JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Jianxu Wang,Jiang Guo,Qiuyi Lv,Zhijiang Ma,Xuyao Feng,Yuhiu Lu,Jing Gao,Wensheng Chen,Bin Deng,Ruijin Yu
A series of novel orange-red emitting tungstate phosphors, Ca 3 La 2 W 2 O 12 (CLWO): x Sm 3+ (0.005 ≤ x ≤ 0.30) were successfully prepared through the solid-state method at high temperature. The space group is hexagonal R 3 ‾ m . Under 600 nm monitoring, a large charge transfer band from 250 to 340 nm composed of the electron transition of O 2- –Sm 3+ and O 2- –W 6+ and represented the strongest excitation at 300 nm. CLWO:Sm 3+ emitted orange-red light at 600 nm ( 4 G 5/2 – 6 H 7/2 ) under the strongest excitation of 300 nm. The intensity ratio of the electric-dipole and magnetic-dipole of all the samples were bigger than 1. With the Sm 3+ -doped concentration increasing, the upward tendency of ratio values originated from the increased degree of lattice distortion . The calculated R c (21.32 Å) and Q (3.78) represented the dipole–dipole interaction to account for the concentration quenching. With the temperature changing from 300 to 400 K, the chromaticity coordinates of samples just have a tiny difference (Δ x = 1.02 × 10 −4 , Δ y = 1.01 × 10 −4 ). The thermal activation energy was calculated to be 0.42 eV and T 0.5 > 480 K. The color purity of all the phosphors reached 98.9%. Ultimately, a white light-emitting diode (w-LED) was fabricated by coating trichromatic (red, blue, and green) phosphors on a near-ultraviolet chip. The fabricated w-LED revealed a high color rendering index (R a = 91, R 9 = 41) and a good chromaticity coordinate (0.320, 0.363) in the white area. Thus, these orange-red phosphors CLWO:Sm 3+ with high thermal stability and high color purity can be potentially used in w-LED applications.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Zongliang Xiao,Weizhen Liu,Gan Wan,Jianlei Liu,Lu Yu,Qian Zhang,Lei Han
The quest for advanced full-spectrum lighting technologies has driven the development of W-LEDs, while challenges remain in finding effective cyan emitters and ensuring outstanding thermostability. This study detailed the synthesis of the europium-doped CaO-Al 2 O 3 -SiO 2 -YF 3 glass-ceramics (GCs), which demonstrated efficient cyan emission when irradiated by 419 nm light, with a spectacular internal quantum efficiency of up to 83.24 %, and outstanding thermal stability of 90.2 %@100℃ compared to room temperature intensity. In practical applications, this GC was integrated with a 420 nm LED chip, (Sr, Ca)AlSiN 3 : Eu 2+ red and Y 3 Al 5 O 12 : Ce 3+ yellow phosphor in a prototype full-spectrum W-LED device. The device achieved an excellent color rendering index (94), appropriate chromaticity coordinates (0.3789, 0.3950), and a well-defined correlated color temperature (4163 K). This study not only advances the application of GCs within W-LED technology but also reveals their potential in driving energy-saving and eco-friendly lighting solutions, thus providing a path to achieve superior full-spectrum lighting technology.
