CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Wei Li,Nan Ma,Balaji Devakumar,Xiaoyong Huang
In this work, novel highly efficient cyan-emitting Ce 3+ -activated CaLu 2 HfGaAl 3 O 12 (abbreviated as CLHGAO) garnet-structured phosphors were synthesized using the high-temperature solid-state reaction route. Rietveld refinement results demonstrate the as-prepared samples belong to cubic space group Ia 3 ‾ d . These CLHGAO: x Ce 3+ ( x = 0.5–8%) phosphors possessed a broad absorption band in the 320–450 nm wavelength range with a maximum at 408 nm. Upon 408 nm excitation, the CLHGAO:0.5%Ce 3+ sample showed a broad cyan emission band within 425–750 nm wavelength range (emission peak: 493 nm; bandwidth: 95 nm), along with CIE color coordinates of (0.1939, 0.3533) and a high internal quantum efficiency of 81.9%. It is observed that, with increasing Ce 3+ doping concentration from 0.5% to 8%, the emission peak position of CLHGAO: x Ce 3+ moves from 493 nm to 527 nm, and the corresponding emission color changes from cyan to green. Besides, the thermal stability and color stability of CLHGAO:0.5%Ce 3+ phosphor at high temperature are also studied. A white LED device was fabricated by utilizing a 395 nm LED chip with as-prepared CLHGAO:0.5%Ce 3+ cyan-emitting phosphor and commercial (Ba,Sr) 2 SiO 4 :Eu 2+ green-emitting phosphor and commercial CaAlSiN 3 :Eu 2+ red-emitting phosphor, and it demonstrates a high-color-quality white light with high color rendering index of 91, low color correlated temperature of 3547 K and good luminous efficacy of 58.71 lmW −1 .
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Weiyi Lu,Shuyan Lou,Bin Yang,Meixuan Wu,Huimin Hao,Zihua Guo
The convenient monitoring of carbaryl is necessary because of its serious threat to environment and public health. In enzyme inhibition-based colorimetric detection, the oxidation of colorimetric substrate (3,3′,5,5′-tetramethyl benzidine) only proceeds at pH below 5, while most enzymes only work efficiently at neutral pH. Here fluorescein was doped in coordination polymers to serve as novel nanozymes for efficient light-activated oxidation. The long triplet state lifetime of Ce 3+ made the substrate oxidize at neutral pH to overcome a pH limitation. Furthermore, one interesting light-activated biosensing system was developed based on the carbaryl’s unique toxicity towards acetylcholinesterase. It can sensitively detect carbaryl at neutral pH with a limit of detection 1.53 μg/L, which is much lower than the maximum residue limit (50 μg/L) in European Union database. It also enjoys a good selectivity for carbaryl detection over other pesticides or endocrine disruptors . Besides, the biosensing system showed a satisfied performance to detect carbaryl in both water and food samples.
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高影响因子
BIOMACROMOLECULES
·
2023
·
IF 6.2
Tao Wang,Haowei Fang,Subate Yalikun,Jinyan Li,Yuqing Pan,Kunxi Zhang,Jingbo Yin,Haiyan Cui
Developing strong anti-inflammatory wound dressings is of great significance for protecting inflammatory cutaneous wounds and promoting wound healing. The present study develops a nanocomposite Pluronic F127 (F127)-based hydrogel dressing with injectable, tissue adhesive, and anti-inflammatory performance. Briefly, Ce3+/tannic acid/ulinastatin nanoparticles (Ce3+/TA/UTI NPs) are fabricated. Meanwhile, α-lipoic acid is bonded to the ends of F127 to prepare F127-lipoic acid (F127LA) and its nanomicelles. Due to the gradual viscosity change instead of mutation during phase transition, the mixed Ce3+/TA/UTI NPs and F127LA nanomicelles show well-performed injectability at 37 °C and can form a semisolid composite nanohydrogel that can tightly attach to the skin at 37 °C. Furthermore, ultraviolet (UV) irradiation without a photoinitiator transforms the semisolid hydrogel into a solid hydrogel with well-performed elasticity and toughness. The UV-cured composite nanohydrogel acts as a bioadhesive that can firmly adhere to tissues. Due to the limited swelling property, the hydrogel can firmly adhere to tissues in a wet environment, which can seal wounds and provide a reliable physical barrier for the wounds. Ce3+/TA/UTI NPs in the hydrogel exhibit lipopolysaccharide (LPS)-scavenging ability and reactive oxygen species (ROS)-scavenging ability and significantly reduce the expression of inflammatory factors in wounds at the early stage, accelerating LPS-induced wound healing.
