+ ions also has a strong temperature dependence, which can be used as another temperature detection signal, greatly improving the stability of thermometers under harsh conditions. Therefore, the material has a bright prospect in the field of anti-counterfeiting and temperature sensing.
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