Journal of Physical Chemistry C
·
2012
·
IF 4.805
Hongliang Tan,Baoxia Liu,Yang Chen
The metal–organic coordination polymer has emerged as a new family of functional nanomaterials. In this work, we prepared a luminescence coordination polymer based on spontaneous self-assembling of nucleotide (AMP) and Eu3+ ions in aqueous solution. After antenna ligand tetracycline (Tc) was introduced to the coordination polymer (AMP/Eu), a strong europium luminescence was observed due to the intramolecular energy transfer from tetracycline to Eu3+. Because of the hydrophobic environment of the polymer interior, the luminescence intensity of AMP/Eu incorporated tetracycline (AMP/Eu–Tc) was 30 times higher than that of AMP/Eu in a solution containing the same amount of tetracycline. AMP/Eu–Tc displays a long emission lifetime, excellent dispersion, and stability in aqueous solution. The coordination polymers based on antenna ligands possess great potential in the applications of ultrasensitive time-resolved fluorometric assays and biological imaging.
研究领域:
材料科学
·
生物医学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2020
·
IF 2.726
Yanling Shi,Song Ye,Huazhen Liao,Junfang Liu,Deping Wang
Faujasite (FAU) type zeolite is built from sodalite cages that joined by oxygen bridges between the hexagonal faces, and is characteristic of high cation exchange capacity and thermal stability. In this research, the FAU-NaX zeolite with Na/Si/Al molar ratio of 4.08:1.4:1.0 was prepared with template-free hydrothermal method and then confirmed with XRD analysis , based on which a series of Ag + or/and Eu 3+ loaded zeolites were obtained through the ion-exchange procedure. The PL spectra measurement indicated that after heat treatment at optimized temperatures between 400-600 °C, the Ag + loaded zeolites showed strong green visible emission centered around 540–550 nm, which is due to the formation of Ag 3 n+ clusters. Furthermore, efficient energy transfer from silver-clusters to Eu 3+ can be achieved in the Ag + /Eu 3+ loaded zeolites, and the energy transfer efficiency that evaluated with silver-clusters lifetimes are 23.9%, 44.6%, 67.4% and 73.6%, respectively, in ZX-2Eu30Ag, ZX-5Eu30Ag, ZX-10Eu30Ag and ZX-20Eu30Ag. Besides, the XPS measurements implied that the loading of Eu 3+ resulted in a further reduction of silver-clusters, which can also promote the formation of silver-clusters without heat treatment. This new class of metal-clusters and rare earth (RE) ions co-actived phosphors may offer interesting perspective applications in optoelectronics and lighting.
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 ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Li Lv,Junzhong Wang,Wei Wang,Limin Han
In this paper, Y 3+ ions doped CaMoO 4 :Eu 3+ with controlled microstructures were prepared via a hydrothermal method . All samples were fully characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), UV–vis diffuse reflectance spectroscopy, and photoluminescence measurement. The luminescent performance improvement aroused by doping was systematically investigated after inducing Y 3+ as co-doping ions in CaMoO 4 :Eu 3+ lattice. It is found that the lattice of Y 3+ doped CaMoO 4 :Eu 3+ nanocrystals contracted with increasing the Y 3+ concentration, resulting in a red shift of 1 A 1 → 1 T 1 transition from the valence band to the conduction band. Meanwhile, excitation band at 300 nm corresponding to the typical 1 A 1 → 1 T 1 transition also shifted to lower energy, originating from the charge-transfer between MoO 4 2− group and Eu 3+ ions. When the Y 3+ doping concentration was less than 0.05, the quantum efficiency of Y 3+ doped CaMoO 4 :Eu 3+ nanocrystals was all superior to pure CaMoO 4 :Eu 3+ nanocrystals, which can be assigned to the lattice structure contraction, co-doping effect, doping concentration variation. However, as the content of Y 3+ ions further increasing, Y 3+ ion should act as a luminescence killer, and therefore resulting in a nonradiative de-excitation.
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 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.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Yuan Wang,Zhikai Liang,Kezhou Jiang,Yifang Lin,Daomiao He,Jinhui Liu,Weixian Wang,Jingfei Wang,Bin Deng,Dan Zhang,Ruijin Yu
A novel single-phase trivalent europium activated red-emitting SrLaNaTeO 6 phosphor was first synthesized in a process of traditional high-temperature solid-state. The phase purity, morphology, and spectroscopy of the prepared phosphor were analyzed. Under 395 nm excitation, the photoluminescence (PL) spectra of the SrLaNaTeO 6 :Eu 3+ products mainly contained five dominant sharp peaks. The intense red emission peak at 615 nm was the typical 5 D 0 → 7 F 2 electric dipole transition of Eu 3+ . The optimum product of high quenching concentration was the SrLaNaTeO 6 :0.90Eu 3+ , which reached a high internal quantum efficiency (IQE) of 90.6%. The SrLaNaTeO 6 :0.90Eu 3+ was estimated to have R c of 6.57 Å and possessed high color purity of 100.0%. The phosphors exhibited excellent thermal stability and high activation energy ( E a = 0.29 eV). The prepared white light-emitting diode (WLED) had a high color rendering index (CRI) R a of 92 and a low correlated color temperature (CCT) of 5008 K. In conclusion, the phosphors have potential as red components for WLEDs.
