JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2024
·
IF 4.3
Renping Cao,Jinrong Wang,Binhui Zhong,Ting Chen,Bang Lan,Fangrui Cheng,Ru Liu,Jing Wang
New tunable-color luminescent materials with single pure phase are one of the main research objectives at present. We synthesize La 7 Nb 3 W 4 O 30 :R (LNWO:R) (R Dy 3+ , Eu 3+ , and Dy 3+ /Eu 3+ ) in air. The high temperature solid-state method is used. We study the purity, crystal phase and structure, luminescence properties, and lifetimes of the samples. Excitation spectrum of LNWO:Dy 3+ comes from the O 2− - Dy 3+ charge transfer band (CTB) and the f – f electron transitions of Dy 3+ . LNWO:Dy 3+ can glow yellow light due to the transitions 4 F 9/2 → 6 H 15/2 , 6 H 13/2 , 6 H 11/2 , and 6 H 9/2 of Dy 3+ . LNWO:Eu 3+ has excitation spectrum due to the O 2− - Eu 3+ CTB and the f – f electron transitions of Eu 3+ . LNWO:Eu 3+ emits the red-orange/red light owing to the transitions 5 D 0 → 7 F 1 , 7 F 2 , 7 F 3 , and 7 F 4 of Eu 3+ . The emitting color of LNWO:Dy 3+ , Eu 3+ can be adjusted by changing the excitation wavelength and the content of Dy 3+ and Eu 3+ because of the double effects of energy transfer among Eu 3+ ions and energy of Dy 3+ . The yellow, red-orange, and red emission of LNWO:Dy 3+ , Eu 3+ is found. The lifetime rises with adding doped-ions concentration owing to the increase of non-radiative transitions. The luminous mechanism is analyzed via energy level diagrams. The research results offer a help for the development of new luminescent materials.
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高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2025
·Vol. 131
·期 6
·1-11
·
IF 2.8
Wang Qun,Bu Ranran,Xu Changyuan,Zhao Fengjiao,Yin Hongming
Tellurite glass samples doped with Er 3+ and Eu 3+ were synthesized by the high-temperature solid phase method. The XRD diffraction pattern shows the amorphous properties of the prepared samples. The luminescence properties of glass samples were analyzed using the absorption spectrum, excitation spectrum, and emission spectrum. The energy transfer mechanism between Er 3+ ions and Eu 3+ ions was studied by changing the concentration of Eu 3+ ions, and the results were verified by measuring the luminescence decay lifetime. It is worth noting that at 380 nm excitation, Er 3+ and Eu 3+ co-doped tellurite glass exhibits remarkable tunable luminescence characteristics: by adjusting the concentration of Eu 3+ ions, the emission color can be flexibly adjusted from green to orangish-red. In addition, by effectively combining the prepared co-doped glass sample with the 380 nm GaN chip, the cold white light emission with CIE coordinates of (0.324, 0.320) was successfully achieved. According to the variable-temperature spectroscopy, at 210℃, the emission peak intensities of the co-doped Er 3+ /Eu 3+ tellurite glass at 547 nm and 613 nm are above 70% of the room-temperature luminescence intensity, demonstrating excellent thermal stability. Graphical
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高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Xiaoju Huang,Guihong Zhang,Chaoyong Deng,Min Zhang
Trivalent rare earth ions samarium and europium ions were doped into the prepared Gd 2 MgTiO 6 host crystal structure by high temperature solid phase method. XRD patterns show that the synthesized materials belong to the monoclinic structure with space group P 21 / n . Using UV-visible spectroscopy, the band gaps can be calculated to be 4.18, 4.15 and 3.84 eV for host, Sm 3+ and Eu 3+ -doped samples, respectively. For Sm-doped sample excited with 407 nm, the PL spectrum shows three prominent peaks at 565 nm, 603 nm and 649 nm, which are attributed to the transitions of 4 G → 5 / 2 6 H 5/2 , 4 G → 5 / 2 6 H 7/2 and 4 G → 5 / 2 6 H 9/2 , respectively. The 591 nm and 615 nm emissions of Eu 3+ doping correspond to the transitions from 5 D 0 to 7 F 1 and 7 F 2 , respectively. The optimal concentrations are 0.03 mol and 0.09 mol for Sm 3+ and Eu 3+ doping, respectively. The prepared samples can be used in the field of LEDs thanks to lower color temperature CCT=1700∼2200 K and higher color purity >97%.
