Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 34
·10471-10480
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IF 6.641
Liangling Sun,Balaji Devakumar,Jia Liang,Shaoying Wang,Qi Sun,Xiaoyong Huang
Inorganic phosphors play an important role in realizing high-performance white light-emitting diodes (LEDs), and thus highly luminescent phosphors with excellent optical properties are urgently needed. In this paper, novel Ce3+/Tb3+ co-doped Ca2YZr2(AlO4)3 (abbreviated as: CYZA) green-emitting phosphors with broadband excitation and high quantum efficiency were synthesized for potential application in white LEDs, and their phase purity, crystal structure, morphology, photoluminescence properties, energy transfer mechanism, and thermal stability were systematically investigated. It was found that the CYZA:Ce3+,Tb3+ phosphors exhibited two broad excitation bands in the 300–470 nm wavelength range, due to the highly efficient energy transfer from Ce3+ to Tb3+ ions. Under the excitation wavelength of 408 nm, the CYZA:Ce3+,Tb3+ phosphors showed bright green emissions around 492, 543, 591, and 628 nm originating from the 5D4 → 7FJ (J = 6, 5, 4, and 3) transitions of Tb3+ ions. The optimal doping concentrations of Ce3+ and Tb3+ ions in CYZA:xCe3+,yTb3+ phosphors were determined to be x = 0.04 and y = 0.9, respectively. The CIE coordinates and the internal quantum efficiency of the composition-optimized CYZA:0.04Ce3+,0.9Tb3+ phosphors were measured to be (0.342, 0.545) and 56%, respectively. The full width at half-maximum (FWHM) of the dominant green emission band around 543 nm was only about 13.5 nm. Finally, a white LED lamp was fabricated using a 400 nm LED chip together with a phosphor blend of blue-emitting BaMgAl10O17:Eu2+, green-emitting CYZA:0.04Ce3+,0.9Tb3+ and red-emitting CaAlSiN3:Eu2+, which produced warm white light with color coordinates of (0.419, 0.392), excellent color rendering index of 91, correlated color temperature of 3233 K, and luminous efficacy of 30 lm W−1 when driven by a 40 mA current. The above results demonstrated that CYZA:0.04Ce3+,0.9Tb3+ can be a potential green-emitting color converter for white LEDs.
研究领域:
材料科学
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2025
·
IF 4.2
Liang Dong,Ziying Wang,Sihan Yang,Qi Zhu,Ji-Guang Li,Xuejiao Wang
Phosphor-converted white light-emitting diode (pc-WLED) is crucial for solid-state lighting, but the color rendering index of commercial pc-WLED needs to be improved. In this study, a series of silicates KSrScSi 2 O 7 : x Ce 3+ ( x= 0-10at%) were synthesized. Under the 365 nm near-ultraviolet excitation, the silicate emits a high-quality broadband cyan-blue light (385-550 nm) covering the cyan gap. The emission intensity reaches its maximum at approximately 450 nm and the emission peak is slightly shifted with varying Ce 3+ concentration, which is because Ce 3+ doping changes the crystal field around the luminescence center. The prepared phosphors showed promising properties for application in high-color rendering lighting. The crystal structure analysis via X-ray diffraction and Rietveld refinement and Gaussian fitting of the PL spectra indicated that Ce 3+ occupies the Sr 2+ and K + positions in the monoclinic host lattice. The optimal Ce 3+ content is 3at% and concentration quenching is attributed to the non-radiative energy transfer between the nearest-neighboring Ce 3+ ions. The temperature-dependent luminescence showed that the T 50 is 394 K for the KSrScSi 2 O 7 : x Ce 3+ materials. The thermal quenching is attributed to increased lattice vibrations and enhanced non-radiative transitions at elevated temperatures. The performance of the pc-WLED device fabricated with KSrScSi 2 O 7 : 3at%Ce 3+ was studied, and the device showed a high-color rendering index (Ra=93.8) and exceptional stability during operation.
