RSC Advances
·
2015
·Vol. 5
·期 108
·89290-89298
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IF 3.84
Lili Wang,Byung Kee Moon,Sung Heum Park,Jung Hwan Kim,Jinsheng Shi,Kwang Ho Kim,Jung Hyun Jeong
A novel Sm3+-doped Sr2CaWO6 (SCWO) red phosphor, synthesized though a solid-state reaction, was reported. Its crystal structure was analyzed and refined via the Rietveld full-pattern fitting method based on XRD patterns. The CASTEP module of Materials Studio was used to investigate the band structure and density of states of the SCWO. The optical band gap was calculated through the UV-vis diffuse reflectance spectrum and compared with the value predicted by the DFT method. Raman spectra were recorded to confirm the substitution of cations by Sm3+ ions. The broad W–O charge transfer band and narrow excitation band at 406 nm from Sm3+ ions have comparable intensities in SCWO:Sm3+. After the introduction of charge compensators Li+, Na+ or K+, the intensity of the near-UV excitation band at 406 nm was almost twice as much as before. The profiles of the emission spectra under excitation into the charge transfer absorption and f–f transition of Sm3+ are different, and low-symmetry Sm3+ centres are preferentially excited via f–f absorption transitions. The intensity ratios of electronic, magnetic dipole-allowed transitions under different radiations show that the charge compensators can influence the chemical environment around Sm3+.
研究领域:
材料科学
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固体化学
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发光材料
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晶体学
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电子结构理论
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无机功能材料
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2014
·
IF 3.84
Yizhong Shen,Shaopu Liu,Jidong Yang,Linlin Wang,Xuanping Tan,Youqiu He
A novel and sensitive turn-on fluorescent biosensor for herring sperm DNA (hsDNA) detecting was designed based on hsDNA-induced fluorescence enhancement of Sm 3+ -modulated glutathione (GSH)-capped CdTe quantum dots (QDs). The fluorescent biosensor was based on the following two properties. First, the high fluorescence of GSH-capped CdTe QDs could be effectively quenched by Sm 3+ due to the binding of Sm 3+ to the GSH on the surface of the QDs and the electron transfer from the photoexcited GSH-capped CdTe QDs to Sm 3+ . Second, the high affinity of hsDNA to Sm 3+ enabled Sm 3+ to be dissociated from the surface of GSH-capped CdTe QDs to form more stable complex with hsDNA in aqueous solution, thereby enhancing the fluorescence of Sm 3+ -modulated GSH-capped CdTe QDs. Experimental results showed that the enhanced fluorescence intensity of Sm 3+ -modulated GSH-capped CdTe QDs was directly proportional to the concentration of hsDNA in the range from 0.012 to 14.0 μg mL −1 with a good correlation coefficient of 0.9977, and the detection limit (3 σ / S ) was 3.61 ng mL −1 . To further investigate perfect analysis performance, the developed biosensor was applied to the determination of hsDNA in synthetic samples and human fresh serum samples with satisfactory results.
研究领域:
生物化学
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分析化学
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Changlin Li,Siyu Cheng,Yilian Ran,Xiya Miao,Dongze Li,Yangyu Su,Yuchen Yang,Xianchao Du,Xiang Liu,Ruijin Yu
The novel orange-red emitting K 5 Y(MoO 4 ) 4 : x Sm 3+ (KYMO: x Sm 3+ ) (1 mol% ≤ x ≤ 35 mol%) phosphors were synthesized through solid-phase reaction. The KYMO:Sm 3+ phosphors were mainly analyzed for purity phase, luminescence properties, and thermostability. Under 403 nm excitation, KYMO:10 mol%Sm 3+ possesses four distinct emission peaks. The dominant emission peak is situated at 645 nm, corresponding to the 4 G 5/2 → 6 H 7/2 electron transitions. With x = 10 mol%, the KYMO: x Sm 3+ phosphor has the optimal doping concentration. The color purity reaches as high as 99.9 %. KYMO:10 mol%Sm 3+ presents good thermostability with T 0.5 > 480 K and resistance to color drift (Δ E = 0.012 at 420 K). The lifetime for KYMO:10 mol%Sm 3+ is 1.16 ms. The internal quantum efficiency (IQE) reaches 62.74 %. At 480 K, the maximum temperature sensing sensitivities of the FIR of I 564 /I 599 are 5.19 × 10 −4 ( S a ) and 18 % ( S r ). The assembled WLED displays an excellent color rendering index (CRI, R a ) of 94, Commission International de L′ Eclairage (CIE) coordinates (0.333, 0.346), and a correlated color temperature (CCT) of 5464 K. In summary, KYMO:Sm 3+ phosphors possess great promise for high CRI white-light-emitting diodes (WLEDs) and potential feasibility for temperature sensing.
