RSC Advances
·
2021
·Vol. 11
·期 48
·30006-30019
·
IF 3.361
Zhaoliang Yan,Qingfeng Guo,Libing Liao,Pengfei Shuai,Feifei Huang,Lefu Mei
In this paper, a novel cryolite-type up-conversion luminescent material K3Sc0.5Lu0.5F6: Er3+, Yb3+ with controllable crystal form was synthesized by a high temperature solid state method. K3Sc0.5Lu0.5F6: Er3+, Yb3+ can crystallize in monoclinic or cubic form at different temperatures. The composition, structure and up-conversion luminescence (UCL) properties of K3Sc0.5Lu0.5F6: Er3+, Yb3+ samples with different crystal form were investigated in detail. It is impressive that both monoclinic and cubic forms of K3Sc0.5Lu0.5F6: Er3+, Yb3+ show green emission (2H11/2/4S3/2→4I15/2). The luminescence intensity of cubic K3Sc0.5Lu0.5F6 is much higher than that of the monoclinic form, and the reasons are also discussed in detail. The results show that the luminescence intensity of up-conversion materials can be effectively tuned by controlling the crystal form. According to the power dependent UCL intensity, the UCL mechanism and electronic transition process were discussed. In addition, the fluorescence decay curves were characterized and the thermal coupling levels (TCLs) of Er3+ (2H11/2/4S3/2 → 4I15/2) in the range of 304–574 k were used to study the optical temperature sensing characteristics. All the results show that K3Sc0.5Lu0.5F6: Er3+, Yb3+ can be used in electronic components and have potential application value in temperature sensing fields.
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高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Rui Yun,Jingqi He,Li Luo,Xiaohua Liu,Zhaogang Nie,Weiren Zhao,Hongli Wen
Upconverting materials excited by near-infrared light are getting attention due to their biological applications in cancer treatment. Er 3+ , Yb 3+ and Nd 3+ tri-doped LiLn(WO 4 ) 2 (Ln = Y/La/Gd) phosphors were synthesized via the typical solid-state method. LiGd(WO 4 ) 2 : Er 3+ , Yb 3+ , Nd 3+ (LGW) phosphors exhibit the most intense green emission under 785 nm excitation among the three doped host materials, which is ascribed to their lowest phonon density and the strong absorption properties. Nd 3+ and Yb 3+ concentration effect on its luminescent properties and the energy transfer of Nd 3+ →Yb 3+ →Er 3+ under 785 nm excitation are discussed. The ratio of integrated intensity from the 4 S 3/2 / 2 H 11/2 → 4 I 15/2 transition of Er 3+ is characteristic of the optical temperature sensing based on fluorescence intensity ratio (FIR). LGW shows high absolute sensitivity about 0.0070 K −1 at 439 K and broad temperature sensing ranging from 200 K to 600 K under the excitation of 785 nm compared with systems doped with Er 3+ . Our significant results predicate the potential applications of this lanthanum-doped tungstate in optical thermometers.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Wen Ge,Kong Liu,Peizhi Yang,Shukang Deng,Lanxian Shen
In this work, W 6+ ions doped Bi 2 MoO 6 :20%Yb 3+ , 2%Er 3+ samples were successfully synthesized by a facile and modified hydrothermal method . The main morphology of Bi 2 MoO 6 samples were hollow microsphere structure assembled by nanosheets . The particle size was slightly increased as enhancing W 6+ ions doping concentration to 5%, then decreased as the doping concentration increased. Besides, doping W 6+ ions can increase the band gap of products from 2.65 eV to 2.71eV. The upconversion emission intensity of all samples was strongly influenced by the W 6+ ions doping concentration. The luminescent intensity enhanced with the doping concentration increasing up to 3%, then decreased when the W 6+ ions concentration further increased. Moreover, the intensity of red emission increased by a large margin than that of green-light region. Besides, the lifetime of 4 F 9/2 states of Er 3+ ions for Bi 2 MoO 6 :20%Yb 3+ , 2%Er 3+ , 3%W 6+ (τ 655 = 583.64 μs) had significant longer lifetime relative to the Bi 2 MoO 6 :20%Yb 3+ , 2%Er 3+ (τ 655 = 70.29 μs).
