JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Qi Wu,Mengmeng Fu,Chenzhang Gu,Yinzhen Wang,Lu Yao,Cailin Wang
Red phosphors with good thermal stability, high color temperature and color purity are critical in high power warm white LED devices. Herein, a series of single and co-doped Tb 3+ ,Eu 3+ polychromatic phosphors with pyrochlore structure based on Gd 2 Zr 2 O 7 have been prepared for the first time by a conventional solid phase reaction method. Compared to single doped Eu 3+ phosphors, Tb 3+ ,Eu 3+ co-doped phosphors possess following advantages: improved UV absorption, increased photoluminescence intensity, extended luminescence range and improved thermal stability. At room temperature, the Gd 2 Zr 2 O 7 :Tb 3+ ,Eu 3+ phosphors exhibited a gradual shift from yellow-green emission at 544 nm to orange-red emission at 613 nm with increasing doping of Eu 3+ ions. Energy transfer efficiency has been evaluated to be 71% by analyzing the fluorescence lifetime of Tb 3+ ions. The concentration quenching mechanism under different conditions was analyzed in detail and it was concluded that the quenching of Tb 3+ is caused by dipole-dipole interaction. In addition, the activation energy (ΔE a ) of the Gd 1.92 Zr 2 O 7 :0.03Tb 3+ ,0.05Eu 3+ phosphor was calculated to be as high as 0.2674 eV compared to other Tb 3+ , Eu 3+ co-doped phosphors, demonstrating its high thermal stability. WLEDs devices based on Gd 1.92 Zr 2 O 7 :0.03Tb 3+ ,0.05Eu 3+ phosphors have been prepared, which have low correlated color temperature (CCT) (5283 K), high color rendering index Ra = 85.5 K) and CIE coordinates chromaticity coordinate (0.3371,0.3333). All of the results show that Gd 2 Zr 2 O 7 :Tb 3+ ,Eu 3+ phosphors provide a new avenue to develop high quality red emission and high thermal stability phosphors for WLEDs.
研究领域:
材料科学
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光电
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光子学
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固体物理
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产品关联
DOI
高影响因子
Polymers
·
2022
·Vol. 14
·期 9
·1655
·
IF 4.967
Jun Ye,Zichang Fu,Jiawei Rao,Jian Xiong
The influences of interactions between carboxymethyl cellulose (CMC) and CMC/europium (III)–terbium (III) (CET) on the structure and properties of the resultant CMC/CET films were investigated by rheology at three stages of the film-drying process. According to the water content at different drying times, the kinetics curves during the film-drying process were drawn. Then, the rheology properties of film-forming solutions during the drying process were characterized by dynamic modulus, Han plots, zero shear complex viscosity and relaxation time. When the water content was 90%, the film contained either 0.1 or 0.2 g of CET, which had good fluidity, while the film with 0.3 g of CET was elastic-dominated. Han plots and XRD analyses showed that the interactions between the CMC and CET were not hydrogen bonds but random entanglements. The zero-shear complex viscosity and relaxation time spectrum confirmed that the entanglements enhanced as the CET content increased. Meanwhile, aggregation formed in the solution of CMC with 0.3 g of CET. When CMC-CET films with different CET additions were compared, the film with 0.2 g of CET had an even and tight sheet structure, the greatest fluorescence intensity, and superior tensile strength of 78.76 MPa.Keywords:fluorescent carboxymethyl cellulose;rheological properties;mechanical property;polymer chain
研究领域:
材料科学
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高分子化学
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流变学
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产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Zhan Ni,Mengxin Liu,Bo Li,Xinan Shi,Qiulin Cao,Daocheng Pan
LaPO4:Ce3+, Tb3+ nanoparticles with a particle size of 2.7 nm are prepared by a facile room-temperature ligand-assisted coprecipitation method in an aqueous solution. Short-chain butyric acid and butylamine are used as binary ligands and play a critically important role in the synthesis of highly luminescent LaPO4:Ce3+, Tb3+ nanoparticles. The absolute photoluminescence quantum yield as high as 74% can be achieved for extremely small LaPO4:Ce3+, Tb3+ nanoparticles with an optimal composition of La0.4PO4:Ce0.13+, Tb0.53+, which is different from La0.4PO4:Ce0.453+, Tb0.153+ for bulk phosphor. The energy transfer from Ce3+ ions to Tb3+ ions is investigated in sub-3 nm LaPO4:Ce3+, Tb3+ nanoparticles, and Ce3+ ion emission is almost completely suppressed. This room-temperature, ultrafast, and aqueous-phase synthetic strategy is particularly suitable for the large-scale preparation of highly luminescent LaPO4:Ce3+, Tb3+ nanoparticles. LaPO4:Ce3+, Tb3+ nanoparticles (110 g) can be synthesized in one batch, which is perfectly suited to the needs of industrial production.
