JOURNAL OF LUMINESCENCE
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2023
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IF 3.6
Xiaopeng Hu,Anlin Zhang,Huapeng Sun,Fanhua Zeng,Yanhua Lei,Lianwu Xie,Ruijin Yu,Bin Deng,Huihong Lin
Novel red-emitting phosphors, Sr 3 LaTa 3 O 12 :Eu 3+ (SLTO:Eu 3+ ), have been successfully synthesized for use in white light-emitting diodes (w-LEDs) and latent fingerprint (LFP) visualization applications. The crystalline structure, bandgap, and photoluminescence (PL) of the SLTO:Eu 3+ phosphors were thoroughly investigated. Under 395 nm excitation, SLTO:Eu 3+ phosphors emitted orange-red light at the wavelength of 616 nm due to the 5 D 0 - 7 F 2 transition of Eu 3+ ions. The optimal doping concentration of the phosphor is x = 0.30 and the neighbor ions interaction is the most critical factor in the concentration quenching mechanism of the SLTO:Eu 3+ phosphor. Furthermore, the SLTO:0.30Eu 3+ phosphor exhibit higher thermal stability compared to the conventional red phosphor (Sr 2 Si 5 N 8 :Eu 2+ ). The packaged w-LED showed a correlated color temperature (6887 K), excellent color rendering index (95), and Commission International de l'Eclairage (CIE) coordinates of (0.305, 0.334). The SLTO:0.30Eu 3+ phosphor effectively detected level 1–3 structures of LFPs under ultraviolet irradiation , and ultimately detected LFPs in various daily life circumstances. These findings indicate that the SLTO:0.30Eu 3+ phosphor might be a viable option for w-LED lighting applications and LFPs visualization.
研究领域:
材料科学
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光学
·
法医学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
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2023
·
IF 3.6
Yufeng Du,Yuxin Li,Yixuan Zhao,Xinyu Zhang,Changlin Li,Ruiqi Yang,Zhequan Zou,Jingjing Lian,Jinyou Duan,Huihong Lin,Ruijin Yu
A new series of red luminescent Cd 2 MgTeO 6 : x Eu 3+ ( x = 0.5–50 mol%) phosphors was successfully synthesized through a high-temperature solid-phase reaction at 1000 °C. The synthesized phosphors were investigated for their phase purity, surface morphology , elemental distribution, and luminescence properties. Strong orange-red light emission (617 nm) was observed upon excitation at 398 nm, which was attributed to the electric dipole 5 D 0 - 7 F 2 transition of Eu 3+ . The optimal doping concentration was found to be x = 20 mol%. Concentration quenching mechanism was identified as the interaction of near-neighbor ions. The chromaticity coordinates of all the Cd 2 MgTeO 6 :Eu 3+ samples were found to be located in the red region and were almost the same. The Cd 2 MgTeO 6 : 20 mol%Eu 3+ phosphors exhibited an unusual thermal quenching behavior, maintaining 102% of the initial intensity, thus possessing excellent thermostability. Moreover, the manufactured white light diode demonstrated a good color rendering index ( R a = 89) with the coordinates of (0.344, 0.330) by the Commission International de L'Eclairage (CIE). Additionally, the Cd 2 MgTeO 6 : 20 mol%Eu 3+ phosphor was surface-functionalized with oleic acid (OA) (Cd 2 MgTeO 6 : 20 mol%Eu 3+ @OA) to aid in the identification of Level I-III fingerprint details with high resolution and contrast. Good visualization of the latent fingerprint (LFP) was observed on different substrates. Therefore, Cd 2 MgTeO 6 :Eu 3+ phosphors hold great promise for the visualization of w-LEDs and LFPs.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
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2022
·
IF 4.171
Zijing Zhou,Anlin Zhang,Li Zhou,Ziyue Hu,Yixuan Zhao,Jiexin Chen,Yanyan Li,Lei Zhao,Bin Deng,Ruijin Yu