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JOURNAL OF ELECTRONIC MATERIALS
·
2021
·Vol. 50
·期 3
·1189-1195
·
IF 1.938
Li Ke,Chen Tingting,Mao Huibing,Chen Ye,Wang Jiqing
YVO 4 :Yb 3+ :Er 3+ nanoparticles and their mixture with Au nanoparticles have been fabricated by a simple chemical method. With the excitation of a 975-nm laser, both samples had strong upconversion emissions at 2.18, 2.25, and 2.36 eV, which correspond to the transitions 4 F 9/2 → 4 I 15/2 , 4 S 3/2 → 4 I 15/2 and 2 H 11/2 → 4 I 15/2 of Er 3+ ions, while the emission at 2.36 eV has a large overlap with the resonant absorption energy, 2.34 eV, of the Au nanoparticles. With the coupling of the Au nanoparticles, the upconversion emission at 2.36 eV presents a strong quenching effect which is due to the energy transfer from the Er 3+ ions to the Au nanoparticles. This depends on the energy difference between the emission of the Er 3+ ions and the absorption of the Au nanoparticles. The upconversion power dependence shows that the slope factor of the power dependence is about 3 for a high pump power, which means that the upconversion process is a three-photon process for both samples.
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Journal of Materials Chemistry B
·
2020
·Vol. 8
·期 37
·8634-8643
·
IF 5.344
Yongmei Li,Yuemei Li,Yandong Bai,Laixiang Lin,Yina Sun
Cerium oxide nanoparticles (NPs) due to their advanced catalytic performance have been widely used to treat oxidative damage. However, Ce2O3 NPs have not been further investigated in the treatment of acute oxidative injury in vivo. It is meaningful to improve the efficiency for treatment of acute oxidative injury with NPs in vivo. In this report, we designed Er3+-doped Ce2O3 (Er/Ce2O3) NPs with a size of 7.9 nm, which were used to treat acute liver injury. Er/Ce2O3 NPs realized high-efficiency catalysis of hydrogen peroxide (H2O2) at room temperature. An acute liver damage model was established through intraperitoneal injection of lipopolysaccharide (LPS) in C57 mice. By analyzing histopathological and biochemical indexes, Er/Ce2O3 NPs showed a significant improvement in LPS-induced acute liver injury. Acute liver oxidative damage can be treated within 24 hours, which proved the high catalytic efficiency of Er/Ce2O3 NPs in vivo. The activities of SOD, GPx and CTA increased and production of ROS decreased with Er/Ce2O3 NP treatment in comparison with LPS-induced injury, indicating that the mechanism of Er/Ce2O3 NPs in the treatment of acute oxidative damage of liver was mainly via catalysis of ROS products. Moreover, the protein expression levels of TNF-α, CD45 and IL-1β in liver decreased in the Er/Ce2O3 NPs-treated group, which indicated that Er/Ce2O3 NPs have the function of anti-inflammation property. Therefore, Er/Ce2O3 NPs can be applied to treat and prevent diseases caused by acute oxidative damage.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Jiajia Meng,Yanyan Cui,Yaling Wang
Lanthanide-doped nanoparticles (LDNPs) are widely used in biophotonics due to their narrow emission band, long lifetime and broad-spectrum tunable luminescence properties. Usually, photosensitizers for biotherapeutic applications need to be triggered by visible light, while bioimaging requires near-infrared (NIR) light with better penetration. However, it is still challenging to achieve efficient luminescence emission in the visible to second near-infrared (NIR-II, 1000–1700 nm) range simultaneously for multifunctional nanoparticles excited at a single NIR wavelength. Here, a simple NaYF 4 :Er/Ce@NaYbF 4 :Er@NaYF 4 :Nd core-shell-shell nanoparticle with interfacial energy transfer by the Yb-sensitized shell and partition doping of Er 3+ under 808 nm excitation, which allows the system to achieve visible and NIR-II luminescence emission from different partitions of Er 3+ . When Ce 3+ is introduced into the core, the Er 3+ in the Yb-sensitized shell is responsible for the emission in the visible region, while the core-doped Er 3+ is mainly responsible for the emission at 1550 nm in the NIR-II. In addition, this core-shell-shell nanostructure has a long luminescence emission lifetime in the visible and NIR-II regions, especially the luminescence lifetime of Er 3+ at 1550 nm is extended to 6.4 ms. More importantly, efficient 1 O 2 generation can be achieved by coupling core-shell-shell nanoparticles with photosensitizer. These results will provide previously unattainable opportunities for LDNPs in biotherapeutic and imaging applications.