研究领域:
材料科学
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纳米技术
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光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Ruixin Song,Sai Xu,You Li,Qun Zhang,Yuefeng Gao,Hongquan Yu,Yongze Cao,Xiangping Li,Shanpeng Zhang,Baojiu Chen
The content of Cu 2+ in lubricating oil and lubricant temperature are important indicators predicting mechanical failure. Therefore, developing a nontoxic fluorescence probe is necessary to detect Cu 2+ and temperature in lubricating oil. The lead-free inorganic double perovskite nanocrystals (NCs) Cs 2 AgInCl 6 are potential candidates. However, the low fluorescence intensity and the high excitation energy required of Cs 2 AgInCl 6 NCs limit their practical applications. In this study, Bi 3+ and Tb 3+ were successfully co-doped into Cs 2 AgInCl 6 NCs via the hot-injection method. The doping of Bi 3+ produces a broad emission originating from self-trapped excitons and reduces the excitation energy, allowing commercial LEDs as excitation sources. Tb 3+ ions doping offers characteristic emission peaks ( 5 D 0 - 7 F J ) of Tb 3+ ions and improves the fluorescence intensity of Cs 2 AgInCl 6 NCs. Furthermore, the Cs 2 AgInCl 6 : Bi 3+ /Tb 3+ NCs have been employed as optical thermometry, which provide a temperature calibration curve with the maximum absolute and relative sensitivities of 2.15% K −1 at 350 K and 2.25% K −1 at 303 K in the temperature range of 303–423 K, respectively. Finally, the nanocrystals have been applied to detect Cu 2+ in lubricating oil. The fluorescent probe shows a good detection sensitivity of 8.94 × 10 -4 nM −1 and a low detection limit of 14.3 nM in the range of 10–300 nM. This work not merely offers a novel way for improving the luminescence performances of double perovskite NCs Cs 2 AgInCl 6 , but broadens their potential for detection of Cu 2+ and temperature.
研究领域:
材料科学
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纳米技术
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分析化学
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光学传感
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2025
·
IF 4.6
Xufeng Zhou,Jianyan Ding,Wanying Geng,Quansheng Wu
The continuous progress in the development of luminescence thermometers highlights the importance of achieving high sensitivity, excellent signal resolution, and detectable emission. To tackle these challenges, the dual-emitting luminescence thermometer Ca 3 HfSi 2 O 9 :Ce 3+ , Tb 3+ was successfully designed and synthesized through a systematic approach. The crystal structure, electronic structure, luminescence properties, and thermoluminescence behavior of Ca 3 HfSi 2 O 9 singly doped with Ce 3+ or Tb 3+ , as well as co-doped with both Ce 3+ and Tb 3+ , were systematically investigated. Ca 3 HfSi 2 O 9 :Ce 3+ , Tb 3+ achieves exceptional signal resolution by leveraging the substantial energy gap (>4364 cm −1 ) between the blue light emission of Ce 3+ and the green light emission of Tb 3+ . A high relative sensitivity ranging from 1.2 %@298 K to 0.2 %@473 K is attained by exploiting the distinct temperature responses of Ce 3+ and Tb 3+ . Additionally, the weak absorption of Tb 3+ is compensated for through the sensitization effect of Ce 3+ on Tb 3+ , enabling detectable emissions under high-temperature conditions. To demonstrate its practical applicability, the luminescence thermometer was encapsulated with epoxy resin to simulate chip temperature detection, achieving a temperature error of less than 1.5 % at 448 K.
研究领域:
材料科学
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光学传感
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固体物理
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无机化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Optoelectronics Letters
·
2020
·Vol. 16
·期 5
·355-359
·
IF 0
Bian Ming-jing,Zhang Hong-yan
In this work, we studied the effect of different pH values on morphology, band gap and photoluminescence (PL) properties of Eu 3+ /Tb 3+ co-doped ZnO prepared by coprecipitation method. Experimental results show that alkaline condition is more favorable for the doping of Eu 3+ and Tb 3+ ions which reduce the band gap and increases the PL intensity of UV emission (385 nm) and visible emission (400—600 nm) of ZnO. Gaussian deconvolution PL spectra show that the defects on the surface of ZnO are decreased when it is synthesized under alkaline conditions. Furthermore, both the intrinsic orange emission of Eu 3+ ions (611 nm) and the intrinsic green emission of the Tb 3+ ions (495 nm) of ZnO in this case are obtained at the same time. High intensity green and orange emission indicates that Eu 3+ /Tb 3+ co-doped ZnO is a promising PL material and has potential in emission devices.