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PubMed
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2020
·Vol. 96
·期 3
·753-762
·
IF 2.008
Zhu Rui,Bi Zun,Jia Ke,Liu Yunfei,Lyu Yinong
A series of single-component ScF 3 :Dy 3+ , Eu 3+ , Ce 3+ phosphors prepared by means of microwave hydrothermal method were explored for light-emitting diodes. The as-prepared samples were characterized via X-ray diffraction (XRD), scanning electron microscope (SEM), and photoluminescence (PL) spectroscopy. In order to rationalize the experimental results, first-principle calculations based on density functional theory had been carried out to discover electronic structures. PL performance of the RE 3+ -doped phosphors exhibited well-defined bands in the visible region. By adjusting the ratios of Ce/Dy/Eu, the color of the as-prepared phosphors can vary from blue (0.24, 0.23) to red (0.51, 0.30) across the white (0.34, 0.26) region according to the chromaticity coordinates. The results suggested that the Dy/Eu/Ce-doped ScF 3 might act as down-convert phosphors for near ultraviolet light-emitting diodes, especially for white LEDs. What is more, it can also promote a deep comperhension of the relationship between structure and properties in ScF 3 -based phosphors.
ScF 3 :RE 3+ phosphors with alterable bandgaps can emit light from blue to orange–red across white under the excitation of near ultraviolet light. Introduction of rare earth ions induced the variation of energy band structures in ScF 3 -based phosphors because of the existence of f , p , and d orbits in RE 3+ , therein f and p orbits of RE 3+ made the band structure downwards, the p hybridizing with Sc-3 d promoted the band toward high-energy region.
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JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Bingxin Xie,Lei Lei,Enyang Liu,Gongxun Bai,Renguang Ye,Shiqing Xu
Novel blue LED excitable Ce 3+ -doped alkaline-earth sulfide nanocrystals are exploited for selective and sensitive Fe 3+ ions sensing in this work. The detection limit is calculated to be as low as 92.5 nM, which is better than most previous ultra-violet light excited fluorescence probes. The decreased radiative probability of the Ce 3+ : 5d by the NC surface environmental variation activates the sensing capability.
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TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2020
·
IF 2.615
Yin CHEN,Shao-wen XIE,Chao TONG,Hai-hu TAN,Li-jian XU,Na LI,Jian-xiong XU
Novel hydrophilic NaYF 4 :Yb 3+ ,Tm 3+ @NaGdF 4 :Ce 3+ ,Eu 3+ double-jacket microtubes (DJMTs) with upconversion/ downconversion dual-mode luminescence were designed and prepared through epitaxial growth of NaGdF 4 :Ce 3+ , Eu 3+ shell onto the NaYF 4 :Yb 3+ ,Tm 3+ microtube via poly(acrylic acid) (PAA) mediated hydrothermal method. It is demonstrated that PAA ligand played an important role in guiding the direct growth of NaGdF 4 :Ce 3+ ,Eu 3+ shell onto the surface of NaYF 4 :Yb 3+ ,Tm 3+ parent microtubes. The growth of NaGdF 4 :Ce 3+ ,Eu 3+ shell experienced a crystal phase transition from β -NaGdF 4 and β -NaYF 4 mixture to β -NaYF 4 @NaGdF 4 composite crystal, and morphology evolution from mixture of β -NaGdF 4 :Ce 3+ ,Eu 3+ nanorods and β -NaYF 4 :Yb 3+ ,Tm 3+ microtubes to NaYF 4 :Yb 3+ ,Tm 3+ @NaGdF 4 : Ce 3+ ,Eu 3+ DJMTs. The formation mechanism of DJMTs was the dissolution−renucleation of β -NaGdF 4 :Ce 3+ ,Eu 3+ nanorods and the growth of β -NaGdF 4 :Ce 3+ ,Eu 3+ shell via the classical Ostwald ripening mechanism. The as-prepared DJMTs could exhibit blue upconversion and red downconversion luminescence, which was further made into environmentally benign luminescent inks for creating highly secured and fluorescent-based anti-counterfeiting patterns via inkjet printing.