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
Materials Today Chemistry
·
2021
·
IF 8.301
Zongjie Zhang,Balaji Devakumar,Shaoying Wang,Liangling Sun,Nan Ma,Wei Li,Xiaoyong Huang
White light-emitting diodes (LEDs) with high color rendering index (CRI) and low correlated color temperature (CCT) are desirable for next-generation solid-state lighting. In this work, we demonstrated an efficient near-UV-excited cyan-emitting phosphor based on Ce 3+ -doped Ca 2 LuHf 2 Al 3 O 12 (CLHAO) garnet , which could be used to cover the cyan gap for fabricating high-CRI warm-white LEDs. We found that the CLHAO:Ce 3+ samples exhibited a broad excitation band in the 300–450 nm wavelength range peaking at 400 nm, and upon 400 nm excitation they showed broad cyan emission bands in the 420–600 nm spectral region with peak positions ranging from 477 to 493 nm. The optimal CLHAO:0.02Ce 3+ sample had CIE color coordinates of (0.160, 0.255), and its internal and external quantum efficiencies were measured to be 84.3% and 60.8%, respectively. Impressively, the luminescence intensity of CLHAO:0.02Ce 3+ sample at 423 K still remained at 62% of the initial value at 303 K, and the chromaticity shift was calculated to be as low as 1.7 × 10 −2 , revealing its high thermal stability and color stability at a higher temperature. Finally, a warm-white LED device (CCT = 3,194 K) was fabricated by combining CLHAO:0.02Ce 3+ cyan phosphors with commercial blue/green/red tricolor phosphors, showing bright white-light emission with a high CRI of 89.4, which was superior to that of another warm-white LED device (CRI = 83.2) fabricated without CLHAO:0.02Ce 3+ cyan phosphors. These outstanding luminescence properties of CLHAO:Ce 3+ cyan phosphors illustrated that they offer a new feasible approach for the production of high-CRI warm-white LEDs toward high-color-quality solid-state lighting.
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 THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Sikai Wang,Minghui Kang,Xiaoxin Zheng,Xusheng Qiao,Ci Wang,Lu Liu,Jing Ren,Jianzhong Zhang
Controllable growth of nanocrystals (NCs) in optical glasses is essential to impart photonic functions for demanded applications. Here, Ce 3+ -doped KLaF 4 and LaF 3 fluoride NCs are controllably precipitated in a fluorosilicate glass via adjusting the duration and temperature of thermal treatment. The presence of phase separation in the precursor glass (PG) is derived from molecular dynamics (MD) simulations, and serves as the driving factor for the crystallization of fluoride NCs. The phase separation of PG, NCs distribution, microscopic morphology and particle size of NCs precipitated in the nano-glass composites (nano-GCs) are investigated by analytical transmission electron microscopy (TEM). Structural and spectroscopic characterizations confirm the influence of the thermal treatment on the crystalline species in the nano-GCs. The developed nano-GCs exhibit intense X-ray excited luminescence with an excellent linearity with the X-ray dosage and a good thermal stability, making them suitable for radiation detection and medical imaging applications.
研究领域:
材料科学
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
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2024
·
IF 2.7
Xue Xing,Weiwei Cao,Zhaoxin Wu,Xiaohong Bai,Jiarui Gao,Xiaozhen Liang,Bo Wang,Chao Wang,Dalian Shi,Linwei Lv,Yonglin Bai
A series of ZnS 0.75 O 0.25 :0.1%Ce 3+ , x %Tb 3+ phosphors were prepared by high temperature solid state reaction method. These phosphors exhibited two mixed phases consisting of hexagonal phase ZnS and hexagonal phase ZnO with the average particle size of 13.83 μm and emitted blue-green light. The luminescence mechanism consisted of Zn vacancy defects, the 5d 1 → 2 F 5/2 radiative transitions of Ce 3+ , the 5 D 4 → 7 F 5 and 5 D 4 → 7 F 6 radiative transition of Tb 3+ induced by the energy transfer of Ce 3+ → Tb 3+ . An equation for the variation of the fluorescence lifetime of ZnS 0.75 O 0.25 :0.1%Ce 3+ , x %Tb 3+ phosphors with concentration of Tb 3+ fraction was obtained by exponential fitting. The short fluorescence lifetime could be tuned within the range of 113 μs to 550 μs with the increase of Tb 3+ concentration, and the color was tunable from blue to blue-green, which is of important application in the field of high-energy particle detection.
