Materials Chemistry Frontiers
·
2025
·
IF 6.4
Lanxuan Yang,Lili Liu,Xu Ding,Ruili Xu,Tian Tian,Zhifu Liu,Lianjiang Tan,Yaoqing Chu
The asymmetry of the local environment within host materials plays a critical role in enhancing the emission performance of Eu3+ ions. In this study, we introduced a novel Si4+-doping strategy to optimize the luminous properties of Eu3+ ions by promoting asymmetry in the local lattice environment. And then, a series of Si4+/Eu3+ co-doped Sr3Ga2Ge4O14 phosphors were synthesized. Our findings reveal that Si4+-doping at a concentration of 60 mol% significantly enhances the emission intensity of Eu3+ ions in the Sr3Ga2Ge4O14 host by approximately 80%. Also, the internal quantum efficiency increases from 37.80% to 49.04%, alongside a rise in color purity from 87.40% to 99.80%. Utilizing this Sr2.3Ga2Ge1.6Si2.4O14:0.7Eu3+ high-performance red phosphor, we fabricated a white light-emitting diode (WLED) device with natural white light characteristics, achieving CIE coordinates of (0.338, 0.323), a correlated color temperature (CCT) of 5636 K, and a color rendering index (CRI) of Ra = 89.4. Additionally, we developed a high-performance anti-counterfeiting ink using this red phosphor, which adheres uniformly to surfaces with varying roughness and delivers exceptional luminescence effects. This study provides new insights into the development of advanced red-emitting phosphors for applications in lighting and anti-counterfeiting technologies.
研究领域:
材料科学
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光学工程
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Zhanglin Chen,Wei Cui,Kaiming Zhu,Chunguang Zhang,Chuandong Zuo,Yude Niu,Qi Wang,Xuanyi Yuan,Guanghua Liu
An orange-red emitting Mn 2+ /Si 4+ co-doped AlN phosphor was prepared by an efficient combustion synthesis method. Phase identification and structure characterization were performed using powder X-ray diffraction (XRD) and refined by the Rietveld method. Luminescence and afterglow properties of the AlN-based phosphors such as photoluminescence spectra (PL), CIE values, afterglow decay curves, thermoluminescence glow curves (TL) were systematically studied. Using the Tanabe-Sugano diagram, the Racah parameters B , C , and crystal field splitting parameter Dq of as-prepared phosphor were calculated to be 812 cm −1 , 2168 cm −1 , and 780 cm −1 , respectively. The luminescence intensity and afterglow time were increased, respectively, by about 1.1 and 2.2 times after 3% Si 4+ co-doping. Particular attention was paid to study the mechanism of Si 4+ co-doping on improving luminescence properties using a combination of the above-mentioned method and X-ray photoelectron spectroscope (XPS). Two hypothetical stress cancellation and charge rebalance effects due to Si 4+ co-doping were discussed. Besides, it was found a shallower trap level (0.56 eV, compared to 0.84 eV for those without Si 4+ co-doping) was formed after the co-doping of Si 4+ , which results in enhanced afterglow performance.
研究领域:
材料科学
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光学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 7
·4712-4720
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IF 2.779
Wu Guofa,Ma Mingtao,Li Aihua,Song Kaixin,Khesro Amir,Bafrooei Hadi Barzegar,Taheri-nassaj Ehsan,Luo Shaojin,Shi Feng,Sun Shikuan,Wang Dawei
In this article, garnet-type Y 3 Al 5 O 12 (YAG) were doped with Mg 2+ -Si 4+ ionic pairs and its effect on the structure and the microwave dielectric properties was investigated. It was revealed that in ceramics Y 3 Mg x Al 5-2 x Si x O 12 ( x = 0, 0.5, 1.0, 1.5, 2.0), increasing doping concentration decreased the sintering temperature and time for the optimal densification. X-ray diffraction studies showed that the samples are isostructural to Al 5 Y 3 O 12 garnet. All sample were formed a single phase except for x = 2.0, where a secondary peak was detected. Excellent microwave dielectric properties of ε r = 10.56, Q × f = 67,571 GHz and τ f = -35.23 ppm/°C were obtained for Y 3 Mg 0.5 Al 4 Si 0.5 O 12 ceramics sintered at 1625 °C for 5 h. The factors influencing the microwave dielectric properties of Y 3 Mg x Al 5-2 x Si x O 12 ceramics were further discussed by considering the ionic polarization, packing fraction, average grain size and chemical bond valence theory.
