CERAMICS INTERNATIONAL
·
2026
·
IF 6
Aihua Zhou,Xiaohong Wang,Chengguo Ming,Yumiao Pei
At present, many researchers are focusing on Er 3+ ions doped thermally enhanced upconversion luminescent materials. However, the anti-thermal-quenching downshifting emissions of the activator in a phosphor have not yet been studied in sufficient depth. Herein, Eu 3+ /Er 3+ co-doped YNbO 4 phosphors prepared are explored for selectively enhanced red emission (Eu 3+ : 5 D 0 → 7 F 2 and 5 D 0 → 7 F 4 ) due to the defect-mediated thermal enhancement of emission by thermal compensation mechanism. Moreover, the coexistence of intrinsic luminescence centers ([NbO 4 ] 3- ), Er 3+ and Eu 3+ ions enables tunable emission color shifting from red to green and red under excitation at 250 nm, 379 nm, and 395 nm, respectively. This multi-wavelength excitation approach ensures the material's application in anti-counterfeiting. Based on the different thermal response of [NbO 4 ] 3- and Eu 3+ ions, an optical temperature sensing is achieved. The relative sensitivity of YNbO 4 :2%Eu 3+ /8%Er 3+ sample could reach 2.466% K −1 at 323 K. The above results indicate that the sample is a promising candidate for multi-functional applications.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Xiumei Guo,Chengjun Pan,Heng Yu,Nian Wang,Ruirui Cui,Xiang Guo
To address the practical need for high-efficiency red-emitting phosphors in near-ultraviolet (n-UV) chip-powered white light-emitting diodes (WLEDs), Eu 3+ -doped Ca 3 Zr 2 Ga 2 SiO 12 (CZGSO: x Eu 3+ ) red phosphors were prepared using a conventional high-temperature solid-state reaction method. Subsequently, the optimized phosphor was incorporated with commercial blue and green phosphors to develop a n-UV excited white light-emitting diode (WLED) prototype. A systematic investigation was conducted on the crystal structure, photoluminescence behavior of the phosphors, as well as the practical performance of the device. The findings reveal that Eu 3+ ions successfully occupy the Ca 2+ crystallographic sites within the CZGSO matrix, and all samples retain a single-phase cubic garnet structure with homogeneously distributed constituent elements. The Eu 3+ ions are located in a highly asymmetric local crystal field environment. Under 393 nm excitation, the phosphor exhibits intense red emission centered at 610 nm, dominated by electric dipole transitions, showing good spectral matching with n-UV chips. The optimized composition, CZGSO:0.25Eu 3+ , demonstrates excellent luminescence performance, with a lifetime of 2.19 ms and an IQE of 70.1%. Additionally, this phosphor shows good thermal stability, retaining 85.1% of its initial emission intensity at 423 K, and possesses an activation energy of 0.18 eV. A WLED prototype constructed using this phosphor emits stable white light, achieving a correlated color temperature of 4989 K and a color rendering index of 88.2. Moreover, the spectral profile and color performance remain stable over a wide current range of 100–700 mA. These results suggest that CZGSO:Eu 3+ serves as a highly promising red-emitting phosphor for n-UV pumped WLEDs, representing a competitive option for advanced solid-state lighting.
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高影响因子
Inorganic and Nano-Metal Chemistry
·
2022
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IF 1.514
Zhiqiang Ding,Gongsheng Ding,Ling Fang,Zifei Peng
Red nanofluorescent materials based on CaWO4:Eu3+ were prepared by the molten salt method. Spherical CaWO4 particles with a size of 100 nm to 200 nm monodisperse sizes were prepared using different types of calcium salts. The KCl was chosen as the molten salt, under the same other experimental parameters, the obtained CaWO4:Eu3+ particles were more uniform, the diffraction properties were better. With a molar ratio of 15 for molten salt and Calcium salt, more spherical CaWO4:Eu3+ particles were produced small and sand homogeneous size. Using different amount of molten salt, it was found that the larger the amount of molten salt, the weaker the fluorescence property. Finally, by comparing the products obtained by the molten salt method with the solid state reaction method, it is found that the luminescence intensity of the products is 20% higher than that obtained by the solid state reaction method.