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高影响因子
Materials Research Express
·
2016
·Vol. 3
·期 4
·045010
·
IF 0.968
Ting Fan,Jiantao Lü,Futian Lin,Zifan Zhou
Improved red emission in polyvinylpyrrolidone (PVP)-coated hollow LaF3:Eu3+ nanoparticles by introducing Li+ ions was found for the first time via a one-step template-free hydrothermal method. The hollow formation can be attributed to self-recrystallization and a local Ostwald ripening thermodynamic process. Pores were clearly seen and widely distributed in all LaF3 nanoparticles. The introduction of Li+ ions did not introduce new crystalline phases and resulted in little change in size and morphology of the LaF3 nanoparticles. The main diffraction peaks were found to shift slightly with the Li+ doping concentrations, which indicates that Li+ changes the crystal field environment of Eu3+. The excitation and red emission intensity both doubled when codoped with 7 mol% Li+ ions. The widely distributed pores and improved luminescence properties of our nanoparticles facilitated the construction of new nanocomposites for novel biological applications.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2015
·
IF 3.368
Chang Liu,Bing Yan
A novel luminescent lanthanide metal organic framework (Ln-MOF) is synthesized by in situ encapsulating Eu 3+ ions to partial replace the transition-metal clusters in the channels of CPM-17-Zn nanocrystals. The Eu 3+ functionalized zeolite-type MOF hybrid system shows excellent luminescence property and photo-stability in aqueous environment for the sensitization and protection from the host framework. Subsequently, as a highly selective and sensitive sensor, its nanocrystals can be used to detect Cd 2+ in aqueous solution. In addition, the possible sensing mechanism based on ion exchange is discussed in detail. This work is one of the few cases for detecting Cd 2+ in aqueous solution based on a zeolite-type MOF . The good fluorescence stability, low detection limit and broad linear range in aqueous environment make this probe to be expected to have potential application in intracellular sensing and imaging of Cd 2+ potentially.
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高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2015
·Vol. 31
·期 2
·175-178
·
IF 0.875
Lü Yang,Yang Min,Yang Bin,Liu Wei,Zhang Hongdan,Zhao Xudong,Liu Xiaoyang
SrWO 4 :Eu 3+ nanowires were synthesized at 160 °C within 10 min via a microwave-assisted hydrothermal method. In examining the influences of synthesis temperature and reaction time on the morphology of nanowires, it was found that any temperatures and reaction time except 160 °C and 10 min gave rise to poorer morphologies under otherwise equal conditions. The synthesized nanowires were characterized by means of X-ray diffraction(XRD), scanning electron microscopy(SEM), transmission electron microscopy(TEM), high-resolution transmission electron microscopy(HRTEM), energy dispersive X-ray(EDX) and Raman spectrometry, respectively. The results suggest that the samples are homogenous and dispersive single phase nanowires. The photoluminescence properties of the nanowires were determined with a spectrofluorometer. Two obviously sharp peaks at 395 and 464 nm and a broad peak centered at 290 nm were found in their excitation spectrum. Under excitation at 395 and 464 nm, the 5
D
0 → 7
F
2 transition is the dominant process which means Eu 3+ ion is located at a low symmetry site, while the 5
D
0 → 7
F
1 transition dominates under the excitation at 290 nm, showing a highly symmetric field around the Eu 3+ ion, which indicates the presence of the two local Eu 3+ environments.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Tiansong Dai,Guifang Ju,Yang Lv,Yahong Jin,Haoyi Wu,Yihua Hu
