CERAMICS INTERNATIONAL
·
2019
·Vol. 46
·期 3
·2845-2852
·
IF 3.45
Quansheng Wu,Quan Zhao,Penghui Zheng,Wenbo Chen,Dongfeng Xiang,Ziyu He,Qiang Huang,Jianyan Ding,Jiangcong Zhou
Lithium-containing silicate compounds have attracted so much attention in recent years for applications in energy storage and illumination source due to their rigid structure and good electrical conductivity . In this study, a Eu 3+ doped lithium-containing silicate red phosphor , Li 2 Ca 4 Si 4 O 13 :Eu 3+ , was explored by using structural computational simulations and systematic experiments for multifunctional applications. As a result, due to the quite non-central symmetry of the Ca 2+ sites (C 1 symmetry), the strong 4f-4f excitations in near ultraviolet region were observed. Under near ultraviolet and cathode ray light excitation , Li 2 Ca 4 Si 4 O 13 :Eu 3+ phosphor has an efficient red emission with good thermal stability and ageing resistance. Furthermore, Li 2 Ca 4 Si 4 O 13 :Eu 3+ phosphor exhibits a concentration-sensitive behavior induced by the change of site symmetry. The results show that it is feasible to develop near-ultraviolet and cathode ray light excited red phosphors in lithium-containing silicate compounds.
研究领域:
材料科学
·
无机化学
·
固体物理
·
光电功能材料
·
发光材料
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Weimin Jiang,Shengwei Guan,Chuangyu Wang,Mengxin Chen,Zengming Qin,You Li,Hongwei Ding,Feng Wang
A series of NaLu(MoO 4 ) 2 (NLMO): Sm 3+ phosphors and Sm 3+ , Eu 3+ co-doped NLMO phosphors were synthesized by high-temperature solid-state method. Their crystal structures and luminescent properties were systematically characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), fluorescence spectroscopy, fluorescence lifetime, and temperature-dependent emission spectroscopy. XRD results confirm that Sm 3+ and Eu 3+ are successfully doped through isovalent substitution of Lu 3+ sites without destroying the pure NLMO phase structure. Under 405 nm near-ultraviolet excitation, the optimal doping concentration of Sm 3+ is 0.04 mol, and the concentration quenching mechanism is dipole-dipole interaction. Efficient Sm 3+ →Eu 3+ energy transfer is observed in the co-doped system, which is further verified by the fluorescence lifetime measurement of Sm 3+ . The maximum energy transfer efficiency reaches 81%, with the dominant mechanism identified as dipole-dipole interaction. The NLMO:0.04Sm 3+ ,0.07Eu 3+ phosphor exhibits excellent thermal stability, retaining 81% of its emission intensity at 303 K when heated to 383 K, and the thermal quenching activation energy is as high as 0.331 eV. CIE chromaticity coordinates show that the emission color of the phosphor gradually shifts from orange-red to red with increasing Eu 3+ doping concentration, and the correlated color temperature is observed between 1753 K and 2339 K. These results demonstrate that the NLMO:Sm 3+ , Eu 3+ phosphor integrates high energy transfer efficiency, outstanding thermal stability, and precise color tunability, making it an ideal red component for near-ultraviolet excited white light-emitting diodes with significant practical application value.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Xiaopeng Hu,Anlin Zhang,Huapeng Sun,Fanhua Zeng,Yanhua Lei,Lianwu Xie,Ruijin Yu,Bin Deng,Huihong Lin
Novel red-emitting phosphors, Sr 3 LaTa 3 O 12 :Eu 3+ (SLTO:Eu 3+ ), have been successfully synthesized for use in white light-emitting diodes (w-LEDs) and latent fingerprint (LFP) visualization applications. The crystalline structure, bandgap, and photoluminescence (PL) of the SLTO:Eu 3+ phosphors were thoroughly investigated. Under 395 nm excitation, SLTO:Eu 3+ phosphors emitted orange-red light at the wavelength of 616 nm due to the 5 D 0 - 7 F 2 transition of Eu 3+ ions. The optimal doping concentration of the phosphor is x = 0.30 and the neighbor ions interaction is the most critical factor in the concentration quenching mechanism of the SLTO:Eu 3+ phosphor. Furthermore, the SLTO:0.30Eu 3+ phosphor exhibit higher thermal stability compared to the conventional red phosphor (Sr 2 Si 5 N 8 :Eu 2+ ). The packaged w-LED showed a correlated color temperature (6887 K), excellent color rendering index (95), and Commission International de l'Eclairage (CIE) coordinates of (0.305, 0.334). The SLTO:0.30Eu 3+ phosphor effectively detected level 1–3 structures of LFPs under ultraviolet irradiation , and ultimately detected LFPs in various daily life circumstances. These findings indicate that the SLTO:0.30Eu 3+ phosphor might be a viable option for w-LED lighting applications and LFPs visualization.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Yufeng Du,Yuxin Li,Yixuan Zhao,Xinyu Zhang,Changlin Li,Ruiqi Yang,Zhequan Zou,Jingjing Lian,Jinyou Duan,Huihong Lin,Ruijin Yu
