OPTICAL MATERIALS
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2023
·
IF 3.9
Qijing Zheng,Chunyan Guan,Zhenghuan Wan,Ru Fu,Jinyu Yang
Pure phase orthorhombic Er 3+ and Yb 3+ co-doped La 14 W 8 O 45 up-conversion luminescent materials were successfully prepared by the hydrothermal method combined with calcination treatment. The structures, morphology, and optical properties of the samples were analyzed by X-ray powder diffractometer (XRD), scanning electron microscope (SEM), ultraviolet–visible diffuse reflectance spectroscopy (UV–Vis DRS), and up-conversion photoluminescence spectroscopy (UPL) with a 980 nm laser. XRD results indicated that the obtained samples are single-phase orthorhombic Er 3+ and Yb 3+ co-doped La 14 W 8 O 45 crystals. SEM results showed that the prepared sample exhibits an irregular and melted polyhedral-like morphology with agglomeration in submicron size of particles approximately 50–200 nm. UV–vis DRS results revealed that the La 14 W 8 O 45 crystal is a direct semiconductor with an optical band gap of 3.84 eV. The prepared Er 3+ and Yb 3+ co-doped La 14 W 8 O 45 crystals exhibit strong up-conversion emission peaks at about 526 nm, 548 nm, and 660 nm under 980 nm laser excitation. The intensity of up-conversion luminescence is affected by the Er 3+ doping concentration, and concentration quenching will be observed due to the cross-relaxation (CR) process when the Er 3+ doping content is above 1%. The pumping power dependence of the luminescence indicated that the up-conversion emissions of samples are excited by a two-photon absorption process. The color coordinates of the samples are located in the green light region.
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高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Yan Yang,Yawen Deng,Li Zhang,Yaru He,Shuai Zhao,Ting Xiao,Suihu Dang,Yunfeng Bai
Er 3+ /Li + co-doped Y 2 O 3 nanocrystals were synthesized by the sol-gel method. Fluorescence intensity has been enhanced about 270 times under 980 nm laser excitation by combined laser annealing (90 times) and co-doped with Li + ions (3 times). The doping of Li + ions increased the asymmetry around Er 3+ , while laser annealing reduced surface defects . Fluorescence characteristics with the temperature of laser annealed Er 3+ /Li + co-doped Y 2 O 3 nanocrystals were studied. An interesting phenomenon that the non-thermal coupling of I 563 /I 799 transformed into the thermal coupling as the temperature rises is found. The possible mechanisms were discussed, and fluorescence thermometry based on I 563 /I 799 showed higher temperature sensitivity than other reports. The effective fluorescence enhancement method and the new fluorescence thermometry energy levels can promote the application of rare earth fluorescent materials.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Hao Ren,Shoujun Ding,Hongyuan Li,Wenpeng Liu,Yong Zou,Yufeng Han,Qingli Zhang
Upconversion luminescent materials exhibit excellent near-infrared to visible conversion properties that make them crucial for optoelectronics , visible display devices, and biological labels. Herein, we report a high-quality Yb 3+ and Er 3+ co-doped Gd 3 Sc 2 Al 3 O 12 ( GSAG) single crystal which was grown successfully by the traditional Czochralski method with Er 3+ and Yb 3+ doping concentration of 1 at.% and 10 at.%, respectively. The structure parameters of the crystal were observed by the X-ray Rietveld refinement method. In addition, the transmission and upconversion emission properties of the crystal were analyzed at room temperature . The 940 nm excited upconversion energy transfer mechanism and dependence of the green-to-red upconversion intensity ratio ( I g/r ) on pump power were investigated. A dominant two-photon absorption process of the green and red upconversion emission bands were revealed in Yb,Er:GSAG crystal. The results indicate the crystal is a promising upconversion single crystalline material.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2021
·
IF 10.588
Yijin Qiu,Jianjiang Lu,Yujun Yan,Junfeng Niu
The widespread use of antibiotics in drug therapy and agriculture has seriously polluted the aquatic environment. Bismuth tungstate (Bi 2 WO 6 ) is a new and efficient visible-light catalyst that is simple to prepare, non-toxic, stable, and corrosion resistant. Nonetheless, its efficiency has remained limited, and erbium (Er) mixing has been tested to address this. Here, a new Er 3+ -mixed Bi 2 WO 6 photocatalyst was successfully prepared through the one-step hydrothermal method; pigments were characterized via XRD , SEM, BET, XPS, Uv-vis, PL and EIS. The results showed that the 16% Er 3+ -Bi 2 WO 6 photocatalyst is a 250 nm flower-like nanosheet with a specific surface area of 67.1 m 2 /g and bandgap (Eg) of 2.35 eV, which provides the basis for superior performance. When the concentration of the catalyst was 0.4 g/L, 94.58% of the tetracycline (TC) solution (initial concentration of 10 mg/L) degraded within 60 min under visible light irradiation (λ ≥ 420 nm). ESR and LC-MS were used to identify the free radicals and intermediates for the degradation of TC pollutants; a photocatalytic degradation system and pathway were proposed. This solar-driven system will ultimately reduce resource consumption, providing a sustainable and energy-saving environmental decontamination strategy.
