Journal of Cleaner Production
·
2021
·
IF 9.297
Banghao Du,Gongduan Fan,Shangwu Yang,Zhuoyi Chen,Jing Luo,Weiwei Yu,Junyi Yu,Qi Wei,Yushan Lu
Reactive oxygen species (ROS) play a considerable role in the catalytic reaction for removing organic pollutants, however, the generation and transformation mechanism by catalyst with light and ultrasonic irradiation still requires intensive investigation. In this study, a novel Er 3+ -CdS/MoS 2 (ECMS) composite was synthesized, and the synergetic degradation effects for 17β-estradiol (17β-E2) during the sonophotocatalytic (SPC) process were investigated. The contribution of ROSs for eliminating 17β-E2 during the SPC process through quenching experiments was generally ranked in the following order: superoxide radical (•O 2 − ) ≈ hole (h + ) > hydroxyl radical (•OH) > H 2 O 2 > singlet oxygen ( 1 O 2 ). •OH plays a crucial role in 17β-E2 removal by ECMS under sonocatalysis and photocatalysis conditions. The transformation process among ROSs was further analyzed and elucidated in the light of the probe measurement results with positive or negative correlation among ROSs. Besides, we observed a phenomenon that the generated concentration of •O 2 − rises first and then falls during the SPC process, which might be attributed to the formation of 1 O 2 via the oxidation of h + or recombination with •OH. This work clarifies the underlying mechanisms of sonophotocatalytic generation and transformation of ROSs in depth.
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Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 46
·16143-16151
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IF 6.4
Yixiao Han,Leipeng Li,Chongyang Cai,Pei Li,Tao Li,Xiumei Han,Dengfeng Peng,Yanmin Yang
Mechanoluminescent materials have gained considerable attention over the past few years due to their unique characteristic of converting some useless mechanical actions in our daily life like compression and friction into usable light sources. However, the application scenarios of mechanoluminescent materials are still quite limited, mainly to stress sensors and visualization of pressure. Our work aims to solve this problem. Here, we demonstrate that Y2O2S:Er3+ with excellent mechanoluminescence (ML) could be used for energy-saving temperature sensing. Upon stimulation of external force, Y2O2S:Er3+ emits bright green ML that is attributed to the 2H11/2 → 4I15/2 and 4S3/2 → 4I15/2 transitions of Er3+. These transitions are confirmed to conform with the Boltzmann distribution during a dynamic temperature-changing test. In addition, we confirm the feasibility of the ML thermometry framework in Er3+-doped Gd2O2S and Lu2O2S. Our work provides a new perspective for broadening the application scenarios of mechanoluminescent materials.
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JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Ronghui Liu,Quanxing Wei,Lianning Dou,Liming He,Zonghao Lei,Lijie Sun,Yanfei Zou,Shikun Su,Bing Teng,Fei You,Jianhong Li,Degao Zhong
Accurate measurement of temperature during photothermal conversion is crucial for the application of up-conversion photothermal conversion fluorescent materials. In this paper, a kind of SrIn 2 O 4 : Yb 3+ , Er 3+ up-conversion phosphor with strong photothermal conversion ability and high-precision dual-mode temperature measurement performance was synthesized by high-temperature solid-state method. Under 980 nm laser excitation, a high-precision temperature measurement with a maximum relative sensitivity of S r = 1.2 %K −1 was achieved by using the fluorescence intensity ratio of the thermally coupled energy level pairs ( 2 H 11/2 / 4 S 3/2 ) of Er 3+ ions. In addition, we found that the luminescent color of the synthesized phosphor can span a large color gamut interval with the rise of temperature, realizing the optical temperature measurement based on temperature-induced color coordinate shift. On this basis, we realized dual-mode temperature monitoring and temperature self-calibration during the photothermal conversion process of SrIn 2 O 4 : Yb 3+ , Er 3+ phosphors. These results are of great practical value for the application of photothermal conversion fluorescent materials in micro-zone heating and temperature self-monitoring.
