OPTICAL MATERIALS
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2023
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IF 3.9
Bojun Lin,Yanjie Zhang,Zihan Zhao,Herui Zhao,Jingjie Yu
Eu 2+ /Eu 3+ co-doped Ca 5 (PO 4 ) 3 F (FAP) phosphors with tunable color of red/blue (R/B) emission were successfully synthesized by the two-step method for potential applications in light-emitting diodes (LED). Eu 2+ (or Eu 3+ ) single-doped and Eu 2+ /Eu 3+ co-doped FAP all showed pure hexagonal FAP crystal with space group P6 3 /m, indicating the occupation of Ca sites by Eu 2+ and Eu 3+ ions. Typically, Ca 5 (PO 4 ) 3 F: Eu 2+ phosphors exhibited a broad blue emission band at 451 nm under 293 nm excitation and Ca 5 (PO 4 ) 3 F: Eu 3+ samples emitted strong orange-red light at 596 nm, 615 nm and 620 nm under 394 nm excitation. Further, Eu 2+ /Eu 3+ co-doped FAP phosphors obtained by the two-step method depicted the blue emission at 451 nm (Eu 2+ ions) and the orange-red emission (Eu 3+ ions) at 596 nm, 615 nm and 620 nm with an excitation wavelength of 365 nm (NUV). The tunable R/B ratio from 0.079 to 7.035 with various CIE chromaticity coordinate can be achieved by adjusting the recalcined temperature in the second step. Ca 5 (PO 4 ) 3 F: Eu 2+ , Eu 3+ sample can be packaged with green Lu 3 Al 5 O 12 (LuAG) phosphors by 365 nm chip (1 W) and the cold white light with CIE chromaticity coordinate (0.2815, 0.3485) (CRI: 73, CCT: 7973 K) is achieving. Based on Ca 5 (PO 4 ) 3 F: Eu 2+ , Eu 3+ and 25B 2 O 3 -10SiO 2 -35ZnO-6Li 2 O-12La 2 O 3 -12WO 3 (BS-glass) (in mol%) with strong mechanical strength as a great binder, the remote-excited color convertor (PiG: phosphor in glass) has been fabricated by screen printing technology for NUV-WLED application. Finally, by comparing the working temperature of PiG and pc-WLED at the same operating time, the working temperature of PiG was stable at 32 °C when remote excitation lighting was applied, which greatly avoided the phenomenon of “thermal quenching” for phosphors caused by high temperature under the operating of WLED. Thus, it was demonstrated that Eu 2+ and Eu 3+ co-doped Ca 5 (PO 4 ) 3 F phosphors with tunable red/blue emitting would be a highly potential candidate for NUV-WLED.
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OPTICAL MATERIALS
·
2019
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IF 2.687
Xiaoqing Guo,Shuangju Song,Xue Wang,Xue Jiang,Wenqing Lv,Xiaoya Yu,Yuanyuan Han,Liyong Wang
A novel inorganic dual-functional fluorescent chemosensors CaMoO 4 :Eu 3+ has been prepared via solid-state reaction by the assistance of gum arabic (GA). The fluorescence of as-prepared CMO:Eu 3+ was selectively quenched by Fe 3+ and Cr 2 O 7 2− ions in aqueous, resulting in the simultaneous detection of Fe 3+ and Cr 2 O 7 2− ions. The F − anions can recover the fluorescence when Fe 3+ quenching the fluorescence at 615 nm. Moreover, CMO:Eu 3+ displayed high sensitivity for Fe 3+ and Cr 2 O 7 2− assay and the detection limits were 8.26 and 4.78 μM, respectively. The fluorescence quenching mechanism was ascribed to the competitive adsorption between CMO:Eu 3+ and targets. Results indicated that CMO:Eu 3+ could be a promising candidate in Fe 3+ and Cr 2 O 7 2− ions assay in environmental systems.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2012
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IF 3.07
Qiu-Ping Li,Bing Yan
A series of ternary rare earth (Eu 3+ , Tb 3+ ) complexes are covalently coated to the 3-aminopropyltriethoxysilane functionalized multi-walled carbon nanotube (MWCNT) by a simple in situ sol–gel method by the bifunctional silylated monomer TTA-Si and TAA-Si (TTA-Si and TAA-Si are 3-(triethoxysilyl)propylisocyanate (TEPIC) modified thenoyltrifluoroacetone (TTA) and trifluoroacetylacetone (TAA), respectively). The resulting materials are characterized by Fourier transform infrared spectra, scanning electronic microscope, transmission electron microscope, thermogravimetric analysis, ultraviolet visible diffused reflection measure, photoluminescence spectra, and X-ray diffraction. The photoluminesce measurements indicated that these hybrids exhibit characteristic red and green luminescence originating from the corresponding ternary rare earth ion (Eu 3+ , Tb 3+ ). The luminescence quenching effect of MWCNT networks have been successfully restrained by coating a relatively thicker silica–oxygen-based organic–inorganic complex. Furthermore, the fluorescence lifetimes and emission quantum efficiencies of Eu 3+ hybrid materials are also determined.