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高影响因子
APPLIED CLAY SCIENCE
·
2019
·
IF 3.89
Minhong Xu,Guoxiang Pan,Yue Meng,Yuhua Guo,Tao Wu,Haifeng Chen
MgAlCe ternary hydrotalcites-like compounds (MgAlCe-HTlc) with different Al 3+ /Ce 3+ molar ratio were synthesized by co-precipitation method. In addition, MAlCe-HTlc (M: Co, Ni, Zn) with Al 3+ /Ce 3+ molar ratio 0.95: 0.05 were also synthesized. The attained LDH were characterized by SEM, EDX, XRD, FT-IR, TG-DTA, XPS and UV-Vis DRS techniques. The results indicated that the synthesized MgAlCe-HTlc appeared to be the typical layered structure when it contains Al 3+ and Ce 3+ ions simultaneously. Three kinds of attained MAlCe-HTlc also had typical layered structure of LDH. Furthermore, the thermal stability of MgAlCe-HTlc decreased by the substitution of Ce 3+ for Al 3+ ions. When Mg 2+ was replaced by Co 2+ , Ni 2+ or Zn 2+ , the decomposition temperatures reduced. The Ce 3d spectrum of Mg 3 Al 0.8 Ce 0.2 -HTlc before and after used indicated presence of mixed valence states of Ce 3+ and Ce 4+ . The MgAlCe-HTlc exhibited a relatively high degradation capacity for methylene blue (MB), while degradation ability of Mg 3 Al 0.95 Ce 0.05 -HTlc/H 2 O 2 was highest. The remaining rate of the MB was about 6.46% after irradiation for 80 min. The order of degradation effects about MB was as follow: MgAlCe-HTlc>ZnAlCe-HTlc>CoAlCe-HTlc≈NiAlCe-HTlc. In addition, the effects of different parameters such as pH of the solution, catalyst type and dosage, concentration of MB, as well as the stability of catalyst were investigated. The photocatalytic degradation mechanism of MB showed that the OH, h + and superoxide anion produced in Mg 3 Al 0.95 Ce 0.05 -HTlc/H 2 O 2 system were all active species , while OH played a major role.
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高影响因子
MATERIALS RESEARCH BULLETIN
·
2017
·
IF 2.446
Chunlong Han,Li Luo,Guoshuai Dong,Wei Zhang,Yinhai Wang
Novel YAG:Ce 3+ , Pr 3+ , Yb 3+ phosphors were synthesized using a high temperature solid state reaction method. The XRD patterns revealed that the obtained samples belong to the single phase YAG. The optical spectra demonstrated that Pr 3+ could be a bridge to facilitate the energy transfer from Ce 3+ to Yb 3+ in the YAG host. Blue light excited Ce 3+ and a yellow emission from Ce 3+ together with a near infrared emission of Yb 3+ was obtained. The effect of Pr 3+ doping on the energy transfer efficiency was explored. When the doping concentration of Pr 3+ increased, the yellow emission intensities of Ce 3+ decreased and the near infrared emission intensity of Yb 3+ increased monotonously. Hence, the efficiency of energy transfer from Ce 3+ to Yb 3+ is enhanced by the addition of Pr 3+ , implying that the YAG:Ce 3+ , Pr 3+ , Yb 3+ phosphors are promising downshifting materials and have the potential to be used in Si-based solar cells.
