OPTICAL MATERIALS
·
2023
·
IF 3.9
Mingxiao Han,Yanling Chen,Jie Fu,Jianhua Lin,Yinuo Wen,Shuyang Chen,Jie Li,Degang Deng
Bi 3+ , Sm 3+ co-doped Ca 2 YSbO 6 phosphors with dual-emitting centers were created using a high-temperature synthetic process. Investigations were conducted into the phase structure, luminous characteristics, and optical temperature dependent properties. Under the condition of 320 nm Ultraviolet light excitation, the Ca 2 YSbO 6 : Bi 3+ phosphor exhibits the 3 P 1 → 1 S 0 emission of Bi 3+ , which peaked at 402 nm, and the Ca 2 YSbO 6 : Sm 3+ phosphor exhibits the 4 G 5/2 → 6 H n/2 (n = 5, 7, 9 and 11) red emission of Sm 3+ , which is visible between 550 and 720 nm. Spectrum overlap between the PL spectrum of Bi 3+ and the PLE spectrum of Sm 3+ served as evidence for the energy transfer (ET) behavior. Furthermore, the conclusion could be supported by the life decay of Bi 3+ .In the case of optimal UV excitation of 320 nm, the maximum absolute sensitivity (S a ) and relative sensitivity (S r ) values for Ca 2 YSbO 6 : Bi 3+ , Sm 3+ were 2.21 × 10 −3 K −1 and 0.973% K −1 , respectively, at 503 K. The outcomes demonstrated that the Ca 2 YSbO 6 : Bi 3+ , Sm 3+ phosphor could perform well as an optical thermometer.
研究领域:
材料科学
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光学材料
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发光光谱学
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固体物理
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传感器与仪器
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DOI
高影响因子
PHOTOCHEMISTRY AND PHOTOBIOLOGY
·
2014
·Vol. 90
·期 6
·1462-1466
·
IF 2.684
Ying Mei,Bing Yan
A special multifunctional ionic liquid compound (1-methyl-3-(2-(thiocarboxyoxy)-ethyl)-2H-imidazole-1,3-diium bromide (SHIL)) is used as the chemical bridge to link lanthanide beta-diketonates and polymer resin, which are designated as Ln(L) 4 -SHIL-WR/MR (Ln = Eu, Tb, Sm; L = thenoyltrifluoroacetonate (TTA), acetylacetonate (AA), dibenzoylmethane (DBM); WR = Wang resin, MR = Merrifield resin). Among SHIL and polymer resin are assembled to form covalently bonded system through condensation reaction. Then tetrakis lanthanide beta-diketonates are linked to SHIL through ion-exchange reaction. Physical characterization and especially the photoluminescent performance of the multicomponent hybrids are studied. The hybrid materials possess good stability and excellent luminescent property. The results provide useful path to obtain luminescent hybrids for further practical application.
研究领域:
材料科学
·
化学
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DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 15
·4808-4818
·
IF 4
Xiujuan Zhao,Yanmin Wang,Zhidong Pan,Youjun Lu,Junhao Li,Mingmei Wu
A Sm3+-doped YGa1.5Al1.5(BO3)4 (abbreviated as YGAB) phosphor was synthesized via a solid-state reaction with mechanical activation assistance in a high-energy density stirred bead mill. The samples were characterized by laser particle size analysis, specific surface area analysis, powder X-ray diffraction (XRD), scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and fluorescence spectroscopy. In addition, the photoluminescence characteristics, luminescence decay, thermal stability, and LED application of the phosphors were also investigated. The results show that the mechanical activation of mixed raw materials before calcination can reduce the particle size and the activation energy of crystallization, resulting in the formation of the YGAB crystal phase at a lower calcination temperature. The mechanical activation in grinding can accelerate the subsequent solid-phase reaction, make Sm3+ ions more easily diffuse into the YGAB lattice, and improve the crystal structure of the synthesized phosphor, thus enhancing the optical properties of the phosphor. According to the photoluminescence emission (PL) and excitation (PLE) spectra, Sm3+ doped in the YGAB lattice can provide an efficient emission under 405 nm excitation. The optimum doping concentration of Sm3+ ions is 0.03 mol%. The optimum photoluminescence intensity, quantum yield, and fluorescence lifetime of the phosphor synthesized from mixed raw materials ground for 45 min can be obtained. The temperature-dependent PL spectra show that the emission intensity of the YGAB:0.03Sm3+ phosphor at 425 K is 84.7% of its initial intensity at room temperature. It is indicated that the YGAB:0.03Sm3+ phosphor synthesized could be used as one of the promising LED lighting materials.
