Laser & Photonics Reviews
·
2024
·Vol. 18
·期 11
·2400283
·
IF 9.8
Xuexia Chen,Ran Pang,Shangwei Wang,Tao Tan,Jiangyue Su,Weihong Yuan,Su Zhang,Hongjie Zhang
Traditional anti-counterfeiting luminescent phosphors are usually composed of single-mode photoluminescence materials, which greatly limits the security of encryption by its static fluorescent pattern. Herein, multi-mode luminescence properties are achieved including fluorescence and persistent luminescence (PersL) within single host by co-doping Bi 3+ and Eu 3+ in CaNaSb 2 O 6 F (CNSOF). A tunable emission is observed from blue (Bi 3+ , 3 P 1 → 1 S 0 ) to white and then to orange-yellow (Eu 3+ , 5 D 1 → 7 F 2 and 5 D 0 → 7 F 0, 1, 2, 3, 4 ) as the excitation schemes, environment temperatures and doping level are modulated. Impressively, the blue emission attributed to the Bi 3+ rapidly disappears after stopping the excitation light irradiation, and only the intense orange-yellow PersL produced by Eu 3+ can be observed. And a possible model for the energy transfer and PersL mechanism is proposed by the investigation crystal structure and photoluminescence/PersL. A schematic of security logo and digital information encryption is demonstrated using the prepared samples, which shows the dynamic evolution of the emission color and PersL brightness. The excellent property of multiple color outputs, different decay processes, and external field stimulation modes (including low energy light, thermal, and mechanical stimuli) present in CNSOF:Bi 3+ , Eu 3+ provides a fast, low-cost, and effective method for advanced anti-counterfeiting and information encryption applications.
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高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2020
·
IF 2.726
Shaoxing Guo,Pengyun Chen,Limei Song,Ping Guo,Jianhua Gao
A new mixed-anion phosphate crystal Cs 2 Bi 2 Sr(P 2 O 7 )(PO 4 ) 2 was obtained by molten salt method. Single-crystal X-ray diffraction data demonstrated that the compound crystallizes in monoclinic space group P 2 1 /c (No.14) with unit cell parameters a = 17.708(10) Å, b = 9.156(5) Å and c = 9.221(5) Å, β = 90.160(8) °. The structure exhibits a novel three-dimensional network, which is made up of BiO 6 , BiO 5 , SrO 6 and CsO 11 polyhedra sharing the corners with PO 4 tetrahedra and P 2 O 7 diphosphate groups. The band gap was estimated by the combined density functional theory and experimental study. Photoluminescence property of Cs 2 Bi 2- x Sr(P 2 O 7 )(PO 4 ) 2 : x Eu 3+ showed the excellent thermal stability and high quantum efficiency .
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DYES AND PIGMENTS
·
2026
·
IF 3.9
Jing Wang,Yuanyuan Tang,Yanmin Zhang,Xiangfeng Kong,Yan Liu
β -glucan served as the raw material to fabricate β -glucan-Eu(tta) 2 (phen), effectively enhancing Eu 3+ luminescence by synergistic sensitization. • β -glucan-Eu(tta) 2 (phen) showed selective luminescence quenching for Fe 2+ /Fe 3+ by a static quenching mechanism. • β -glucan reduced Eu 3+ coordination complex cytotoxicity and conferred antibacterial activity against S. aureus and E. coli. • Flexible luminescent films retained sensing performance and facilitated visual Fe 3+ detection. This study presents a novel lanthanide luminescent material featuring a synergistic sensitization system composed of β -glucan, 4,4,4-trifluoro-1-(thiophen-2-yl) butane-1,3-dione (tta), and 1,10-phenanthroline (phen), which efficiently enhances and modulates the luminescence of Eu 3+ . The resulting β -glucan-induced Eu 3+ coordination complex exhibits specific luminescent responses toward Fe 3+ and Fe 2+ , with detection limits (LOD = 3 σ /K SV ) of 1.44 μmol·L -1 and 1.05 μmol·L -1 , respectively. The luminescence quenching mechanism was attributed to static quenching, accompanied by the inner filter effect. Notably, luminescence quenched by Fe 3+ is reversible upon the addition of EDTA, whereas no luminescence recovery is observed when EDTA is introduced subsequent to Fe 2+ -mediated quenching. Furthermore, the antibacterial activity and cytotoxicity of β -glucan-induced Eu 3+ coordination complex have been evaluated. The antibacterial zone experiments confirm that β -glucan-induced Eu 3+ coordination complex has good antibacterial effects on both Staphylococcus aureus ( S. aureus ) and Escherichia coli ( E. coli ). β -glucan exerts a pronounced effect on mitigating the toxicity of Eu 3+ coordination complex. β -glucan-induced Eu 3+ coordination complex can form flexible luminescent films with carrageenan (CRG) or D4 hydrogel (D4), while retaining excellent luminescent properties, thereby holding significant potential for application in the detection of metal ions in environmental water samples. Download: Download high-res image (253KB) Download: Download full-size image
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Jie Fu,Yanling Chen,Jianhua Lin,Renguang Ye,Lei Lei,Yang Shen,Degang Deng,Shiqing Xu
Bi 3+ , Eu 3+ co-doped Ba 2 Y 2 Si 4 O 13 phosphors with multi-color luminescence properties were prepared by high temperature solid state method. The structure, luminescent properties and temperature characteristics were studied by X-ray diffraction, scanning electron microscope, fluorescence spectrum and temperature-dependence of emission spectrum. Ba 2 Y 2 Si 4 O 13 : Bi 3+ , Eu 3+ phosphors can emit color from cyan to red when the excitation wavelength was changed from 340 nm to 390 nm, which is attributed to that there are two Bi 3+ ion emission centers, and their emission intensity will change with the change of excitation wavelength. Moreover, the emission of the phosphor has good temperature sensing characteristics, based on the fluorescence intensity ratio of the two blue emission bands of Bi 3+ and the red emission peak of Eu 3+ , a multimode thermometer with high temperature sensitivity was constructed. At the same time, based on the dynamic luminescence characteristics of the phosphor, the dynamic anti-counterfeiting experiments are designed. Therefore, the results show that the material has a bright prospect in the field of temperature sensing and anti-counterfeiting.