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高影响因子
Advanced Optical Materials
·
2024
·
IF 8
Min Zhang,Peipei Dang,Yujia Wan,Yingsheng Wang,Zixun Zeng,Dongjie Liu,Qianqian Zhang,Guogang Li,Jun Lin
Visible-to-near-infrared (VIS-NIR) luminescent materials are in great demand in the field of non-destructive testing such as component determination and hyperspectral imaging. Although Cr 3+ -activated phosphors are widely reported, controllable tailoring ultra-wide VIS-NIR luminescence excited by blue light is still a challenge. The strategies of cationic substitution and energy transfers are effective for adjusting the luminescence of Cr 3+ -activated phosphors. In this work, a series of Cr 3+ -doped Sc-based solid solution phosphors (Ba 3-m Sr m Sc 4 O 9 :Cr 3+ ) are reported. Under the excitation of blue light, these phosphors exhibit broadband emission due to the different luminescence centers induced by Cr 3+ occupying different cationic sites. Because of the weaker crystal field strength, Cr 3+ realizes a broadband emission with a longer peak position (λ em = 820 nm) and broader full width at half maximum (FWHM≈182 nm) in Ba 2 SrSc 4 O 9 . Furthermore, Ce 3+ /Yb 3+ ions are introduced into Ba 2 SrSc 4 O 9 :Cr 3+ , achieving an ultra-wide VIS-NIR luminescence (460–1200 nm) by the Ce 3+ →Cr 3+ →Yb 3+ multiple energy transfers. Designing energy transfers is beneficial to improve the quantum efficiency and weaken the thermal quenching. Finally, the NIR phosphor-converted light-emitting diode (pc-LED) fabricated by Ba 2 SrSc 4 O 9 :Cr 3+ demonstrates great potential in night-vision and water component detection. This work provides an effective design idea for controllable tailoring ultra-wide VIS-NIR luminescence by chemical substitution and energy transfer.
研究领域:
材料科学
·
光学
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高影响因子
DALTON TRANSACTIONS
·
2013
·Vol. 42
·期 27
·9852-9861
·
IF 3.806
Yuan Wu,Dongmei Yang,Xiaojiao Kang,Ping'an Ma,Shanshan Huang,Yang Zhang,Chunxia Li,Jun Lin
Multifunctional nanocomposites integrating mesoporous and luminescence properties into a single entity are synthesized via a facile and effective approach. Oleic acid capped β-NaYF4:Ce3+/Tb3+ nanoparticles (NPs) are transferred into aqueous solution by cetyltrimethylammonium bromide (CTAB) surfactants, and further encapsulated with uniform mesoporous silica shell followed by the surface modification with poly(ethylene glycol) (PEG), leading to the formation of water-dispersible and biocompatible core–shell structured β-NaYF4:Ce3+/Tb3+@mSiO2-PEG (denoted as NPs@mSiO2-PEG) nanospheres. The as-synthesized nanospheres show a typical mesoporous structure and a green emission under UV irradiation. Doxorubicin hydrochloride (DOX), a widely used anti-cancer drug, is used as a model drug to evaluate the loading and controlled release behaviors of the NPs@mSiO2-PEG in phosphoric acidic buffer solutions (PBS) at different pH values (pH = 7.4 and 5.0). The composite carriers provide a pH-sensitive drug release pattern and the drug releases faster under lower pH value. The endocytosis process of fluorescein isothiocyanate (FITC)-labelled nanospheres is characterized using flow cytometry and confocal laser scanning microscopy (CLSM) against A549 cells. The in vitro cytotoxic effect against A549 cells of the DOX-loaded carriers is investigated in detail. In addition, the extent of drug release can be monitored by the variation of photoluminescence (PL) intensity of β-NaYF4:Ce3+/Tb3+. Considering the good biocompatibility and pH-dependent drug release pattern, such core–shell structured luminescent NPs@mSiO2-PEG nanospheres have potential applications in controlled drug delivery.