A new series of red luminescent Cd 2 MgTeO 6 : x Eu 3+ ( x = 0.5–50 mol%) phosphors was successfully synthesized through a high-temperature solid-phase reaction at 1000 °C. The synthesized phosphors were investigated for their phase purity, surface morphology , elemental distribution, and luminescence properties. Strong orange-red light emission (617 nm) was observed upon excitation at 398 nm, which was attributed to the electric dipole 5 D 0 - 7 F 2 transition of Eu 3+ . The optimal doping concentration was found to be x = 20 mol%. Concentration quenching mechanism was identified as the interaction of near-neighbor ions. The chromaticity coordinates of all the Cd 2 MgTeO 6 :Eu 3+ samples were found to be located in the red region and were almost the same. The Cd 2 MgTeO 6 : 20 mol%Eu 3+ phosphors exhibited an unusual thermal quenching behavior, maintaining 102% of the initial intensity, thus possessing excellent thermostability. Moreover, the manufactured white light diode demonstrated a good color rendering index ( R a = 89) with the coordinates of (0.344, 0.330) by the Commission International de L'Eclairage (CIE). Additionally, the Cd 2 MgTeO 6 : 20 mol%Eu 3+ phosphor was surface-functionalized with oleic acid (OA) (Cd 2 MgTeO 6 : 20 mol%Eu 3+ @OA) to aid in the identification of Level I-III fingerprint details with high resolution and contrast. Good visualization of the latent fingerprint (LFP) was observed on different substrates. Therefore, Cd 2 MgTeO 6 :Eu 3+ phosphors hold great promise for the visualization of w-LEDs and LFPs.
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Hongyang Du,Ge Zhu,Zhuowei Li,Shanshan Li,Ming He,Zhenhua Bi,Shuangyu Xin
In this work, we reported the synthesis and characteristic luminescence of an orange-red emitting phosphor NaBa 10 Y 5 W 4 O 30 : Eu 3+ for ultra-violet white light emitting diodes. The phase compound, crystalline structure and morphology are analyzed. The results indicate that a heavy doping of Eu 3+ ( x = 50%) is realized in NaBa 10 Y 5-5 x W 4 O 30 : x Eu 3+ without any impurity phase. Moreover, the optical band gap is analyzed by diffuse reflectance spectroscopy and further confirmed by density function theory (DFT). Meanwhile, the as-synthesized NaBa 10 Y 5 W 4 O 30 : Eu 3+ phosphor can be efficiently pumped by strong broad-band excitation around 315 nm due to the charge transfer transition from [WO 6 ] 6- groups to Eu 3+ . Owing to the highly symmetric lattice environment of Eu 3+ in YO 6 sites, a strong orange-red emission at 596 nm with color purity of 95.34% is obtained, corresponding to the 5 D 0 → 7 F 1 magnetic dipole transition of Eu 3+ ions. The critical concentration is obtained to be x = 15%, and the quenching mechanism is discussed to be dipole–dipole interaction. Furthermore, the temperature dependent emission behavior are analyzed, and the thermal quenching mechanism are explained by the variable temperature decay curve and configuration coordination diagram. Finally, an orange-red light emitting diode lamp is fabricated based on NaBa 10 Y 5 W 4 O 30 : 15%Eu 3+ phosphor and 315 nm semiconductor chip. In summary, the results indicate that NaBa 10 Y 5 W 4 O 30 : Eu 3+ phosphor has the potential to be an orange-red phosphor for white light emitting diodes.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF RARE EARTHS
·
2022
·
IF 4.632
Mingze Zhang,Lin Lin,Zhuohong Feng,Zhezhe Wang,Yuanming Yang,Wenjun Ma,Jieyi Cai,Pan Lu,Siyi Jia,Zhiqiang Zheng
In this work, catena-[(μ-benzene-1,3,5-tricarboxylato)-(1,10-phenanthroline)-( N , N -dimethylformamide)-gadolinium(iii)- N,N -dimethylformamide solvate] (denoted as Gd-MOF) co-doped with Eu 3+ and Dy 3+ was successfully synthesized. The entire X-ray diffraction peaks of the sample match well with the Gd-MOF phase. A detailed characterization by inductively coupled plasma mass spectrometry (ICP-MS) shows that the actual concentration is basically consistent with the design concentration. The temperature sensing properties of Gd-MOF:Eu 3+ ,Dy 3+ were analyzed by temperature-dependent fluorescence spectra from 213 to 453 K. As temperature rises, the emission color of Gd-MOF:Eu 3+ ,Dy 3+ changes from yellow to red. The relative sensitivity reaches a maximum of 5.87%/K at 383 K in the Gd-MOF:1%Eu 3+ ,30%Dy 3+ sample. The high relative sensitivity of this MOF is due to the phonon-assisted energy transfer from Dy 3+ to Eu 3+ , which is proved via fluorescence decay curves and fluorescence spectra. The major route of this energy transfer is 4 F 9/2 (Dy 3+ ) → 5 D 1 (Eu 3+ ).
