CERAMICS INTERNATIONAL
·
2015
·
IF 2.605
Jie Chen,Ye Sheng,Xiuqing Zhou,Fei Gao,Chunming Lin,Zhan Shi,Xuechun Xu,Haifeng Zou
SiO 2 and Eu 3+ -doped SiO 2 submicron rods were conveniently fabricated via a sol–gel process at room temperature. In this process, citric acid served as a unique structural modifier through hydrolysis of TEOS at alkaline condition to obtain the silica submicron rods. The morphology of the products was sensitive to the conditions, such as stirring, gelation time and the dropping speed of NH 4 OH. By sampling the products at different reaction times, we discussed the formation and growing mechanism of SiO 2 :Eu 3+ submicron rods in detail. The weak interactions between ammonium citrate crystals and silica species may be the reasons of the rods formation. The obtained silica submicron rods were 5–6 μm in length and 650–750 nm in width and there was no obvious change after doping. Under UV light excitation, the undoped silica submicron rods exhibited blue emission, which may be associated with defect centers in the structures of the products. The Eu 3+ -doped silica submicron rods exhibited red emission, which was due to the 4f→4f transition of Eu 3+ . The effect of different doping concentrations of Eu 3+ ions on the luminescence was investigated. The samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectrum (FT-IR), Thermo-gravimetry Analysis (TGA), Scanning electron microscope (SEM), Transmission electron microscope (TEM), Energy-dispersive spectroscopy (EDS) and Photoluminescence spectrum.
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DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2016
·
IF 2.653
Renping Cao,Ting Fu,Dedong Peng,Chunyan Cao,Wen Ruan,Xiaoguang Yu
Host SrSb 2 O 6 , SrSb 2 O 6 :Bi 3 + , SrSb 2 O 6 :Eu 3 + , and SrSb 2 O 6 :Eu 3 + , Bi 3 + phosphors are synthesized by solid state reaction method in air. Host SrSb 2 O 6 with excitation 254 nm shows weak green-yellow emission in the range of 320–780 nm due to Sb 5 + → O 2– transition. SrSb 2 O 6 :Bi 3 + phosphor with excitation 365 nm emits green light within the range 400–650 nm owing to the 3 P 1 → 1 S 0 transition of Bi 3 + ion. SrSb 2 O 6 :Eu 3 + phosphor with excitation 254 nm exhibits a systematically varied hue from green to orange-red light by increasing Eu 3 + concentration from 0 to 7 mol%, and that with excitation 394 nm only shows orange-red light. The optimal Eu 3 + concentration is ~ 4 mol% in SrSb 2 O 6 :Eu 3 + phosphor. SrSb 2 O 6 :Eu 3 + , Bi 3 + phosphor with excitation 254 and 394 nm emits orange-red light. Emission intensity of SrSb 2 O 6 :Eu 3 + phosphor may be enhanced > 2 times by co-doping Bi 3 + ion because of the fluxing agent and energy transfer roles of Bi 3 + ion in SrSb 2 O 6 :Eu 3 + , Bi 3 + phosphor. The luminous mechanism of SrSb 2 O 6 :Eu 3 + , Bi 3 + phosphor is analyzed and explained by the simplified energy level diagrams of Sb 2 O 6 2 − group, Bi 3 + and Eu 3 + ions, and energy transfer processes between them.
