JOURNAL OF LUMINESCENCE
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2020
·
IF 3.28
Chenxia Li,Bowen Chen,Degang Deng,Hua Yu,Hao Li,Changyu Shen,Le Wang,Shiqing Xu
The La 1-0.03- y Gd y AlO 3 : 0.03Eu ( y = 0.2–0.8) phosphors are prepared via solid phase method. The normal thermal quenching of Eu 2+ ion and abnormal thermal quenching of Eu 3+ ion in La 1-0.03- y Gd y AlO 3 : 0.03Eu ( y = 0.2–0.8) phosphors are explained by the configuration coordinate system and energy transfer process . Considering the fluorescence intensity ratio temperature measurement technology, the temperature sensitivity values of the phosphors increase with the increase of Gd 3+ ion concentration . When Gd 3+ ion concentration is 0.8, the maximal S a and S r can even reach 0.084 K -1 and 3.233% K −1 . Moreover, the excellent separation of emission peaks of Eu 2+ and Eu 3+ ions also provides good signal discriminability for temperature measurement. These results indicate that the La 1-0.03- y Gd y AlO 3 : 0.03Eu phosphors can be used as the superior non-contact optical thermometry materials.
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高影响因子
JOURNAL OF LUMINESCENCE
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2019
·
IF 2.961
Hai Guo,Zhigang Zheng,Liming Teng,Rongfei Wei,Fangfang Hu
In this paper, a series of Bi 3+ and Eu 3+ single-doped as well as Bi 3+ ,Eu 3+ co-doped Ba 9 Y 2 Si 6 O 24 samples were synthesized through a simple high-temperature solid-state reaction method. Their crystal structures, morphologies, luminescent properties, temperature-dependent emission spectra , decay curves and quantum efficiencies were investigated in detail. Upon ultraviolet light excitation, Bi 3+ single-doped samples exhibited blue and green emissions peaking at 408 and 501 nm, corresponding to the 3 P 1 – 1 S 0 transition of Bi 3+ ions. The spectral analysis indicated that there were two different luminescent centers of Bi 3+ ions due to different occupancies in Ba 9 Y 2 Si 6 O 24 host lattice. And the highest quantum efficiency can reach 64.5% in Ba 9 Y 2 Si 6 O 24 :0.024Bi 3+ phosphor. The remarkable spectral overlap between the emission spectra of Bi 3+ ions and the excitation spectra of Eu 3+ ions indicated the exist of energy transfer from Bi 3+ to Eu 3+ . The efficient energy transfer from Bi 3+ to Eu 3+ has been investigated in detail and resulted in that tunable and white-light emission can be obtained by modulating Eu 3+ doping concentration. White emission can be realized with the CIE coordinates of (0.357, 0.345) and quantum efficiency of 57.6% for Ba 9 Y 2 Si 6 O 24 :0.024Bi 3+ ,0.02Eu 3+ . The above results demonstrate that Ba 9 Y 2 Si 6 O 24 :Bi 3+ ,Eu 3+ may be a potential candidate for ultraviolet (UV) driven white light-emitting diodes (w-LEDs).
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高影响因子
Journal of Materials Chemistry C
·
2014
·Vol. 2
·期 42
·9004-9011
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IF 0
Zhuo Wang,Jing Feng,Shuyan Song,Zhiqiang Sun,Shuang Yao,Xin Ge,Min Pang,Hongjie Zhang
The pure and intense orange upconversion luminescence of Eu3+ was efficiently achieved in NaYF4 and NaLuF4 nanocrystals through the upconversion sensitization of doped Yb3+ and Mn2+ ions dimer for the first time. A shell-coating strategy was performed to further enhance the emission intensity. In this work, a novel upconversion mechanism for energy transfer from the Yb3+–Mn2+ dimer to the Eu3+ ion was proposed by analyzing the upconversion luminescence spectra, lifetimes and pumping photons measurements of the obtained nanocrystals in detail. The applications of the nanocrystals for CT imaging and ratiometric pH sensing in physiological pH range were performed. This study also provides a new upconversion spectral region at around 592 nm for applications in multicolor imaging, multiplexed encoding and detection.