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Xin Chen,Linwen Jiang,Luhui Zhou,Mingyu He,Jiangtao Li,Anhua Wu,Hongbing Chen
The Er 3+ @Yb 3+ co-doped SrAl 2 B 2 O 7 phosphors were prepared by a sol-gel auto-combustion method. The components, microstructure and up-conversion (UC) properties of samples were investigated systematically. The phosphors emitted red light and green light under the excitation of 980 nm wavelength. The intensity of red emission and green emission nearly linearly decreased with increasing ambient temperatures. The red emission, green emission and their intensity ratio as a function of Er 3+ concentrations and Yb 3+ concentrations were studied in detail. The results show that 4.0% Er 3+ and 8.0% Yb 3+ doped samples can obtain the best luminescence intensity while the best light purity cannot be obtained simultaneously. The intensity of red and green emission was measured as a function of excitation power. It indicates that there was no photon avalanche mechanism for SrAl 2 B 2 O 7 : Er 3+ @Yb 3+ due to the absence of sharp change of n values. The UC luminescence corresponded to a two-photon absorption process which was illustrated by the energy transfer mechanism and the steady-state rate equations. Because of the controllable monochromatic luminescence and excellent temperature-dependent luminescence properties, the SrAl 2 B 2 O 7 : Er 3+ @Yb 3+ phosphors have potential application in the fields of non-contact temperature measurement and bio-polychromatic label.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Jiaqiang Liu,Weiling Huang,Zhiguo Xia,Yan Xu
Non-contact thermometry operating at the sub-micrometer level based on self-referencing upconversion (UC) micro-nanomaterial is an attractive pursuit for optical thermometers. Here, a novel accordion-like Y 2 O 3 :Er 3+ nanothermometer with green/red UC luminescence is obtained from the solvent-free grinding and the following temperature-programmed calcination of the Er 3+ -doped Y-containing metal-organic framework (MOF) precursor. Upon 980 nm laser irradiation, the as-prepared Y 2 O 3 :Er 3+ exhibits dual-emitting green and red emissions originating from Er 3+ ions with a two-photon UC process, and the intensities are strongly dependent on temperature. The optical thermometry behaviours of Y 2 O 3 :Er 3+ nanothermometer using the fluorescence intensity ratio (FIR) technique are studied in the temperature range of 298–393 K within the physiological temperature, in which the thermally coupled levels of two green emissions and another pair of coupled levels with red and green emissions are comparatively investigated. A relative large calculated energy gap Δ E (951 cm −1 ) for the thermally couple levels of 2 H 11/2 and 4 S 3/2 and a maximum absolute sensitivity ( S a ) of 0.0027 K −1 at 393 K are determined, respectively. This novel accordion-like Y 2 O 3 :Er 3+ nanothermometer exhibits excellent optical sensing stability and high temperature resolution, demonstrating its great potential as reliable and promising optical thermometers.
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高影响因子
Materials Today Chemistry
·
2025
·
IF 6.7
Jia Yu,Ruipeng Chai,Yuanyuan Hu,Xue Yang,Hong Xin,Xiangyu Zhang,Dangli Gao
Persistent luminescence (PersL) materials have emerged as an outstanding optical media with versatile applications in data storage, anti-counterfeiting, and beyond. However, their practical implementation is critically hindered by insufficient PersL intensity, a challenge fundamentally rooted in the incomplete understanding of trapping mechanisms. Here, we developed Tb 3+ -activated Ga 4 GeO 8 phosphors with rational defect manipulation via Ln 3+ (Ln = Pr, Eu, Ce, Er) co-doping strategies. Especially, when Eu 3+ /Er 3+ are introduced as lattice distortion agents into Tb 3+ -doped Ga 4 GeO 8 , the phosphors demonstrate dual-band PersL including blue-green PersL from Tb 3+ 5 D 4 → 7 F J transitions (492–620 nm) and red-NIR PersL emission (715 nm) originating from oxygen defect levels. Through systematic exploration of the PersL mechanism, we propose a criterion for effective trapping: stabilizing V O •• defect energy levels by replacing matrix cations with less electronegative species (e.g., Eu 3+ , Er 3+ ), which suppresses non-radiative V O defect states. This study establishes design guidelines for the rational development of high-performance PersL materials.
