JOURNAL OF RARE EARTHS
·
2023
·
IF 4.9
Baochen Wang,Shifeng Sun,Zeqi Li,Zongwang Li,Weiwei Lin,Chao Zeng,Yan-gai Liu,Ruiyu Mi
Rare earth co-doped phosphor for fluorescence intensity ratio (FIR) thermometer has gained increasing attention in recent years. Herein, the novel Tb 3+ and Eu 3+ co-doped K 3 SrBi(P 2 O 7 ) 2 (KSBP) phosphate phosphors were reported. The crystal structure of the title phosphor was determined using Rietveld refinement and proved to have a three-dimensional structure. The time-resolved spectroscopy reveals that there is almost no energy transfer between Tb 3+ and Eu 3+ . More importantly, Tb 3+ and Eu 3+ emissions show different thermal quenching behaviors, which claims the potential of this material for application in optical thermometer. The FIR of the typical KSBP:0.02Tb3+,0.04Eu3+ sample demonstrates a polynomial relationship as a function of temperature and the absolute and relative sensitivity are 0.025 K –1 and 0.59%/K, respectively. In general, our study reports a novel and potential KSBP:Tb 3+ ,Eu 3+ phosphate phosphor that is promising for use in high-sensitive FIR thermometers.
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JOURNAL OF LUMINESCENCE
·
2019
·
IF 2.961
Ya-Li Xue,Dan Zhao,Li-Na Zhang,Xiao-Qi Cui,Xiao-Yang Han,Qing-Xia Yao
For the first time, rare-earth phosphate compound Cs 4 PbTb 2 (PO 3 ) 12 was prepared using molten salt method and structurally characterized by single-crystal X-ray diffraction (XRD). Its structure features a three-dimensional (3D) open framework constructed by P 4 O 12 cyclotetraphosphate groups and (Pb|Tb)O 8 polyhedra, with large holes filling with Cs + ions. The P 4 O 12 groups in this structure are isolated and each P 4 O 12 is surrounded by four (Pb|Tb)O 8 polyhedra by sharing terminal O atoms. Furthermore, the powder XRD , infrared (IR) spectrum, Ultraviolet–visible (UV–Vis) spectroscopy and photoluminescence (PL) properties for title compound were studied. Under near-UV excitation (378 nm), the emission colour turns from green through yellow to pure red by simply adjusting the Eu 3+ concentration due to the efficient Tb 3+ →Eu 3+ energy transfer mechanism.
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Materials
·
2018
·Vol. 11
·期 7
·1090
·
IF 2.467
Man Yan,Guanghui Liu,Jiahao Wen,Yinlong Wang
The system NaLa(MoO4)2:Eu3+/Sm3+phosphors were prepared by solid-state reaction followed by heat treatment at 450–600 °C. As shown by X-ray powder diffraction, the phosphors had a body-centered tetragonal structure, high phase purity and high crystallinity. The photoluminescence measurements carried out under excitation at 464 nm indicated the main emission at about 615 nm corresponding to the electric dipole transition5D0→7F2of Eu3+, which agreed well with the emission wavelengths of the GaN-based blue LED chips. In NaLa(MoO4)2:Eu3+/Sm3+phosphors, Sm3+can efficiently transfer excitation energy to Eu3+, which resulted in a significant improvement of the fluorescence intensity, and the fluorescence intensity of the phosphors calcined at 550 °C maximized at the doping concentrations of Eu3+and Sm3+of 15.0 and 2.0 mol %, respectively. The decay curves and CIE (Commission Internationale de L’ Eclairage) coordinates of Sm3+or/and Eu3+doped phosphors were analyzed for the investigation of the energy transfer mechanism and color variation trend. Thus, NaLa(MoO4)2:Eu3+,Sm3+can be classified as a potential red-emitting phosphor for white light-emitting diodes (WLEDs).Keywords:luminescence properties;molybdate;red-emitting phosphor;energy transfer
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高影响因子
Journal of Materials Chemistry C
·
2016
·Vol. 4
·期 26
·6327-6335
·
IF 5.066
Weijing Yao,Qingyong Tian,Jun Liu,Zhaohui Wu,Shuyuan Cui,Jin Ding,Zhigao Dai,Wei Wu
Up-conversion materials can be applied in anti-counterfeit fields because of their high concealment and high up-conversion fluorescence efficiency. Herein, different lanthanide ions-doped β-NaYF4 up-conversion micro-particles (UCMPs) with uniform hexagonal morphology were synthesized on a large-scale (more than 0.5 g) via a facile hydrothermal method. It is very interesting to find out the fluorescence intensity and the eventual morphology of the UCMPs were highly dependent on the reaction conditions. Then, the optimal UCMPs with uniform morphology and strong fluorescence intensity were selected as promising candidates for preparing ink. Eventually, we successfully printed designable and multicolor fluorescent patterns on flexible substrates (common paper and polyethylene terephthalate, PET) using the as-prepared β-NaYF4:Yb3+,Tm3+/Er3+/Eu3+ UCMPs inks. Under ambient conditions, the printed patterns on conventional paper are invisible, while such printed patterns on PET are white. However, all the patterns could display blue, yellow-green and green fluorescence patterns under the irradiation of a 980 nm laser when using the β-NaYF4:Yb3+,Tm3+/Er3+/Eu3+ UCMPs inks. We envision that the UCMPs fluorescent inks-based flexible and rapid screen printing patterns have enormous potential for anti-counterfeit and security applications.