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Nanomaterials
·
2020
·Vol. 10
·期 8
·1475
·
IF 4.324
Xiaofan Zhao,Zeyun Wu,Zining Yang,Xu Yang,Yiyang Zhang,Maohui Yuan,Kai Han,Changqing Song,Zongfu Jiang,Hongyan Wang,Shuiqing Li,Xiaojun Xu
Er3+-sensitized upconversion nanoparticles (UCNPs) have attracted great attention due to their tunable upconversion (UC) emissions, low cytotoxicity, high resistance to photobleaching and especially multiple effective excitation wavelengths. However, detailed energy conversion between Er3+and Tm3+ions in Y2O3UCNPs is still a problem, especially under multi-wavelength and variable pulse width excitation. In this work, we successfully fabricated a series of Er3+-sensitized Y2O3nanocrystals by a spray flame synthesis method with a production rate of 40.5 g h−1. The as-prepared UCNPs are a pure cubic phase with a mean size of 14 nm. Excited by both 980 and 808 nm lasers, the tunable upconversion luminescence (UCL) from Er3+ions was achieved by increasing the Er3+doping concentration, co-doping Tm3+ions and extending excitation pulse-width. The investigations of the lifetimes and the laser power dependence of UC emissions further support the proposed mechanism, which provides guidance for achieving effective color control in anticounterfeiting and multiplexed labeling applications. In addition, the red UC emission at about 5 mm beneath the tissue surface was observed in an ex vivo imaging experiment under the excitation of 808 nm laser, indicating that the Y2O3:Er3+/Tm3+UCNPs have great prospects in further biological applications.Keywords:multicolor tuning;dual-wavelength excitation;upconversion luminescence;spray flame synthesis;Y2O3nanocrystal;biological applications
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PubMed
高影响因子
OPTICAL MATERIALS
·
2020
·
IF 2.779
Xingzhen Huang,Kan Huang,Liken Chen,Nan Chen,Ruoshan Lei,Shilong Zhao,Shiqing Xu
The Y 2 Ti 2 O 7 : Er 3+ /Yb 3+ phosphors co-doped with Li + and Li + /Mg 2+ ions were prepared via solid state reaction method. The effects of Li + and Mg 2+ co-doping on the structure and morphology of Y 2 Ti 2 O 7 : Er 3+ /Yb 3+ phosphors were investigated by X-ray diffraction (XRD), electron paramagnetic resonance (EPR) spectra and field emission scanning electron microscopy (FESEM) observations. The 980 nm excitation assisted UC luminescence intensity for green and red band was enhanced by 8.7 and 14.3 times respectively after co-doping with Li + /Mg 2+ ions in Y 2 Ti 2 O 7 : Er 3+ /Yb 3+ , which could be explained based on the variations in crystal structure and particle size. Using the fluorescence intensity ratio (FIR) technique, the impact of 980 nm pump power on the thermometric behaviors was studied based on the thermally coupled levels of 2 H 11/2 and 4 S 3/2 of Er 3+ ions. Due to the unique thermal properties of the Y 2 Ti 2 O 7 host, the temperature increment caused by laser thermal effect was minimized, benefiting the consistency of FIR data over a wide range of pump power density. Besides, a high relative sensor sensitivity of 1.17%K −1 was obtained for Y 2 Ti 2 O 7 : Er 3+ /Yb 3+ /Li + /Mg 2+ phosphors. These characteristics may make the studied system applicable for optical temperature sensor with high accuracy.
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NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 18
·15436-15443
·
IF 3.201
Wei Zheng,Rui Wang,Yuemei Li,Yanling Xu,Baoyu Su
Photon upconversion holds tremendous promise in many fields, including photovoltaics, biological imaging, and multi-dimensional display. However, insufficient upconversion emission intensity still limits its utilization for many potential applications. Herein, a type of VO2 (B) nanoflowers with unique size and high crystalline quality, exhibiting a bright upconversion emission, is reported. More importantly, a new method, i.e., higher power-sensitization, is established to improve upconversion emission signals. After higher power-sensitization, a drastic increase in upconversion emission intensity to 553-fold and 158-fold was observed for green and total emissions, respectively, at a pump power of 90 mW. At the same time, the upconversion of light at low excitation powers (2, 90 mW) was observable by the naked eye. We identified that the welded structure, favouring the energy transfer from sensitizers to activators, was key for achieving this enhancement. This study not only suggests a new pathway for building high-efficiency upconversion systems, but also provides insights for improving the practical applications of upconversion materials.