研究领域:
材料科学
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光学材料
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固体物理
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无机化学
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发光学
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高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Yuanjie Teng,Jie Li,Yantao Lou,Xingchen Zhang,Ze Wang,Naiwen Zhang,V. Balasubramani,Tianyu Hu,Zaifa Pan
Surface-enhanced Raman scattering (SERS) offers single-molecule sensitivity, but its practical use is constrained by the high cost and instability of noble-metal substrates. Semiconductor based SERS substrates are more stable and scalable, but typically suffer from weak charge transfer due to wide band gaps. Here we report a rare-earth doping strategy to boost the SERS activity of wide-band-gap ZnO. By introducing Er3+ with multielectron 4f orbitals into Zn1−xErxO (x = 0–8 mol%), the carrier density was simultaneously increased and new defect states were created that collaboratively enhance electromagnetic and chemical contributions. The optimized Er3+-doped ZnO substrate enables sensitive and reproducible detection of rhodamine 6G, achieving a detection limit of 2.4 × 10−8 M, an enhancement factor of 1.73 × 105, and excellent uniformity (RSD = 1.39%). Mott–Schottky analysis confirms carrier density increase upon Er doping, while DFT calculations attribute the dominant contribution to Er d-states and the introduction of 4f-induced surface defect levels that promote charge transfer. This work establishes rare-earth doping as an effective route to engineer semiconductor based SERS substrates and offers a mechanistic framework for designing non-metal SERS systems with synergistic electromagnetic and chemical enhancement.
研究领域:
材料科学
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分析化学
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纳米科技
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半导体物理
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光谱学
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高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Wei Zhang,Xiaona Zhang,Yu Zhou,Ying Zhang
Mesoporous bioactive glasses have great potential for applications in the field of bone tissue repair due to their excellent biological properties, but effective information on the repair process is not available in a timely manner. Thus, real-time monitoring of mineralization and drug release processes will be beneficial to obtain the degree of healing and optimize the amount and distribution of drugs to improve targeted therapeutic effects. Here, erbium-doped mesoporous bioactive glass microspheres (Er/MBGs) were successfully synthesized by the sol-gel method, and the doping concentration of erbium was selected based on fluorescence, BET, and bioactivity tests. The results showed that 4Er/MBGs not only had the highest luminescence emission, higher specific surface area (418.8 m 2 /g) and mesopore volume (0.42 cm 3 /g) but also presented excellent bioactivity. Therefore, 4Er/MBGs were selected for in vitro real-time monitoring of mineralization and drug release. It has been shown that the luminescence intensity of 4Er/MBGs is linearly related to its mineralization degree; As the degree of mineralization increases in vitro , the intensity of the luminescence emission gradually decreases. The results of in vitro drug release monitoring experiments showed that 4Er/MBGs loaded with the anticancer drug doxorubicin (DOX) exhibited great pH responsiveness, and the loaded DOX selectively quenched the green emission of the microspheres. When the drug was released, the green emission recovered stably, and the signal value of the ratio R ( I 650 nm/ I 510 nm) of the emission intensity of the red to the green of the microspheres gradually decreased. Monitoring changes in the value of the R signal is instructive for tracking the drug release process. Meanwhile, in vitro antibacterial experiments indicated that 4Er/MBGs had a strong inhibitory effect on E. coli and S. aureus , with antibacterial rates of up to 92.5% and 90.7%, respectively. Collectively, Er/MBGs have potential applications as optically functional materials in bone tissue engineering.