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Aggregate
·
2023
·
IF 18.8
Xinyue Lao,Yuan Liu,Lihua Li,Menglin Song,Yingjin Ma,Mo Yang,Guanying Chen,Jianhua Hao
Outbreaks of infectious viruses offer a formidable challenge to public healthcare systems and early detection of viruses is essential for preventing virus propagation. In this work, an ultrasensitive plasmon-enhanced fluorescence resonance energy transfer (FRET) biosensor based on core-shell upconversion nanoparticle (csUCNP) and gold nanoparticle (AuNP) for accurate detection of SARS-CoV-2 viral RNA is presented. In this biodetection assay, the Tm 3+ /Er 3+ co-doped csUCNP NaGdF 4 :Yb/Tm@NaYF 4 :Yb/Er acts as an energy donor and AuNP serves as an energy acceptor. The upconversion emission of Tm 3+ and the design of the core-shell structure led to a simultaneous surface plasmon effect of AuNP. The localized surface plasmon resonance (LSPR) arising from collective oscillations of free electrons significantly enhanced FRET efficiency between Er 3+ and AuNP. The as-prepared biosensor obtained a limit of detection (LOD) as low as 750 a m , indicating that the integration of FRET and surface plasmon into one biodetection assay significantly boosted the sensitivity of the biosensor. In addition, samples extracted from clinical samples are also utilized to validate the effectiveness of the biosensor. Therefore, this innovative plasmon-enhanced FRET biosensor based on Tm 3+ /Er 3+ co-doped csUCNP may pave the way for rapid and accurate biodetection applications.
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JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Chuncheng Zhang,Chaomin Zhang,Chao Yun
In this paper, Er 3+ /Ho 3+ co-doped fluoride glasses were prepared by the high temperature melt-quenching technique. Pumped by the 980 nm LD , as a result of the emission spectra overlapping of Er 3+ and Ho 3+ ions, a broadband mid-infrared emission band from 2530 to 2950 nm with a full width at half maximum of the synthetic fluoride glasses near 231 nm was obtained, which exist latent application in wide band tunable mid-infrared fiber laser. Furthermore, the intense 4.1 μm mid-infrared fluorescence (3600–4400 nm) was obtained and the FWHM was 320 nm. The up-conversion emission peaks around 525, 546 and 660 nm, near-infrared emissions at 1.2 and 1.5 μm together with mid-infrared fluorescence around 2.0 μm was observed in Er 3+ /Ho 3+ co-doped fluoride glass. Moreover, the relevant energy transfer processes were discussed in detail based on the emission spectrum and the energy level transition processes. The results indicate that the fabricated Er 3+ /Ho 3+ co-doped fluoride glasses exist prominent emission features for fiber laser gain medium.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2018
·Vol. 18
·期 12
·8258-8268
·
IF 1.354
Tong Chao,Xie Shaowen,Zhou Hu,Li Na,Gong Liang,Jian Jian,Zhang Changfan,Xu Lijian,Xu Jianxiong
In this study, well-defined PAA-coated NaYF4:Yb3+, Er3+ nanophosphors were synthesized via a poly(acrylic acid) (PAA) mediated hydrothermal process. The rational control of initial reaction conditions, such as hydrothermal temperature, pH value of precursor-solution,
added amount of PAA, and molecular weight of PAA ligand, resulted in upconversion of NaYF4:Yb3+, Er3+ phosphors with varying crystal phases (α and β) and morphologies (e.g., nanosphere, submicrorod, microrod, microtube, and microprism).