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LANGMUIR
·
2014
·
IF 4.384
Min Liu,Hui Liu,Shufen Sun,Xuejiao Li,Yanmin Zhou,Zhiyao Hou,Jun Lin
Porous hydroxyapatite (HAp) composite fibers functionalized with up-conversion (UC) luminescent and magnetic Na(Y/Gd)F4:Yb3+,Er3+ nanocrystals (NCs) have been fabricated via electrospinning. After transferring hydrophobic oleic acid-capped Na(Y/Gd)F4:Yb3+,Er3+ NCs into aqueous solution, these water-dispersible NCs were dispersed into precursor electrospun solution containing CTAB. Na(Y/Gd)F4:Yb3+,Er3+@HAp composite fibers were fabricated by the high temperature treatment of the electrospun Na(Y/Gd)F4:Yb3+,Er3+ NCs decorated precursor fibers. The biocompatibility test on MC 3T3-E1 cells using MTT assay shows that the HAp composite fibers have negligible cytotoxity, which reveals the HAp composite fibers could be a drug carrier for drug delivery. Because the contrast brightening is enhanced at increased concentrations of Gd3+, the HAp composite fibers can serve as T1 magnetic resonance imaging contrast agents. In addition, the composites uptaken by MC 3T3-E1 cells present the UC luminescent emission of Er3+ under the excitation of a 980 nm near-infrared laser. The above findings reveal Na(Y/Gd)F4:Yb3+,Er3+@HAp composite fibers have potential applications in drug storage/release and magnetic resonance/UC luminescence imaging.
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高影响因子
RSC Advances
·
2015
·Vol. 5
·期 82
·66807-66814
·
IF 3.84
Bin Zhou,Youfa Wang,Donglin Xia
Pure β-KYF4 nanocrystals codoped with Er3+/Yb3+ and Tm3+/Yb3+ were successfully synthesized via the thermal decomposition of trifluoroacetate precursors using oleic acid and octadecylene as coordinating solvents. The up-conversion optical properties of the β-KYF4 nanocrystals with different lanthanide (Ln)-doped ions (Yb3+/Er3+, Yb3+/Tm3+) were investigated. It is found that the colloidal dispersion of β-KYF4:Yb,Er/Tm nanocrystals display strong multiple up-conversion emission spanning from the deep UV-to-NIR regions under 980 nm excitation. Pure β-KYF4 nanocrystals codoped with Er3+/Yb3+ and Tm3+/Yb3+ can emit bright blue, green, yellow, and red emissions visible to the naked eye by adjusting the concentrations of Yb3+ sensitizer ion and Er3+ or Tm3+ activator ions. Moreover, the UC luminescent colors can be tuned for the four colors from blue to green to yellow and finally to red emission in the β-KYF4:X%Yb3+/(0.2%–2%)Er3+ and β-KYF4:25%Yb3+/0.2%Tm3+ colloidal samples. This work substantially expands our understanding of this category of KYF4 upconversion nanocrystals.
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Biomedical Optics Express
·
2016
·Vol. 7
·期 6
·2174-2185
·
IF 3.344
Xuanyuan Wen,Baoju Wang,Ruitao Wu,Nana Li,Sailing He,Qiuqiang Zhan
Simultaneous deep macroscopic imaging and microscopic imaging is in urgent demand, but is challenging to achieve experimentally due to the lack of proper fluorescent probes. Herein, we have designed and successfully synthesized simplex Er3+-doped upconversion nanoparticles (UCNPs) with double excitation bands for simultaneous deep macroscopic and microscopic imaging. The material structure and the excitation wavelength of Er3+-singly doped UCNPs were further optimized to enhance the upconversion emission efficiency. After optimization, we found that NaYF4:30%Er3+@NaYF4:2%Er3+ could simultaneously achieve efficient two-photon excitation (2PE) macroscopic tissue imaging and three-photon excitation (3PE) deep microscopic when excited by 808 nm continuous wave (CW) and 1480 nm CW lasers, respectively. In vitro cell imaging and in vivo imaging have also been implemented to demonstrate the feasibility and potential of the proposed simplex Er3+-doped UCNPs as bioprobe.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·
IF 3.582
Ying Zhou,Shengnan Wei,Siyi Li,Xudong Liu,Xiaoqing Shu,Xu Zhang,Cheng Zhao,Zepeng Qu,Dawei Fang,Zhaohong Zhang,Jun Wang
By using TiO 2 and Ta 2 O 5 colloids, a stable and efficient visible-light driven photocatalyst , Er 3+ :Y 3 Al 5 O 12 /TiO 2 Ta 2 O 5 /MoO 2 composite membrane , was successfully prepared via sol–gel dip coating method at room temperature . The XRD , FTIR, SEM , TEM and EDX results confirm that approximately spherical Er 3+ :Y 3 Al 5 O 12 nanoparticles were embedded in TiO 2 Ta 2 O 5 matrix. UV–vis absorption and PL spectra of Er 3+ :Y 3 Al 5 O 12 were also determined to confirm the visible absorption and ultraviolet emission. The photocatalytic hydrogen generation was carried out by using methanol as sacrificial reagent in aqueous solution under visible-light irradiation. Furthermore, some main influence factors such as heat-treated temperature, heat-treated time and molar ratio of TiO 2 and Ta 2 O 5 on visible-light photocatalytic hydrogen generation activity of Er 3+ :Y 3 Al 5 O 12 /TiO 2 Ta 2 O 5 /MoO 2 composite membrane were studied in detail. The experimental results showed that the photocatalytic hydrogen generation activity of Er 3+ :Y 3 Al 5 O 12 /TiO 2 Ta 2 O 5 /MoO 2 composite membrane heat-treated at 550 °C for 3.0 h was highest when the molar ratio of TiO 2 and Ta 2 O 5 was adopted as 1.00:0.50. And that a high level photocatalytic activity can be still maintained after four cycles. In addition, a possible mechanism for the visible-light photocatalytic hydrogen generation of the Er 3+ :Y 3 Al 5 O 12 /TiO 2 Ta 2 O 5 /MoO 2 membrane was proposed based on PL spectra.