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Mei Yang,Haiyan Shi,Liwei Ma,Qingyuan Gui,Jinlei Ma,Mimi Lin,Anwar Sunna,Wenjing Zhang,Liming Dai,Jia Qu,Yong Liu
The controlled synthesis of La 2 O 2 SO 4 :Eu 3+ nanofibres (NF) for luminescent applications is presented here for the first time. Three dimensional nanofibrous structures with average diameter of 90 nm were prepared successfully. Eu 3+ ions were further doped to study the luminescent property and phase structure. A strong red luminescence was obtained at the as-prepared NF. High asymmetry ratio (R) in the emission spectrum indicated that the Eu 3+ ions were located in a distorted cation environment and the luminescent NF obtained possessed a good colour purity. The emission intensity of the resulting NF varied with different Eu 3+ contents with the best emission brightness obtained at 20% Eu 3+ doping. An 18% improved luminescence decay time at a relative lower annealing temperature (650 °C) was obtained for the nanofibrous structure when compared to the corresponding bulk materials (BM). The quantum efficiency (QE) of the as-synthesised NF was found to be 6.3%, which was 17% enhanced from the QE of BM (5.4%). Oxidation activity of NF compared to BM was measured using Temperature-Programmed Reduction (TPR). The TPR peak temperature for the consumption of hydrogen was decreased 12% with the employment of NF, suggesting well improved oxygen storage capability of the resulting NF. Our results indicate the multifunctional applications of the resulting NF in different fields such as optics and oxygen storage.
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高影响因子
OPTICAL MATERIALS
·
2016
·
IF 2.183
Jiangling He,Youling He,Jianle Zhuang,Haoran Zhang,Bingfu Lei,Yingliang Liu
In this work, blue-light-emitting carbon dots (CDs) were composited with red-light-emitting europium ions (Eu 3+ ) solutions under the synergistic reaction of polyvinyl alcohol (PVA) to prepare the light conversion film. The formation mechanism of Eu 3+ /CDs/PVA film was detailedly discussed. It is the first report that this composite was synthesized through direct recombination of CDs and Eu 3+ solutions instead of traditional methods based on Eu 3+ coordination compound. Furthermore, tunable photoluminescence property can be successfully achieved by controlling the ratio of CDs to doped Eu 3+ , this property can meet the variable light component requirements for different species of plants.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Long Chen,Sijie Su,Peijing Tian,Jian Yuan,Weihong Zheng
Rare earth elements have attracted significant attention due to their unique electronic structure. By doping rare earth ions into oxides, they can be used as spectral conversion materials in fields such as photovoltaic power generation and biological probes. In this paper, the performance of Eu 3+ doped Al 2 O 3 hollow microspheres by sol-gel method was analyzed by SEM, XRD, IR, TG-DSC, and fluorescence spectrometer. Using aluminum isopropoxide (Al(OC 3 H 7 ) 3 ) as raw material, PMMA with a particle size of 150 nm as the template, PMMA/boehmite particles with core-shell structure can be prepared by sol gel method and template method. After adding Eu 3+ and heat treatment, a transition occurred from γ-AlOOH(85 °C)→γ-Al 2 O 3 (600 °C)→θ-Al 2 O 3 (1000 °C)→α-Al 2 O 3 (1200 °C) as the temperature increased, and EuAlO 3 was generated at 1200 °C. Eu 3+ occupied the sites without inversion centers inside the host lattice, and the alumina was an effective matrix for the fluorescent properties of Eu 3+ . Its excitation was caused by the 7 F 0 → 5 L 6 transition, and its luminescence was controlled by the 5 D 0 → 7 F 2 transition, which can convert ultraviolet light into red and orange light. The fluorescence intensity increases with the increase of Eu 3+ content, and no quenching was observed at a doping concentration of 10mol% Eu 3+ .