研究领域:
材料科学
·
光学
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产品关联
DOI
PubMed
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
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光子学
·
固态化学
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光电子器件
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发光材料
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产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2015
·
IF 4.772
Lili Wang,Hyeon Mi Noh,Byung Kee Moon,Sung Heum Park,Kwang Ho Kim,Jinsheng Shi,Jung Hyun Jeong
Dual-mode excitation properties were introduced in Sm3+ doped Sr2CaMoO6 prepared by a high temperature solid state reaction technique. Two ways are available to generate white light in the single-component phosphor activated by Sm3+ ions. Warm white light can be obtained from Sr1.995Sm0.005CaMoO6 phosphor pumped by 380 or 411 nm excitation energy. The full visible spectral emission of the single-phase phosphor comes from the high and low level emission lines of Sm3+ ions as well as the intrinsic luminescence of MoO6 group. It is also competitive as yellow-emitting phosphor for blue pumped white LEDs and gives three emission bands at 567, 603, and 650 nm, presenting yellow luminescence upon 466 nm radiation. The 650 nm red emission band corresponding to 4G5/2 → 6H9/2 transition of Sm3+ can make its color rendering index better. The excellent photoluminescence of Sr2CaMoO6 is related to the partial tilting CaO6 octahedral and the lowered symmetry were confirmed by General Structure Analysis System. Band gap of Sr2CaMoO6 estimated from the diffuse reflection spectra and also calculated by CASTEP mode shows its semiconducting character. All the results show that the Sr2–xSmxCaMoO6 phosphors have considerable potential for applications in near UV LED or pumped by blue LED chip.
研究领域:
材料科学
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光学材料
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光子学
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固态化学
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发光材料
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LED技术
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DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2026
·
IF 4.8
Kang Wang,Chenjun Pan,Zhanghai Tian,Can Yuan,Yu Li,Huangyao Chen,Ruirui Cui,Xiang Guo
A novel class of orange-red emitting Lu 2 SrAl 4 SiO 12 : x Sm 3+ phosphors was synthesized via a high-temperature solid-state reaction. Rietveld refinement confirmed that Sm3+ dopants successfully substitute Lu 3+ sites within the cubic garnet matrix. Under 405 nm near-ultraviolet excitation, the phosphors exhibit intense orange-red emissions, with the dominant peak at 618 nm originating from the 4 G 5/2 → 6 H 7/2 transition. Investigations reveal that the maximum luminescence output is achieved at a doping level of x = 0.03. Beyond this point, the concentration quenching process is dominated by dipole-dipole interactions, with the critical energy transfer distance calculated to be 18.88 Å. The optimized phosphor ( x = 0.03) exhibits an internal quantum efficiency of 16.7% and a fluorescence lifetime of 2.16 ms. It demonstrates robust thermal stability, retaining 68% of its initial intensity at 423 K. The activation energy governing this thermal quenching process is determined to be 0.187 eV. All single-doped samples exhibit ultra-high color purity exceeding 98.4%. By blending the Lu 2 SrAl 4 SiO 12 :0.03Sm 3+ phosphor with commercial blue/green phosphors on a 405 nm n-UV chip, a high-performance white light-emitting diodes device were fabricated, achieving a warm correlated color temperature of 4318 K and a high color rendering index of 84.53. Furthermore, its successful application as security inks across diverse substrates confirms Lu 2 SrAl 4 SiO 12 :0.03Sm 3+ as a highly promising dual-functional material for advanced solid-state lighting and optical anti-counterfeiting.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Wasim Ullah Khan,Lei Zhou,Xiaohui Li,Weijie Zhou,Dilfaraz Khan,Shah-Iram Niaz,Mingmei Wu
