OPTICAL MATERIALS
·
2024
·
IF 3.8
Qilin Yu,Jingxiang Liu,Pengjun Zhang,Shuwei Hao,Chongqiang Zhu,Chunhui Yang
A novel red phosphor BaY 4 Si 3 O 13 :Eu 3+ (BYSO:Eu 3+ ) was designed and prepared through a high-temperature solid-phase method in this work. It was found that the addition of Li 2 CO 3 in the synthesis process could significantly decrease the sintering temperature and increase the intensity and purity of red emission, as more lower symmetry sites were occupied by Eu 3+ . The optimum preparation conditions of BYSO:Eu 3+ were obtained as sintering at 1350 °C for 3h with the doping of 18% Eu 3+ and 5% Li 2 CO 3 . The CIE chromaticity coordinate was (0.636,0.362) and color purity reached 91.56% at room temperature, and 53.93% of the initial PL intensity could be retained when the temperature rose up to 453 K. The results showed that BYSO:Eu 3+ had greatly potential application in white LED deriving from the great red emission.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Lihong Bao,Xiaojian Pan,Hongyan Zhang,Jun Wang,Yanchun Yang,Kefu Chao,Ojiyed Tegus
A novel alkaline earth niobates red phosphor CaNb 2 O 6 :Eu 3+ have been prepared through solid-state reaction, using the nanocrystalline EuB 6 as a novel activator. The Rietveld refinement of XRD results reveal that the Eu 3+ ions substitute the lattice site of Ca 2+ ions and the B 2− ions replace the lattice site of O 2− ions, which induces the defect energy levels at the band gap of 5 D n levels and leads to higher luminescence intensity of five times higher than using the Eu 2 O 3 activator. The CIE chromaticity coordinates of Ca 0·88 Nb 2 O 6 :0.12EuB 6 phosphor were calculated to be (0.643, 0.34) and it is quite similar to that of pure red light. Moreover, this phosphor exhibits an excellent luminescence thermal stability. When the ambient temperature rises to 398 K (125 °C) and 423 K (150 °C), the integrated emission intensity remains 90% and 86% of their initial PL intensity at 300 K, respectively. Based on above mentioned, the Ca 1-x Nb 2 O 6 :xEuB 6 as a NUV-excited red phosphor have a potential application for the high-performance white LEDs.
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高影响因子
Materials Research Express
·
2020
·Vol. 7
·期 3
·036201
·
IF 1.929
Hui Yu,Xinan Shi,Lijian Huang,Xiaojiao Kang,Daocheng Pan
A series of Eu3+ and Tb3+ co-doped CaMoO4/SrMoO4 luminescent thin films were prepared by a facile solution method, and they were annealed at 550 °C for 2 h. The luminescent properties of the thin films were studied, which involve the energy transfer from Tb3+ to Eu3+. The emission color can be changed from green to red, with increasing Eu3+ doping concentration in Tb3+-doped CaMoO4/SrMoO4 thin films. In addition, it was observed that the PL intensity of Eu3+ will enhance when Tb3+ ions are incorporated into Eu3+-doped CaMoO4/SrMoO4 thin films. The optical band gaps of the luminescent thin films are found to be in the range of 4.49 to 4.72 eV. These results revealed that Eu3+ and Tb3+ co-doped CaMoO4/SrMoO4 luminescent thin films have a significantly potential application in electroluminescent devices.