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高影响因子
NEW JOURNAL OF CHEMISTRY
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2024
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IF 2.7
Feiyan Xie,Junqiang Gu,Dekang Xu,Qiancheng Xiong,Jinyu Yang,Xiangjian Ou,Dawei Wen
Research into red phosphors with a high color rendering index is particularly compelling, given the absence of a red component in the spectrum of commercial pc-WLEDs, which combine blue LED chips with yellow-emitting YAG:Ce3+ phosphors. Herein, we reported a novel Eu3+ activated Ca3Zn3Te2O12 red-emitting phosphor, synthesized using a conventional high-temperature solid-phase method. The phase and crystal structures were analyzed by powder X-ray diffraction and Rietveld refinement. The optimal excitation peak of the Ca3Zn3Te2O12:Eu3+ phosphor was located at 395 nm, matching those of conventional commercial near-ultraviolet chips. In addition, the Ca3Zn3Te2O12:9%Eu3+ phosphor exhibited good thermal stability, with an activation energy of 0.267 eV, and the CIE color coordinates hardly changed with temperature. Ultimatel, a high-quality white LED device was fabricated by combining Ca3Zn3Te2O12:9%Eu3+ red phosphor, a commercial BaMgAl10O17:Eu2+ blue phosphor, and(Ba,Sr)2SiO4:Eu2+ green phosphor with a 395 nm near-UV chip. Despite a substantial increase in the input current from 20 to 320 mA, the white-LED maintained a stable color rendering index of around 80, highlighting its consistent performance. These results indicated that Eu3+ activated Ca3Zn3Te2O12 phosphors are promising red emission candidates for white LEDs pumped by near ultraviolet chips.
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OPTIK
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2016
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IF 0.742
Renping Cao,Dedong Peng,Haidong Xu,Zhiyang Luo,Hui Ao,Siling Guo,Jingwei Fu
Sr 3 (VO 4 ) 2 :Eu 3+ and Sr 3 (VO 4 ) 2 :Eu 3+ , Li + phosphors are synthesized by solid-state reaction method in air. X-ray diffraction patterns indicate that all samples are pure phase Sr 3 (VO 4 ) 2 . The host Sr 3 (VO 4 ) 2 with excitation 348 nm emits yellow-green light. Emission spectrum of Sr 3 (VO 4 ) 2 :Eu 3+ phosphor with excitation 335 nm contains a broad emission band peaking at ∼540 nm due to V 5+ → O 2− charge transfer and some narrow emission bands owing to the 4 f – 4 f electron transations of Eu 3+ ion in the range of 400–780 nm. With excitation 394 nm, only emision bands derived from Eu 3+ ion are observed. Emission intensity of Sr 3 (VO 4 ) 2 :Eu 3+ phosphor can be improved obviously due to charge compensation and fluxing agent role of Li + ion when Li + ion is co-doped. The optimal Eu 3+ doping concentration is ∼5 mol%. The energy transfer process between [VO 4 ] 3− group and Eu 3+ ion is observed and analyzed by emission spectrum in Sr 3 (VO 4 ) 2 :Eu 3+ phosphor. The luminous mechanism of Sr 3 (VO 4 ) 2 :Eu 3+ phosphor is explained by energy transfer and energy level diagram of [VO 4 ] 3− group and Eu 3+ ion.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2013
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IF 3.172
Yan Zhao,Bing Yan
GaN-functionalized rare earth (Eu 3+ and Tb 3+ ) organic/inorganic mesoporous nanocomposites have been successfully synthesized (designated as RE(L SBA-15) 3 (L GaN); RE = Eu, Tb; L = TAA Si, BTA Si). The organosilane precursor materials (L SBA-15) are synthesized by co-condensation of tetraethylorthosilicate (TEOS) and the functionalized β-diketones (TAA Si and BTA Si) in the presence of Pluronic P123 surfactant as a template. The modified β-diketones ligands are also used to covalently bond with surface-modified GaN and formed another precursor L GaN. Both of the precursors can coordinate with rare earth ions to synthesize the final mesoporous materials via a sol–gel process. FTIR, TEM, XRD, and nitrogen (N 2 ) adsorption/desorption measurements are employed to characterize the mesostructure of RE(L SBA-15) 3 (L GaN). The luminescence properties and thermogravimetric analysis of all the prepared materials are characterized in detail, and the results reveal that a series of uniformed mesopore structure hybrid materials has been achieved. The mesoporous material Eu(BTA Si SBA-15) 3 (BTA Si GaN) has better luminescence intensity, higher quantum efficiency, and longer lifetime than Eu(TAA Si SBA-15) 3 (TAA Si GaN). While the nanocomposite Tb(TAA Si SBA-15) 3 (TAA Si GaN) revealed the strongest characteristic emission of Tb 3+ ions than Tb(BTA Si SBA-15) 3 (BTA Si GaN), the excellent luminescent properties and thermal stability enable the hybrid mesoporous material to have potential applications in optical field.