Here, a new LiYGeO 4 : Eu 3+ phosphor exhibiting long red persistent luminescence (PerL) is developed herein. Experimental results show that LiYGeO 4 : Eu 3+ with a low doping concentration of Eu 3+ emits high-intensity red PerL, which lasts for more than 21 h. The red PerL of the preirradiated LiYGeO 4 : Eu 3+ phosphor can be repeatedly excited to increase its intensity via short-term stimulation using low-energy near-infrared (NIR) light. Furthermore, LiYGeO 4 : Eu 3+ exhibits strong intrinsic emission, enhancing the f-f emission of Eu 3+ . The PerL emission, photoluminescence (PL) emission, and thermoluminescence (TL) spectra are identical, suggesting the emission originating from the host and Eu 3+ center. TL measurements were conducted to intensively study the trap characteristics of LiYGeO 4 : Eu 3+ using the Booth-Bohun and T m -T stop methods. Results reveal the underlying mechanism of the PerL and the importance of Eu 3+ as the introduced traps in LiYGeO 4 : Eu 3+ . LiYGeO 4 : Eu 3+ with a high doping concentration of Eu 3+ exhibits excellent PL properties and thermal stability, with its quantum efficiency surpassing those of commercial phosphors such as Y 2 O 3 : Eu 3+ , suggesting its potential application in solid-state lighting. Thus, the doping of LiYGeO 4 : Eu 3+ with low and high concentrations of Eu 3+ can be helpful in fabricating materials exhibiting different luminescence properties.
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高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Liuyan Zhou,Yanling Chen,Yuyu Shen,Jianhua Lin,Jie Fu,Lei Lei,Renguang Ye,Degang Deng,Shiqing Xu
Down/upconversion Ca14Al10Zn6O35 inorganic phosphors codoped with Ti4+/Eu3+ or Yb3+/Er3+ were prepared. The crystal structure and downconversion luminescence properties of Ca14Al10Zn6O35:Ti4+, Eu3+ phosphors were studied in detail. Ti4+ and Eu3+ occupied Al3+ and Ca2+ sites in the host lattice, respectively. Under the excitation of 273 nm, the emission peak in the 300–570 nm band originated from the 2T2 → O2– transition of Ti4+. The f–f transition of Eu3+ ions generated multiple peaks in the 570–800 nm range. The emission intensity of Ti4+ and Eu3+ ions can be used as a fluorescence intensity ratio (FIR) signal. Based on the FIR technology, the maximum relative sensitivity (Sr) and the minimum temperature uncertainty (δT) reached 1.41% K–1 and 0.07 K, respectively. Meanwhile, the temperature-sensing behaviors were explored by the temperature-dependent upconversion spectra of Er3+- and Yb3+-codoped Ca14Al10Zn6O35 phosphors. Based on the fluorescence intensity ratio of thermal coupling levels (Er3+:2H11/2/4S3/2), the maximum Sr and minimum δT of upconversion phosphors reached 1.28% K–1 and 0.08 K in the temperature range of 293–473 K, respectively. Ca14Al10Zn6O35:Ti4+/Eu3+ (Yb3+/Er3+) phosphors realize temperature sensors with higher relative sensitivity, and it is a good candidate material for optical temperature measurement.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2018
·
IF 2.732
Huidong Tang,Yongfeng Li,Rong Yang,Wei Gao
Eu 3+ -activated Na 1-x K x BaY(BO 3 ) 2 (x = 0.1–1.0) phosphor was prepared via facile solid-state reaction ceramic method. The structural Rietveld refinements were completed to confirm the phase formations. The luminescence properties were reported such as photoluminescence excitation (PLE) and emission (PL) spectra, decay lifetime, experimental quantum efficiency (QE) and thermal stabilities. The phase formations and the luminescence properties of the phosphors have a dependence on the K + -substituting for Na + in the lattices. The results showed that Na 1-x K x BaY 0.5 Eu 0.5 (BO 3 ) 2 (x = 0.1–1.0) phosphors formed the trigonal NaBaY(BO 3 ) 2 single phase (Na-phase, space-group of R-3, No.148). Increasing the K + -substituting for Na + (x ≤ 0.3) induced the appearance of KBaY(BO 3 ) 2 phase (K-phase, space-group of R-3 m, No. 166) together with the Na-phase (0.3 < x < 0.6). Heavily K-substituted samples crystallized into a single K-phase. Luminescence characteristics of Eu 3+ ions were investigated on the evolution of the substituting-level. It was observed that the phosphors presented the improved emission intensity and thermal stability in the mixed phases.