研究领域:
材料科学
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电子材料
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DOI
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Yun Wang,Zhiyuan Pan,Sihan Feng,Lijie Gao,Xuejiao Wang,Qi Zhu,Ji-Guang Li
Near-infrared (NIR)-emitting phosphors with high quantum efficiency and thermal stability are crucial to NIR pc-LEDs. Garnet-structured (GdLuCa)(Al4–zSiCrz)O12 (z = 0.01–0.2) and (Gd2–xLuCax)(Al4.95–xSixCr0.05)O12 (x = 0.2–1.0) new phosphors with promising NIR luminescence under blue light excitation were designed and fabricated by a solid-state reaction in this work. It was analyzed that the Ca2+, Cr3+, and Si4+ ions would replace Gd3+ in [GdO8], Al1 in [Al1O6], and Al2 in [Al2O4], respectively, and the optimal Cr3+ content is z = 0.05, above which concentration quenching would occur via an electric dipole–dipole interaction. Increasing Ca2+/Si4+ substitution up to x = 1.0 led to luminescence enhancement by a factor of up to 1.85 and internal/external quantum efficiency (%) increment from ∼25.9/10.7 to 63.4/27.5, and all of the phosphors showed excellent thermal stability (I423 K/I298 K ≥ 87.6%). The luminescence properties of Cr3+ were discussed in detail through systematic investigation of the effects of Cr3+ and Ca2+/Si4+ contents on the crystal structure, local coordination, and crystal field. With the NIR pc-LED device integrated from the optimal phosphor (x = 1.0) and a blue LED chip, electroluminescence manifested potential applications in night vision and medical diagnosis.
研究领域:
材料科学
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光学工程
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2020
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IF 4.495
Qinghong Meng,Xuejiao Wang,Qi Zhu,Ji-Guang Li
A series of phase-pure [(Gd 0.6 Lu 0.4 ) 0.99 Ce 0.01 ] 3 [Al 1- z (Mg/Si) z ] 5 O 12 ( z = 0-0.10) garnet phosphor powders were prepared via gel-combustion, which were then sintered into ceramics (up to 1550 °C) under atmospheric pressure. Dilatometry revealed that equimole of Mg 2+ /Si 4+ substitution for Al 3+ accelerates densification and lowers the activation energy for grain boundary diffusion in the intermediate stage of sintering (∼1150–1370 °C), which was assayed to be ∼353 kJ/mol for z = 0 and ∼289 kJ/mol for z = 0.10. The acceleration effects of Mg 2+ /Si 4+ on sintering and grain growth were further demonstrated by the results of ramp and holding sintering. Firing at 1550 °C for 4 h also produced ∼99 % dense ceramics for the Mg 2+ /Si 4+ codoped garnet powders. Through considering crystal splitting of the Ce 3+ 5d energy level, photon-phonon coupling, and crystal structure/microstructure, the influences of Mg 2+ /Si 4+ content and material form on Ce 3+ luminescence, including intensity, external/internal quantum efficiencies, emission wavelength, CIE color coordinates and decay time, were clarified in detail.
研究领域:
材料科学
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光学工程
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DOI
高影响因子
DALTON TRANSACTIONS
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2022
·Vol. 51
·期 8
·3159-3169
·
IF 4.569
Qinghong Meng,Guoying Zhao,Qi Zhu,Xudong Sun,Ji-Guang Li
Doping Gd2LuAl5O12:Ce with a Ca2+/Si4+ pair produced a series of Gd1.97−xLuCaxAl5−xSixO12:0.03Ce (x = 0.0–1.2) garnet new phosphors, and remarkable regulation of the crystal structure and Ce3+ luminescence was achieved. Rietveld refinement and spectral analysis revealed that greater incorporation of Ca2+/Si4+ led to a higher lattice rigidity by cell contraction, a narrower bandgap, a longer average bond length/less distortion of the [CeO8] dodecahedron and decreased centroid shift/crystal field splitting of the Ce3+ 5d energy level. A blue-shifted 4f–5d1 transition, a narrower emission band, improved thermal stability of luminescence and a shorter fluorescence lifetime were observed with increasing Ca2+/Si4+ content. Applying the yellowish-green-emitting Gd0.77LuCa1.2Al3.8Si1.2O12:0.03Ce optimal phosphor (x = 1.2), together with a commercial CaAlSiN3:Eu red phosphor, in 450 nm-excited LED lighting produced a low CCT of ∼3625 K and a high CRI/R9 of ∼95.2/94.8, indicating that the phosphor has application potential in high-performance w-WLED.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Taifang Zhang,Dan Zhang,Zeyu Gao,Baoqi Ai,Valery F. Gremenok,Peng Wang,Chonggeng Ma
