CRYSTAL GROWTH & DESIGN
·
2025
·
IF 3.4
Kaiting Wu,Pengju Xia,Chengyu Ni,Wanyuan Li,Man Xu,Wubin Dai
In pursuit of illumination-grade wLEDs, innovative red-emitting phosphors with sufficient luminance and thermal stability are required. Herein, a Eu3+-incorporated Ba2CaB2Si4O14 (BCBS) phosphor, exhibiting relatively low efficiency, poor thermal stability, and red line peak photoluminescence (PL) at 614 nm, is preliminarily obtained as a result of Eu3+ 4f–4f transitions. The Rietveld refinements and density functional theory (DFT) calculations indicate that Eu3+ is energetically favored in Ca2+ sites. To overcome the above issues of BCBS: Eu3+, heterovalent Dy3+ is codoped into the phosphor to simultaneously realize: (i) ultrahigh thermal stability of red PL based on structure tailoring and trap regulation associated with both Dy(Eu)Ca• and VO″ defects. For comparison, by tridoping Na+ at the expense of Dy(Eu)Ca• via Dy(Eu)3+ + Na+ → 2Ca2+, the red PL performance is becoming very bad and even worse than that of BCBS: Eu3+, indicating that Dy(Eu)Ca• plays a major role, though the effect of VO″ cannot be completely ruled out, (ii) energy transfer (ET) from Dy to Eu for enhancing PL efficiency/intensity, and (iii) color-tunable PL, including “warm” white light, by combination of both autologous “cool” white PL from Dy and red emission from Eu. The assembled phosphor-converted white light-emitting diode (pc-wLED), adopting single-phase BCBS: Dy3+/Eu3+ with n near UV (nUV) LED chip via a remote “capping” packaging strategy, is a promising candidate to be applied as a white-emitting phosphor in wLEDs. Meanwhile, due to a strong mutual relationship between the intensity ratios of PL bands from magnetic/electric dipole transitions (EDT/MDT) for either Dy (Y/B) or Eu (R/O) and the crystal field environment, the obviously visual PL color change under distinct pressures in a wide range of pressure fluctuations indicates that the phosphor could also be used as a potentially optical pressure sensor with high sensitivity.
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DOI
高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Xiaoqi Jiang,Jingcheng Huang,Mengting Li,Linjin Li,Yinuo Chen,Jiangfei Chen,Junlun Zhu,Xuedong Wang,He Mei
Detecting tetracyclines' (TC) residues is of great significance for evaluating the food and environmental safety. Herein, we pioneered a reversible-responsive ratiometric fluorometry by integrating the red fluorescence of Eu 3+ /GMP lanthanide coordination polymers (Eu 3+ /GMP LCPs) with the blue fluorescence of an anthracene-based imidazolium ionic liquid (ABIIL). In the presence of TC, the fluorescence of ABIIL was quenched by TC via the inner-filter effect and photoinduced electron-transfer process, but that of Eu 3+ /GMP LCPs was enhanced owing to the antenna effect between Eu 3+ and TC. Based on the reversible variations of the fluorescence signals, a fluorescent assay based on ABIIL-Eu 3+ /GMP LCPs was engineered to detect TC with satisfactory sensitivity and selectivity. A good linearity for TC was acquired from 0 to 50 μM with the detection limit of 3.0 nM and the significant color changes. Therefore, the assay was a promising approach for the visual detection of TC in complex media
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DOI
PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2019
·Vol. 6
·期 10
·2837-2849
·
IF 5.934
Peipei Dang,Dongjie Liu,Guogang Li,Sisi Liang,Hongzhou Lian,Mengmeng Shang,Jun Lin
Recently, controllable photoluminescence tuning by devising a solid solution framework, adjusting the valence mixing of Eu2+/Eu3+ and designing efficient energy transfer between activator ions has been extensively investigated and reported due to its significant advantages in the improvement and regulation of the luminescence performances of white light-emitting diodes (W-LEDs). In this study, we designed a series of novel Eu2+-doped (1 − x)Ca3(PO4)2–xCa9Y(PO4)7 (x = 0–1.0) isostructural solid solution phosphors with a β-Ca3(PO4)2-type structure, and powder samples were prepared via the traditional high-temperature solid-state reaction process. The crystal field variation around the Eu2+ ions causes superposition of linear luminescence and induces optical property tuning with a change in the solid solution ratio, x, values. Besides the high-energy emission peak at 418 nm in Ca3(PO4)2:0.03Eu2+, another