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高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2021
·Vol. 98
·期 3
·497-507
·
IF 2.326
Jia Ke,Bi Zun,Liu Yunfei,Lyu Yinong
Studying electronic structure plays a key role in improving the photoluminescence (PL) properties of materials. Therefore, the electronic structure of YF 3 : x Eu 3+ with different Eu 3+ ions doping concentrations was explored by first-principles calculations based on density functional theory (DFT). As calculated, the YF 3 host had an indirect bandgap of 7.68 eV. From all calculation results we got, the band structure of YF 3 : x Eu 3+ exhibited the smallest direct band gap of 6.54 eV when the value of x was 0.10. This small direct band gap is beneficial to obtain excellent emission intensity. Besides, the morphologies and sizes have a significant influence on the fluorescence intensity of the products. A series of YF 3 : x Eu 3+ phosphors with leaf-like, spindle-like, pecan-like, and granular-like morphologies were obtained by changing the RE 3+ /NaF ratio via a microwave hydrothermal method. At the same time, the formation process of granule-like YF 3 : Eu 3+ was explored through time-dependent experiments. Furthermore, the fluorescence performance of YF 3 : x Eu 3+ was studied in detail. The as-obtained YF 3 : x Eu 3+ can exhibit orange-red emission under ultraviolet excitation because of the magnetic dipole of the 5 D 0 – 7 F 1 transition of Eu 3+ ions. After comparing the luminescence properties of samples with different morphologies, we found that the sample with granule-like morphology had the highest orange-red emission intensity. The experimental result proved that the appropriate Eu 3+ ions doping concentration were x = 0.10, which is highly consistent with the calculation result.
The great orange-red emission intensity was obtained by adjusting the electronic structure and morphology of the YF 3 : x Eu 3+ . The electronic structures of YF 3 : x Eu 3+ can be altered by changing Eu 3+ doping concentrations. The morphologies can be regulated by changing the RE 3+ /NaF ratio. Besides, the formation process of granule-like YF 3 : 0.1Eu 3+ was explored through time-dependent experiments.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 18
·10979-10989
·
IF 4.22
Wang Jing,Wang Tao,Hu Yimeng,Zhang Xiaonan,Ma Yanyan,Lv Hongmin,Xu Shanshan,Wang Yinglong,Jiang Zike
In this work, novel β -cyclodextrin-enhanced Eu 3+ luminescence aggregates (CELAs) with bright red fluorescence of Eu 3+ are prepared. These CELAs exhibit the quick response and highly selective sensitivity at the concentration of 50 µM Fe 3+ . A series of ligands (such as TTA, phen, β -cyclodextrin) sensitizes the luminescence of Eu 3+ (the “antenna effect”), and metal ions–ligands interactions can differentially alter the antenna effect of ligands toward Eu 3+ . Addition of EDTA to chelate Fe 3+ restores the fluorescence, indicating that the fluorescence quenching in the presence of Fe 3+ is reversible. This research provides that CELAs integrate these merits of superior lanthanide fluorescence and the amphiphilia property of β -cyclodextrin ( β -CD). It is a unique system with enhancement Eu 3+ luminescence in ethanol–water system and will be applied for aqueous solution detection sensor with high selectivity and reversibility for Fe 3+ . On the other hand, the on-off fluorescence property of the CELAs is convenient for environmental detection system.
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高影响因子
OPTICAL MATERIALS
·
2021
·
IF 3.08
Dechuan Li,Gungping Zhu,Xuelian Zhao
KTb(CO 3 ) 2 :Eu 3+ phosphors with intense stokes emission were synthesized by hydrothermal method . Under the excitation of 368 nm light, the pure KTb(CO 3 ) 2 shows an intense green emission at 543 nm corresponding to the 5 D 4 → 7 F 5 transition of Tb 3+ , about 5 times higher than that of the K + -free Tb 2 O(CO 3 ) 2 phosphor. As the Tb 3+ is partly substituted by Eu 3+ , the luminescence color can be transformed from green to red. The intensity of red emission of KTb(CO 3 ) 2 :Eu 3+ could greatly increase as the contents of Eu 3+ without any concentration quenching. Under the excited by 368 nm near-ultraviolet, the quantum efficiencies of KTb(CO 3 ) 2 and KTb(CO 3 ) 2 :0.3Eu 3+ were 93% and 80%, respectively. The high quantum efficiency shows that KTb(CO 3 ) 2 :Eu 3+ is a useful color-tunable luminescence material under excitation of ultraviolet light in the anti-counterfeiting, lighting and display.