研究领域:
材料科学
·
光学工程
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2026
·
IF 5.8
Qing Yao,Chen Zhang,Junnan Wang,Wangchao Wan,Minqiang Wang
Carbon dots (CDs) with room-temperature phosphorescence (RTP) properties have been widely applied in various fields. However, achieving multicolor phosphorescence with high stability remains a significant challenge. In this study, a simple synthetic strategy was developed to prepare RTP CDs composites (CDs@SiO2–Urea) by using trimesic acid (TMA) as the carbon source, with urea and (3-aminopropyl)triethoxysilane (APTES) serving as a coconstructed rigid matrix. CDs@SiO2–Urea exhibits bright blue RTP after UV light is turned off, with a lifetime of 406 ms and visible to the naked eye for 6 s. Notably, owing to the synergistic protective effect of the urea and APTES matrices, CDs@SiO2–Urea demonstrates high stability in water, organic solvents, and strong acidic and alkaline environments while still maintaining excellent RTP properties. Additionally, based on the Förster resonance energy transfer (FRET) mechanism, brilliant green (BG), rhodamine 6G (Rh6G), and rhodamine B (RhB) were introduced to the CDs@SiO2–Urea system, successfully achieving green, yellow, and red multicolor fluorescence and phosphorescence emission. Finally, utilizing the unique optical properties of the prepared samples, the materials were successfully applied to anticounterfeiting encryption and white light-emitting diode (W-LED) devices. These devices maintain high luminance intensity and a stable color rendering index (CRI) during long-time operation, highlighting the strong potential of RTP CD composites for commercial applications.
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 103
·期 1
·382-390
·
IF 3.094
Linli Shen,Zelong Zhang,Yi Zhao,Haisheng Yang,Lin Yuan,Ya Chen,Weidong Xiang,Xiaojuan Liang
In this report, a mixed-metal cation-based halide perovskite (HP) CsPb 1− x Ti x Br 3 quantum dots (QDs) were first embedded in the B–Si–Zn glasses using a traditional approach of melt quenching and heat treating. A battery of test results such as photoluminescence, X-ray diffraction, and time-resolved attenuation prove that Ti ions do not destroy the properties of CsPbBr 3 , and they are successfully doped into CsPbBr 3 . At the same time, the doping of Ti ions also reduces the toxicity of lead. By altering the ratio of Pb/Ti, we determined the optimum ratio of CsPb 0.7 Ti 0.3 Br 3 QDs through experimental data. Due to the excellent optical properties and stability of CsPb 0.7 Ti 0.3 Br 3 QDs glass, it was designed to construct the white-light emitting diode device with tunable color coordinate, color rendering index, correlated color temperature, and a high luminous efficiency compared with CsPbBr 3 QDs glass, which may be a promising candidate for the field of lighting and displays.
研究领域:
材料科学
·
光学工程
·
电子器件
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DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2025
·
IF 3.4
Chonghui Niu,Mingjie Dan,Yi Yu,Xiurong Zhu,Yixin Fu,Yeqing Wang,Wang Zhao,Kenneth R. Poeppelmeier
In this study, a series of novel Eu3+-activated NaLu(MoO4)2 (NLMO) red phosphors were synthesized for the first time using hydrothermal, sol–gel, and microemulsion methods with varying active agents. The properties of these phosphors, including phase purity, crystal structure, DFT calculations, morphology, luminescence characteristics, thermal stability, and internal quantum efficiency, were comprehensively characterized. The results indicate that the ethylenediaminetetraacetic acid disodium salt (EDTA-2Na)-assisted hydrothermal method is the most suitable approach for the preparation of the phosphor. This method yields phosphors with a regular morphology, outstanding luminescence performance, relatively