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高影响因子
OPTICAL MATERIALS
·
2020
·
IF 2.779
Xibing Li,Huijie Yang,Nan Ding,Wentao Huang,Xiaoyue He,Mingxun Yu,Lixi Wang,Qitu Zhang
A series of double perovskite (Gd 0.85- x Lu x ) 2 MgTiO 6 : 0.3Eu 3+ red phosphors were prepared via a typical high temperature solid-state reaction. XRD and HRTEM exhibits that the phosphors well crystallized as a double perovskite with the space group of P21/n symmetry. The luminescent properties of samples were investigated via excitation and emission spectra . The phosphors emit strong red light and weak orange red light under ultraviolet (UV) and near-UV excitation suggesting that Eu 3+ ions situated in the sites without inversion symmetry. The UV–vis spectra included a broad host absorption band assigned to O 2- -Eu 3+ and some peaks at 395 nm, 465 nm and 533 nm attributed to the typical f-f transition of Eu 3+ . The CIE chromaticity coordinates of all samples were near to the standard red light, indicating that the (Gd 0.85- x Lu x ) 2 MgTiO 6 : 0.3Eu 3+ was a potential candidate material for red emitting phosphors. The decay curves matched with the lines fitted by a one exponential decay formula and the decay time increased with increasing Lu 3+ -dopant concentration within x < 0.8. The temperature-dependent emission spectra from 298 K to 473 K were used to evaluate the thermal stability of Gd 0.9 Lu 0.8 Eu 0.3 MgTiO 6 phosphors and the activation energy of Gd 0.9 Lu 0.8 Eu 0.3 MgTiO 6 for 5 D 0 - 7 F 2 transition was calculated to be 0.158eV. The results revealed that the phosphors have the excellent thermal stability and were promising material for applications in LEDs.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Tao Su,Yue Zhong,Jing Xie,Yang Li,Xianze Li,Wenming Wang,Yan Pan,Xiantao Wei,Yong Li
Bi 3+ and Eu 3+ co-doped Ba 2 Sc 2 B 4 O 11 phosphors with near-white emission were successfully synthesized via a conventional solid-state reaction route. This work systematically investigates the microstructure, band structure, photoluminescence, and chromaticity coordinates of Ba 2 Sc 2 B 4 O 11 phosphors doped individually with Bi 3+ or Eu 3+ , as well as co-doped with both ions. The Bi 3+ -doped phosphors exhibits cyan emission, while co-doping with Bi 3+ /Eu 3+ achieves near-white emission. Intriguingly, the relative intensities of Eu 3+ magnetic dipole ( 5 D 0 → 7 F 1 ) and electric dipole ( 5 D 0 → 7 F 2 ) transitions exhibit excitation-dependent behavior. Under 266 nm excitation, the magnetic dipole transition dominates, whereas the electric dipole transition prevails under 355 nm excitation. Furthermore, the relative sensitivity of the dual-emission centers (Bi 3+ and Eu 3+ ) was quantitatively analyzed. The results demonstrate that the Ba 2 Sc 2 B 4 O 11 : Bi 3+ , Eu 3+ phosphor exhibits promising sensing performance, suggesting its potential as a candidate for optical temperature sensing applications.
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高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Yujie Chen,Fanlei Qin,Jiawen Wang,Kai Yang,Yinyan Li,Gongxun Bai
Perovskite quantum dots with halogen elements (Cl, Br, I) have been extensively studied due to their unique optoelectronic properties. However, the spectral properties of luminescent materials continue to present challenges in perovskite quantum dot glasses. Here, Eu3+-doped CsPbBr3 quantum dot glasses were successfully prepared. Meanwhile, optimizing the doping concentration of Eu3+ significantly improved the formation of quantum dots and enhanced their fluorescence intensity. After a heating–cooling cycle, the CsPbBr3:0.5% Eu3+ glass still retained 95% of its initial value. By coating CsPbBr3:0.5% Eu3+ glass powder with red phosphor on a blue chip, a white LED with a CCT of 5417 K can be prepared. Therefore, Eu3+-doped CsPbBr3 quantum dot glasses demonstrate significant potential as an efficient material for optical lighting applications.