研究领域:
材料科学
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光电技术
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化学
✓ 已验证
产品关联
DOI
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 36
·12958-12967
·
IF 4
Jiejun Pan,Guang Xu,Sixue Ren,Tingjie Xu,Dongrui Li,Mengxin Liu,Xinan Shi,Daocheng Pan
Rare earth-doped metal oxide thin films exhibit remarkable potential for application in anti-counterfeiting, owing to their exceptional fluorescent properties. However, the existing fabrication techniques for these rare earth-doped luminescent thin films are predominantly complex and necessitate high-temperature conditions. In light of this issue, we present a low-temperature method for in situ fabrication of luminescent Ca1−xMoO4:Eux3+ and Sr1−xMoO4:Tbx3+ nanocrystal thin films by a solution deposition process. The developed method has the advantages of simple operation, rapid and low-temperature synthesis. The optimal chemical compositions of molybdate-based luminescent films are Ca0.90MoO4:Eu0.103+ and Sr0.90MoO4:Tb0.103+. Moreover, we evaluate the practical feasibility of luminescent nanoparticle films in the field of anti-counterfeiting by combining the unique fluorescent properties of rare earth ions and designing customized fluorescent patterns.
研究领域:
材料科学
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纳米技术
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光学
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防伪技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2016
·
IF 7.476
Yihui Hu,Wenjing Guo,Yubin Ding,Hanjun Cheng,Hui Wei
The detection of heparin (Hep) and its contaminant oversulfated chondroitin sulfate (OSCS) is of great importance in clinics but remains challenging. Here, we report a sensitive and selective time-resolved luminescence (TRL) biosensing system for Hep by modulating the photoluminescence of Tb 3+ with guanine-rich ssDNA and Hep-specific AG73 peptide (RKRLQVQLSIRT). With the developed system, Hep including both unfractionated Hep (UFH) and the low molecular weight Hep (LMWH) has been successfully detected with a satisfactory detection limit. Owing to the highly specific interaction between Hep and AG73 peptide, major interfering substances in Hep detection, such as Hep analogs of chondrotin sulfate (Chs) and hyaluronic acid (HA), did not interfere with Hep detection. The established TRL sensing system was then successfully used for monitoring Hep metabolism in living rats by microdialysis . Moreover, the proposed TRL sensing system was further applied to analyze OSCS contaminant in Hep with heparinases treatment by exploring the inhibition effects of OSCS on the activity of heparinases. As low as 0.002% of OSCS in Hep was identified.
研究领域:
分析化学
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生物医学工程
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药学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Optical Materials
·
2021
·Vol. 10
·期 3
·2102074
·
IF 9.926
Zi Chen,Dongdong Lu,Hangqing Xie,Xiaolei Yang,Yang Li,Chenhao Bao,Lei Lei,Shiqing Xu
The increasing demand for radiation detection in many applications has led to demanding requirements for scintillators. Realizing low-dose, pollution-free, and reliable X-ray detection has become a key technical challenge. Here, a triplet-enhanced lanthanide radioluminescence (RL) material Ga 3+ /Tb 3+ metallacrowns (Tb-1) is reported. This Tb-1 crystal emits bright green luminescence under ultraviolet light or X-ray excitation, and the emission intensity is 286 and 242 times that of Tb 3+ in inorganic salt, respectively. Tb-1 crystal is further passivated by trioctylphosphine oxide (TOPO), and the enhanced RL intensity is equivalent to that of commercial Tl-doped cesium iodide scintillator. In addition, RL of Tb-1–TOPO has an extremely narrow full width at half maximum and an excellent linear response to the X-ray dose rate. The detection limit is calculated to be 0.146 μGy s −1 , which is 38 times lower than typical medical imaging doses. Triplet-enhanced lanthanide RL provides new ideas for replacing scintillators that require high temperature synthesis processes such as inorganic phosphors and ceramics, and provides a new alternative scintillator material for flexible X-ray monitoring, bioimaging, radiotherapy, and other applications.
