Materials Research Express
·
2021
·Vol. 8
·期 10
·105002
·
IF 1.62
Wenchang Xi,Pan Jian,Xisong Mao,Deyang Ning,Xuewen Xia,Guohua Liu,Dongyang Shi,Yuanpei Lan
In this work, aiming to evaluate and compare the luminescent property of Eu3+ doped La(OH)3 nanorods and its decomposed compounds of LaOOH and La2O3, La(OH)3: Eu3+ nanorods were synthesized and the decomposition behaviors in air and hydrogen were revealed. Then the luminescent property of 0%–8% Eu3+ doped La(OH)3 nanorods and the 300 °C–800 °C calcined La(OH)3: Eu3+- 4% were studied. Results show that LaOOH is intermediate product during the degradation of La(OH)3 in air or H2, which can be formed at a temperature range in 372.3 °C–592.9 °C in air. Intensity of emission spectra of La(OH)3: Eu3+ nanorods increases with the rising of Eu3+ dopant concentration, and the emission property of Eu3+ doped LaOOH and La2O3 is varied and strengthened with that of La(OH)3: Eu3+. Luminescent matrixes of LaOOH and La2O3 show similar emission spectrum and intensity, and the transitions of the D0 → 7F1 and D0 → 7F2 of Eu3+ each bifurcate into two peaks for both europium (III) doped La2O3 and LaOOH. The revealed results suggest that LaOOH is a relative thermal-stable compound and should be an appropriate matrix as similar as La2O3 for luminescent applications.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Journal of Applied Spectroscopy
·
2020
·Vol. 87
·期 4
·753-757
·
IF 0.71
Sun J.,Li Q.,Zhou Q.
Eu 3+ -doped NaLaMo 2 O 8 phosphors were synthesized by a conventional solid-state reaction. The phase and luminescent properties of the synthesized phosphors were investigated in the current work. In NaLaMo 2 O 8 , Eu 3+ ions replace La 3+ ions and form solid compound. This substitution induces the 2θ angles of diffraction peaks to shift to larger values. Under excitation at 395 nm, NaLaMo 2 O 8 :Eu 3+ phosphors exhibit emission bands in the range of 550–725 nm originating from 5 D 0 → 7 F J transitions (J = 0, 1, 2, 3, 4) of Eu 3+ . The strongest emission band corresponds to the 5 D 0 → 7 F 2 transition, which indicates a site of Eu 3+ without inversion symmetry in NaLaMo 2 O 8 . The Eu 3+ concentration has obvious influence on the luminescent properties of NaLaMo 2 O 8 :Eu 3+ phosphors. NaLaMo 2 O 8 :6 mol%Eu 3+ has the strongest excitation and emission intensities.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Zheng-Bin Tang,Cai-Li Xu,Xun-Rong Wei,Xin-Guo Zhang,Yi-Bo Chen
Developing high brightness, high color purity and thermal stable red phosphors has gained an increasing attention for enhancing the performance of white light emitting diodes (w-LEDs). Herein, a series of red-emitting KBaY 1−x Eu x Si 2 O 7 (0 < x < 1) solid-solution phosphors were designed and fabricated. The phosphors can be excited by 394 nm near-UV light and emit red light peaking at 612 nm due to the 5 D 0 → 7 F 2 transition of Eu 3+ . The increasing proportion of Eu 3+ in the solid-solution system can improve the photoluminescence intensity and thermal stability of the phosphors continuously until the Eu 3+ concentration comes to 100%, while no deformation of the crystal structure has been brought. The as-prepared KBaEuSi 2 O 7 phosphor shows excellent thermal photoluminescence stability, its emission integrated intensity can still maintain ∼90% of the initial value at room temperature when heating to 180 °C. The CIE coordinates (0.652, 0.348) of KBaEuSi 2 O 7 phosphor are very close to the NTSC (National television system committee) standard red chromaticity (0.67, 0.33), and the color shift at high temperature is very slight. The KBaEuSi 2 O 7 phosphor can be regarded as a promising red luminescence candidate for w-LEDs.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 5
·5821-5830
·
IF 2.478
Hu Peng,Deng Zhaoping,Wang Teshen,Li Zepeng,Ma Yanlin