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 Physical Chemistry C
·
2019
·
IF 4.309
Xiaolei Lu,Shuxian Wang,Shuxin Liu,Peng Du,Zhengmao Ye,Xuefei Geng,Xin Cheng
Ca2SiO4 is a phase-change material, and γ- and β-Ca2SiO4 usually coexist in the sintered product. The overlap of the diffraction data between the two polymorphs makes the relevant phase identification difficult. In this work, the Eu3+ rear-earth fluorescence probe is introduced in the preparation of Ca2SiO4, and the obtained result indicates that the introduction of Eu3+ ions facilitates the increase in the content of β-Ca2SiO4 in the final product. In addition, the differences of the local coordination environments between the two Ca2SiO4 phases obviously influence the crystal-field splittings of Eu3+ ions, especially in the 5D0 → 7F0 nondegenerate and 5D0 → 7F1 magnetic dipole transition regions. On the basis of the excitation from the Eu3+–O2– charge-transfer band, the low-temperature spectral changes are systematically discussed. The transition area ratios of 5D0 → 7F0/5D0 → 7F2 and 5D0 → 7F1/5D0 → 7F2 present a positive and negative correlation with the increase of the excitation wavelength, respectively. The four nonequivalent 5D0 → 7F0 emission peaks with low to high wavelengths are identified as Eu3+ ion-occupied Ca(β-2) (571.8 nm), Ca(β-1) (573.8 nm), Ca(γ-2) (577.6 nm), and Ca(γ-1) (578.9 nm) sites. Besides, the relationship between the phase content of γ-Ca2SiO4 and the spectral change for the 5D0 → 7F0 emissions of the Eu3+ ions is also built. It is fitted by an exponential correlation function and is quite suitable for the prediction of the phase content of γ-Ca2SiO4 based on the measured spectra. The findings in this study manifest the promising application of the Eu3+ fluorescent probe in phase identification and enrich the analysis method in inorganic phase-change materials.
研究领域:
材料科学
·
无机化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 43
·15312-15321
·
IF 6.4
Rui Rui Yang,Fangrui Cheng,Bang Lan
Trivalent rare earth Eu3+-doped luminescent materials have been used successfully for illumination and displays due to their narrow emission lines and extreme stability. Extending the excitation band to the UV, near UV and blue region via doping lanthanide ions as a sensitizer is highly desired for white LED application. However, the complex redox reaction and forward/backward energy-transfer pathway between the sensitizer ion and Eu3+ ion in the same lattice of the phosphor host limits the potential of this strategy. Herein, we present the luminescence properties of hierarchical porous composite materials with the formula Tb(C12H8N2)2(NO3)3@Ca0.9Eu0.1MoO4 and report how interfacial energy-transfer enhanced the absorption range of the Eu3+-doped material in the UV region. The scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images illustrated that the obtained Ca0.9Eu0.1MoO4 had a hierarchical porous structure, and the Tb(C12H8N2)2(NO3)3 was evenly filled inside the holes or the surface. The photoluminescence and decay data indicated the existence of interfacial forward energy transfer from Tb3+ → Eu3+. Furthermore, the thermal stability of the composited Tb(C12H8N2)2(NO3)3 was improved, indicating the potential of the composite materials for application in UV light-emitting diodes.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 8
·期 3
·1143-1150
·
IF 6.641
Zhizhen Wang,Zhen Song,Lixin Ning,Quanlin Liu
Warm-color persistent luminescent materials are strongly desired for signage markings and medical imaging in comparison with green or blue counterparts. Herein we report a novel yellow long-persistent phosphor, Nb-doped Sr3SiO5:Eu2+, with a peak wavelength of ∼580 nm and persistence time of more than 14 hours at the 0.32 mcd m−2 threshold value after UV radiation. A combination of thermoluminescence (TL), thermoluminescence excitation (TLE), electron paramagnetic resonance (EPR) measurements and density functional theory (DFT) calculations reveals that the persistent luminescence enhancement is attributed to a significant Nb-induced increase of oxygen vacancies that act as electron trapping centers with appropriate trap depths. Groups of time-dependent color-change images are realized with this material, which has potential applications as anti-counterfeit and indicator marks. This investigation also expands the application of transition metal (TM) ions to the field of persistent luminescence and would motivate further exploration of TM substitutions to design and improve silicate or aluminosilicate persistent phosphors with superior performance.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
ELECTROANALYSIS
·
2014
·Vol. 26
·期 12
·2710-2715
·
IF 2.502