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PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Ying Lv,Siting Fan,Yujie Zhao,Yu Liu,Xiaohang Zhang,Jie Zhao,Jian Yu
Single-component white phosphor is highly desirable to obtain efficient and stable white light-emitting diodes (w-LED). In this paper, a series of Bi 3+ , Tb 3+ , and Eu 3+ doped Ca 3 LuAl 3 B 4 O 15 (CLAB) luminescent materials were successfully prepared. The structure, morphology, and optical properties of samples were characterized by X-ray diffractometer, scanning electronic microscopy, and fluorescence spectroscopy , respectively. The synthesized phosphor exhibits strong blue band emission from Bi 3+ and intense characteristics line emission from Tb 3+ and Eu 3+ under ultraviolet (UV) light excitation. The emission color can fine be adjusted by changing the doping content of the three activators. The warm white light of CLAB:0.5%Bi 3+ ,2%Tb 3+ ,0.75%Eu 3+ with CIE chromaticity coordinates of (0.3728,0.3166), a CCT of 3671 K, and a Ra index of 87 could be realized under UV light excitation. The fabricated w-LED by combining UV chip with CLAB:0.5%Bi 3+ ,2%Tb 3+ ,0.75%Eu 3+ shows excellent thermal stability after high-temperature aging test, implying its promising application in single-phosphor-converted warm w-LEDs.
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JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Yiying Li,Wenwu You,Jun Zhao,Xiaomin Zhang,Gencai Pan,Yanli Mao
In this work, Al 2 W 3 O 12 :1%Cr 3+ ,2%Eu 3+ with two discriminable dual emissive centers is synthesized. Both Eu 3+ and Cr 3+ ions can be excited efficiently by 465 nm. Photoluminescence excitation (PLE) spectra and photoluminescence (PL) lifetime indicate that there is no energy transfer (ET) between Eu 3+ and Cr 3+ ions. It is worth noting that the photothermal stability of Eu 3+ ions is much better than that of Cr 3+ ions. Specifically, the ratio of I Cr /I Eu decreases linearly with increasing temperature. Therefore, a blue-LED-excitable luminescent thermometer based on Cr 3+ /Eu 3+ co-doped Al 2 W 3 O 12 is proposed. This developed self-calibrated luminescent temperature sensor possesses the relatively high absolute and relative sensitivity (0.38 K -1 and 2.9% K −1 respectively) as well as good cycle stability among the previously reported TM/Ln-based luminescent; thermometers. These superior features of the developed self-calibrated luminescent thermometer (SCLT) make it a very promising candidate for temperature sensing applications.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Qingling Zeng,Wenxiang He,Ning Zhang,Dongcai Guo
Sr 2 SnO 4 :Eu 3+ phosphors were prepared by a co-precipitation combined with hydrothermal method for the first time, and Li + was introduced to improve its luminescence performance. X-ray diffraction analysis determined that Sr 2 SnO 4 :Eu 3+ , Li + phosphors were successfully synthesized. The effects and mechanisms of Li + doping on the luminescence properties of Sr 2 SnO 4 :Eu 3+ were specifically discussed. At 260 nm excitation, the fluorescence spectra of the products were dominated by the 5 D 0 - 7 F 1 characteristic emission peak of Eu 3+ at 598 nm, with the electric dipole transition 5 D 0 - 7 F 2 being distinctly lower than the magnetic dipole transition 5 D 0 - 7 F 1 , indicating that Eu 3+ selectively replaced the highly symmetrical defective sites of Sn 4+ . The luminous intensity and decay lifetime were significantly enhanced through co-doping Li + , which played an essential role as a charge compensator. The optimum doping concentration of Li + was 7%. Finally, the color purity of Sr 2 SnO 4 :Eu 3+ , Li + reached 99.9%, suggesting that it could be developed as a potential orange-emitting material for solid-state lighting.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 5
·6239-6248
·
IF 2.478
Fan Wenli,He Youyi,Long Lizhen,Gao Yalei,Liu Fuchi,Liu Jun