In this study, a series of Eu 3+ -doped NaBaBi 2 (PO 4 ) 3 red phosphors were synthesized by high-temperature solid-phase reaction method, and the phase structure and photoluminescence properties of the samples were investigated in detail. All the diffraction peaks of the phosphors with various Eu 3+ concentrations are well matched with the NaBaBi 2 (PO 4 ) 3 standard phase, indicating that Eu 3+ ions have no effect on the host structure. Under the excitation of 391 nm wavelength, the emission spectra consisted of four characteristic emission peaks at 595, 617, 656 and 703 nm, respectively. The strongest emission peaking at 617 nm originates from the 5 D 0 → 7 F 2 electron transitions of Eu 3+ ions. The optimum concentration of Eu 3+ ions in NaBaBi 2 (PO 4 ) 3 :Eu 3+ is 9% concentration. The phosphor exhibits strong absorption capacity in the near-ultraviolet region. The Commission International de I’Eclairage chromaticity coordinates of the NaBaBi 2 (PO 4 ) 3 :Eu 3+ samples are located in the red region, indicating that the phosphors are suitable red component to applied in near-ultraviolet-based white light-emitting diodes.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
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.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
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.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2017
·
IF 1.815
Yuguo Yang,Jing Li,Bing Liu,Yuanyuan Zhang,Xianshun Lv,Lei Wei,Xuping Wang,Jianhua Xu,Huajian Yu,Yanyan Hu,Huadi Zhang,Ling Ma,Jiyang Wang
A series of YAG:Ce 3+ /Eu 3+ , YAG:Ce 3+ /Eu 3+ /Bi 3+ and YAG:Ce 3+ /Gd 3+ phosphors were synthesized by a co-precipitation method. The results suggest that all of phosphors have the cubic phase and nearly spherical morphology. However, the red emission can be produced by codoping Eu 3+ and Eu 3+ /Bi 3+ ions in YAG:Ce 3+ , and the codoped Gd 3+ ions can induce the red-shift of Ce 3+ emission. These results suggest that the Eu 3+ , Eu 3+ /Bi 3+ and Gd 3+ ions can be used to decrease the correlated color temperature and increase the color-rendering index of white light-emitting diodes based on InGaN blue chip and YAG:Ce 3+ phosphors.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2015
·Vol. 99
·期 3
·881-887
·
IF 2.61
Meichao Gao,Dafeng Zhang,Xipeng Pu,Xin Shao,Hong Li,Dongdong Lv
Eu 3+ -doped BiOCl with different doping concentrations was synthesized by a simple combustion method. The as-synthesized photocatalysts were characterized by X-ray diffraction, scanning electron microscope, transmission electron microscope, Raman spectroscopy, X-ray photoelectron spectroscopy, electron paramagnetic resonance spectroscopy, and UV–vis diffuse reflectance spectroscopy. The experimental results show that Eu 3+ was successfully doped into the lattice of BiOCl. The as-synthesized Eu 3+ -doped BiOCl photocatalysts show a more intense continuous absorption in UV light region, accompanied with decreased energy band gap. Moreover, the Eu 3+ doping leads to the formation of oxygen vacancies, small crystallite size, and high specific surface areas. Compared with pure BiOCl, the Eu 3+ -doped BiOCl photocatalysts exhibits much higher photocatalytic activity for Rhodamine B (RhB) under UV light irradiation. As-obtained Eu 3+ -doped BiOCl can be easily reused with excellent stability. In addition, the mechanism of the improved photocatalytic properties of Eu 3+ -doped BiOCl was discussed in detail.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
MRS Communications
·
2024
·
IF 1.8
Wang Jun,Pan Xuexue,Li Zhirui,Xu Runkai,Zhang Peifeng,Lin Zhirui,Fan Yuliang,Xie Jinjie,Ke Jingping,Supiyeva Zhazira
In the presence of ethylenediaminetetraacetic acid (EDTA), a straightforward hydrothermal method was conceptualized for the purpose of controlling the size and form of the zircon-type tetragonal phase of LaVO 4 :Eu nanostructures. Nanorods and nanosheaves have been selectively obtained by tuning the pH value. In particular, LaVO 4 :Eu nanorods covered by EDTA molecules are soluble in water. In addition, research on photoluminescence has demonstrated that Eu 3+ -doped LaVO 4 nanorods exhibit significant red emission when exposed to ultraviolet light. This phenomenon has the potential to be utilized in a variety of disciplines, including visual display, catalysis, and biological imaging. Graphical abstract