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高影响因子
CLAYS AND CLAY MINERALS
·
2024
·
IF 2
Rao-ping Liao,Yong-gui Chen,Chuang Yu,Wei-min Ye,Dong-bei Wu,Cong Liu,Qiong Wang
Compacted bentonite, used as an engineering barrier for permanent containment of high-level radioactive waste, is susceptible to mineral evolution resulting in compromise of the expected barrier performance due to alkaline–thermal chemical interaction in the near-field. To elucidate the mineral-evolution mechanisms within bentonite and the transformation of the nuclide adsorption properties during that period, experimental evolution of bentonite was conducted in a NaOH solution with a pH of 14 at temperatures ranging from 60 to 120°C. The results showed that temperature significantly affects the stability of minerals in bentonite under alkali conditions. The dissolution rate of fine-grained cristobalite in bentonite exceeds that of smectite, with the phase-transition products of smectite being temperature-dependent. As the temperature rises, smectite experiences a three-stage transformation: initially, at 60°C, the lattice structure thins due to the collapse of the octahedral sheets; at 80°C, the lattice disintegrates and reorganizes into a loose framework akin to albite; and by 100°C, it further reorganizes into a denser framework resembling analcime. The adsorption properties of bentonite exhibit a peak inflection point at 80°C, where the dissolution of the smectite lattice eliminates interlayer pores and exposes numerous polar or negatively charged sites which results in a decrease in specific surface area and an increase in cation exchange capacity and adsorption capacity of Eu3+. This research provides insights into the intricate evolution of bentonite minerals and the associated changes in radionuclide adsorption capacity, contributing to a better understanding of the stability of bentonite barriers and the effective long-term containment of nuclear waste.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2025
·
IF 3.6
Duo Chen,Ruiyuan Bi,Lifeng Xun,Xiaopeng Zhao
Building upon an anion doping strategy, this study proposes using F - regulation to enhance the luminescence performance of Ga 2 O 3 :Eu 3+ phosphors. To address the contradiction between the low Eu 3+ characteristic absorption and the strong Ga 2 O 3 intrinsic emission induced by charge transfer band (CTB) excitation in traditional Ga 2 O 3 :Eu 3+ systems, this study successfully prepared a series of Ga 2 O 3 :Eu 3+ /F - phosphors with different F - doping concentrations using an oleic acid-assisted solvothermal method combined with high-temperature sintering. The phases, morphology, structure, and luminescent properties of the samples were systematically analyzed. Experimental results show that F - successfully replaces part of the O 2- in the phosphor and alters the local symmetry of Eu 3+ , which results in 5 D 0 → 7 F 1 becoming the main transition path for the characteristic luminescence of Eu 3+ , shifting the main emission peak from 615 nm to 587 nm. Under CTB excitation, F - doping significantly enhanced the Eu 3+ characteristic emission without significantly altering the Ga 2 O 3 matrix emission. Under optimal reaction conditions, the luminescence intensity of the magnetic dipole transition in Ga 2 O 3 :Eu 3+ /F - phosphor was enhanced approximately 26-fold, with the quantum yield reaching 9.26% and the 5 D 0 excited state lifetime increasing to 1.83 ms. This modulation of the emission behavior also caused the phosphor chromaticity to shift from blue-purple to orange. This study demonstrates the selective enhancement mechanism of F - doping in Ga 2 O 3 :Eu 3+ luminescence, providing a reference for the design of high-performance rare-earth luminescent materials.
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高影响因子
MOLECULES
·
2025
·Vol. 30
·期 9
·1945
·
IF 4.6
Zaifa Yang
In recent years, rare earth ion and transition metal ion co-doped fluorescent materials have attracted a lot of attention in the fields of WLEDs and optical temperature sensing. In this study, I successfully prepared the dual-emission Mg3Ga2SnO8:Eu3+,Mn4+red phosphors and the XRD patterns and refinement results show that the prepared phosphors belong to the Fd-3m space group. The energy transfer process between Eu3+and Mn4+was systematically investigated by emission spectra and decay curves of Mg3Ga2SnO8:0.12Eu3+,yMn4+(0.002 ≤ y ≤ 0.012) phosphors and the maximum value of transfer efficiency can reach 71.2%. Due to the weak thermal quenching effect of Eu3+, its emission provides a stable reference for the rapid thermal quenching of the Mn4+emission peak, thereby achieving good temperature measurement performance. The relative thermometric sensitivities of the fluorescence intensity ratio and fluorescence lifetime methods reached a maximum value of 2.53% K−1at 448 K and a maximum value of 3.38% K−1at 473 K. In addition, the prepared WLEDs utilizing Mg3Ga2SnO8:0.12Eu3+phosphor have a high color rendering index of 82.5 and correlated color temperature of 6170 K. The electroluminescence spectrum of the synthesized red LED device by Mg3Ga2SnO8:0.009Mn4+phosphor highly overlaps with the absorption range of the phytochrome PFRand thus can effectively promote plant growth. Therefore, the Mg3Ga2SnO8:Eu3+,Mn4+phosphors have good application prospects in WLEDs, temperature sensing, and plant growth illumination.