The white light-emitting diodes, contributing as a light initiator for the succeeding generation, is now becoming a consistently developing and attractive research area. However, the weak thermal stability, high correlated color temperature (CCT), and low color rendering (Ra) restrict its effectiveness for large-scale implementation. In this work, we reported for the first time the incorporation of rare-earth ions Ce 3+ -Tb 3+ -Sm 3+ into Ca 3 YAl 3 B 4 O 15 (CYAB) in the fabrication of WLEDs, which showed tunable photoluminescence properties to accomplish exceptional thermal stability, single-phase white light emission, and efficient energy transfer among Ce 3+ , Tb 3+ , Sm 3+ ions, respectively. The crystal structure and the rare earth ion dopants in the cation borate CYAB phosphors were quantitatively evaluated, that highlighting the preferences at 9-fold-coordinated Y sites. The sensitization effects were studied by evaluating the photoluminescence, lifetime curves, and quantum efficiencies, respectively. Besides this, the CY 0.45 AB:0.50Tb 3+ ,0.05Sm 3+ and CY 0.65 AB:0.03Ce 3+ ,0.20Tb 3+ ,0.12Sm 3+ phosphors possess significant resistance towards thermal quenching phenomena. The white LED either containing CY 0.45 AB:0.50Tb 3+ ,0.05Sm 3+ phosphor blended with the commercial blue phosphor or the single-phase WLED only containing CY 0.65 AB:0.03Ce 3+ ,0.20Tb 3+ ,0.12Sm 3+ phosphor exhibited warm white emissions either with low CCT ≈ 4543 K or 3913 K and high Ra with 86.0 or 84.4, respectively. These results are superior to the commercial WLED containing Y 3 Al 5 O 12 :Ce 3+ phosphor and blue LED chip (CCT ≈ 7746 K, Ra ≈ 75), that furnish either as a good candidate for the fabrication of warm WLED.
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
OPTICAL MATERIALS
·
2024
·
IF 3.8
Changwen Wang,Lixin Peng,Feng Qin,Meng Kou,Yongda Wang,Lingling Xu,Zhiguo Zhang
The understanding of how radiative transition probabilities change with temperature is crucial for comprehending the relationship between fluorescence behavior and temperature. However, although various models have been proposed to explain the patterns of transition probabilities ( A ) with temperature changes, they lack consistency due to their derivation from distinct microscopic perspectives. In this study, the macroscopic law of the temperature-dependent A for the 4 G 5/2 , 4 F 9/2 , and 5 D 0 energy states in YVO 4 :Re 3+ (Re 3+ =Sm 3+ , Dy 3+ and Eu 3+ ) was obtained. Three rare earth ions (Re 3+ ) were identified for each with unique energy level properties conducive to validating the general rules of A . These ions share a common characteristic: in the visible spectrum , their main emissions originate from the radiative transitions from the same higher energy level ( 4 G 5/2 in Sm 3+ , 4 F 9/2 in Dy 3+ , and 5 D 0 in Eu 3+ ) to lower energy levels, respectively. The A of the main emission levels, varying with T , were obtained by fitting the fluorescence decay curves. The exponential law governing non-radiative transitions was revealed after separating the radiative transition rate ( W R ) from A . The macroscopic law of temperature-dependent transition probabilities of 4 G 5/2 , 4 F 9/2 , and 5 D 0 energy states in YVO 4 :Ln 3+ (Ln 3+ = Sm 3+ , Dy 3+ and Eu 3+ ) has been found to follow the Boltzmann distribution . The results indicate that the non-radiative transitions of the main emission levels of the rare-earth ions are processes from the excited state to adjacent lower energy levels. This macroscopic pattern may serve as a foundational rule for understanding the impact of microscopic factors on A .
