MATERIALS RESEARCH BULLETIN
·
2022
·
IF 5.6
Renping Cao,Zhiyi Huang,Bang Lan,Lan Li,Xuehua Yi,Zhiyang Luo,Chenxing Liao,Jing Wang
Ca 3 Zn 3 Te 2 O 12 :Bi 3+ , Ca 3 Zn 3 Te 2 O 12 :Eu 3+ , Ca 3 Zn 3 Te 2 O 12 :Eu 3+ /Bi 3+ are prepared successfully in air. The crystal phase, microscopic image, and optical properties of samples are investigated by the X-ray difractometer, scanning electron microscopy, and edinburgh steady-state FLS 980 spectrograph. The green emission of Ca 3 Zn 3 Te 2 O 12 :Bi 3+ phosphor with excitation at 314 nm is observed and its broad emission spectrum in the range of 360 - 790 nm is attributed to the 3 P 1 → 1 S 0 transition of Bi 3+ ion. Under excitation at 395 nm, the red emission of Ca 3 Zn 3 Te 2 O 12 :Eu 3+ is found, the chromaticity coordinates are (0.6392, 0.3605), and its PL spectrum is in the rang of 575 - 750 nm because of the 5 D 0 → 7 F 0 , 7 F 1 , 7 F 2 , 7 F 3 , and 7 F 4 transations of Eu 3+ ion. The doping Bi 3+ ion can affect the luminescence properties of Ca 3 Zn 3 Te 2 O 12 :Eu 3+ phosphor. The adjustable color light from green to yellow of Ca 3 Zn 3 Te 2 O 12 :Eu 3+ , Bi 3+ phosphor with excitation at 314 nm is revealed when Eu 3+ concentration is changed from 0 to 12 mol%. When the excitation wavelength is 395 nm, Ca 3 Zn 3 Te 2 O 12 :Eu 3+ , Bi 3+ phosphor only emits red light with emission spectrum in the rang of 575 - 750 nm. The energy level diagrams of Eu 3+ and Bi 3+ in Ca 3 Zn 3 Te 2 O 12 :Eu 3+ , Bi 3+ are drawn, which is used to analyze the luminous mechanism of samples.
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高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2020
·
IF 2.463
Xingbang Dong,Huanjun Zhang,Yang Yang,Shiquan Feng,Zheng Wang,Chaosheng Yuan,Kun Yang,Xuerui Cheng
InNbO 4 and InNbO 4 :Eu 3+ phosphors were synthesized by solid-state reaction method. The structural stability and crystal field under high pressure are investigated up to 34.5 GPa using in-situ Raman and luminescence spectra . The evolution of Raman and luminescence spectra with pressure of InNbO 4 revealed one reversible phase transition at around 12 GPa. A progressive red shift and luminescence quenching were observed for InNbO 4 :Eu 3+ phosphors during compression. The pressure-induced variation of local environment and crystal field around Eu 3+ ions was analyzed using Judd–Ofelt (J-O) intensity parameter Ω 2. Both the parameter Ω 2 and luminescence property were indicative of a pressure-induced lower asymmetry around Eu 3+ sites in InNbO 4 . These results suggest that the pressure has a great influence on fluorescence intensity and energy levels of Eu 3+ ions.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2019
·
IF 2.961
Lijun Gao,Cong Li,Chongzhou Wang,Jing Cui,Liming Zhou,Shaoming Fang
The rare earth complex (Eu(PBA) 3 ) with the active functional group ( OH) was prepared by p -hydroxybenzoic acid (PBA) and europium chloride in the ethanol solution. Then, the photoluminescence polyurethane (Eu(PBA) 3 /PU) materials were synthesized by the reaction of the functional groups on the complex with the isocyanates in the polyurethane reaction system. The content of the complex has great influence on photoluminescence performances of Eu(PBA) 3 /PU materials. The fluorescence intensity increases with the increase of Eu(PBA) 3 content. Especially, the obtained Eu(PBA) 3 /PU materials possess good fluorescence emission purity and a long luminescence lifetime , which have potential applications in optical display instruments.