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ADVANCED POWDER TECHNOLOGY
·
2025
·
IF 4.2
Lijie Gao,Yun Wang,Meiting Li,Xuejiao Wang,Qi Zhu,Ji-Guang Li
ZnWO 4 :Yb 3+ /Er 3+ upconversion (UC) nanophosphors were successfully synthesized by hydrothermal reaction at 180 ℃ and subsequent calcination at 700 ℃ for crystallinity improvement and better incorporation of dopant ions. The phosphors were analyzed to emit green (∼533 nm; 2 H 11/2 → 4 I 15/2 transition of Er 3+ ), green (∼546 nm; 4 S 3/2 → 4 I 15/2 ) and red (∼660 nm; 4 F 9/2 → 4 I 15/2 ) light under 980 nm laser excitation, all through a two-photon process. The incorporation of Na + and K + , especially K + , was found to remarkably modify the UC performance of Er 3+ , in terms of red/green intensity ratio (luminescence color), fluorescence lifetime and thermal stability of luminescence, which was rationalized by considering 4 F 7/2 + 4 I 11/2 → 4 F 9/2 cross relaxation and lattice defects/local structure. The optimal ZnWO 4 :0.08Yb 3+ ,0.02Er 3+ phosphor, which contains ∼ 0.97 at.% Na + and 0.16 at.% K + , was demonstrated to have the potential for optical temperature sensing with the thermally coupled 2 H 11/2 / 4 S 3/2 energy levels of Er 3+ .
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yan Sun,Aowen Chen,Jingdao Yang,Kun Zhang,Sikai Wang,Xuerong Xu,Luyue Niu,Yue Jing,Ci Wang,Jing Ren,Jianzhong Zhang
Expanding gain bandwidth into the L-band for erbium-doped fiber amplifiers (EDFAs) is a crucial strategy to overcome limitations in prevalent C-band focused commercial silica-based EDFAs, significantly boosting optical network transmission capacity. Herein, we synthesized Er 3+ -doped broadband near-infrared emission tellurite glasses utilizing the melt quenching process, systematically exploring the impact of ZnCl 2 on the glass structure and optical properties. The 82TeO 2 –3Nb 2 O 5 –15ZnCl 2 –3Er 2 O 3 (TNZ15) glass emerged as a standout candidate for broadband amplifiers around wavelength at 1.55 μm. With escalating ZnCl 2 concentration, a discernible red shift in the emission peak wave lines was observed, accompanied by an expansion of the full width at half maximum (FWHM) from 98 nm to 106 nm. Noteworthy characteristics of all samples included exceptional thermal stability and elevated near-infrared (NIR) transmittance. Application of the Judd-Ofelt (J-O) theory facilitated the calculation of J-O parameter intensity, providing deeper insights into the optical behavior of the materials. Finally, the evaluation of TNZ15 planar optical waveguides, employing the vertical top pumping mode of two 980 nm LEDs, encompassed both the C-band (1530–1565 nm) and the L-band (1565–1625 nm). The results underscore the potential of TNZ15 glass as a promising gain material for broadband optical amplifiers and lasers, offering valuable insights into the development of next-generation optical amplification technologies.
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