low-energy emission peak at 486 nm was observed with the formation of the solid solution. Moreover, the corresponding high-energy emission peaks shifted from 418 to 430 nm, and the luminescence intensity of the low-energy emission at 486 nm increased with an increase in x, which was attributed to the combined effect of crystal field splitting of the local lattice and superposition of linear luminescence. In addition, tunable emission across the whole white light region could be realized by constructing a solid solution and adjusting the overall Eu concentration in (1 − x)Ca3(PO4)2–xCa9Y(PO4)7:Eu (x = 0.5, 0.7, 0.9, and 1.0), and the corresponding luminescence mechanisms have been proposed and discussed in detail. In the pursuit of precise color tuning, we also tested the Eu2+ → Mn2+ energy transfer in different compositions (x = 0.2, 0.5, 0.7, and 0.9) of the solid solution phosphors, and successive emission tuning from the blue and cyan range and then the red range was successfully achieved. Finally, the temperature-dependent photoluminescence and decay time were revealed systematically, and the corresponding mechanisms for the thermal quenching behavior have been discussed. This study provides a new perspective for color tuning originating from the simultaneous isostructural solid solution, valence mixing of Eu2+/Eu3+ and efficient energy transfer.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Ce Li,Xu Zhang,V.C. Onah,Weiling Yang,Zhuang Leng,Xiliang Jiang,Fangming Zhang,Shasha Li,Yong Zhang,Yu Han,Huisheng Liu,Chun Li,Dingfu Zhou,Fanming Zeng
In analyzing the effect of alkali metal and alkaline earth metal oxide on the properties of tellurite glass , a series of tellurite glass samples doped with alkali metals and alkaline earth metals were prepared based on the TeO 2 -WO 3 -GdF 3 glass system by melt quenching method. Through tests and comprehensive analysis, the results show that after the F − ions successfully enter the glass network, the substitution of TeO 2 by alkali and alkaline earth metals could reduce the molar volume , which means the glass becomes more compacted. The influence on the glass network is mainly shown in [TeO 3 ] and [TeO 4 ] units. Alkali metals and alkaline earth metals could increase the asymmetry of the TWG: Eu 3+ glass network, shorten the critical distance, and increase luminescence intensity by 8.6 times and improve color purity to 94%. In addition, alkali metals could prolong the fluorescence lifetime , while alkaline earth metals could shorten it. Te 4+
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DOI
高影响因子
Environmental Science-Nano
·
2022
·Vol. 9
·期 5
·1712-1723
·
IF 9.473
Mengqi Huang,Changlun Tong
A dual-emission ratiometric fluorescence probe for the simultaneous detection of tetracycline (TC) and Fe3+ in aqueous solution was fabricated based on a boron-doped carbon quantum dot (B-CQD)/CdTe–Eu3+ composite. Green-emitting CdTe QDs were modified by Eu3+; the fluorescence of CdTe QDs was quenched owing to the aggregation via Eu3+ and could be restored by the addition of TC. The fluorescence response of CdTe–Eu3+ is quite sensitive and selective to TC, which can be used as a turn on–off–on fluorescence probe for ultrasensitive and selective detection of TC. By introducing the blue-emitting B-CQDs with specific fluorescence response to Fe3+, a dual-emission ratiometric fluorescence probe of B-CQD/CdTe–Eu3+ was thus fabricated for the simultaneous detection of TC and Fe3+. At the excitation wavelength of 270 nm, the dual-emission fluorescence peaks are at 410 and 530 nm. A good linearity between the fluorescence intensity ratio (F530/F410 or F410/F530) and the concentrations of TC and Fe3+ in the range of 0.01–2.0 μM for TC and 0.1–15.0 μM for Fe3+ was shown. The limits of detection (LODs, 3σ/k) are ultrasensitive for TC (4.2 nM) and Fe3+ (53.0 nM). The dual-emission ratiometric fluorescent probe was successfully applied for the simultaneous determination of TC and Fe3+ in environmental water samples. The possible luminescence and fluorescence quenching/restoring mechanisms of the composite probe were also discussed in detail. This study can provide a new approach for fabricating a multifunctional fluorescent probe and a prospective application in environmental and food analysis.
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DOI
高影响因子
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