研究领域:
光学
·
材料科学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 36
·1-14
·
IF 2.8
Yang Jian,Xie Chenglong,Zhao Lei
A newly synthesized orange–red-emitting phosphor, K 2 Sr(MoO 4 ) 2 :Sm 3+ , was produced for the first time through high-temperature solid-state synthesis methods. Detailed analysis was conducted on the phase purity, morphology, and luminescence properties of the synthesized phosphors. The K 2 Sr(MoO 4 ) 2 :Sm 3+ phosphors let forth orange–red light when excited at 403 nm because of the 4 G 5/2 → 6 H 9/2 transition. The optimal doping concentration of the K 2 Sr(MoO 4 ) 2 : x Sm 3+ phosphor was found to be x = 3 mol%. The chromaticity coordinates of K 2 Sr(MoO 4 ) 2 :3 mol% Sm 3+ were (0.617, 0.381) with a corresponding high color purity of 99.8%. This prepared w-LED exhibited an exceptional color rendering index (CRI) of 90, while maintaining a suitable correlated color temperature (CCT) of 5825 K and CIE color coordinates were (0.325, 0.327). Hence, K 2 Sr(MoO 4 ) 2 :Sm 3+ phosphors are desirable options for creating w-LEDs and lighting based on near-ultraviolet (NUV) chips. Their unique properties show significant potential for enhancing the performance of solid-state lighting.
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
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
CRYSTAL GROWTH & DESIGN
·
2026
·
IF 3.6
Yujie Wei,Ying Lv
Single-phase white phosphors are highly desirable for achieving stable white light-emitting diodes (w-LEDs). In this work, a series of Ce3+-, Tb3+-, and Sm3+-doped as well as codoped Ca3LuAl3B4O15 (CLAB) phosphors were successfully synthesized, and white light was achieved by tuning relative doping concentrations. The phase structure, morphology, and optical properties were systematically investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), and photoluminescence spectroscopy. Energy transfer from the parity-allowed Ce3+ ions to the parity-forbidden Tb3+ and Sm3+ ions was confirmed through spectral analysis and comparison. Under 342 nm excitation, the optimized CLAB:1%Ce3+,2.5%Sm3+,10%Tb3+ phosphor exhibits warm-white-light emission originating from three activators. In addition, the phosphor retains 71% and 42% of its initial emission intensity at 450 and 600 K, respectively, demonstrating the good thermal stability of the phosphor. By combining the optimized CLAB:1%Ce3+,2.5%Sm3+,10%Tb3+ phosphor with a commercial 340 nm ultraviolet (UV) chip, a warm w-LED was fabricated, exhibiting CIE chromaticity coordinates of (0.3631, 0.3625), a correlated color temperature (CCT) of 4419 K, and a color rendering index (CRI) of 93. This study offers a newly designed single-phase white phosphor for high-quality warm w-LEDs.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Xuezhong Yang,Hang Liu,Hongqun Zhu,Chunhui Sun,Haozhou Tian,Qiang Wang,Yuhong Zhang
Here, a new type of Sb 3+ /Sm 3+ ions heavy concentration doped Cs 2 NaBiCl 6 double perovskites was successfully synthesized by solvothermal route. The downshifting photoluminescence properties of all samples are analyzed in detail, and the luminescence mechanism is further elucidated by fluorescence decay lifetime. Upon excitation at 354 nm, a strong blue emission band(400–500 nm) is observed for Cs 2 NaBiCl 6 :Sb 3+ , which comes from self-trapping exciton(STE) recombination of distorted [SbCl 6 ] 3– . Benefiting from Sb 3+ -induced local structural modification and narrow optical band gap, both STE broadband and Sm 3+ ions visible luminescence emissions are significantly boosted through free exciton(FE) sensitization in Cs 2 NaBiCl 6 :Sb 3+ /Sm 3+ sample. In addition, the luminescence thermal performances of Cs 2 NaBiCl 6 :Sb 3+ /Sm 3+ sample are investigated from 93 to 293 K. The luminescence thermal enhancement phenomenon is obtained at lower temperature range. The optical temperature sensing performance is discussed with luminescence intensity ratio technique, with maximum relative sensitivity of 5.676 % K −1 at 213 K. Finally, the anti-counterfeiting application of Cs 2 NaBiCl 6 :Sb 3+ /Sm 3+ sample is elaborated due to their bright multi-color emission under different excitation and temperature.
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高影响因子
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