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 RARE EARTHS
·
2018
·
IF 2.524
Jiayu Li,Ran Pang,Zhan Yu,Liyan Liu,Haiyan Wu,Huimin Li,Lihong Jiang,Su Zhang,Jing Feng,Chengyu Li
A novel orange-red emitting Ba 3 Y 4 O 9 :Sm 3+ phosphors were prepared by a high temperature solid-state reaction in air. X-ray diffraction (XRD), photoluminescence spectra, fluorescence decay and temperature-dependent emission spectra were utilized to characterize the structure and luminescence properties. The results show that the excitation spectrum includes a series of linear peaks at 350, 367, 382, 410, 424, 445, 470 and 495 nm, respectively. Under 410 nm excitation, the emission peaks were located at 574 nm ( 4 G 5/2 — 6 H 5/2 ), 608 nm ( 4 G 5/2 — 6 H 7/2 ), 659 nm ( 4 G 5/2 — 6 H 9/2 ) and 722 nm ( 4 G 5/2 — 6 H 11/2 ), respectively. The concentration quenching occurs when x equals 0.08 for Ba 3 Y 4– x O 9 : x Sm 3+ phosphor and its mechanism is ascribed to the dipole–dipole interaction. The chromaticity coordinates of Ba 3 Y 3.92 O 9 :0.08Sm 3+ phosphor are in the orange-red region. The temperature-dependent study shows that this phosphor has excellent luminescence thermal-stability. And the luminescence intensity of Ba 3 Y 3.92 O 9 :0.08Sm 3+ phosphor at 473 K only declines by about 25.75% of its initial intensity. The experimental data indicate that Ba 3 Y 4 O 9 :Sm 3+ phosphor may be promising as an orange-red emitting phosphor for white light emitting diodes .
研究领域:
材料科学
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光电
·
发光材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Weiping Zhou,Chenyu Ma,Chunlin Ma,Zhangyin Zhai,Weishi Tan
A series of Sm 3+ doped 0.92(Na 0.5 Bi 0.5 )TiO 3 -0.08(Ba 0.90 Ca 0.10 )(Ti 0.92 Sn 0.08 )O 3 (NBT-8BCTS: x Sm 3+ , x = 0–0.025) lead-free piezoelectric ceramics are fabricated via a conventional solid-state reaction method, and their phase structure, photoluminescence properties and temperature dependent of luminescence spectra are studied in detail. The emission spectra with dominant orange-red emission consist of four emission peaks at 542 nm, 598 nm, 644 nm and 709 nm, which are ascribed to the 4 G 5/2 → 6 H J/2 (J = 5, 7, 9, 11) transition of Sm 3+ ions, respectively. Furthermore, the optical temperature sensing properties of the NBT-8BCTS: 0.01Sm 3+ ceramic in the temperature range between 313 K and 533 K are analyzed with a maximum relative sensitivity 1.29%K −1 at T = 463 K. Besides, the phosphors exhibit excellent stable temperature sensing performance under repeated heat-cooling cycles. These results suggest that the Sm 3+ doped NBT-8BCTS ceramics may have potential applications in multifunctional sensing devices by integrating its optical temperature sensing and intrinsic ferroelectric property .