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Journal of Materials Chemistry C
·
2015
·Vol. 3
·期 27
·7038-7044
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IF 4.696
Xiang Shen,Bing Yan
A classic anionic metal–organic framework (bio-MOF-1, Zn8(ad)4(BPDC)6O·2Me2NH2 (BPDC = biphenyl-4,4′-dicarboxylate, Ad = adeninate)) encapsulating Eu3+-β-diketonate complexes via cation exchange can be used for sensing volatile organic molecules, especially volatile amines, which is of great significance for environmental and industrial monitoring. Subsequently, the Eu3+-β-diketonate functionalized hybrid system can sensitively detect volatile organic amines by exhibiting a distinct color variation. This means the luminescence intensity of the 5D0 → 7F2 transition can be significantly enhanced in a basic environment such as diethylamine and dramatically decreased in an acidic environment like formic acid. The change in environment is accompanied by a colour change from bright red in diethylamine to light purple in formic acid.
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高影响因子
Journal of Materials Chemistry C
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2015
·Vol. 3
·期 31
·8132-8141
·
IF 4.696
W. B. Dai,S. Ye,E. L. Li,P. Z. Zhuo,Q. Y. Zhang
Yellow-emitting phosphors activated by Ce3+ are key components of white light-emitting diodes (LEDs) based on the blue (Ga,In)N LED. The need to replace incandescent and/or halogen lamps with warm white LEDs has driven LED phosphor development toward compositions beyond the Ce3+-doped garnets used in cool white LED packages. In this contribution, for pointing out how chemical substitutions play a crucial role in tuning the optical properties, we investigate the structural and optical properties of oxyfluoride solid-solutions and borate phosphors, specifically the (La,Ca)3(Al,Si)O4(O,F):Ce3+ yellow-green phosphors and the Ca3La3(BO3)5:Eu3+ red phosphors, via a combination of density functional theory, synchrotron X-ray detection, pair-distribution-function analyses and spectroscopy measurements. By incorporating these phosphors with a new phosphor-capping method on InGaN light-emitting diodes, we obtain the warm white light that meets the spectral and efficiency requirements for high-efficacy solid state warm white lighting lamps. We believe that solid-solutions between distinct and structurally related phosphor systems can be a good strategy to broaden possibilities for using in warm white LED phosphors.
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高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2017
·
IF 4.164
Guangjian Zeng,Meiying Liu,Ruming Jiang,Chunning Heng,Qiang Huang,Liucheng Mao,Junfeng Hui,Fengjie Deng,Xiaoyong Zhang,Yen Wei
We reported a simple and efficient method to prepare the hydrophilic luminescent HAp polymer nanocomposites through the combination of ligand exchange and metal free light initiated surface-initiated atom transfer radical polymerization (SI-ATRP) using 10-phenylphenothiazine (PTH) as organic catalyst and 2-methacryloyloxyethyl phosphorylcholine (MPC) and itaconic acid (IA) as monomers. The biological imaging and drug delivery performance of HAp-poly(MPC-IA) nanorods were examined to evaluate their potential for biomedical applications. Results suggested that hydrophilic HAp-poly(MPC-IA) nanorods can be successfully prepared. More importantly, the HAp-poly(MPC-IA) exhibited excellent water dispersibility, desirable biocompatibility and good performance for biological imaging and controlled drug delivery applications. As compared with other controlled living polymerization reactions, the metal free light initiated SI-ATRP displayed many advantages such as easy for handle, mild reaction conditions, toxicity and fluorescence quenching from metal catalysts. Therefore, we believe that this strategy should be a useful and effective strategy for preparation of HAp nanomaterials for biomedical applications.
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PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Shengqian Wang,Junqiang Gu,Jinying Liu,Feiyan Xie,Chaochao Tao,Shuo Wang,Hualan Xu,Shengliang Zhong
Phosphors with high luminescence efficiency, tunable emission and high color rendering index (CRI) are vital importance for the quality of white light emitting diodes (w-LEDs) in real application. In this work, a new single phase color-tunable Na 5 Lu(WO 4 ) 4 :Tb 3+ ,Eu 3+ phosphor with outstanding luminescent properties was designed and synthesized. Its crystal structure, electronic structure, and luminescence features were studied in detail. The band gap of the host was calculated to be about 4.68 eV. The differential charge distribution after Tb, Eu doping through density functional theory simulation theoretically proved the electron redistribution in the W-O bond upon substitution of Tb 3+ /Eu 3+ . The energy transfer of Tb 3+ →Eu 3+ enabled tunable emission of luminescent colors from green to orange-red due to the quadrupole-quadrupole interaction. The optimal Na 5 Lu(WO 4 ) 4 :60%Tb 3+ ,20%Eu 3+ phosphor exhibited excellent photoluminescence quantum yield of 84.19 % and good luminescent thermal stability (I 423K/298K = 75.90%) with an activation energy of 0.1976 eV. Finally, a white LED device with color coordinates of (0.3371, 0.3636), color rendering index of 89.4 and correlated color temperature of 5334 K was fabricated. These findings demonstrated that Na 5 Lu(WO 4 ) 4 :60%Tb 3+ ,20%Eu 3+ phosphor could be a potential orange-red-emitting color converter for white LEDs. This work not only assisted in the understanding of experimental observations but also provided a theoretical basis for the rational design of phosphors.