Qi-Le Li,Ning Bao,Shou-Nian Ding
Phosphate anions are determined based on the electrochemiluminescence (ECL) of CdSe quantum dots (CdSe QDs) capped with 3-mercaptopropionic acid. The ECL gets quenched with the introduction of Eu 3+ ions, but it is restored on the further addition of phosphate anions. The sensing mechanism might be due to the strong and specific interaction between phosphate anions and the Eu 3+ ions, leading to the releasing of CdSe QDs from aggregates. On the basis of the quenching/recovery ECL behaviors, the ECL sensor offer acceptable sensitivity, high selectivity, and a linear response from 0.1 to 120 µM with a detection limit of 0.03 µM (3δ) for phosphate anions.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 28
·期 7
·5615-5622
·
IF 1.798
Chu Yang,Hao Haixia,Xie Hongde,Chen Cuili,Cai Peiqing,Seo Hyo Jin
In this work, we report the preparation of lanthanide (Eu 3+ , Tb 3+ )-complex-grafted copolymer of methyl methacrylate and maleic anhydride films. The lanthanide complex with three amino groups was used to react with poly(methyl methacrylate-co-maleic anhydride) (P(MMA-MAH)) via the amidation method. Fourier transform infrared (FT-IR), Transmission electron microscope (TEM), Scanning electron microscope (SEM), Thermogravimetric analysis (TGA) were employed to characterize those polymers. Luminescent properties were evaluated through conducting Photoluminescence (PL) excitation spectra, emission spectra and fluorescence decay curves measurements. The infrared analysis reveals the amidation between amino groups and anhydride rings. The comparatively uniform morphology can be observed in the images of TEM and SEM. These polymers can emit intense characteristic lights including red light from Eu 3+ ions and green light from Tb 3+ ions under 294 nm excitation. The lifetimes of polymers are short (about 1 ms). Meanwhile, these luminescent polymers exhibit high thermal stability (T 5 > 200 °C). We also stimulate a lamp to illustrate the possible application. All these approved interesting results suggest that they hold significant promising applications as luminous layers for optoelectronic devices.
研究领域:
材料科学
·
光学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2014
·
IF 4.835
Bing Chen,Xvsheng Qiao,Dengfeng Peng,Xianping Fan
In this study, hexagonal-phase NaY0.6–xCe0.1Gd0.3EuxF4 nanorods were synthesized via a mild solvothermal method. By modifying the Eu3+ dopant concentration, the crystal phase, morphology, and luminescent properties were well controlled. A broad excitation band centered at around 260 nm corresponding to the 2F5/2 → 4f-5d transition of Ce3+ was detected in the hosts containing Gd3+ ions by monitoring the Eu3+ emissions, indicating that an efficient Ce3+ → Eu3+ energy transfer occurred via the Gd3+ sublattice. Luminescence decay behaviors of the NaY0.6–xCe0.1Gd0.3EuxF4 nanorods were studied, and the energy transfer mechanism was discussed. An obvious rising edge on the luminescence decay curve of Eu3+ ions in the NaY0.6–xCe0.1Gd0.3EuxF4 nanorods was observed. The rising time is proposed to describe the energy migration time from Ce3+ to Eu3+ via the Gd3+ sublattice.
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 ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Ziqian Lv,Hanyu Xu,Zhiying Wang,Mochen Jia,Yanling Wei,Zuoling Fu
The composite of biocompatible carbon dots (CDs) and lanthanide-based luminescent materials have high research value as a promising multifunctional material, which are ideally suited to information encryption and white LED. However, the aggregation-induced quenching of CDs in the solid state still troubles the synthesis of CDs with other solid luminescent materials. Herein, a facile strategy to fabricate polychromatic nanoplatform KLa(MoO 4 ) 2 : Eu 3+ @CDs by encapsulating CDs on the surface of KLM: Eu 3+ with silicon shell is reported, in which the aggregation-induced quenching of CDs is avoided. Due to the overlapping of Eu-O charge transfer band with CDs excitation band, the red luminescence of Eu 3+ ions and the blue fluorescence of can be emitted simultaneously under 395 nm excitation. By changing the proportion of KLa(MoO 4 ) 2 : Eu 3+ in KLa(MoO 4 ) 2 : Eu 3+ @CDs, the mixture can emit "warm", "neutral", and "cold" white light, which can realize people's demand for indoor lighting requirements. Furthermore, a multi-mode information encryption by selectively triggering the luminescence of CDs or Eu 3+ ions is also designed. All the results suggest that KLa(MoO 4 ) 2 : Eu 3+ @CDs have excellent luminescence properties that can be further investigated and applied in the field of white LEDs and information encryption.
研究领域:
材料科学
·
光学
·
信息加密技术
✓ 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）