研究领域:
材料科学
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光学
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DOI
高影响因子
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
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2020
·
IF 1.265
Junjie Li,Jinghong Song,Weiwei Li,Bingchu Mei,Zuodong Liu,Yongqiang Zhang
In this study, high concentration (5 mol%) of cerium doped barium fluoride transparent ceramic was fabricated by hot pressing method t a temperature of 1200 °C under 30 MPa. XRD (X-ray Diffraction), SEM (Scanning Electron Microscope), PLE (Photoluminescence Emission) measurements was used to investigate the phase composition, microstructure as well as photoluminescence properties of Ce 3 + : BaF 2 . XEL (X-ray Excited Luminescence) and pulse height spectrum were used to investigate the scintillation properties of this ceramic. The phase composition and microstructure analyses showed that the Ce 3 + : BaF 2 precursor nanoparticles prepared by the co-precipitation method were uniform and have a average size of 25 nm. The highest transmittance of the ceramic was 77% at the wavelength of 2300 nm. The PL (photoluminescence) spectrum showed that the 5d–4f transition of Ce 3 + : BaF 2 transparent ceramic is located at 340 nm. X-ray excited luminescence exhibited only one violet peak at 392 nm. Scintillation decay time measurements showed only a slow component of 437 ns under 662 keV gamma excitation.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Ciyang Zhang,Tianxiang Hang,Ming Yang,Linrui Li,Haiyan Jing,Keren Lu,Haojie Li,Mingzhu Xia,Qingli Hao,Xifeng Xia,Wu Lei
A vascular-inspired CNT-based system was developed for self-healing corrosion protection. • pH-triggered PDA shell rupture enables controlled Ce 3+ release at corrosion sites. • DA and Ce 3+ synergistically suppress corrosion on metal surfaces. • Network structure reinforces tensile strength and elongation of epoxy matrix. Metal corrosion threatens public safety and assets. Here, we developed a vascular-inspired carbon nanotube (CNT) epoxy coating (PDA@Ce-CNT/EP) that couples pH-triggered inhibitor release with preferential migration to extend protection. Ce 3+ was loaded into expanded CNT nanochannels by vacuum–air cycling and confined within a polydopamine (PDA) shell that exhibits pH-responsive permeability under corrosive conditions, while the CNT nanonetwork promotes localized release and enrichment of inhibitors at damaged regions. After 75 days of immersion in 3.5 wt% NaCl solution, the PDA@Ce-CNT/EP coating maintained a low-frequency impedance modulus of 9.44 × 10 10 Ω·cm 2 at 0.01 Hz, which remained significantly higher than that of neat EP under identical conditions. It also exhibited enhanced strength and toughness, with tensile strength increasing from 2.80 to 3.99 MPa and elongation at break rising from 38.23% to 50.38%. These improved properties stem from the synergy among Ce 3+ , the PDA shell, and the vascular-like CNT network, a system that simultaneously obstructs corrosive species penetration and promotes uniform stress distribution. This strategy integrates controlled and corrosion-responsive inhibitor release within a hierarchical CNT-based nanostructure, thereby enhancing localized self-healing corrosion protection and providing an alternative design concept for intelligent self-healing coating systems. Download: Download high-res image (408KB) Download: Download full-size image
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Weihao Fan,Huaiyuan Wang,Chijia Wang,Zhanjian Liu,Yanji Zhu,Kaka Li
CeO 2 -PANI conductive polymer capsules were prepared by in-situ chemical oxidation polymerization. The capsules were dispersed in F51 epoxy resin and then sprayed onto the steel surface to form novel coatings after curing. The corrosion resistance of coatings was investigated by EIS in a 3.5 wt% NaCl solution. After 30 days, the 60-μm-thin coating containing CeO 2 -PANI capsules exhibited the highest corrosion resistance, and its impedance modulus was higher than 10 9 Ω·cm 2 , which was 10 times that of conventional PANI-Epoxy coatings. This improvement was attributed to the (Fe 3 O 4 + γ-Fe 2 O 3 + CeO 2 ) passive film actively formed by the synergistic effect of PANI and Ce 3+ ions. PANI polarized the anodic reaction and Ce 3+ inhibited the cathodic reaction.
研究领域:
材料科学
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腐蚀工程
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聚合物化学
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产品关联
DOI
高影响因子
OPTICAL MATERIALS
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2025
·
IF 4.2
Rouziaji Alimu,Reziwanguli Yantake,He Jiuyang,Wang Qingling,Aierken Sidike
To achieve high-color-rendering WLED devices, exploration of blue‒cyan phosphors that can be excited by near-ultraviolet (NUV) chips is particularly important to compensate for the cyan gap. In this work, feldspar-structured Sr 1-y Al 2- x Ga x Si 2 O 8 :yCe 3+ blue-cyan phosphors were prepared via a high-temperature solid-phase method and a cation substitution strategy. The luminescence performance of the Sr 0.96 Al 2 Si 2 O 8 :0.04Ce 3+ sample was improved by applying the cation substitution strategy of partially replacing Al 3+ with Ga 3+ , and the representative sample Sr 0.96 Al 1.4 Ga 0.6 Si 2 O 8 :0.04Ce 3+ was obtained. The luminescence intensity increased threefold for the Sr 0.96 Al 1.4 Ga 0.6 Si 2 O 8 :0.04Ce 3+ compound compared to Sr 0.96 Al 2 Si 2 O 8 :0.04Ce 3+ , and a broadband blue‒cyan phosphor with a half-height width of 100 nm was obtained. The representative sample Sr 0.96 Al 1.4 Ga 0.6 Si 2 O 8 :0.04Ce 3+ showed relatively good thermal stability. Sr 0.96 Al 1.4 Ga 0.6 Si 2 O 8 :0.04Ce 3+ was combined with 365 nm NUV LED chips and commercial (Sr, Ca)AlSiN 3 :Eu 2+ to obtain WLED devices with color rendering index (Ra) as high as 94.8 and correlated color temperatures (CCTs) as high as 4831.4 K. These results show that the blue-cyan phosphor complements the cyan component while simplifying the manufacturing process of WLEDs.