研究领域:
材料科学
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光学
·
物理学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Chonghui Qi,Deyuan Yang,Longjie Zhang,Huangyao Chen,Xinyong Gong,Ruirui Cui,Chaoyong Deng
Lead-free double perovskites (LFDPs) have attracted considerable attention in recent years owing to their distinctive optical characteristics. While multi-component phosphor blends dominate commercial white light-emitting diode (WLED), the pursuit of efficient white light generation from a single crystalline lattice has yet to overcome critical bottlenecks in emission harmonization. In this study, we present a triple-doped rare-earth double perovskite, Cs 2 NaLuCl 6 : Sb 3+ , Tb 3+ , Sm 3+ . We pioneer a competitive energy transfer engineering strategy in this material, in which orchestrated energy routing from Sb 3+ to Tb 3+ and Sm 3+ enables precise spectral harmonization. This overcomes the long-standing efficiency-color quality trade-off in single-matrix WLEDs, which can be precisely controlled via dopant ratio optimization. Both steady-state and time-resolved photoluminescence (PL) spectroscopy were used to investigate the synthesis and luminescence behavior of the triple-doped Cs 2 NaLuCl 6 : Sb 3+ , Tb 3+ , Sm 3+ . Analysis of the PL spectra reveals three key energy transfer mechanisms: (i) Sb 3+ → Tb 3+ , (ii) Sb 3+ → Sm 3+ , and (iii) Tb 3+ → Sm 3+ . Temperature-dependent PL spectra demonstrate exceptional thermal stability, and the luminous intensity decreases by only 8.8 % at high temperatures of 473 K. By fine-tuning the dopant concentrations, precise control over the CIE coordinates within the white-light region is achieved, driven by competitive energy transfer dynamics. In addition, the photoluminescence quantum yield (PLQY) reaches 38.29 % in a Cs 2 NaLuCl 6 Single Crystal (SC) co-doped with 0.5 % Sb 3+ , 60 % Tb 3+ , and 25 % Sm 3+ . When incorporated into WLED devices, these phosphors deliver a color rendering index (CRI) of 94.7, a correlated color temperature (CCT) of 5018 K, and a near-ideal white light emission with CIE coordinates of (0.344, 0.338). This work provides a high-performance single-matrix white light emitter for WLEDs and a practical energy transfer design strategy for rare-earth-doped LFDPs, promising to advance lead-free perovskite applications in solid-state lighting.
研究领域:
材料科学
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光学材料
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固态照明
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光子学
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无机化学
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产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 107
·期 5
·3012-3027
·
IF 3.9
Rong Tang,Yue Yang,Ya Yang,Xuan Ouyang,Junzhi Che,Shigao Chen,Xuemei Yao,Bin Deng,Ruijin Yu
A sequence of reddish-orange emitting NaSrBi (1− x ) TeO 6 : x Sm 3+ phosphors were successfully composited by a favorable solid-phase chemical process. The sintering temperature is optimized as 850°C. NaSrBiTeO 6 (NSBTO):Sm 3+ samples were assigned to the cubic double-perovskite structure, exhibiting the space group of Fm 3 ¯ $\bar{3}$ m (225). Photoluminescence emission spectra display the main peaks at 562, 598, 645, and 705 nm at 404 nm excitation. Among them, the most intense emission peak is at 645 nm. The concentration-quenching mechanism of Sm 3+ follows the interaction between electric dipoles and quadrupoles. The asymmetric ratio (I( 4 G 5/2 - 6 H 9/2 )/I( 4 G 5/2 - 6 H 5/2 ) of NSBTO:2 mol%Sm 3+ phosphor is extracted as 4.96. The optimum NSBTO:2 mol%Sm 3+ phosphor has excellent thermal stability with a remained emission intensity riches 93.61% (420 K). After testing with high-pressure water steam at various periods, the phosphor remains chemically stable for moisture resistance. For the NSBTO:2 mol%Sm 3+ phosphor, the satisfactory color purity and low correlated color temperature (CCT) are obtained with 99.9% and 1494 K, respectively. The electroluminescence spectra of the prepared red light emitting diode (LED) are in conformity with the phytochrome absorption spectra of chlorophyll a, chlorophyll b, P FR , and P R . The white light-emitting diode (w-LED) is also perfectly packaged, obtaining an efficient color rendering index ( R a ) of 92.12 and CCT of 5553 K. These exceeding optical properties certified that NaSrBi (1− x ) TeO 6 : x Sm 3+ demonstrates promising prospects and can be efficiently applied in horticultural LED applications.