good thermal stability, and significantly high internal quantum efficiency. The internal quantum efficiency reaches 96.45%, and the phosphor exhibits good thermal stability, with the emission intensity at 423 K remaining about 73% compared to the initial temperature. The CIE chromaticity coordinate of the NLMO/0.13Eu3+ sample (0.667, 0.333) is very close to the standard chromaticity coordinate value (0.670, 0.330) from the National Television Standards Committee (NTSC). Remarkably, the color purity of the NLMO:0.13Eu3+ phosphor is an impressive 97%. Furthermore, Tb3+ was cointroduced in the NLMO:0.13Eu3+ phosphor, and its positive effects are discussed. Ultimately, a warm white light-emitting diode (W-LED) was fabricated using the studied NLMO:0.13Eu3+ phosphor with a 394 nm near-ultraviolet-emitting LED chip as the excitation source. The W-LED exhibits excellent properties such as high color purity, excellent correlation color temperature, and high color rendering index. Considering all of the results, the NLMO/Eu3+ red phosphor obtained by the EDTA-2Na-assisted hydrothermal method is an ideal red component for W-LEDs in various lighting applications.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·Vol. 51
·期 5
·6133-6144
·
IF 5.1
Gan Wan,Lei Han,Zongliang Xiao
In the realm of advanced luminescent materials , glass-ceramic (GC) incorporated into rare earth (RE) represents a promising candidate. However, their practical application has been constrained by limitations in luminescence efficiency and thermal stability. This study overcomes these challenges by introducing a novel Eu 3+ -doped black talc GC with enhanced optical characteristics . Our method involved fabricating a new glass matrix and incorporating heavy concentrations of Eu 3+ ions. Following a precise nucleation-crystallization process, CaMgSi 2 O 6 nanoscale crystals were uniformly dispersed within the GCs matrix, markedly enhancing its luminescent properties. When excited by 394 nm light, this GC achieved a notable internal quantum efficiency (IQE) of 88.97 %, surpassing many traditional Eu 3+ -doped glasses and GCs. Furthermore, it retained 89.6 % of its luminescence intensity even at 100 °C, indicating remarkable thermostability. To validate the GC's practical utility, we integrated this material into a white light-emitting diode (W-LED) component, incorporating a LED chip, CaMgSi 2 O 6 : Eu 3+ GC, BaMgAl 10 O 17 : Eu 2+ , and Ba 2 SiO 4 : Eu 2+ phosphor. The fabricated device demonstrated excellent chromaticity coordinates of (0.3493, 0.3935), a correlated color temperature (CCT) of 4976K, and a prominent color rendering index (CRI) of 90.3. This research not only expands the potential applications of black talc, but the prepared GCs also exhibit excellent performance in luminescence properties, highlighting the broad application of this Eu 3+ -doped GCs in W-LED lighting technology.
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高影响因子
Advanced Optical Materials
·
2019
·Vol. 7
·期 12
·1900093
·
IF 7.125
Sisi Liang,Guogang Li,Peipei Dang,Yi Wei,Hongzhou Lian,Jun Lin
Currently, Mn 4+ -activated red-emitting materials are the research hotspot due to their promising application in phosphor-converted white light-emitting diodes (w-LEDs). Here, a typical cation substitution strategy is reported to optimize Mn 4+ -doped germinate phosphor for improving luminescence performances. The effect of cation substitution for Ge 4+ ions by Ti 4+ , Sn 4+ , and Si 4+ ions on lattice structure, photoluminescence properties, and thermal stability of the as-prepared Mn 4+ -doped germinates is systematically investigated. A significant improvement of emission intensity with Ti 4+ doping should benefit from the resonance emission enhancement effect. Some lattice distortion defects contribute