To research and develop the potential red emission phosphors for warm white-light-emitting diodes (WLED), we systematically investigated double alkaline rare-earth molybdates KGd 1− x Eu x (MoO 4 ) 2 (0.05 ≤ x ≤ 1) phosphors. The crystal structure, morphology, chemical composition, and photoluminescence properties of the phosphors with different Eu 3+ doping concentrations were investigated in detail. The results indicate that Eu 3+ doping concentration can affect the crystal structure and morphology of KGd 1− x Eu x (MoO 4 ) 2 phosphors. The luminescence performance reveals that KGd 1− x Eu x (MoO 4 ) 2 phosphor could emit intense red emission under multiplexed excitations at 362, 382, 394, 465, and 535 nm, which are matched well with the commercial UV, blue and green LED chips. An abnormal quenching behavior was observed in the KGd 1− x Eu x (MoO 4 ) 2 phosphors. And the quenching behavior at the excitation of Eu 3+ –O 2− Charge-Transfer band and Eu 3+ ions 4 f –4 f transitions is quite different. Finally, we fabricated a WLED lamp by coating the InGaN blue chip with a mixture of YAG: Ce 3+ yellow phosphors and KEu(MoO 4 ) 2 red phosphors. The obtained WLED lamps showed warm white light with a lower CCT value (~ 5142 K) than that fabricated without the red phosphors (CCT = 5892 K). These results proved that the KGd 1− x Eu x (MoO 4 ) 2 could be a very promising red-emitting phosphor for WLED.
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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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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
JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Zongjie Zhang,Liangling Sun,Balaji Devakumar,G. Annadurai,Jia Liang,Shaoying Wang,Qi Sun,Xiaoyong Huang
In this paper, a series of Eu 3+ -activated double-perovskite Ca 2 LaTaO 6 (abbreviated as CLT: x Eu 3+ ; x = 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, and 0.8) red-emitting phosphors have been successfully synthesized via the conventional high-temperature solid-state reaction method. These samples were characterized by X-ray diffraction, Rietveld refinement , field-emission scanning electron microscope , elemental mapping, energy-dispersive spectrum, room-temperature photoluminescence , decay lifetimes, quantum efficiency, CIE color coordinates, and temperature-dependent emission spectra . Interestingly, under blue excitation into the 7 F 0 → 5 D 2 transition of Eu 3+ at 466 nm, the CLT: x Eu 3+ phosphors could emit bright red light corresponding to the 5 D 0 → 7 F J (J = 1, 2, 3, 4) transitions. Their luminescence properties have been investigated as a function of the Eu 3+ ions concentration . It was found that the CLT:0.4Eu 3+ sample exhibited the strongest emission intensity, and the concentration quenching effect was caused by the dipole-dipole interaction among Eu 3+ activators. Impressively, the emission intensity of the as-prepared CLT:0.4Eu 3+ phosphors was about 4.3 times higher than the commercial Y 2 O 3 :Eu 3+ red phosphors. Moreover, the CLT:0.4Eu 3+ sample had excellent CIE color coordinates of (0.665, 0.334) and supereminent color purity of 95.3%. Notably, the study on temperature-dependent emission spectra of the CLT:0.4Eu 3+ sample revealed its good thermal stability and color stability at high temperatures. These excellent photoluminescence properties of CLT:0.4Eu 3+ phosphors indicated their promising application potential in white light-emitting diodes as blue-light-excitable red phosphors.
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Analytical Methods
·
2021
·Vol. 13
·期 40
·4747-4755
·
IF 2.896
Wendi Lv,Xiaoying Yuan,Chenglu Yan,Qiuting Ma,Bing Wang,Juan Du,Baozhan Zheng,Dan Xiao
Eu3+-Doped nanoceria (Eu:CeO2) with self-integrated catalytic and luminescence sensing functions was synthesized by a simple and gentle one-pot method to build a dual-readout nanozyme platform for organophosphate compound (OPC) sensing in this work. The catalytic degradation of the model substrate of OPC, p-nitrophenyl phosphate (p-NPP), by as-prepared Eu:CeO2 can be completed in 2 min with little influence of temperature and pH values, highlighting the advantages of Eu:CeO2 as an artificial enzyme for dephosphorylation. Most importantly, the characteristic red emission of Eu3+ (592 nm) from Eu:CeO2 can be quenched by p-NPP, accompanied by a color change from colorless to yellow. Based on this, linear ranges of 4–50 μM with a detection limit of 3.3 μM and 1–20 μM with a detection limit of 0.6 μM for p-NPP were obtained by colorimetric and fluorescence methods, respectively. Furthermore, the fluorescence strategy was effectively applied to the determination of ethyl para-nitrophenyl (EPN), one of the most commonly used pesticides, with a detection limit of 5.86 μM. The proposed strategy was also successfully applied to the assay of p-NPP and EPN in real water samples, showing great application prospects in detecting OPC in the environment.
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高影响因子
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