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高影响因子
Advanced Physics Research
·
2024
·
IF 0
Zhichao Zeng,Haolin Lu,Zhengwei Yang,Haolin Wu,Chuang Zhang,Guankui Long,Yaping Du
Chiral hybrid organic-inorganic perovskites (HOIPs) are widely investigated due to their superior chiroptical and chiral spintronic properties. Research on the enhancement of chiroptical performance is highly important for the real application of chiral HOIPs. This work employed a rare earth doping strategy to increase the magnetic transition dipole moment of chiral 2D HOIPs R -/ S -NPB (NPB = 1-(1-naphthyl) ethylammonium lead bromide). Doping with Eu 3+ does not change the original layered NPB microstructure, and R -/ S -NPB-Eu exhibited the magnetic dipole-allowed transition luminescence of Eu 3+ at 594 nm ( 5 D 0 → 7 F 1 ). Circular polarized luminescence (CPL) spectra combined with theoretical calculations and transient photoluminescence measurements indicated that the introduction of Eu 3+ can enhance the magnetic transition dipole moment of R -/ S -NPB, thus resulting in an unprecedented g lum of 0.05. To the best of our knowledge, this is the highest value for chiral perovskite films. This work combines the unique and superior optoelectronic properties of rare-earth ions with chiral perovskite and develops an efficient strategy to increase its anisotropy factor, which can accelerate the development of chiral optoelectronics and spintronics towards real application.
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DOI
INORGANIC CHEMISTRY COMMUNICATIONS
·
2020
·
IF 1.943
Xiangjia Meng,Shuai Huang,Mengmeng Shang
Red-emitting phosphors have attracted considerable interest for their applications in warm white light-emitting diodes (LEDs). A series of novel red emitting Eu 3+ -doped Ba 2 GdVO 6 phosphors were prepared by a solid-state reaction annealed at 1300 °C for 6 h. Under the excitation of blue light (465 nm), Ba 2 GdVO 6 :Eu 3+ phosphors emit pure red light. The critical distance at which concentration occurs is determined to be 8.7 Å when the doping concentration reached up to 20 mol%. More importantly, the as-prepared Ba 2 GdVO 6 :20%Eu 3+ phosphor exhibit good thermal stability. The PL intensity at 150 °C remains 72% of its initial intensity at room temperature. The preliminary studies show that the Ba 2 GdVO 6 :Eu 3+ might be a promising red material for application in blue light converted warm white LED.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2019
·
IF 2.961
Olga Giraldo Giraldo,Mingzhi Fei,Rongfei Wei,Liming Teng,Zhigang Zheng,Hai Guo
Bi 3+ /Eu 3+ -doped SiO 2 –Al 2 O 3 –CaO–B 2 O 3 –La 2 O 3 –K 2 O glasses were fabricated and the luminescent properties, energy transfer as well as thermal stability were systematically investigated. Under 333 nm light excitation, bluish-green luminescence centered at 480 nm is observed in the obtained Bi 3+ -doped glass. By co-doped with Eu 3+ , highly efficient energy transfer process happens from Bi 3+ to Eu 3+ via a quadrupole-quadrupole interaction. The energy transfer efficiency can reach 86% and the concentration of Eu 3+ is not quenched in here. With increasing Eu 3+ concentration, tunable luminescence from bluish-green via white to orange-red is realized. Significantly, pure white light emission with CIE coordinates (0.348, 0.333) is obtained when excited by 333 nm light. Temperature-dependent emission spectra present superior color stability in operating temperature lower than 423 K for the prepared glasses. These results indicate that these glasses are potential white light emitting materials for organic-resin-free W-LEDs.
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高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 12
·4685-4694
·
IF 4.569
Guixian Li,Yu Xue,Qinan Mao,Lang Pei,Hong He,Meijiao Liu,Liang Chu,Jiasong Zhong
Luminescent thermometers provide a non-contact method of probing temperature with high sensitivity and response speed at the nanoscale. Synergistic photoluminescence from different activators can realize high sensitivity for luminescent thermometers by finely selecting ions with specific crystallographic sites. Herein, the more temperature-sensitive Mn4+ and the less-sensitive Eu3+ (or Sm3+) activators are co-doped into a Ca2GdSbO6 matrix to form an effective thermometer, where Mn4+ and Eu3+ (or Sm3+) ions occupy the Sb5+ and Gd3+ sites, respectively. The co-doping of Eu3+ ions or Sm3+ ions leads to lattice expansion of Ca2GdSbO6 matrix and a tuned narrow emission from deep-red to orangish-red. According to the ratio of luminescence intensity, the maximal Sa and Sr values are 0.19 K−0 (347 K) and 1.38% K−( (420 K) for Ca2GdSbO6:Mn4+/Eu3+ probe and 0.26 K−p (363 K) and 1.55% K−( (430 K) for Ca2GdSbO6:Mn4+/Sm3+ probe thermometers, respectively. In addition, thermometers based on Mn4+ emission lifetimes can provide the highest relative sensitivity of 1.47% K−s at 425 K. Thus, the highly-temperature-sensitive Ca2GdSbO6:Mn4+/(Eu3+ or Sm3+) phosphor is a promising candidate for practical luminescence thermometers.