The advancement in the development of high-efficiency cyan-green emitting phosphors is pivotal for achieving high-color-quality full-visible-spectrum white light-emitting diodes (WLEDs). In this study, a series of novel cyan-green emitting BaLu 2 Al 3 ScGe 1- y Si y O 12 : x Ce 3+ (BLASGe 1- y Si y O: x Ce 3+ ) phosphors were successfully synthesized. X-ray diffraction analysis confirmed that all samples possess a typical garnet crystal structure, belonging to the Ia 3 ̅ d space group. The emission spectra of these BLASGe 1- y Si y O: x Ce 3+ phosphors effectively bridge the “cyan gap” within the 480–520 nm cyan-green emission region. Under 438 nm blue light excitation, the prepared BLASGO: Ce 3+ phosphor exhibits broad-band cyan-green emission with an emission peak at 504 nm and a full width at half maximum (FWHM) of 103 nm, thereby significantly enhancing cyan emission while preserving green emission. More importantly, by substituting Ge 4+ ions with smaller Si 4+ ions, the internal quantum efficiency (IQE) and thermal stability of the phosphor are markedly improved due to the highly symmetrical rigid structure. The optimized BLASSO: Ce 3+ phosphor demonstrates superior cyan-green emission performance with a high internal quantum efficiency of 93.28 % (an enhancement of 31.23 %) and thermal stability increased to 69.62 %. Based on the developed BLASSO: Ce 3+ cyan-green phosphor, a high-performance full-visible-spectrum WLED device was successfully fabricated, featuring a high color rendering index (CRI or R a , R a = 93.4) and a low correlated color temperature (CCT = 2814 K).
研究领域:
材料科学
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光电子学
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固态照明
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荧光粉化学
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发光材料
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Wenlei Liu,Jianxing Shen,Qingle Pang,Tailin Wang,Xiujun Han
Cerium-doped yttrium aluminum garnet (YAG:Ce) based transparent ceramics have been widely used in fluorescent lighting as high-quality inorganic fluorescent conversion materials. This paper further explores the Mg 2+ -Si 4+ ions doped YAG:Ce transparent ceramics by combining the solid-phase reaction method with vacuum hot-pressure sintering and implementing protection measures against hot-pressure mold contamination, and also investigates the effect of different Mg 2+ -Si 4+ doping contents on the structure, transmittance and luminescence properties of the ceramics under hot-pressure sintering. In this work, pure-phase YMASG:Ce transparent fluorescent ceramics with a grain size of about 3-6 μm and clear and clean grain boundaries were obtained with an In-line transmittance of 67% at 800 nm. Under the excitation at 460 nm, the emission peak was red-shifted by 26 nm and the full width at half maxima (FWHM) was broadened with the increase of Mg 2+ -Si 4+ content, which shows that the Mg 2+ -Si 4+ ion pair effectively complements the absence of the red light component in the YAG:Ce emission spectrum. The optimized YMASG:Ce ceramics obtained high-quality warm white light with a low correlated color temperature (CCT) and a high color rendering index (CRI) under the excitation of the blue LED chip. This work proved the feasibility of vacuum hot-pressure sintering to prepare YMASG:Ce transparent fluorescent ceramics, and provided a new approach for studying YMASG:Ce-based ceramics, which was significant for the application of high-power visible laser illumination.
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Yuping Hou,Ning Wang,Xiaofei Wu,Guibin Hu,Guihua Li,Shuai Cheng,Zhenyu He,Yusong Du,Jingtai Zhao
Manganese-doped calcium germanate was used as the model host to optimize dual-mode emission by synergistic regulation at the B site. A series of Ga 3+ -doped samples was first prepared to determine the composition with the strongest mechanoluminescence (ML) response. A small amount of Si 4+ was then introduced to recover the photoluminescence (PL) performance. The Ga 3+ /Si 4+ co-doping strategy combines defect construction with lattice rigidification. Heterovalent Ga 3+ substitution creates an oxygen-vacancy trap network, which preserves the energy-storage capability required for ML. Isovalent Si 4+ incorporation strengthens the lattice framework through highly stable Si-O bonds, thereby suppressing non-radiative relaxation of Mn 2+ and compensating for the defect-induced energy loss. Thermoluminescence (TL), Raman spectroscopy, and optical characterizations show that B-site regulation modifies both trap distribution and lattice rigidity. As a result, PL and ML are simultaneously improved. This work provides a structural-regulation strategy for designing multimodal luminescent materials.