研究领域:
生物材料学
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骨组织工程
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高影响因子
Laser & Photonics Reviews
·
2014
·Vol. 8
·期 4
·575-582
·
IF 9.313
Wu Suli,Liu Ye,Chang Jie,Ning Yanhui,Zhang Shufen
Upconversion emission intensity and morphology are both important features of NaYF 4 :Yb 3+ , Er 3+ microcrystals. In this paper, myristic acid (MA) is selected as a novel stabilizing ligand to synthesize NaYF 4 :Yb 3+ , Er 3+ through a facile hydrothermal method. Upconversion fluorescence spectra indicate that the emission intensity of product prepared with MA as ligand has increased dramatically compared with the sample prepared using commonly used oleic acid (OA) as ligand. Field emission scanning electron microscopy (FE-SEM) results display that the morphology of NaYF 4 :Yb 3+ , Er 3+ obtained using MA as ligand can be tuned from nanodisk, nanorod to nanotube. Especially, nanotube with clear caves can be prepared directly with proper concentration of base (NaOH). And powder X-ray diffraction (XRD) analysis reveals a relationship between the phase transformation process and the amount of NaOH. With increasing the amount of NaOH, the transition process of cubic phase to hexagonal phase is accelerated. The effect of F − and OH − on the fluorescence properties of NaYF 4 :Yb 3+ , Er 3+ are studied systematically. A gradual increase of the amount of NaF results in a regular increase of the emission intensity. On the contrary, the emission intensity decreases with increasing the amount of NaOH. In addition, reasonable explanations of the influence of F − and OH − on emission intensity are given as well.
研究领域:
材料科学
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光学
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高影响因子
JOURNAL OF LUMINESCENCE
·
2019
·
IF 2.961
Hao Lin,Dekang Xu,Yongjin Li,Lu Yao,Liqin Xu,Ying Ma,Shenghong Yang,Yueli Zhang
Lanthanide-doped upconversion (UC) materials are commonly excited by 700–1000 nm laser because of Yb 3+ (980 nm excitation) and Nd 3+ (808 nm excitation) are typically used as sensitizers. However, the excitation band located in the second near-infrared window (NIR-II, 1000–1700 nm) demonstrates the deeper penetration in biological tissue with minimum tissue scattering and autofluorescence. Herein, intense red UC emission in Er 3+ -sensitized NaLuF 4 particles under 1532 nm NIR-II excitation is presented. Red UC luminescence is significantly enhanced and purified through confining the 1532 nm excitation energy by Ho 3+ and Tm 3+ mediators, via an energy back transfer pathway (Er 3+ → Ho 3+ → Er 3+ and Er 3+ → Tm 3+ → Er 3+ ). Furthermore, when the particles injected into the fresh beef, red UC luminescence can be distinctly observed from the inside of beef under 1532 nm NIR-II excitation, implying the deep penetration of 1532 nm NIR-II excitation and 660 nm red UC emission. Our results suggest that bright red UC luminescence from Er 3+ -sensitized NaLuF 4 crystals with 1532 nm NIR-II excitation may be suitable for deep optical imaging .
研究领域:
材料科学
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生物医学工程
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光学成像
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纳米医学
·
分子影像
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高影响因子
ACS Applied Energy Materials
·
2018
·
IF 0
De-Yin Wang,Peng-Cheng Ma,Jia-Chi Zhang,Yu-Hua Wang
Samples of Er3+–Yb3+ co-doped Y7O6F9 are synthesized by solid state reaction method, and their down- and up-conversion luminescence are studied. Upon excitation into the 4F7/2 level of Er3+ at 490 nm, effective energy transfer from Er3+ to Yb3+ via cross-relaxation Er3+ (4S3/2) + Yb3+ (2F7/2) → Er3+ (4I13/2) + Yb3+ (2F5/2) occurs, splitting an absorbed high-energy photon (λ = 490 nm) into two photons (λ = 1000 and 1540 nm). Based on the changing of the lifetime of Er3+4S3/2 → 4I15/2 emission without and with Yb3+, the efficiency of Er3+ → Yb3+ energy transfer in Y7O6F9:1%Er3+,9%Yb3+ has been evaluated to 58%. Upon excitation at 980 nm, as the Yb3+ doping concentration increases, not only an overall increase in intensity but also an enhancement of the red (4F9/2 → 4I15/2) emission with respect to the green (4S3/2 → 4I15/2) emission were observed. Under 980 nm laser excitation with power of 20 mW, the overall integrated emission intensity in the 500–700 nm of Y7O6F9:1%Er3+,5%Yb3+ is 1.8 times higher than that of β-NaYF4:2%Er3+,18%Yb3+ that is to date the most efficient up-conversion phosphor. In view of the efficient down-/up-conversion in Er3+-Yb3+ co-doped Y7O6F9, this material is expected to be used to enhance the efficiency of solar cells.
研究领域:
材料科学
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光子学
·
可再生能源
·
发光材料
·
太阳能电池
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