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高影响因子
CHEMICAL PHYSICS LETTERS
·
2014
·
IF 1.991
Lina Liu,Hongyu Xiao,Xiuyun An,Yongsheng Zhang,Ruifei Qin,Lishuang Liu,Dongmei Zhang,Ruirui Sun,Linfeng Chen
Well-dispersed YVO 4 :Eu 3+ nanoparticles (NPs) of about 8 nm were synthesized by a precipitation reaction and they were coated with SiO 2 by a reverse microemulsion method. The thickness of SiO 2 shells was altered by changing the molar ratio of tetraethoxysilane (TEOS)/YVO 4 :Eu 3+ . The influence of SiO 2 coating on the photoluminescence properties of the YVO 4 :Eu 3+ NPs was studied in detail. With the increase of the SiO 2 shell thickness, the intensity ratio of 5 D 0 - 7 F 2 / 5 D 0 - 7 F 1 becomes lower. It was interesting to observe that the quantum yield of naked YVO 4 :Eu 3+ is higher than that of YVO 4 :Eu 3+ @SiO 2 nanocomposites, and the result is opposite to a previous reference.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2019
·
IF 2.961
J. Zhang,Z.Y. Ma,J.G. Guo,G.M. Cai,L. Ma,X.J. Wang
Color-tunable phosphors based on a single host are superior to traditional mixed primary-color phosphors in fluorescent lamps, due to the better consistency of different color components in service. In this work, a series of Eu 3+ /Tb 3+ doped MgIn 2 P 4 O 14 phosphors were synthesized by a conventional solid state reaction method. The phosphors exhibit strong absorption around 254 nm with negligible absorption in the visible light region. Under the joint action of the co-activation, cross-relaxation, sensitization, and phonon-assistance, color-tunable reddish-orange-yellow-green-blue emission is achieved in MgIn 2 P 4 O 14 : Eu, Tb phosphors by adjusting the doping content, which demonstrates great potential for the application in fluorescent lamps.
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高影响因子
MATERIALS LETTERS
·
2015
·
IF 2.489
Renping Cao,Ting Fu,Yunling Cao,Hui Ao,Siling Guo,Guotai Zheng
Novel Sr 3 P 4 O 13 :Eu 3+ , Bi 3+ red phosphor is synthesized by a solid-state reaction method in air, and the crystal structures, fluorescence lifetimes and luminescence properties are investigated. The PLE band peaking at 394 nm due to 7 F 0 → 5 L 6 transition indicates that the phosphor can be effectively excited by near-UV InGaN chip, and five PL bands within the range 570–770 nm are attributed to 5 D 0 → 7 F J ( J =1, 2, 3, 4, and 5) transitions of Eu 3+ ion, respectively. The optimal Bi 3+ doping concentration is~5 mol%. PL intensity of Sr 3 P 4 O 13 :0.04Eu 3+ phosphor can be enhanced~7 times by codoping Bi 3+ ion due to the energy transfer between Eu 3+ and Bi 3+ ions. The luminous mechanism and energy transfer process are explained by energy level diagrams of Bi 3+ and Eu 3+ ions.
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高影响因子
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