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高影响因子
OPTIK
·
2019
·
IF 1.914
Yulin Shi,Yudong Xu,Wenjie Hu,Lei Wang,Ruliang Liu,Heni Wang,Caiyue Zhao,Xinyi Chen,Min Shi
In this article, the authors prepared CaMgAl 10 O 17 : Sm 3+ , CaMgAl 10 O 17 : Eu 3+ and CaMgAl 10 O 17 : Sm 3+ , Eu 3+ phosphors via high temperature solid-state reaction and studied the phase constituents and photoluminescence (PL) of the phosphors as-synthesized. The main emission peaks of CaMgAl 10 O 17 : Sm 3+ at 559 nm, 590 nm and 639 nm are due to 4 G 5/3 → 6 H 5/2 , 4 G 5/3 → 6 H 7/2 and 4 G 5/3 → 6 H 9/2 transitions of Sm 3+ activator, respectively. The optimum doping concentration of Sm 3+ in CaMgAl 10 O 17 is 3 mol. %. The main emissions of CaMgAl 10 O 17 : Eu 3+ peaked at 586 nm and 610 nm belong to 5 D 0 → 7 F J (J = 1, 2) transitions of Eu 3+ activator. When Eu 3+ ions are added into CaMgAl 10 O 17 : 0.03 Sm 3+ phosphors, an energy transfer between Sm 3+ and Eu 3+ via an electrical multipole interaction occurs, and the emission intensity of CaMgAl 10 O 17 : 0.03 Sm 3+ , Eu 3+ phosphors is greatly improved.
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MATERIALS RESEARCH BULLETIN
·
2019
·
IF 3.355
Renping Cao,Xinyan Lv,Yuming Jiao,Yaqin Ran,Siling Guo,Hui Ao,Ting Chen,Ting Fan
Ca 3 La 6 Si 6 O 24 :Eu 3+ phosphors are synthesized in air through high-temperature solid-state reaction method. The crystal structure, morphology, and luminescence properties are investigated. Ca 3 La 6 Si 6 O 24 :Eu 3+ phosphor emits orange-red light in the range of 570–750 nm due to the 5 D 0 → 7 F S ( S = 0, 1, 2, 3, and 4) transitions of Eu 3+ ion. The optimal Eu 3+ doping concentration is ∼8 mol%. The energy transfer mechanism is the electric multipolar interactions. The luminescence lifetimes are ∼1.70, 1.66, 1.62, 1.57, 1.51, and 1.49 ms for x = 2, 4, 6, 8, 10, and 12 mol%, respectively. Ca 3 La 6 Si 6 O 24 :Eu 3+ phosphor shows excellent thermal stability with the E a value ∼0.3314 eV. The luminous and temperature quenching mechanisms are explained by the energy level diagram and configurational coordinate diagram of Eu 3+ ions, respectively. The experimental results indicate that Ca 3 La 6 Si 6 O 24 :Eu 3+ phosphor has a potential application in white light-emitting diodes (LEDs) based on the near UV (394 nm) LED chip.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 21
·10025-10035
·
IF 3.3
Renping Cao,Zibin Lai,Yewen Cao,Fangrui Cheng,Chenxing Liao,Shuijing Nie,Xuehua Yi,Jing Wang
Luminescent materials used in solid-state lighting usually face the challenge of the adjustment of luminescence properties. The coordinated luminescence of two activators in luminescent materials is a good method. Herein, CaAl2Si2O8:Dy3+, CaAl2Si2O8:Eu3+, and CaAl2Si2O8:Dy3+, Eu3+ with a pure phase (CaAl2Si2O8) were synthesized in air. The X-ray diffraction patterns of the samples were measured and their crystal structures were elucidated. Under excitation at 350 nm, the yellow emission of CaAl2Si2O8:Dy3+ in the spectral range of 525–800 nm was observed due to the 4F9/2 → 6H15/2, 6H13/2, 6H11/2, and 6H9/2 transitions of Dy3+ ions. CaAl2Si2O8:Eu3+ showed red emission in the range of 550–720 nm because of the transitions 5D0 → 7F1, 7F2, 7F3, and 7F4 of Eu3+ ions when it was excited by 394 nm light. A tunable color emission of CaAl2Si2O8:Dy3+, Eu3+ from yellow to red was found when the ratio between Dy3+ and Eu3+ ions was changed. We investigated the concentration-dependent spectra and ensured the optimal Dy3+ and Eu3+ concentrations in host CaAl2Si2O8. The spectra of the samples manifested the energy transfer from Dy3+ to Eu3+ ions. The energy-level diagrams of Dy3+ and Eu3+ ions were used to analyze the luminous mechanism of the samples. The research results are beneficial to the development of other Dy3+ and Eu3+ co-doped luminescence materials.