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高影响因子
CRYSTAL GROWTH & DESIGN
·
2017
·
IF 4.055
Meiqi Chang,Yanhua Song,Jie Chen,Lei Cui,Ye Sheng,Zhan Shi,Haifeng Zou
SiO2@TiO2:Eu3+ core–shell structure was synthesized by a surfactant-free solvothermal method, and its luminescence intensities were increased through a coating SiO2 layer. Furthermore, SiO2@TiO2:Eu3+@SiO2 core double-shell structures with different coating thicknesses have been prepared to examine the relationship between luminescence intensity and thickness. In addition, luminescence enhancement mechanisms including the surface repair effect and excitation/emitted light absorption effect were proposed. Moreover, the luminescence properties and photocatalytic behaviors of SiO2@TiO2:Eu3+ core–shell structure and its derivatives SiO2@TiO2:Eu3+ yolk–shell structure and TiO2:Eu3+ hollow structure have been investigated in detail. It is worth mentioning that yolk–shell and hollow structures could be obtained by changing the order of the calcination and etching process of the SiO2@TiO2:Eu3+ core–shell structure. Herein, the hollow structure showed the highest luminescence intensity, and the core–shell structure exhibited excellent photocatalytic efficiency for the degradation of methyl orange.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2017
·Vol. 29
·期 1
·124-129
·
IF 2.019
Niu Pengfei,Liu Xiaohua,Wang Yiru,Zhao Weiren
Ba 2 LaV 3 O 11 :Eu 3+ phosphors were firstly synthesized by the traditional solid-state reaction method at 1100 °C. Their luminescence properties were investigated by photoluminescence excitation and emission spectra. The excitation spectrum shows a broad band centered at about 275 nm in the region from 200 to 370 nm, which is attributed to an overlap of the charge transfer transitions of O 2− → V 5+ and O 2− → Eu 3+ . The phosphors exhibit the red emissions of Eu 3+ and the emission intensity ratio of 5 D 0 → 7 F 2 to 5 D 0 → 7 F 1 is dependent on the Eu 3+ concentration due to an environment change about Eu 3+ ions. Concentration quenching occurs at 30 mol% in the phosphors and exchange interaction is its main mechanism. Ba 2 LaV 3 O 11 :Eu 3+ displays tunable CIE color coordinates from yellow orange to red depended on Eu 3+ content, which may have a potential application for illuminating and display devices.
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Micro & Nano Letters
·
2018
·Vol. 13
·期 3
·393-396
·
IF 0.841
Ting Fan,Jiantao Lü,Yongfa Huang,Guoji Li
Monodisperse oleic acid (OA) modified Eu 3+ and Li + codoped CaF 2 nanoparticles are presented in this work. The as-obtained nanoparticles, with a hexagonal shape, can be well-dispersed in organic apolar solvents. The incorporation of Li + ions in CaF 2 :Eu 3+ does not lead to new crystalline phases. The main diffraction peaks are found to shift to small angles when codoped with 7 mol% Li + , while a reverse shift can be noted with the codoping amount increasing to 9 mol% Li + , indicating that the codoped Li + enables the crystal field environment of Eu 3+ to be changed. The excitation and luminescence intensities of all peaks indexed to Eu 3+ have enhanced apparently when codoped with 7 mol% Li + ions. The lifetime of the 5 D 0 state of Eu 3+ ions is also increased by introducing 7 mol% of Li + ions.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 24
·1-11
·
IF 2.8
Chen Yonglin,Wu Haoyi,Li Yanmei,Liu Zhenpeng,Wan Jiangyun,Hu Yihua
A series of novel orange-red emitting tantalate phosphors, Sr 2 Ta 2 O 7 :xEu 3+ (0.01 ≤ × ≤ 0.13) were successfully prepared through the solid-state method at high temperature. Under the excitation of 464 nm, Sr 2 Ta 2 O 7 :Eu 3+ emits orange-red light at 597 nm. The PL spectra of Sr 2 Ta 2 O 7 :Eu 3+ phosphors are ascribed to the 5 D 0 → 7 F J ( J = 0, 1, 2, 3 and 4) transitions of Eu 3+ ions. The optimal doping concentration of Eu 3+ ions was 9 mol%. The optical bandgap of the host was calculated by ultraviolet-visible diffuse reflection spectra (DRS) with a value of 4.73 eV. The emission intensity of phosphors at 423 K still maintains 92% of that at room temperature, which means the material has excellent thermal stability. The chromaticity coordinates of the Sr 2 Ta 2 O 7 :Eu 3+ located in the orange-red region (0.6403, 0.3585). Various results show that Eu 3+ -doped Sr 2 Ta 2 O 7 phosphors have great potential in the field of phosphor conversion white light-emitting diodes (pc-WLEDs).
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高影响因子
LUMINESCENCE
·
2023
·Vol. 38
·期 2
·208-215
·
IF 2.9
Hui Wang,Lingling Wang,Meihua Wu,Minghao Fang,Zhaohui Huang,Xin Min
This paper reports a sequence of a Ca 3 YAl 3 B 4 O 15 :xEu 3+ red phosphor prepared using a high-temperature solid-state reaction. At the excitation of 396 nm, the samples emitted intense red emission centred at ~623 nm, which could be attributed to the 5 D 0 → 7 F 2 transition of the Eu 3+ ion. The results showed that the optimum Eu 3+ doping concentration of Ca 3 YAl 3 B 4 O 15 :Eu 3+ phosphor was x = 80 mol%, and the concentration quenching mechanism of Ca 3 YAl 3 B 4 O 15 :Eu 3+ red phosphor belonged to the exchange coupling between Eu 3+ ions. The Commission Internationale de l'éclairage (CIE) coordinates and colour purity of Ca 3 Y 0.2 Al 3 B 4 O 15 :0.8Eu 3+ were calculated as (0.6375, 0.3476) and 95.5%, respectively. Moreover, the red emission of the obtained phosphor Ca 3 YAl 3 B 4 O 15 :0.8Eu 3+ exhibited a low thermal quenching behaviour with an intensity retention rate of 92.85% at 150°C. The above results manifest that the Eu 3+ -activated Ca 3 YAl 3 B 4 O 15 phosphor is predicted to be a promising red luminescent component for white light-emitting diodes.