to the thermal stability enhancement, which plays a role in driving the excited phonon traps to compensate the energy loss of nonradiative transition. Surprisingly, abnormal variation in intensity of anti-Stokes and Stokes emission peaks with changing temperature is first observed, revealing a potential application in thermometry. The electroluminescence performances of as-fabricated w-LED devices using Mg 14 Ge 5 Ti 0.5 O 24 :Mn 4+ red phosphor are evaluated, which possess higher color rendering index ( R a = 87.3) and luminous efficiency (109.42 lm W −1 ) as well as lower color correlated temperature (3566 K) than those using Cs 2 GeF 6 :Mn 4+ and CaAlSiN 3 :Eu 2+ red phosphors. The results reflect the superiority of the studied phosphor in w-LEDs and optical thermometry areas.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Shiyu Xu,Junjie Fu,Xuening Liu,Meiyu Yuan,Chaoqun Zhang,Haibo Wang,Guangxi Liu,Sheng Cui
A family of highly thermal chromatic stable Dy 3+ -Eu 3+ doped B 2 O 3 -Bi 2 O 3 -ZnO-Li 2 O (BBZL) glass samples was synthesised using the high-temperature melt quenching technique. The optical and thermal stability properties of the samples were analysed using their fluorescence spectra at various temperatures, fluorescence lifetime decay times and colour coordinates. The Dy 3+ -doped BBZL (BBZL: Dy) glass samples generated cold white light when exposed to ultraviolet (UV) light, while the Dy 3+ -Eu 3+ -doped BBZL (BBZL: DyEu) glass samples emitted neutral and warm white light, which can be attributed to the introduction of Eu 3+ that substantially enhanced the colour rendering of samples. An overlap of the excitation-emission spectra of Eu 3+ and Dy 3+ indicated an energy transfer between Dy 3+ and Eu 3+ . Under a 350 nm excitation, the fluorescence lifetime of BBZL: DyEu decreased from 0.5348 to 0.3642 ms. Using the Dexter theory, the energy transfer between Dy 3+ and Eu 3+ was demonstrated to be an electric dipole-electric dipole leap. The chromaticity shifts of BBZL: DyEu were 8.60 × 10 −4 and 9.40 × 10 −4 at 448 and 498 K, respectively, reflecting the high thermal stability of the sample chromaticity. The study demonstrated that Dy 3+ -Eu 3+ doped borate glasses can be used as tunable luminescent materials in high-power white light-emitting diodes to mitigate the chromaticity shift in fluorescent materials at high temperatures.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Jun Sun,Wei Zhu,Bei Zhang,Feifei Huang,Limin Hu,Hongping Ma,Renguang Ye,Youjie Hua,Shiqing Xu
Full-spectrum white LED (w-LED) lighting is primarily achieved through the combination of multiple-color phosphors excited by the chip, and making the development of efficient multi-color phosphors based on single matrix is an excellent choice for full-spectrum w-LED. In this paper, a series of Rb 2 KNa(Li 3 SiO 4 ) 4 : xEu 2+ (0.1 % ≤ x ≤ 15 %) phosphors were successfully synthesized via high-temperature solid-state reaction with varied Eu 2+ concentration. At low doping concentration, the Eu 2+ ions exhibit primarily green emission at 530 nm in the phosphor. However, as the doping concentration of Eu 2+ ions increase, the emission spectrum undergoes a significant transformation. A cyan emission occurs at 478 nm, resulting in the spectral conversion from a green single-peak emission to a dual-peak emission of cyan and green. The spectral conversion is attributed to the changes in the positioning of Eu 2+ ions within the crystal lattice . The obtained phosphors demonstrate excellent thermal stability and can be utilized in w-LED devices. After encapsulation with a blue LED chip, it achieves a color rendering index of 91.8 and a correlated color temperature of 4085 K, showcasing its significant application value in the field of full-spectrum w-LED.