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高影响因子
ACS Applied Nano Materials
·
2019
·
IF 0
Peng Du,Weiguang Ran,Yafei Hou,Laihui Luo,Weiping Li
The Eu3+-activated NaGdF4 nanorods were achieved through a simple precipitation procedure at ambient temperature. With the irradiation at 396 nm, the designed nanorods exhibited visible red light with admirable color purity of 90.5% and the optimal doping concentration was 50 mol %. The concentration quenching mechanism was revealed to be decided by dipole–quadrupole interaction and the critical distance was 11.14 Å. The optical transition parameters, which were estimated from Judd-Ofelt theory, of the Eu3+ ions were obtained to confirm its local symmetry behaviors. Moreover, the emission spectra of the designed nanorods at diverse temperatures were used to identify its thermal quenching performance. In comparison with that of the Y2O3:Eu3+ compound, the emission intensity of the Eu3+-activated NaGdF4 nanorods with optimum doping content was 2.47 times higher and its internal quantum efficiency was around 62.3%. Furthermore, the developed white light-emitting diode device, which was constructed by resultant nanorods, green-emitting phosphor (i.e., (Ba,Sr)2SiO4:Eu2+), blue-emitting phosphor (i.e., BaMgAl10O17:Eu2+), and a near-ultraviolet chip, exhibited admirable colorific properties (i.e., good color coordinates, low correlated color temperature, high color rendering index). These achieved features implied that the NaGdF4 nanorods doped with Eu3+ ions were sutiable red-emitting platforms for indoor illumination.
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TALANTA
·
2019
·
IF 4.916
Yuanyuan Li,Qianqian Du,Xiaodan Zhang,Yuming Huang
Tetracycline (TC), a widely-used antibiotic to treat bacterial infections, combines with Eu 3+ to form a stable EuTC complex that has a low fluorescence (FL) yield because of Eu 3+ coordination with water molecules. We report a simple, label-free ratiometric fluorescent platform for sensitively and selectively sensing of TC, using L-histidine caped gold nanoclusters (His-AuNCs) as a FL indicator and an enhancer of Eu 3+ FL. The His-AuNCs were prepared via chemical reduction of Au(III) by L-histidine, which was a reducer and a protecting agent. The His-AuNCs exhibited good photostability, outstanding stability toward high ionic strengths , storage stability, and favorable optical properties . In the absence of TC, the AuNCs-Eu 3+ system displays strong FL emission at 475 nm ( F 475 ) from the His-AuNCs and weak FL at 620 nm from Eu 3+ ( F 620 ) with excitation at 375 nm. TC quenches the His-AuNC FL and greatly enhances the Eu 3+ emission. This is attributed to an enhancement of the EuTC complex fluorescence by the His-AuNCs. Thus, a ratiometric F 620 / F 475 FL signal can be used for TC detection by simply mixing AuNCs and Eu 3+ . Under the optimized conditions, the linear range from 10 nM to 60 μM and a detection limit of 4 nM (S/N = 3) for TC were obtained. The application of the assay platform for the detection of TC in environmental and biological samples was demonstrated. The sensing platform has advantages of easy preparation, rapid response, high sensitivity, and good selectivity.
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PubMed
高影响因子
THIN SOLID FILMS
·
2019
·
IF 1.888
Mingyue Ma,Haidong Li,Fengmei Cheng,Daocheng Pan
Semiconducting and luminescent thin films could be served as the emitting layer in electroluminescent devices. In this work, Eu 3+ -doped yttrium vanadium oxide (YVO 4 ) luminescent thin films were directly deposited by a solution processing method, and they were annealed at a low temperature of 400 °C. Such low annealed temperature is compatible with commonly used transparent conductive electrodes, such as tin-doped indium oxide and fluorine-doped tin oxide. In addition, the luminescent thin films have a band gap of 3.94 eV and an absolute photoluminescence quantum yield of 23%. These results revealed that Eu 3+ -doped YVO 4 luminescent thin films have a high potential in electroluminescent devices.
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