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Xianju Zhou,Shouchun Zhao,Siyu Li,Yongjie Wang,Li Li,Sha Jiang,Guotao Xiang,Chuan Jing,Jingfang Li,Lu Yao
In this study, a series of NaLaCaWO 6 : Eu 3+ phosphors were synthesized by traditional high-temperature solid-phase method. The doping concentration of Eu 3+ was explored when the phosphors had the best luminescence performance, and the quenching concentration of Eu 3+ could reach 30%. The mechanism of concentration quenching is due to electric dipole-electric dipole interaction . The CIE coordinates of the phosphor are (0.66, 0.34), which are close to the standard red region of National Television Standard Committee (NTSC). Therefore, the samples could be potentially used as red phosphors of white light emitting diodes . The optical thermometry properties of NaLaCaWO 6 :30%Eu 3+ phosphors in 298–523 K were studied through temperature-dependent excitation spectra. The results demonstrate negative thermal quenching at the edge of the charge transfer band (CTB) with a red shift of the center of this band as temperature arises. Derived from the excited state of CTB , an optical temperature sensing strategy is proposed, and the relative sensitivity achieves 2.23%/K −1 .
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yu-Fei Zhong,Guang-Ming Bao,Mei Qiu,Yi-Fan Xia,Wei Li,Ying-Qing Tao,Si-Yi Liu,Si-Han Li,Wei Xiao,Yongfan Zhang,Hou-Qun Yuan
Monoamine neurotransmitters such as L-epinephrine (EPI), norepinephrine (NE), dopamine (DA), and serotonin (ST) are important biomarkers for neurological diseases. However, specific detection of a single monoamine neurotransmitter is challenging. In this work, a water-stable fluorescent biosensor, Eu 3+ -doped UiO-66 metal–organic framework ( EuUPDC ), is constructed for specific recognition of ST and its metabolite, 5-hydroxyindole-3-acetic acid (5-HI-3-AA). The detection limits of EuUPDC for ST and 5-HI-3-AA are 0.013 μM and 0.15 μM, respectively. The LOD value for ST is 10-fold improvement compared to the reported fluorescent sensors. Importantly, the biosensor specifically recognizes ST at very low concentrations in the presence of co-existing monoamine neurotransmitters. Furthermore, the EuUPDC biosensor is successfully applied for the determination of ST and 5-HI-3-AA in human serum and urine with good recoveries. Finally, a EuUPDC -embedded test strip is fabricated and portable smartphone-assisted RGB color values are effectively integrated with a lowest detectable value of 0.6 μM for ST and 6.7 μM for 5-HI-3-AA. The designed biosensor EuUPDC has great potential for the quantitative determination of ST and 5-HI-3-AA, and applicable for early diagnosis of neurological diseases.
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 36
·12958-12967
·
IF 4
Jiejun Pan,Guang Xu,Sixue Ren,Tingjie Xu,Dongrui Li,Mengxin Liu,Xinan Shi,Daocheng Pan
Rare earth-doped metal oxide thin films exhibit remarkable potential for application in anti-counterfeiting, owing to their exceptional fluorescent properties. However, the existing fabrication techniques for these rare earth-doped luminescent thin films are predominantly complex and necessitate high-temperature conditions. In light of this issue, we present a low-temperature method for in situ fabrication of luminescent Ca1−xMoO4:Eux3+ and Sr1−xMoO4:Tbx3+ nanocrystal thin films by a solution deposition process. The developed method has the advantages of simple operation, rapid and low-temperature synthesis. The optimal chemical compositions of molybdate-based luminescent films are Ca0.90MoO4:Eu0.103+ and Sr0.90MoO4:Tb0.103+. Moreover, we evaluate the practical feasibility of luminescent nanoparticle films in the field of anti-counterfeiting by combining the unique fluorescent properties of rare earth ions and designing customized fluorescent patterns.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LUMINESCENCE
·
2021
·Vol. 37
·期 2
·348-356
·
IF 2.464
Shilin Shen,Zerong Long,Yi Lu,Jia Chen