By assessing the upconversion luminescent properties of the synthesized NaYF4:Yb3+, Er3+ phosphors upon excitation by 980 nm infrared light, it was demonstrated that the β-phase NaYF4:Yb3+, Er3+ phosphors generally
presented stronger upconversion luminescent than α-phase NaYF4:Yb3+, Er3+ phosphors and orthorhombic phase of YF3:Yb3+, Er3+ sample. Additionally, the β-phase NaYF4:Yb3+, Er3+
phosphors with hollow microtube morphology presented higher upconversion luminescent intensity than phosphors of other morphologies. This may be due to microtubes having larger surface area (inner and outer surfaces), which promoted the absorption efficiency under similar excitation conditions,
therefore generating higher luminescent intensity. Findings form this study suggest for precisely controlled growth of other complex rare earth fluoride compounds and provide a reference for exploration of component-, phase- and morphology-dependent upconversion luminescence properties.
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Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 48
·13352-13358
·
IF 5.976
Deyin Wang,Pengpeng Zhang,Qiang Ma,Jiachi Zhang,Yuhua Wang
Submicron-sized Er3+ doped Y7O6F9 phosphors were synthesized via the precipitation method and a subsequent annealing process. The influence of the Er3+ doping concentrations and the heating temperature on the luminescence of Y7O6F9:Er3+ was investigated under the excitation of the Er3+ 4G11/2 level at 378 nm. Upon raising the Er3+ doping concentration, both the intensity and lifetime of the Er3+ green emission at 547 nm originating from 4S3/2 → 4I15/2 decrease, which is proved to be caused by energy transfer via cross relaxation between two neighboring Er3+ ions. The thermal sensing properties of Y7O6F9:Er3+ were evaluated using the temperature dependent intensity ratio between the 2H11/2–4I15/2 and 4S3/2–4I15/2 transitions of Er3+ under 378 nm excitation. The experimental results show that the thermal sensitivity decreased with an increase in the Er3+ doping content, which is caused by the increased energy transfer probability among Er3+. The increased energy transfer of Er3+ reduces the thermalized population of Er3+ in the 2H11/2 levels, which in turn decreases the thermal sensitivity. The applicability of Er3+ doped Y7O6F9 as a thermal sensor was demonstrated by measuring the chip temperature of a 1 W InGaN type near-ultraviolet light emitting diode (n-UV LED).
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 103
·期 1
·432-443
·
IF 3.094
Weirong Wang,Guanliang Yu,Ruibin Wang,Chun Jiang
Here, we select simple Er 3+ -doped tellurite glass as model system to systematically explore the up-conversion, down-shifting mechanisms with different excitations (980 and 447 nm), respectively. We observe for the first time, to the best of our knowledge that tunable photo-luminescence occurs from green to red and NIR region, rather than merely from the long-accepted green to red region. Direct evidence of selective energy transfer mechanism is expounded in detail, and its potential applications are demonstrated. In addition, we provide evidence that the cross-relaxation process between dopant ions can enhance photo-luminescence in Er 3+ doped tellurite glasses with high dopant concentrations, whereas the crucial reason for emission decrease is the energy loss long-distance energy migration. These fundamental insights into the photophysical processes in heavily doped photonic glasses will broaden the applications of rare-earth-doped materials ranging from optical communications to medical imaging.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Nianbing Zhong,Ming Chen,Haixing Chang,Tianheng Zhang,Zhengkun Wang,Xin Xin
We present a high-selectivity photochemical fiber-optic sensor in which a plastic optical fiber (POF), TiO 2 -based composite, and polymer membrane are coupled for detection of phenol concentrations in water. A thinned POF is coated with TiO 2 -based composite, which is composed of Er 3+ :YAlO 3 /SiO 2 /TiO 2 (EYST) and acts as the sensing region. The EYST coating shows good light-inducing capacity at the core–coating interface and high photocatalytic activity in the visible light region. The polymer membrane is synthesized using PEBA2533 doped with β-cyclodextrin and shows high phenol selectivity and permeability; thus, phenol molecules can freely permeate the membrane and are then transferred, become attached to the surface of TiO 2 nanoparticles, and are photocatalytically degraded. Photocatalytic degradation of phenol improves the refractive index (RI) and absorbance of the solution because of the photocatalytic byproducts; consequently, the transmitted output light intensity of the sensor changes, and the phenol concentration is accurately detected by measuring the change in the light intensity. Experimental results indicate that the prepared device detects phenol in water with high selectivity and pH independence; in phenol detection, the novel sensor shows a sensitivity of −0.195 × 10 −3 (mg/L) −1 and a low limit of detection of 40 μg/L.
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