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高影响因子
Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 22
·5411-5419
·
IF 5.256
Yajuan Li,Xudong Yu,Tao Yu
A novel Eu-containing SBA-15 mesoporous hybrid material with multicolor emission modulated by fluoride ion was synthesized. First, the organic ligand 1-(2-naphthoyl)-3,3,3-trifluoroacetonate (NTA) was modified by the silane coupling agent 3-(triethoxysilyl)propylisocyanate to form an alkene precursor (NTA-Si), which was covalently grafted onto a mesoporous SBA-15 backbone through co-hydrolysis and co-condensation reactions; as a result, mesoporous hybrid NTA-S15 was obtained. 2-(2-Carboxylphenyl)-imidazo[4,5-f]-1,10-phenanthroline (L) was used as the second ligand, whose two pyridine N atoms coordinate with europium ions and sensitize the luminescence of Eu3+, and the NH group of the imidazole ring and –COOH group formed hydrogen bonds with fluoride ions. Finally, after the coordination reaction between Eu3+ and the organic ligands (NTA-S15 and L), the mesoporous hybrid material Eu(NTA-S15)3L was obtained. Fourier transform infrared, small-angle X-ray diffraction, N2 adsorption measurements, transmission electron microscopy, and scanning electron microscopy were performed, and photoluminescence spectra and thermogravimetric plots were characterized. The results show that Eu(NTA-S15)3L displays a high surface area, uniform mesostructure, good thermal stability, and excellent photophysical properties. Furthermore, Eu(NTA-S15)3L exhibits a highly sensitive sensing function toward the fluoride ion. More importantly, tunable multicolor emissions, which cover nearly the entire visible region, can be readily achieved by varying fluoride ion concentrations under a single-wavelength excitation.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Tenglong Sun,Man Nie,Mengmeng Meng,Bingpeng Li
White light-emitting diodes (wLEDs) face challenges in achieving both high efficiency and color quality due to limitations in conventional phosphor-in-glass (PiG) materials. To address this, we developed an active glass matrix by doping borosilicate glass (B 2 O 3 -SiO 2 -K 2 O-Al 2 O 3 ) with Eu 3+ ions, which serves as both a host and red emitter for Lu 3 Al 5 O 12 : Ce 3+ (LuAG) phosphor. The resulting PiGEuB-1LCe composite shows excellent interfacial stability and retains 94.5 % of its luminescence intensity at 473 K. Under 400 nm excitation, the optimized PiG produces balanced white light with a high color rendering index (CRI) of 80.1 and tunable correlated colour temperature (CCT, 5146 K), demonstrating superior performance for next-generation wLED applications.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2025
·
IF 3.6
Zihao Han,Zhihao Jiang,Jianwei Dao,Tiqun Wei,Zhenglin Jiang,Zhicheng Lv,Liang Yang
To advance artificial-light plant cultivation and high-performance white light-emitting diodes (LEDs), a phosphor combining excellent luminous thermal stability with superior luminescence is essential. In this work, the high-thermal-stability Ca 3 Bi(PO 4 ) 3 (CBPO): Eu 3+ red phosphors were successfully synthesized via high-temperature solid-state method. The performance of LEDs fabricated with the phosphors is enhanced in the far-red light region. When combined with commercial blue and green phosphors, the resulting white LEDs achieve high color rendering index (R a = 90.3) and low correlated color temperature (CCT = 4898 K). Upon near-ultraviolet (n-UV) excitation, the CBPO: Eu 3+ phosphors exhibit bright red emission at 615 nm, achieving optimal performance at a doping concentration of 0.24. At temperature of 423 K (150 °C), the luminescence intensity of the CBPO: 0.24Eu 3+ phosphor retained 71.9% of room-temperature value, demonstrating its good luminous thermal stability. The fabricated red LEDs with high color purity and spectral characteristics closely matching the absorption properties of plant photosensitive receptor proteins, enhance photosynthetic efficiency and underscore their substantial application potential in plant growth. The fabricated white LEDs can emit bright white light, with R a and R 9 values of 90.3 and 62, which are significantly higher than the standard R a (80) and R 9 (30) of commercial phosphors. We conducted a plant growth experiment in the laboratory, demonstrating that the fabricated red LEDs effectively supplement plant illumination and promote growth. These results demonstrate that the prepared CBPO: Eu 3+ red phosphors hold significant potential for applications in both plant growth lighting and white LEDs.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yi Zhang,Peng Wang,Bibo Lou,Shengjie Niu,Haonian Bai,Dan Zhang,Chong-Geng Ma