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高影响因子
JOURNAL OF LUMINESCENCE
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2014
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IF 2.367
Jiansheng Huo,Jiadan Zhu,Shunhua Wu,Haijie Zhang,Qianming Wang
Red emissive phosphors of YTa 1− x Nb x O 4 :Eu 3+ ( x =0–1) have been successfully synthesized by a molten salt method. Powder characteristics were studied by X-ray diffraction, scanning electron microscopy and photoluminescence spectroscopy. The effects of Nb concentration ( x ), flux nature and firing temperature on photoluminescence behavior of YTa 1− x Nb x O 4 :Eu 3+ were extensively investigated. The results showed that the photoluminescence spectra of the samples exhibited strong red emissions (615 nm) upon the ultraviolet excitation and the emission intensities strongly dependent on the host-lattice composition and particle morphology .
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SOLID STATE SCIENCES
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2015
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IF 1.839
Yan-Jing Gu,Bing Yan
A series of organic–inorganic hybrid materials were prepared by linking lanthanide (Eu 3+ , Sm 3+ ) complexes to mesoporous SBA-15/SBA-16 through 8-hydroxybenz[de]anthracen-7-one modified silane (HBA-Si) as linker. The physical characterizations of these hybrids revealed that they all have high surface area, uniformity in mesostructure. The luminescence properties of these covalently bonded materials (denoted as Ln(HBA-SBA-15) 3 phen and Ln(HBA-SBA-16) 3 phen) were compared with ternary complexes (Ln(HBA) 3 phen) (Ln = Eu, Sm). Eu(HBA-SBA-15(16)) 3 phen hybrids display better thermal stability, whose luminescent lifetimes and quantum efficiencies were matchable with those of Eu(HBA) 3 phen complex in spite of its much lower effective condensation of Eu 3+ species. In addition, the luminescent performance of functionalized SBA-15 hybrids was more favorable than that of functionalized SBA-16 hybrids, revealing that SBA-15 was a better host material for lanthanide complex than mesoporous silica SBA-16.
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ACS Applied Materials & Interfaces
·
2024
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IF 8.3
Rui Qi,Wenfei Shen,Rui Xu,Zengkun Li,Zaixin Long,Yao Wang,Qinglin Tang,Matt J. Kipper,Ketul Popat,Laurence A. Belfiore,Jianguo Tang
Eu3+-induced polystyrene-co-poly(acrylic acid) aggregates (EIPAs) were synthesized using a self-assembly approach, and their structures and photophysical characteristics were examined to achieve effective monochromatic red emission in polymer light-emitting diodes (PLEDs). By adjusting the monomer ratio in RAFT polymerization, the size of Eu3+-induced block copolymer nanoaggregates can be regulated, thereby modulating the luminescence intensity. High-performance bilayer polymer light-emitting devices were fabricated using poly(9,9-dioctylfluorene) (PFO) and 2-(tert-butylphenyl)-5-biphenylyl-1,3,4-oxadiazole (PBD) as the host matrix, with EIPAs as the guest dopant. The devices exhibited narrow red emission at 615 nm with a full width at half-maximum (fwhm) of 15 nm across doping concentrations of 1, 3, 5, and 10 wt %. At a doping concentration of 3 wt %, the device achieved a maximum brightness of 1864.48 cd/m2 at 193.82 mA/cm2 and an external quantum efficiency of 3.20% at a current density of 3.5 mA/cm2. These results indicate that incorporating polystyrene-co-poly(acrylic acid) with Eu3+ complexes enhances the excitation and emission intensity, as well as the structural stability of the emitting layer in PLEDs, thereby improving the device performance.