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Optical Materials Express
·
2016
·Vol. 6
·期 11
·3574-3585
·
IF 2.657
X. Y. Liu,H. Guo,S. X. Dai,M. Y. Peng,Q. Y. Zhang
In this paper, novel Bi3+/Eu3+ co-doped white-emitting germanium-borate glasses were successfully prepared by the melt-quenching method. Their luminescent properties were evaluated using the transmission spectra, photoluminescence excitation, and emission spectra (with a temperature range of 298-573 K), and lifetime decay curves. Due to the efficient energy transfer from Bi3+ to Eu3+, tunable emitting color between the bluish-green and the orange-red region has been obtained by varying the content of Eu3+ (0-7%). Interestingly, a perfect white-light emission with CIE coordinates (X = 0.356, Y = 0.325) is realized upon the excitation at 345 nm light in the Bi3+/Eu3+ co-doped sample. More remarkably, the white-light emission glass maintains excellent color stability even at 423 K. Our results indicate that the Bi3+/Eu3+ co-doped germanium-borate glasses may be used as a potential single-phased white light-emitting matrix material for the UV converted organic-resin-free WLEDs in the future.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Yuexin Wang,Yanhua Song,Xiuqing Zhou,Keyan Zheng,Ye Sheng,Pingchuan Ma,Bowen Zhang,Meiqi Chang,Haifeng Zou
Uniform Lu 2 (C 4 H 4 O 6 ) 3 ·6H 2 O cauliflower-like microspheres have been synthesized via a direct precipitation method at room temperature, without any templates and catalysts. The solvent-dependent morphological evolution and the formation mechanism of the Lu 2 (C 4 H 4 O 6 ) 3 ·6H 2 O cauliflower-like microspheres were investigated in detail. Furthermore, Eu 3+ /Tb 3+ -doped Lu 2 O 3 inherited their parents' morphology were obtained through a direct annealing process. The Lu 2 (C 4 H 4 O 6 ) 3 ·6H 2 O:Eu 3+ , Lu 2 O 3 :Eu 3+ exhibit strong red emission corresponding to the 5 D 0 - 7 F j transition of the Eu 3+ ions. The Lu 2 (C 4 H 4 O 6 ) 3 ·6H 2 O:Tb 3+ , Lu 2 O 3 :Tb 3+ exhibit strong green emission corresponding to the 5 D 4 - 7 F j transition of the Tb 3+ ions under UV light excitation. The samples may have potential applications in the fields, such as light-emitting phosphors, advanced flat panel displays, or biological labeling.
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Analytical Methods
·
2013
·Vol. 6
·期 3
·915-923
·
IF 1.855
Zhilong Song,Chunbo Liu,Jianming Pan,Yongsheng Yan,Xiao Wei,Minjia Meng,Ping Yu,Lin Gao,Jiangdong Dai,Shuang Lin
Porous silica nanospheres were fabricated using a facile surface-protected etching strategy. Polyvinylpyrrolidone (PVP) was used as a protecting polymer adsorbed on the surface of silica nanospheres and NaOH was employed as an etching agent. Owing to the protective action of PVP and inhomogeneous etching, mesopores were created in the silica nanospheres. Then, based on a simple and economical wet-chemical route, highly luminescent YVO4:Eu3+ nanocrystals were then integrated onto the nanospheres to form a highly luminescent mSiO2/YVO4:Eu3+ composite material. This material, which combined the mesoporous structure of SiO2 and the strong red luminescence property of YVO4:Eu3+, could be used as a novel optosensing system. The structure, morphology, porosity, and optical properties of the materials were well characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, N2 adsorption/desorption, and photoluminescence spectra, and the optical stability and effect of pH on mSiO2/YVO4:Eu3+ were also evaluated. It was observed that λ-cyhalothrin (LC) could quench the luminescence of mSiO2/YVO4:Eu3+ in a concentration-dependent manner, which was best described by a Stern–Volmer-type equation. This study therefore demonstrated that the composite material could be potentially used as a probe to monitor the residues of LC in water.