To fulfill the escalating demand for high-quality white lighting, the exploration of novel and advanced luminescent materials holds a significant role in addressing the issues of reabsorption, color bleaching and deviation in modern WLED solid-state lighting technology based on phosphor-converted materials. In this research, a series of novel Bi 3+ -activated gallium-germanate luminescent materials Sr 2 Ga 2 GeO 7 (SGGO): Bi 3+ were synthesized by means of the classic high-temperature solid-phase method. A comprehensive exploration of their crystal structure, electronic structure, and optical transition properties were conducted through a combined experimental and theoretical calculation analysis. The research outcomes suggest that Bi 3+ , which is prone to occupying Sr sites, shows a remarkable blue emission with a peak at approximately 450 nm throughout the entire spectral range from near ultraviolet (UV) to near infrared when excited at 315 nm, and this is attributed to the 3 P 1 → 1 S 0 transition. Additionally, by devising an efficient energy transfer strategy from Bi 3+ to Eu 3+ , single-component white light can be attained by merely adjusting the doping concentration of Eu 3+ in the SGGO: Bi 3+ , Eu 3+ co-activation system. Eventually, devices packaged based on 310 nm ultraviolet chips also demonstrate the potential application of the synthesized material in WLEDs. These findings contribute to a deeper understanding of the luminescence and energy transfer mechanisms of Bi 3+ -activated systems, and also offer essential guidance for the advancement of high-performance Bi 3+ -doped advanced light-conversion materials and effective materials for various applications demanding enhanced light conversion properties.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Yan Shen,Tianjing Zhang,Haoran Zhao,Yu Xiao,Jie Hong,Mohamed Abbas,Wanliang Yang
Portable and reusable solid-state fluorescence sensors have received much attention in the field of metal ion detection as a superior alternative to traditional liquid-based fluorescence sensors. In this study, a novel HHSS@LaVO 4 :Eu 3+ /polyacrylamide/sodium alginate (HLE/PS) hydrogel was successfully constructed for portable dynamic fluorescence switching detection of Fe 3+ and encryption of security information. The HLE/PS hydrogel was synthesized from HHSS@LaVO 4 :Eu 3+ fluorescent nanofillers embedded in a semi-IPN network of polyacrylamide (PAM) and sodium alginate (SA). The HLE/PS hydrogel has demonstrated excellent performance in the detection of Fe 3+ in aqueous solutions with high selectivity, high sensitivity, fast response (8 min), wide detection range (2–1000 μM), low detection limit (0.78 μM) and ease of use. It can be reused up to five times, underlining its utility and economy as a good performance fluorescence sensor. Notably, the quenching of Fe 3+ fluorescence by ultrasmall LaVO 4 :Eu 3+ nanoparticles on HHSS supports was significantly enhanced compared to conventional large-sized rare earth phosphor fillers. Additionally, by exploiting the reversible fluorescence switching function of the HLE/PS hydrogel, we further developed a high-security multi-layer information encryption platform. Finally, we thoroughly investigated the fluorescence response mechanism of HLE/PS hydrogels to Fe 3+ ions. This work not only provides a representative case for the preparation of packed rare-earth fluorescent hydrogels, but also demonstrates their potential as multifunctional smart luminescent materials.
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高影响因子
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