研究领域:
生物材料
·
纳米医学
·
肿瘤学
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PubMed
高影响因子
JOURNAL OF RARE EARTHS
·
2026
·
IF 9.6
Cuiping He,Chang Liu,Jingxing Cao,Jixin Sun,Yuning Zhang,Jie Liu,Zhanchao Wu
In this work, a tunable white light-emitting Ba 2.96–2 x K x Ce x P 4 O 13 :0.04Eu 2+ ( x = 0.00–0.16) phosphor was synthesized via solid-state reactions. The phosphor phase selection depends on Ce 3+ doping concentration in Ba 3 P 4 O 13 host. Under 340 nm excitation, Ba 2.96 P 4 O 13 :0.04Eu 2+ phosphor exhibits a broad asymmetric cyan emission centered around 450 nm in the absence of Ce 3+ doping. However, when Ce 3+ ions are introduced, the emission spectrum of Ba 2.96 P 4 O 13 :0.04Eu 2+ phosphor becomes broader and the maximum emission peak shifts to 550 nm. This phenomenon is attributed to the phase transition of Ba 2.96 P 4 O 13 :0.04Eu 2+ from low-temperature phase to high-temperature phase. Temperature-dependent photoluminescence measurements reveal that low-temperature phase phosphors exhibit superior thermal stability compared to high-temperature phase phosphors. Eventually, a white light-emitting diode device was fabricated by combining the Ba 2.64 Ce 0.16 K 0.16 P 4 O 13 :0.04Eu 2+ phosphors with 365 nm light-emitting diode (LED) chip, which exhibits a high color rendering index of 91.61 and a low correlated color temperature of 4230 K. As reported, white-emitting Eu 2+ and Ce 3+ co-doped phosphors have potential applications in solid-state lighting. The crystal-phase engineering approach provides a guide for optimizing and designing novel single composition white-emitting phosphor materials.
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JOURNAL OF LUMINESCENCE
·
2026
·
IF 3.8
Liang Yang,Jianwei Dao,Zihao Han,Zhihao Jiang,Yajie Deng,Taiping Han
Traditional white light-emitting diodes (LEDs) frequently exhibit cyan-gap deficiency, resulting in unbalanced emission spectrum that impedes the realization of full-spectrum lighting. Herein, a novel Ce 3+ -doped garnet phosphor CaY 2 HfAl 4 O 12 (CYHAO:Ce 3+ ) was successfully synthesized via a high-temperature solid-state reaction method. The crystal structure, luminescent properties, thermal stability, and WLED application performance of the phosphor were systematically investigated. X-ray diffraction (XRD) and Rietveld refinement results confirm that CYHAO:Ce 3+ crystallizes in a cubic garnet structure with space group Ia-3d. Under 446 nm blue light excitation, CYHAO:Ce 3+ exhibits a broad cyan emission band centered at ∼505 nm, which perfectly fills the cyan-gap of traditional WLEDs. The optimal Ce 3+ doping concentration is determined to be 0.02 mol. Concentration quenching mainly resulted from radiation reabsorption and electric dipole-electric dipole interactions. This phosphor exhibited strong thermal stability, retaining ∼73% of initial emission intensity at 423 K with an activation energy of 0.31eV. A WLED device fabricated by combining it with commercial CaAlSiN 3 :Eu 2+ phosphors and a 450 nm blue chip emitted warm white light with an excellent color rendering index (Ra = 92.8, R9 = 93.9, R15 = 91.7) and a correlated color temperature of 3507 K. These results demonstrate that CYHAO:Ce 3+ is a promising cyan phosphor for high-quality full-spectrum WLEDs with excellent color rendering performance.
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