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高影响因子
RARE METAL MATERIALS AND ENGINEERING
·
2014
·
IF 0.153
Zhiqiang Zhou,Guo Li,Peiyun Jia
GdVO 4 :Eu 3+ nanophosphors were prepared via molten salt synthesis. Equal moles of NaNO 3 and KNO 3 were used as reaction medium, rare earth nitrates and NH 4 VO 3 as precursors, and NaOH as alkalizer. X-ray diffraction (XRD), Fourier transform infrared (FT-IR), transmission electron microscopy (TEM), photoluminescence (PL) spectrum and lifetime were used to characterize the nanophosphors. XRD demonstrates that NaOH concentration and the sintering temperature play important roles in the crystallinity and the phase purity of the products. The optimum NaOH concentration and sintering temperature are 2:40 and 400 °C, respectively. TEM micrographs show that the GdVO 4 :Eu 3+ nanocrystals exhibit a cubic morphology and have a mean size of about 20 nm, which is in good agreement with that calculated by Scherrer's formula. Both the cell parameters and the volume of GdVO 4 :Eu 3+ nanocrystals decrease due to the existence of big quantity of dangling bonds on the particle surface. Upon excitation at 315 nm, the GdVO 4 :Eu 3+ nanocrystals show the strong characteristic emission of Eu 3+ , which indicates the efficient energy transfer from VO 4 3- groups to Eu 3+ . The best doping concentration of Eu 3+ in GdVO 4 is determined to be 5 mol%.
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高影响因子
POLYHEDRON
·
2025
·
IF 2.6
Yifeng Liu,Yifei Liu,Meihua Wu,Yuena Jiang,Zhaohui Huang,Xin Min,Ruiyu Mi
Red phosphors with good luminescent properties have attracted widespread attention because they can satisfy the lighting requirement of white LEDs (Light Emitting Diode) preferably. K 2 ZnP 2 O 7 : Eu 3+ powder with a stable structure was successfully synthesized via the high-temperature solid-state method, involving a two-step process: pre-sintering at 450 °C for 12 h followed by sintering at 650 °C for 8 h. Under the excitation of 394 nm near ultraviolet light, the phosphor produces bright red emission. The highest emission peak of the K 2 Zn (1–1.5x) P 2 O 7 : xEu 3+ (x = 0.1) phosphor is located at 595 nm ( 5 D 0 → 7 F 1 ), followed by the red emission peak at 612 nm ( 5 D 0 → 7 F 2 ). When the temperature reaches 150 °C, the emission integral intensity of K 2 ZnP 2 O 7 : 0.1Eu 3+ remains 91.1% of that at room temperature (ΔE = 0.1946 eV), which proves that K 2 ZnP 2 O 7 : Eu 3+ has good thermal stability. In addition, the CIE (International Commission on Illumination) coordinates of the white LED packaged by K 2 ZnP 2 O 7 : 0.1Eu 3+ are (0.3312,0.3578), and the CCT (Correlated Color Temperature) and CRI (Color Rendering Index) of the LED lamp are 5765 K and 87.6, respectively. This indicates that K 2 ZnP 2 O 7 :Eu 3+ is promised as a red-emitting phosphor for white LED excited by near-ultraviolet chips.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Bowen Chen,Chenxia Li,Degang Deng,Fengping Ruan,Ming Wu,Le Wang,Yanting Zhu,Shiqing Xu
In this study, Eu 2+ /Eu 3+ coexisting perovskite LaAlO 3 phosphors were synthesized by a traditional high-temperature solid-phase reaction method and investigated via X-ray diffraction data, X-ray photoelectron spectroscopy and temperature-dependent photoluminescence spectra. The Eu 2+ /Eu 3+ coexisting LaAlO 3 phosphors exhibit excellent optical temperature sensing characteristics and are potential inorganic materials for temperature detection. The measured maximal absolute temperature sensitivity reaches 0.014 K -1 , and the corresponding largest relative temperature sensitivity is 1.193% K −1 , which are superior to most of previous reports of that. Meanwhile, the monitored signal peaks are well separated, providing a good signal discriminability. The energy level crossover relaxation of Eu 2+ and Struck-Fonger crossover process involving O 2– -Eu 3+ charge transfer band were used to explain the different temperature-dependent responses of Eu 2+ and Eu 3+ . This work may give new ideas for the future research of optical thermometric materials with high sensitivity and high discriminability.
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高影响因子
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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