研究领域:
辐射检测
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材料科学
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医学成像
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 10
·1-12
·
IF 2.8
Zhao Jiaqi,Hu Chen,Fang Jiapeng,Sun Ruyi,Lu Jingyao,Su Shikun,Lei Zonghao,Fang Pengfei,Feng He,Degao Zhong,Teng Bing
In this work, a series of iso-structural eulyite-type Ba 3 Yb(PO 4 ) 3 :Tb 3+ solid solution phosphors were synthesized via high-temperature solid-phase method. The corresponding unit cell structure, luminescence properties, thermal stability, and chromaticity coordinates of the as-obtained phosphors were systematically investigated. The crystal structure of Ba 3 Yb(PO 4 ) 3 :Tb 3+ was refined by GSAS program, which indicates the oxygen ions in Ba 3 Yb(PO 4 ) 3 are disordered at one C3 site, and the oxygen atoms are distributed at two sites. Under 378 nm ultraviolet excitation, the emission peak of Ba 3 Yb(PO 4 ) 3 :Tb 3+ appears in the range of 450–650 nm, and a characteristic green emission peak appears at 542 nm. Moreover, the luminous intensity of the Ba 3 Yb(PO 4 ) 3 :14 at.% Tb 3+ sample at 160 °C is 87.7% at room temperature, and the quantum yield is 55.8%, which reveals good thermal stability. Our results suggest that the Ba 3 Yb(PO 4 ) 3 :Tb 3+ phosphors are promising high-efficiency green light conversion materials for UV-LED applications.
研究领域:
材料科学
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光电技术
·
固体化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Shengqian Wang,Junqiang Gu,Jinying Liu,Feiyan Xie,Chaochao Tao,Shuo Wang,Hualan Xu,Shengliang Zhong
Phosphors with high luminescence efficiency, tunable emission and high color rendering index (CRI) are vital importance for the quality of white light emitting diodes (w-LEDs) in real application. In this work, a new single phase color-tunable Na 5 Lu(WO 4 ) 4 :Tb 3+ ,Eu 3+ phosphor with outstanding luminescent properties was designed and synthesized. Its crystal structure, electronic structure, and luminescence features were studied in detail. The band gap of the host was calculated to be about 4.68 eV. The differential charge distribution after Tb, Eu doping through density functional theory simulation theoretically proved the electron redistribution in the W-O bond upon substitution of Tb 3+ /Eu 3+ . The energy transfer of Tb 3+ →Eu 3+ enabled tunable emission of luminescent colors from green to orange-red due to the quadrupole-quadrupole interaction. The optimal Na 5 Lu(WO 4 ) 4 :60%Tb 3+ ,20%Eu 3+ phosphor exhibited excellent photoluminescence quantum yield of 84.19 % and good luminescent thermal stability (I 423K/298K = 75.90%) with an activation energy of 0.1976 eV. Finally, a white LED device with color coordinates of (0.3371, 0.3636), color rendering index of 89.4 and correlated color temperature of 5334 K was fabricated. These findings demonstrated that Na 5 Lu(WO 4 ) 4 :60%Tb 3+ ,20%Eu 3+ phosphor could be a potential orange-red-emitting color converter for white LEDs. This work not only assisted in the understanding of experimental observations but also provided a theoretical basis for the rational design of phosphors.
研究领域:
材料科学
·
光电技术
·
光子学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 40
·19153-19160
·
IF 3.925
Zhenyu Lu,Gongke Li,Yufei Hu
A Tb3+ functionalized triazine-porous organic framework (Tb3+/TAPOF) was prepared by introducing Tb3+ into a triazine-porous organic framework through a coordination bond. Combining the advantages of both Tb3+ and TAPOF, Tb3+/TAPOF showed good thermal stability, a high specific surface area, and excellent fluorescence performance. As the concentration of ciprofloxacin became higher, the intensity of the peak at 544 nm increased, while that of the peak at 440 nm did not change. Thus, a ratiometric fluorescent sensor based on Tb3+/TAPOF for selective ciprofloxacin determination was constructed, and the mechanism of ciprofloxacin determination was studied using the UV-vis and phosphorescence spectra and fluorescence lifetime. A good linear relationship, under the optimized conditions, was obtained between the I544/I440 value and the ciprofloxacin concentration in the range of 0.06 μmol L−1 to 5.0 μmol L−1, and the limit of detection (LOD, S/N = 3) was 19 nmol L−1. Moreover, the ratiometric fluorescent sensor based on Tb3+/TAPOF was applied to the determination of ciprofloxacin in aquatic products with recoveries in the range of 96.1–108.6%. These results obtained by the ratiometric fluorescence method and the high-performance liquid chromatography (HPLC) method are consistent for determination of aquatic products, which further proves that this method based on Tb3+/TAPOF is accurate. Generally, these results demonstrate that the Tb3+/TAPOF based ratiometric fluorescent sensor has an extensive application prospect in ciprofloxacin determination in the aquatic product industry.
研究领域:
分析化学
·
食品安全
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）