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Journal of Materials Chemistry A
·
2024
·
IF 10.7
Tonghui Li,Wenfei Shen,Zaixin Long,Yanying Zhang,Yao Wang,Wei Wang,Zhonglin Du,Jiuxing Wang,Laurence A. Belfiore,Olle Inganäs,Jianguo Tang
UV protection of polymer solar cells is significant to extend the duration of life and to improve their efficiency. Diatom shells doped with Eu3+/Tb3+ complexes (ETDSs) can be used as an efficient absorber and down-conversion agent for these purposes. In this work, the goal is effective UV protection and photovoltaic efficiency enhancement of polymer solar cells using DSs doped with Eu3+/Tb3+ complexes. These Eu3+/Tb3+ complexes in DSs are anchored at porous walls through a grafted coupling agent. As a strong UV absorber and efficiency enhancer, ETDSs were compounded into the cellulose acetate (CA) matrix to get an ETDS@CA flexible luminescent film. This luminescent film with high UV absorption in the range of 200–400 nm down converts UV photons into photons in visible, at 612 nm. We spin-coat the mixture solution of ETDS and CA onto the back surface of the transparent ITO/glass electrode to set up the ETDS@CA protected polymer solar cell. In this way, both UV protection and polymer solar cell efficiency enhancement are achieved. The experimental data indicated that ETDS@CA coated polymer solar cells can maintain 80% of the initial efficiency after UV-radiation for 1000 h, compared with 40% of unprotected polymer solar cells. Correspondingly, the efficiency of polymer solar cells has been enhanced by 4%. This method can be developed into a new and highly efficient way to UV protect polymer solar cells, as the original structure of polymer solar cells is not modified, with only an additional UV protection layer on the other side of the substrate.
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JOURNAL OF MOLECULAR STRUCTURE
·
2024
·
IF 4
Jian-Wei Zhang,Ya Chen,Yong-Ya Zhang,Wei Wei
In this work, by utilizing an X-type tetracarboxylate ligand (1,2,4,5-tetrakis(4-carboxyphenyl)benzene, H 4 TCPB), a novel Mn-organic framework, namely, [(CH 3 CH 2 ) 2 NH 2 ] 2 [Mn(TCPB)(H 2 O) 2 ] ( SQNU-25 , SQNU = Shangqiu Normal University), was prepared under a DEF/HAc solm. Due to the structural advantage of SQNU-25 , the Ln 3+ ions (Eu 3+ and Gd 3+ ) have been successfully introduced into the framework by post-synthetic modification. The result of the energy levels of the H 4 TCPB ligand and Eu 3+ ion shows that the H 4 TCPB ligand as a chromophore can effectively sensitize Eu 3+ ions. Moreover, the Eu@SQNU-25 not only shows a typical Eu 3+ ion red emission but also exhibits good temperature sensing in the wide temperature range (80 to 300 K).
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OPTICAL MATERIALS
·
2024
·
IF 3.8
Jietong Xu,Xipeng Cui,Shuhua Zhong,Yu He,Gongwu Song
The development of a sensitive and facile method for the detection of tetracycline (TC) is crucial for food safety and environmental protection, as TC residues pose a major threat to human health and the ecological environment. In this work, a ratiometric fluorescence probe containing mesoporous silica nanoparticle (MSNs) encapsulated CDs (MSNs@CDs) and Eu 3+ is constructed for the detection of TC. With the addition of TC into MSNs@CDs-Eu 3+ solution, the internal filter effect (IFE) of the TC to MSNs@CDs induces the quenching of the blue fluorescence emission at 430 nm of the MSNs@CDs, while the antenna effect (AE) of Eu 3+ to β-diketone structure of TC amplifies the red fluorescence emission at 617 nm of the Eu 3+ . Therefore, based on the ratio changes of the two fluorescence signals (I 616 /I 430 ), a sensitive and selective method for the detection of TC is established. The detection range of this method is from 0 to 50 μM with detection limit of 24 nM. Since there are obvious color changes throughout the TC detection process, a 3D-printing device based on the smartphone is designed for digital image detection of TC. The picture of solution is taken by smartphone and the color signal is converted into digital signal by color recognition software, thus realizing the visual and rapid quantitative detection of TC. The linear regression equation is R/(G + B) = 0.01C TC +0.49, and the detection limit is 40 nM. This method is applied for the detection of TC in the real sample with recoveries from 93.58 % to 108.1 %, which provides a new strategy for rapid and on-site detection of TC in actual water samples for environmental protection.