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2026
·
IF 3.8
Jianan Wang,Fu Du,Jiangyan Xu,Jiaqing Peng,Yipeng Liu,Yali Sun,Daowang Liu,Decai Huang,Xinyu Ye
Mini/Micro-LED backlight systems require color conversion layers that combine submicron size with high absorption efficiency. However, commercial phosphors are difficult to meet this demand due to their relatively large particle size. The Cs 2 MnF 6 system demonstrates a unique advantage due to its intrinsic high absorption efficiency. In this study, submicron-sized Cs 2 MnF 6 was successfully prepared via anti-solvent synthesis method. Furthermore, a Si 4+ reverse doping strategy was employed (Cs 2 MnF 6 :Si 4+ ) to effectively suppress concentration quenching. At the optimal doping concentration, the emission intensity reaches 3523 times that of the undoped Cs 2 MnF 6 host. Subsequently, surface passivation treatment was applied with a Mn 4+ -free Cs 2 SiF 6 coating. This treatment not only suppressed surface quenching, further increasing the luminescence intensity, but also significantly improved the material's moisture resistance. The finally obtained Cs 2 MnF 6 :Si 4+ @Cs 2 SiF 6 phosphor has an average particle size of approximately 800-900 nm and a high absorption efficiency of 48.4%. Its luminescence intensity is 4.25 times that of the un-passivated sample. And this material retained 75% of its initial luminescence intensity after 240 minutes of immersion in deionized water. In contrast, the untreated sample remained only 16.4%. These advancements highlight the significant potential of this material in mini/micro-LED backlight systems, offering new possibilities for the development of next-generation display technologies.
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Lanxuan Yang,Lianjiang Tan,Ruili Xu,Zeyuan Tian,Tian Tian,Zhifu Liu,Lili Liu,Yaoqing Chu
The local crystal-field symmetry within a host material plays a critical role in modulating the luminescence behavior of Sm 3+ ions. In this study, we propose a novel Si 4+ doping strategy to enhance the photoluminescence properties of Sm 3+ in a Sr 3 Ga 2 Ge 4 O 14 host, with the effects proposed to be associated with alterations in the symmetry of the local coordination environment. A series of Si 4+ /Sm 3+ co-doped phosphors was synthesized via solid-state reaction. At an optimal Si 4+ doping level of 50 mol%, the emission intensity of Sm 3+ increased by approximately 40%. Further introduction of K + as a charge compensator considerably improved the internal quantum efficiency from 25.12% to 47.28% and color purity from 96.8% to 99.9%. A prototype WLED using the optimized phosphor exhibited a low CCT (5769 K) and a high CRI ( R a = 87.6), satisfying the requirements for indoor lighting. The phosphor was also incorporated into a PVA-based anti-counterfeiting ink, showing bright, stable, and substrate-independent UV-excited fluorescence. This work provides a feasible doping strategy for developing high-performance orange-red phosphors and demonstrates their potential in high-quality WLED and advanced anti-counterfeiting applications.
研究领域:
材料科学
·
光子学
·
固态化学
·
光电子器件
·
发光材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 4
·2116-2124
·
IF 2.779
Li Chen,Hou Jiale,Ye Zijun,Muhammad Raz,Li Aihua,Ma Mingtao,Wu Guofa,Song Kaixin,Zhou Tao,Mao Minmin,Liu Bing,Bafrooei Hadi Barzegar,Taheri-nassaj Ehsan,Luo Shaojin,Shi Feng,Sun Shikuan,Wang Dawei
In this study, Mg x Y 3- x Al 5- x Si x O 12 ( x = 0–0.6) ceramics were prepared via a high-temperature solid state method. Mg 2+ and Si 4+ replacing Y 3+ ions at A-site and Al 3+ at C-site in garnet-type Y 3 Al 5 O 12 (YAG) ceramics were designed to discuss the effects of crystal structure, microstructure on microwave dielectric properties for the first time. Liquid phase sintering induced by doping of Mg 2+ -Si 4+ , significantly decreased the sintering temperature and time for the densification of YAG ceramics. X-ray diffraction of the samples showed single phase for x ≤ 0.5, while a secondary phase of MgAl 2 O 4 formed for x = 0.6. From the Rietveld analysis, a decrease in lattice dimensions, bond length and valence and rattling effect were observed, while Raman results showed a change in FWHM of the Eg mode. Based on these parameters, a structure–property relation was developed for Mg x Y 3- x Al 5- x Si x O 12 ceramics. Specially, Mg 0.1 Y 2.9 Al 4.9 Si 0.1 O 12 showed a good set of microwave dielectric properties sintered at 1575 °C for 4 h with ε r = 10.67, Q × f = 58,799 GHz, τ f = -29.5 ppm/°C.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
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