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yu-Xi Bi,Dan Zhao,Shao-Jie Dai,Rui-Juan Zhang,Qing-Xia Yao
Ion doping is one of the most effective strategies to induce interesting luminescence properties of materials. In this work, the Bi 3+ and Eu 3+ are introduced into a ‘114’ host material YBaZn 3 GaO 7 (YBZG) to generate photoluminescence (PL), long-persistent luminescence (LPL) and colour change properties. The co-doped YBZG:0.003Bi 3+ / y Eu 3+ can generate multi-color emissions from green, through yellow to orange with the increasing of Eu 3+ concentration. There are F-like color centers around conduction band (CB) of YBZG host with shallow or deep energy levels. The electrons trapped by deep levels response to the PC properties, whereas these for shallow levels response to the LPL properties. The PC process from white to apricot is reversible. By alternating thermal treatment and irradiation, YBZG:0.003Bi 3+ was proved to have a good fatigue resistance of 3.1 %. For YBZG:0.003Bi 3+ /0.05Eu 3+ , it shows bright orange LPL emission when the irradiation is removed after 24 min. The achievement of this paper provides a design idea that if the host structure of a phosphor is of flexible and easy to occur defect, not only PL property, but also PC and LPL properties are probably able to realize.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 102
·期 9
·5243-5252
·
IF 3.094
Mengmeng Lun,Wei Wang,Zhifeng Xing,Zhong Wan,Wanying Wu,Hanzhao Song,Yinzhen Wang,Wei Li,Benli Chu,Qinyu He
The Eu 3+ -modified Bi 0.5 Na 0.5 TiO 3 (BNT) ceramics have been fabricated by the solid-state reaction method. The impact of Eu 3+ doping on the structure, photoluminescence, and electrical properties has been studied by XRD, SEM, PL spectra, and LCR meter. X-ray diffraction analysis reveals that the crystal structure of the samples is well matched with the trigonal perovskite, and the optimal temperature of presintering is 880°C. The Eu 3+ -doped BNT ceramics show excellent red fluorescence at 614 nm corresponding to the 5 D 0 → 7 F 2 transition of Eu 3+ under 466 nm excitation and relatively long fluorescence lifetime. The BNT-0.02Eu ceramic density is up to 5.68 g/cm 3 and the relative density is up to 94.6% with sintering temperature 1075°C. The piezoelectric constant (d 33 ) of samples has been significantly improved up to 110 pC/N by Eu 3+ doping. The BNT-0.03Eu ceramic presintered at 880°C and sintered at 1050°C has good dielectric properties and excellent luminescence properties. Eu 3+ -doped BNT ceramics make it potential applications for novel integrated electro-optical and multifunctional devices.
研究领域:
材料科学
·
光学
·
电子工程
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2019
·Vol. 21
·期 26
·3939-3947
·
IF 3.382
Wenpeng Xia,Jie Xiong,Li Jiang,Rui Ye,Yini Mao,Shanshan Hu,Jun Yang
KYb3F10:Ln3+ (Ln = Er, Ho, Tb, Gd, Eu, Sm, Ce and La) micro/nanocrystals with abundant morphologies were synthesized via a one-step hydrothermal route without employing any surfactants. Furthermore, the homogeneous and well-defined KYb3F10 crystals with truncated tetragonal bipyramidal, nanoparticle, nanospherical, microtubular and rugby ball shapes were achieved by manipulating the different environments of crystal growth, such as increasing the concentration of F−, adjusting the pH, using different fluorine sources and adding trisodium citrate. XRD, SEM, EDS and PL as well as lifetime analysis were used to characterize the products. The obtained KYb3F10:Ln3+ products showed bright emission colors red (Eu3+) and green (Tb3+), respectively. It has been found that larger crystal shapes/sizes can greatly enhance their luminescence properties and lifetimes due to their high crystallinity and few defects on the crystal surface. The as-synthesized KYb3F10:Eu3+/Tb3+ products might be potentially applied in multicolor lighting and displays.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）