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Applied Materials Today
·
2024
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IF 7.2
Wei Chen,Qinglin Tang,Rui Xu,Jin Liu,Yao Wang,Wei Wang,Yanxin Wang,Christopher D. Snow,Jun Li,Matt J. Kipper,Laurence A. Belfiore,Jianguo Tang
The protection of personal information is becoming increasingly difficult in the age of rapid growth in communication and information technologies. However, current relating techniques, such as anti-counterfeiting, depend on the simple luminescence image and UV–recognition. Thus, advanced methods for information encryption and decryption are urgently required. Herein, we report a full fluorescence paper (FFP) containing stable, fluorescent Eu 3+ –induced diblock nanoaggregates (EIPAs), and design a negative photon information multiple encryption (NME) method. Multiple quenching mechanisms can be employed to encrypt and decrypt information, using different quenching molecules. These include an internal filtering effect, a dynamic quenching effect, and a combined static and dynamic quenching effect. The recovery of different information under different light sources enables encryption and decryption cycles.
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高影响因子
SOLID STATE SCIENCES
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2024
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IF 3.4
Jingjing Lian,Xiya Miao,Yilian Ran,Ruiqi Liu,Xiang Liu,Ling-Ling Zheng,Ruijin Yu
A series of orange-red InGaZnO 4 : x Eu 3+ (0.2 mol% ≤ x ≤ 20 mol%) phosphors were successfully synthesized via high-temperature solid-state reaction. The structural characterization, morphology, elemental analysis, and optical properties of the prepared phosphors were extensively discussed. Under 468 nm excitation, the prepared phosphors emit orange-red light at 614 nm and 625 nm due to the electric dipole (ED) transition from the 5 D 0 to 7 F 2 level of Eu 3+ . The emission peak at 593 nm is attributed to the magnetic dipole (MD) transition. The optimal doping concentration of Eu 3+ in the phosphor is 2 mol%, resulting in excellent color purity, with all samples exhibiting purity levels exceeding 99.9 %. Furthermore, the phosphors demonstrate remarkable thermal stability, retaining 73.5 % of their luminescent intensity at 420 K and surpassing a thermal quenching temperature of 480 K. The calculated activation energy (E a ) of InGaZnO 4 :2 mol%Eu³⁺ (0.27 eV) further underscores its exceptional thermal stability. The internal quantum efficiency (IQE) of the InGaZnO 4 :2 mol%Eu 3+ phosphor is measured at 46.3 %, indicating a high level of photoelectric conversion efficiency. Latent fingerprints (LFPs) developed using the InGaZnO 4 :2 mol%Eu 3+ phosphor display outstanding selectivity and contrast, allowing for precise identification of Level I-III fingerprint details. Additionally, security ink formulated with InGaZnO 4 :2 mol%Eu 3+ shows potential applications in information encryption and anti-counterfeiting measures. Therefore, the investigated phosphors exhibit significant potential for further development due to their favorable optical properties.
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NEW JOURNAL OF CHEMISTRY
·
2025
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IF 2.5
Kuiyu Yi,Qifeng Zhao
Light green SF (LGSF), a pervasive dye posing a grave risk to human health, urgently demands the creation of a straightforward, swift, sensitive, intuitive, and recyclable detection method. In this research endeavor, we have innovatively designed a Eu3+@MOF-1 ratiometric fluorescent (RF) probe, utilizing a post-synthetic modification (PSM) approach, for the efficient detection of LGSF in lake water and green-colored beverages. This probe exhibits distinctive fluorescence emission properties, characterized by dual emission peaks at 443 nm and 614 nm. In the presence of LGSF, the emission intensity at 443 nm remains constant, functioning as an internal reference, while the emission intensity at 614 nm decreases progressively. This shift is attributed to the principle of fluorescence resonance energy transfer (FRET), where LGSF effectively quenches the fluorescence of Eu3+@MOF-1 at 614 nm, thereby enabling RF detection of LGSF. Notably, the luminescence color of Eu3+@MOF-1 undergoes a significant change from red to blue upon LGSF addition, which is readily observable by the naked eye. A thorough analysis of the fluorescence quenching mechanism of LGSF on Eu3+@MOF-1 has been conducted. Furthermore, the Eu3+@MOF-1 RF probe exhibits robustness, enduring five testing cycles with a clear transition from red to blue in each iteration, underscoring its high stability and reproducibility. Experimental findings reveal that the Eu3+@MOF-1 RF probe exhibits remarkable specificity, sensitivity, and exceptional regeneration capabilities for LGSF detection. This RF probe offers a potent tool for monitoring water pollution and identifying illicit additions of LGSF in yellow-green beverages, highlighting its broad spectrum of application prospects.
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