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高影响因子
ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES
·
2023
·Vol. 78
·期 11
·1061-1067
·
IF 1.8
Arif Ullah,Jinghao Zhuang,Zheng Liu,Xiaozhan Yang,Wenlin Feng
In this work, the phosphors of Eu 3+ ions doped Ba 2.9 Sr 0.1 WO 6 were successfully synthesized by the high-temperature solid-state method. The luminescence properties, including the emission and excitation spectra, fluorescent lifetimes, and CIE chromaticity coordinates were characterized. The crystal structure and composite of the samples were investigated by XRD (X-ray diffraction), and HRTEM (high-resolution transmission electron microscope). The emission spectra consist of the characteristic peak of Eu 3+ excitation at 393 nm; the leading emission peak at 618 nm can be ascribed to the transition of 7 F 0 → 5 L 6 . The optimal red emission is achieved by 2 % Eu 3+ doping. This red Ba 2.9 Sr 0.1 WO 6 : Eu 3+ has good luminescent properties and may have potential application in white LEDs.
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高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 47
·17966-17973
·
IF 4
Shuai Wei,Zeyu Lyu,Dashuai Sun,Pengcheng Luo,Zheng Lu,Luhui Zhou,Mingrui He,Sida Shen,Hongpeng You
In this work, a series of BaSrGd4O8:xBi3+ blue phosphors was synthesized employing the high-temperature solid-state method. Phase purity of the samples was verified by X-ray diffraction and Rietveld refinement. Time-resolved photoluminescence spectra revealed the existence of two distinct Bi sites. Subsequent optimization of dopant types and doping levels in the batch led to an almost twofold increase in quantum efficiency. The introduction of Eu3+ into the phosphors facilitated the construction of an energy transfer pathway. As the concentration of Eu3+ was increased, the emission color changed from blue to purple and finally to red. In addition, the thermal stability and potential applications of the phosphors were extensively investigated. Finally, two WLED devices were successfully fabricated with color rendering indices of 96.27 and 92.18, and correlated color temperatures of 5198 and 2475 K. This underscores the prospective application of these phosphors in the field of high-quality warm WLEDs.
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PubMed
高影响因子
CRYSTENGCOMM
·
2020
·Vol. 22
·期 35
·5809-5817
·
IF 3.117
Guangqing Zhang,Maxim S. Molokeev,Qianchao Ma,Xuening Yang,Shuiquan Han,Qi Chen,Binnian Zhong,Bin Ma
Eu3+-Doped Ba3In(PO4)3 was synthesized through a high-temperature solid-phase method. According to the structure refinement based on X-ray diffraction and density functional theory, the crystal and energy band structures of Ba3In(1−x)(PO4)3:xEu3+ were studied and analyzed in detail. The effect of Eu3+ doping concentrations on emission was studied at an excitation wavelength of 393 nm. For the material Ba3In(1−x)(PO4)3:xEu3+(x = 0.01–0.30), the optimal doping level is confirmed to be 0.18. Due to the thermal quenching differences of Eu3+ at the 5D0 and 5D1 energy levels, and based on the temperature-variable fluorescence intensity ratio between emission peaks, the optical temperature measurement performance of this material in the temperature range from 298.15 K to 623.15 K was characterized, and the maximum absolute and relative sensor sensitivities (Sa and Sr) were determined to be 0.1002 K−1 and 4.058%, respectively. With temperature as the only variable, the color of the phosphor changes from red to yellow light with rising temperature. Besides, Sa and Sr values of this phosphor are comparable to other sensing materials. The results indicate that Eu3+-doped Ba3In(PO4)3 phosphors have great potential to be applied in optical temperature sensing.
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高影响因子
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