A novel double-windows fluorescence sensor for carbofuran (CF) detection was successfully developed based on rare-earth Eu,Tb-doped Y 2 O 3 @SiO 2 -based molecularly imprinted nanoparticles (MINs) with a multilayer core-shell structure. The recognition process of the MINs for CF was fairly fast and needed only ~8 min to reach a dynamic equilibrium. Interestingly, one fluorescence attenuation window was found with an increase in CF concentration ( Q ) from 0.1 to 10 μg ml −1 and with a limit of detection (LOD) of 0.04 μg ml −1 at 544 nm belonging to the Tb 3+ emission, as well as another fluorescence enhanced window within the CF concentration range 10–100 μg ml −1 (LOD = 4 μg ml −1 ) at 617 nm of Eu 3+ emission in the dispersed rare-earth-doped MIN colloidal aqueous solution. Luminescence resonance energy transfer from CF to Eu 3+ and an inner filter effect of CF towards Tb 3+ , as well from the two independent detection windows were clearly observed simultaneously. The competition experiment displayed hardly any marked interference during detection of CF following addition of its analogues (carbaryl, isoprocarb, aldicarb, methomyl, and etofenprox). Moreover, the MINs could also be applied to accurately detect CF in rhubarb and wolfberry samples with recoveries of 85.7–92.2%. This sensing system has high specific recognition and a wide detection range for CF and provides new opportunities for pesticide detection.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 37
·12730-12739
·
IF 6.4
Zaixin Long,Shuxin Li,Wenfei Shen,Tonghui Li,Yao Wang,Shuhan Guo,Matt J. Kipper,Christopher Davis Snow,Laurence A. Belfiore,Jianguo Tang
At present, down-conversion materials and doping active layer materials are effective means to improve the efficiency and stability of polymer solar cells (PSCs). Herein, environmentally friendly and cost-effective Eu3+-induced diblock polymer aggregates (EIPAs) were synthesized by the self-assembly method, and these aggregates were doped into the active layer of various non-fullerene systems, which optimized the morphology and effectively increased the ultraviolet light absorption in the range of 300–450 nm and converted into secondary emission in the visible range. Upon optimization, devices featuring PM6:IT-4F doped with a concentration of 0.2 mg mL−1 EIPAs exhibited a remarkable improvement in power conversion efficiency (PCE) and stability, with a 10.83% increase compared to binary devices, achieving an impressive PCE of 13.82%. This enhanced performance can be attributed to the significant increase in short-circuit current density (JSC) and fill factor (FF) observed in the doped devices. Similar observations have been made with other EIPA-doped devices, further demonstrating the versatility of EIPAs in improving the overall device performance of PSCs.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Xiaoyong Huang,Shaoying Wang,Jia Liang,Balaji Devakumar
In this work, novel Eu 3+ ions activated red emitting Ca 2 YTaO 6 (CYT) phosphors have been prepared via a high-temperature solid-state reaction approach. Their crystal structure and photoluminescence properties were investigated by X-ray diffraction (XRD) patterns, photoluminescence excitation and emission spectra , and decay lifetimes. XRD Rietveld refinement results revealed that the CYT:Eu 3+ phosphors crystallized in the monoclinic structure with the space group of P 2 1 / n and lattice parameters of a = 5.5989 Å, b = 5.8449 Å, c = 8.1016 Å, α = γ = 90°, β = 89.8799°, and V = 264.625 Å 3 . The CYT: x Eu 3+ phosphors could be excited by near-ultraviolet light around 396 nm, and they showed bright narrowband red emissions peaking at 590, 614, 656, and 703 nm due to the 5 D 0 → 7 F J (J = 1–4) transitions of Eu 3+ ions. The 614 nm red emission corresponding to the 5 D 0 → 7 F 2 transition was dominant in the emission spectra, indicating that the Eu 3+ ions occupied non-centrosymmetric sites. The critical quenching concentration in CYT: x Eu 3+ phosphors was 50 mol%, and the optimal CYT:0.5Eu 3+ phosphors showed PL intensity as great as 4.2 times higher than the commercial red phosphors Y 2 O 3 :Eu 3+ . CIE chromaticity coordinates of CYT:0.5Eu 3+ phosphors were (0.6678, 0.3319), and the color purity reached up to 97.4%. The nonradiative energy transfer between the Eu 3+ ions in the CYT host was attributable to dipole-dipole interaction, and the critical distance was roughly 7.97 Å. A warm white light-emitting diode (w-LED) based on the combination of a 395 nm LED chip with a blend of commercial BaMgAl 10 O 17 :Eu 2+ blue phosphors and commercial (Ba,Sr) 2 SiO 4 :Eu 2+ green phosphors and as-prepared CYT:0.5Eu 3+ red phosphors was fabricated, which gave warm white-light emission with excellent CIE color coordinates of (0.3833, 0.3859), low correlated color temperature of 3991 K, high color rendering index of 92.1, and good luminous efficacy of 21.76 lm/W.
✓ 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）