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PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Chengxiang Yang,Tingting Gou,Haoyu Wang,Qi You,Wenwei Lai,Yue Wang,Zhihao Du,Zhaobin Tang,Wei Liu,Xuchuan Jiang
Narrow-band red phosphors excited by blue light are vital for high-color-rendering lighting and wide-color-gamut displays. Nevertheless, the commonly utilized red phosphors exhibit considerable deficiencies in hydrothermal stability and color purity, thus constraining their practical usage. In this study, by using a developed doping strategy with Ca 2+ to regulate a local crystal field and the possible preferential occupation behavior of the Sr 2 YNbO 6 :Eu 3+ red phosphor with a double perovskite structure, it is found that their luminescence intensity and thermal stability are significantly enhanced. High-resolution scanning transmission electron microscope (STEM) measurements equipped with an aberration corrector revealed that Eu 3+ occupied the Sr 2+ or Y 3+ sites, forming two emission centers. This resulted in significant changes in the emission intensity at 594 nm and 611 nm with changes in the excitation wavelength. Furthermore, the introduction of Ca 2+ can increase the proportion of Eu 3+ at the Sr 2+ site, thereby enhancing the emission of the 5 D 0 → 7 F 2 transition at 611 nm. Meanwhile, we have significantly improved the color purity and thermal stability of the obtained red phosphors. The current findings reveal the site-selective luminescence mechanism in Eu 3+ -activated double perovskite structures and propose a cation substitution strategy to optimize excitation and emission simultaneously. This approach may provide an effective pathway for the design of high-performance red phosphors for advanced optoelectronic applications.
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 52
·期 10
·5857-5870
·
IF 2.599
Zhao Bei,Shen Dingyi,Tan Qinyue,Tang Jianfeng,Zhou Xianju,Hu Shanshan,Yang Jun
CaF 2 :Ln 3+ (Ln = Ce, Tb, Eu) phosphors with highly uniform shapes have been successfully synthesized by a simple hydrothermal method directly. The as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), photoluminescence (PL) and lifetime. The results indicated that the pH values, organic additive and reaction time have a significant effect on the morphology and dimensions of CaF 2 microcrystals and the possible formation mechanism was also proposed. Furthermore, the energy transfer from Ce 3+ to Tb 3+ and from Tb 3+ to Eu 3+ and from Ce 3+ to Tb 3+ to Eu 3+ was observed and the corresponding mechanisms were discussed in detail. The CaF 2 :Ln 3+ phosphors may have potential optical applications in near-UV and violet LEDs.
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高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 9
·2596-2603
·
IF 6.641
Xiaohui Li,Bojana Milićević,Miroslav D. Dramićanin,Xiping Jing,Qiang Tang,Jianxin Shi,Mingmei Wu
Single-component white light phosphors with a broad and full color spectrum are urgently required to overcome residual problems with commercial phosphors. In this paper, we describe how Eu3+, as the dopant of Sr3ZnTa2O9 (SZT), plays an important role in structural modulation (including structural order–disorder and intrinsic oxygen defects), as demonstrated by electronic structural calculations and systematic experiments. Furthermore, 5D0 → 7F2 emission of Eu3+ provides the red component of the emission spectrum and increases the color rendering index of SZT:Eu3+ phosphors. Consequently, the resulting phosphor SZT:10%Eu3+ shows significantly enhanced emission intensity, and its broadband emission covers the entire visible region from 400 nm to 720 nm. A fabricated LED device using a near-ultraviolet 370 nm chip coated with a single-component, the SZT:10%Eu3+ phosphor, shows warm white emission with a high color rendering index (Ra = 82).
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