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DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 9
·4325-4341
·
IF 3.5
P. J. Xia,X. Z. Zheng,L. Yue,Y. F. Lei,M. Xu,W. B. Dai
For further development of light sources, white light-emitting diodes (wLEDs) have attracted widespread attention as promising next-generation light sources fabricated via the combination of phosphors and LED chips. However, latent defects, such as chemical/thermal instability, low color rendering index (CRI) and high correlated color temperature (CCT), of current mainstream wLEDs seriously hinder their further large-scale implementation. Herein, in order to overcome these limitations, single-phase color-tunable gaudefroyite (Ca3Y(GaO)3(BO3)4 (CYGB)) tridoped with Bi3+/Tb3+/Eu3+ ions was synthesized for the first time and detailed characterisation was performed via high-temperature solid-state reaction and structural/spectral analyses, respectively. Radius difference percentage calculations and Rietveld refinements indicate that dopants occupy both Y3+ and Ca2+ sites but preferably the Y3+ site over the Ca2+ site due to the same valence state. Through subtly regulating the (co)doping contents and skillfully utilizing the energy transfer (ET) strategy from the allowed transition of blue light-emitting Bi to the forbidden transition of green/red light-emitting Tb/Eu, the color hue (including white light) of highly efficient PL can be easily tuned according to the need. Meanwhile, composition/content-optimized white light-emitting CYGB:2%Bi/10%Tb/12%Eu also shows splendid chemical/thermal stability. Finally, as a proof-of-concept experiment, the CYGB:2%Bi/10%Tb/12%Eu phosphor-converted wLED (pc-wLED) was fabricated and encapsulated via the up-to-date remote ‘capping’ method, which imparted attractive performances. Altogether, the stable CYGB:Bi/Tb/Eu phosphor is a promising candidate for application in lighting/display fields.
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OPTICAL MATERIALS
·
2024
·
IF 3.8
Changwen Wang,Lixin Peng,Feng Qin,Meng Kou,Yongda Wang,Lingling Xu,Zhiguo Zhang
The understanding of how radiative transition probabilities change with temperature is crucial for comprehending the relationship between fluorescence behavior and temperature. However, although various models have been proposed to explain the patterns of transition probabilities ( A ) with temperature changes, they lack consistency due to their derivation from distinct microscopic perspectives. In this study, the macroscopic law of the temperature-dependent A for the 4 G 5/2 , 4 F 9/2 , and 5 D 0 energy states in YVO 4 :Re 3+ (Re 3+ =Sm 3+ , Dy 3+ and Eu 3+ ) was obtained. Three rare earth ions (Re 3+ ) were identified for each with unique energy level properties conducive to validating the general rules of A . These ions share a common characteristic: in the visible spectrum , their main emissions originate from the radiative transitions from the same higher energy level ( 4 G 5/2 in Sm 3+ , 4 F 9/2 in Dy 3+ , and 5 D 0 in Eu 3+ ) to lower energy levels, respectively. The A of the main emission levels, varying with T , were obtained by fitting the fluorescence decay curves. The exponential law governing non-radiative transitions was revealed after separating the radiative transition rate ( W R ) from A . The macroscopic law of temperature-dependent transition probabilities of 4 G 5/2 , 4 F 9/2 , and 5 D 0 energy states in YVO 4 :Ln 3+ (Ln 3+ = Sm 3+ , Dy 3+ and Eu 3+ ) has been found to follow the Boltzmann distribution . The results indicate that the non-radiative transitions of the main emission levels of the rare-earth ions are processes from the excited state to adjacent lower energy levels. This macroscopic pattern may serve as a foundational rule for understanding the impact of microscopic factors on A .
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