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 THE AMERICAN CERAMIC SOCIETY
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2024
·
IF 3.5
Jiawen Li,Feifei Huang,Youjie Hua,Bingpeng Li,Shiqing Xu,Ruoshan Lei
In an effort to obtain a novel cyan-emitting phosphor, the [K 1-x Rb x ] 3 GdSi 2 O 7 : yCe 3+ materials (x = 0, 0.1, 0.2, 0.3, 0.4, y = 0, 0.005, 0.01, 0.02, 0.03, 0.04) are synthesized via a solid-state reaction pathway, and their crystal structure and luminescence behaviors are studied systematically. The chemical substitution of Rb + in the K + sites can enlarge the K 3 GdSi 2 O 7 host lattice and help to the blue-shifting of emission band of Ce 3+ ions due to the decreased crystal field splitting effect. It is also confirmed that the Ce 3+ ions tend to enter [Gd1O 6 ] and [Gd 2 O 6 ] polyhedrons simultaneously. Consequently, the [K 0.7 Rb 0.3 ] 3 GdSi 2 O 7 : Ce 3+ phosphor yields a broadband cyan emission centered at 492 nm with the full width at half maximum (FWHM) of ∼115 nm upon 365 nm excitation. The optimal concentration of Ce 3+ dopant is determined to be 0.01, and the concentration quenching effect can be attributed to the dipole−dipole interactions. The white light emitting diode (WLED) device fabricated by employing the discovered [K 0.7 Rb 0.3 ] 3 GdSi 2 O 7 : 0.01Ce 3+ phosphor displays a high color rendering index (R a = 91.7) and a low correlated color temperature (CCT = 3749 K). This work may promote the development of cyan phosphors for near ultraviolet-converted WLEDs with high performance.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Qiang Liu,Jingdong Xu,Peixiong Zhang,Anming Li,Zhen Li,Hao Yin,Encai Ji,Zhenqiang Chen
A Sm 3+ /Ce 3+ co-doped Gd 0.1 Y 0.9 AlO 3 laser crystal was successfully grown and analyzed. The use of Ce 3+ co-doping for enhancing the Sm 3+ : 4 G 5/2 → 6 H 7/2 yellow emission was investigated in the Gd 0.1 Y 0.9 AlO 3 crystal for the first time. In comparison to Sm 3+ single-doped Gd 0.1 Y 0.9 AlO 3 crystal, the Sm 3+ /Ce 3+ co-doped Gd 0.1 Y 0.9 AlO 3 crystal had a higher luminescence branching ratio (48.9%) and luminescence emission cross section (5.01×10 −20 cm 2 ) corresponding to the laser transition 4 G 5/2 → 6 H 7/2 of Sm 3+ . It was found that the introduced Ce 3+ greatly enhanced the 602 nm emission by increasing the population of the laser excited level Sm 3+ : 4 G 5/2 . These results suggest that Sm 3+ /Ce 3+ co-doped Gd 0.1 Y 0.9 AlO 3 crystal may be an attractive host for developing solid state lasers at around 602 nm laser applications.
研究领域:
光学材料
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激光物理
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固体激光器
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稀土掺杂
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光子学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2025
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IF 4.7
Wei Lv,Yan Gao,Qingguang Zeng,Xinxin Han,Tao Hu
The discovery of efficient green phosphor is of great interest in wide range of applications in lighting, display, scintillator, and temperature sensing. Herein, an innovated Ce 3+ -substituted green-emitting gallate phosphor is presented. The green emission in CaYGaO 4 :Ce 3+ originates from Ce 3+ occupying at octahedrally coordinated Y 3+ site rather than Ca 2+ site. This preferential substitution is identified by DFT-based formation energy calculations and supported by Rietveld refinement and photoluminescence spectra. The Ce 3+ ion experiences a strong crystal field splitting on the 5d states, and ultimately shifts the emission into green spectra region with dual emission band at 508 and 588 nm (λ ex = 460 nm). The phosphor exhibits excellent thermal quenching property, as its integrated photoluminescence intensity at 150 °C and 250 °C can retain 72.33 % and 54.11 % of that at room temperature, respectively, resulting from the reduced nonradiative losses. A prototype WLED fabricated by coating the green emitting CaYGaO 4 :Ce 3+ phosphor and red emitting CaAlSiN 3 :Eu 2+ phosphor onto a blue LED chip yields a warm light with uniform light distribution. And also, by utilizing the fluorescent intensity ratio of the two emission bands as a temperate index, the promising application of the phosphor for remote temperature sensing is also demonstrated.
研究领域:
材料科学
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光学
·
温度传感技术
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）