研究领域:
材料科学
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光学工程
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农业科学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Shanshan Ye,Chen Shi,Jiancong Zhou,Jianyan Ding,Quansheng Wu
Temperature sensor and field emission displays (FED) are the intensive topics for Sm 3+ activated red phosphor. In this study, a novel lithium nitride red phosphor Li 2 CaSi 2 N 4 :Sm 3+ was successfully prepared by solid phase method. The photoluminescence and cathodoluminescence performances were systematically studied to explore the possibility in FED and temperature sensor applications . The results indicate that the Li 2 CaSi 2 N 4 :Sm 3+ phosphor features intense red emission under the UV light and cathode ray excitations. The phosphor also has a long red afterglow with an afterglow time of 12.7 min. Most importantly, Li 2 CaSi 2 N 4 :Sm 3+ exhibits excellent temperature sensitivity with the relative sensitivity of 4.8% K −1 @473 K, which is higher than other temperature sensor materials. The thermal quenching mechanism was proposed based on a configurational-coordinate model. Moreover, excellent cathode ray saturation and aging resistance were observed in Li 2 CaSi 2 N 4 :Sm 3+ . The results indicate that Li 2 CaSi 2 N 4 :Sm 3+ is a potential temperature sensor and FED materials.
研究领域:
材料科学
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光电技术
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温度传感
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显示技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2012
·
IF 2.289
Decai Huang,Youfu Zhou,Wentao Xu,Zhangfu Yang,Zhuguang Liu,Maochun Hong,Yuanhua Lin,Jianchang Yu
The red phosphor Na 5 Eu(WO 4 ) 4 activated with trivalent M 3+ (M 3+ = Bi 3+ , Sm 3+ ) ions were prepared through the solid state reaction technique. The properties of structure, morphology, photoluminescence were characterized systematically. The lattice parameters were refined by Rietveld method. The emission spectra, excitation spectra, and decay curves were employed to study the luminescent behaviors. Both of Bi 3+ and Sm 3+ doping could increase the red-emitting intensity and corresponding quantum efficiency (QE) of Na 5 Eu(WO 4 ) 4 host. Furthermore, the color rendering index of the commercial yellow phosphor YAG:Ce 3+ was increased from 44.5 to 50.8 and 50.2 by mixed with Na 5 Eu 0.8 Bi 0.2 (WO 4 ) 4 and Na 5 Eu 0.96 Sm 0.04 (WO 4 ) 4 phosphors under 465 nm excitation, respectively. The CIE chromaticity coordinates of these phosphors are close to the standard value for red. Herein, the present materials are promising candidates as red phosphors for white light emitting diodes with near-UV/blue GaN-based chips.