研究领域:
材料科学
·
光电子学
·
固态化学
·
荧光粉技术
·
照明工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Jianxu Wang,Yan Xie,Junlan Guo,Xuemei Yao,Xue Geng,Jing Gao,Xuyao Feng,Zijing Zhou,Yuanyuan Liu,Bin Deng,Ruijin Yu
Novel apatite-type NaCa 3 Bi(PO 4 ) 3 F: x Sm 3+ (0.01 ≤ x ≤ 0.30) orange-red-light phosphors were synthesized through the solid-state method at high temperature. The crystal structure, energy band structure , density of state, phase purity, particle morphology , photoluminescence properties, thermostability, and luminescence decay of the phosphors were comprehensively characterized. When λ ex = 404 nm, the optimal NaCa 3 Bi(PO 4 ) 3 F:0.05 S m 3+ phosphor showed the orange-red emission (597 nm). The NaCa 3 Bi(PO 4 ) 3 F:Sm 3+ phosphors exhibited abnormal thermal quenching properties as their emission intensity increased by about 2.57% from 300 to 380 K. Their intensity at 440 K was still 1.01-fold stronger than that at room temperature. The abnormal thermal quenching mechanisms were well explained via the coordinate configuration scheme. The thermal activation energy ( E a ) was calculated to be 0.79 eV. The color purity of all the phosphors reached 99.9%. Ultimately, a white light-emitting diode (w-LED) was fabricated based on the tri-color RGB method. The color rendering index and the chromaticity coordinates of the fabricated w-LED were 89 and (0.310, 0.319), respectively. Thus, these high thermostability NaCa 3 Bi(PO 4 ) 3 F:Sm 3+ orange-red phosphors can be potentially used in w-LED applications.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2022
·Vol. 10
·期 10
·2102200
·
IF 10.05
Chong Zhao,Yingkui Li,Wanggui Ye,Xiaofei Shen,Zicheng Wen,Xuanyi Yuan,Yongge Cao,Chaoyang Ma
Colloidal all-inorganic lead halide perovskite nanocrystals (LHP NCs) feature with tunable high-efficiency photoluminescence from blue to red for optoelectronic applications but suffer from instability under water moisture, UV light illumination, high-temperature shock, as well as oxygen erosion. Previous work to improve LHP NCs stability was mainly focused on either glass bulk sealed LHP quantum dots (QDs) with low quantum efficiency, or mesoporous silica matrixes confined LHP QDs with organic ligands still existing. Here, a facile, noncolloidal, ligand-free LHP QDs growth with physical confinement is proposed by integrating the growth of perovskite QDs with the fabrication process of hydrophobic silica-aerogel powders (SAPs). As a result, the as-synthesized mono- and mixed-cesium-lead-halide QDs @ SAPs composites show tunable photoluminescence from purple to deep red. Besides, the Pr 3+ ions doped CsPbBr 3 QDs @ SAPs composites exhibit moderate quantum efficiency, excellent stability under UV illumination, water moisture as well as temperature variation. Furthermore, performances of white LED device encapsulated Pr 3+ doped composite with blue GaN chip and commercial red (Sr, Ca)AlSiN 3 :Eu 2+ phosphor are evaluated. This work demonstrates a facile and general strategy for synthesizing high-stable all-inorganic cesium-lead-halide QDs for applications in white LED and display devices.
研究领域:
材料科学
·
光电技术
·
纳米技术
·
光子学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Lin Liu,Shanshan Peng,Lei Fu,Yuxuan Guo,Xia Sun,Liang Song,Junpeng Shi,Yun Zhang
Since the strong blue light from the conventional blue chip has negative effects on human health, near-ultraviolet (n-UV) white light-emitting diodes (W-LEDs) have been widely studied. However, the photoluminescence spectrum generated by tricolor (blue, green, and red) phosphors contains a notable cavity in the deep-blue region (400–430 nm), which reduces the color quality. In this work, we report a novel series of narrow-band deep-blue-emitting phosphors with strong n-UV excitation, Ln2Si2O7:Bi3+ (Ln = Gd, Y, Lu, Sc), and realize the tuning of emission from 422 to 403 nm via cationic substitution, which bridges the deep-blue gap. All of these phosphors are effectively excited by n-UV radiation at approximately 370 nm and exhibit narrow-band deep-blue emission with a full width at half-maximum (FWHM) < 50 nm. Among them, Sc2Si2O7:Bi3+ generates 403 nm deep-blue emission with a 38 nm FWHM under 372 nm n-UV excitation, with high luminescence intensity and excellent thermal stability. Finally, 365 nm n-UV-pumped phosphor-converted (pc) W-LED devices are fabricated by combining Sc2Si2O7:Bi3+ and commercially available phosphors, and they have a high color-rendering index (Ra) of 95.4 and a low correlated color temperature (CCT) of 3736 K. This result suggests that these phosphors have potential applications in full-spectrum warm white lighting.
研究领域:
材料科学
·
光学工程
·
照明技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）