研究领域:
材料科学
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光电
·
光子学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yixuan Zhao,Lu Liu,Li Zhou,Ruiqi Yang,Changlin Li,Jiexin Chen,Ziyue Hu,Haoran Su,Bin Deng,Xiaohui Ji,Ruijin Yu
New Sm 3+ doped Cd 2 MgTeO 6 tellurate red-emitting phosphors with Na + ions as charge compensation were obtained using a high-temperature solid-state approach at 1000 °C. During this study, the prepared phosphors were subjected to phase purity, particle morphology , luminescence characteristics, thermal stability, and Commission Internationale de L′ Eclairage (CIE) chromaticity. The critical quenching concentration of Sm 3+ doped Cd 2 MgTeO 6 phosphor was 2 mol%. According to Dexter's theory and the calculated R c value (22.21 Å), the dipole-dipole interaction causes the phenomenon of concentration quenching. Particularly, the Cd 2 MgTeO 6 :2 mol%Sm 3+ , 2 mol%Na + phosphor exhibited an evident red-light emission (647 nm) at λ ex = 407 nm because of the 4 G 5/2 to 6 H 9/2 level transition of Sm 3+ . Its internal quantum efficiency (IQE) was 38.87%. It is worth noting that the Cd 2 MgTeO 6 :Sm 3+ , Na + phosphor exhibited abnormal thermal quenching (ATQ) characteristics, and the luminous intensity of the Cd 2 MgTeO 6 :2 mol%Sm 3+ , 2 mol%Na + increased by 7.20% at 480 K compared with the initial temperature. In addition, white LEDs and red LEDs were successfully manufactured with a 408 nm chip. The prepared red LED showed the emission spectrum similar to the absorption spectrum of Phytochrome P r , which is expected to be applied in plant growth. The w-LED had a CCT (correlated color temperature) of 4790 K, color rendering index of 91, and color coordinates of (0.348, 0.335). Therefore, the Cd 2 MgTeO 6 :Sm 3+ , Na + phosphor has demonstrated potential applications in w-LEDs and plant growth LEDs.
研究领域:
材料科学
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光学工程
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农业科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Weijia Guo,Peiyao Zhao,Zhenxing Yue
Passive electronic components made from dielectric ceramics can hardly operate at extremely high temperatures, which is attributed to the sharply increasing dielectric loss and leakage conductance. In this work, the widely applicated CaTiO 3 ceramics are used as the matrix, and the high-temperature electrical properties are modified by doping Sm 3+ and Al 3+ . The Sm-doping in CaTiO 3 ceramics can significantly suppress the dielectric relaxation at low frequencies and reduce the high-temperature leakage conductance. Continued doping of Al in Ca 0.6 Sm 0.27 TiO 3 ceramics can further reduce the high-temperature dielectric loss and conductivity. These changes are associated with tighter crystal structures and fewer defects in the ceramics. With Sm and Al doping, the high-temperature dc conductivity of the ceramics is reduced by about 4 orders of magnitude, and a dielectric loss of less than 0.02 and a low temperature cofficient of capacitance (TCC) of − 25 ppm/℃ are obtained over a wide temperature range of room temperature to 530 ℃. Outstanding temperature stabilities are exhibited over a temperature range of 25 ∼ 200 ℃ in energy storage performance and charge-discharge property. Extremely fast discharge speed ( t 0.9 = 16 ns) makes it suitable for pulsed power electronic systems. Such linear dielectric materials are expected to be used in harsh environment of high temperatures.
研究领域:
材料科学
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电气工程
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陶瓷
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2025
·
IF 3.5
Lanwei Qiu,Haochang Ye,Guangting Xiong,Wei Zhang,Yirong Huang,Qiuzhi Liang,Canhui Pan,Jinquan Chen,Zuyong Feng
Orange-red KLa(WO 4 ) 2 phosphors co-doped with Sm 3+ -Gd 3+ were synthesized via high-temperature solid-state reaction. Phase purity and crystal structure were confirmed by XRD, while SEM revealed non-uniform particle distribution. XPS verified elemental composition and suggested the chemical states of dopants. Under 403 nm excitation, KLa(WO 4 ) 2 : Sm 3+ exhibited intense orange–red emissions, dominated by the 4 G 5/2 - 6 Hᵢ (i = 5/2, 7/2, 9/2, 11/2) transition from 500 to 750 nm. Substitution by Gd 3+ lowers the local symmetry, as evidenced by the increased asymmetry ratio, resulting in a 1.88-fold increase in emission intensity. Notably, the optimized phosphor, KLa 0.8 Gd 0.15 (WO 4 ) 2 :0.05Sm 3+ , exhibits a high color purity (CP) of 99 % and excellent thermal stability retaining 85 % of its room-temperature emission intensity at 423K. When combined with a 405 nm InGaN chip, the fabricated LED displayed strong spectral overlap with chlorophyll and phytochrome absorption peaks, confirming its potential for plant-growth illumination.
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高影响因子
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