In the present work, a series of zincate CaY 2 Sb 2 (ZnO 4 ) 3 :Eu 3+ phosphors were successfully obtained via the conventional solid-state method at high temperature. The phase purity, morphology, element mapping, photoluminescence excitation/emission (PLE/PL), and decay time of the obtained phosphors were investigated systematically. Results show that the synthesized samples demonstrate the strongest red-emitting peak at 610 nm under the n-ultraviolet (n-UV) 395 nm excitation. The Judd-Ofelt parameters (Ω 2 , Ω 4 ), radiative transition rates, and branching ratios ( β 0 J, J = 2, 4) of CaY 2 Sb 2 (ZnO 4 ) 3 :Eu 3+ to explore the Eu 3+ -coordinated environment in the host matrix. The concentration quenching of CaY 2 Sb 2 (ZnO 4 ) 3 :2 x Eu 3+ phosphors happened until at high doping concentration of x = 50 mol%. CaY 2 Sb 2 (ZnO 4 ) 3 :100 mol%Eu 3+ sample presented the excellent thermal stability with abnormal thermal quenching behavior. Compared with the commercial Y 2 O 3 :Eu 3+ red phosphor , the luminescent intensity of the prepared phosphor is 1.14 times stronger. The high internal quantum efficiency (IQE) of CaY 2 Sb 2 (ZnO 4 ) 3 :100 mol%Eu 3+ phosphor is 79.20%. In addition, the fabricated red and white light-emitting diodes (w-LEDs) both emit bright light. The w-LED demonstrates a high color rendering index ( R a = 96) and a low correlated color temperature (CCT = 5249 K). Therefore, the prepared red-emitting phosphor has a promising application in w-LEDs.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
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2023
·
IF 4.6
Baofeng Zheng,Yanhua Song,Zhibo Zheng,Yanxia Zhao,Qing Yang,Zhan Shi,Bo Zou,Haifeng Zou
A novel green-light-emitting silicon-based oxynitride phosphor Ca4Y3Si7O15N5:Eu2+ with low thermal quenching and ideal pressure sensitivity is reported. The Ca3.99Y3Si7O15N5:0.01Eu2+ phosphor can be efficiently excited by 345 nm ultraviolet light and shows very low thermal quenching (integrated and peak emission intensities at 373 and 423 K were 96.17, 95.86, and 92.73, 90.66% of those at 298 K, respectively). The correlation between high thermal stability and structural rigidity is investigated in detail. The white-light-emitting diode (W-LED) is assembled by depositing the obtained green-light-emitting phosphor Ca3.99Y3Si7O15N5:0.01Eu2+ and commercial phosphors on a ultraviolet (UV)-emitting chip (λ = 365 nm). The CIE color coordinates, color rendering index (Ra), and corrected color temperature (CCT) of the obtained W-LED are (0.3724, 0.4156), 92.9, and 4806 K, respectively. In addition, when subjected to in situ high-pressure fluorescence spectroscopy, the phosphor exhibits an evident red shift of 40 nm with an increase in pressure from 0.2 to 32.1 GPa. The phosphor has the advantage of high-pressure sensitivity (dλ/dP = 1.13 nm GPa–1) and visualization with pressure changes. The possible reasons and mechanisms are deeply discussed in detail. Based on the above advantages, Ca3.99Y3Si7O15N5:0.01Eu2+ phosphor is expected to have potential applications in W-LEDs and optical pressure sensing.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2018
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IF 3.779
Jiasong Zhong,Xiao Chen,Daqin Chen,Meijiao Liu,Yiwen Zhu,Xinyue Li,Zhenguo Ji
Developing a novel non-rare-earth activated oxide red phosphor with admirable luminescent performance and low cost is still of great interest in the field of energy-saving warm white light-emitting diodes (w-LEDs) illumination. Here, Li 3 Mg 2 SbO 6 :Mn 4+ (LMSO:Mn 4+ ) red-emitting phosphor has been successfully prepared with cheap raw materials via a traditional solid-state method. Crystal structure, morphology, composition as well as optical properties are studied in detail. The prepared LMSO:Mn 4+ phosphor exhibits a broad and deep red emission band in the range of 600–750 nm with the maximum centered at 666 nm, which is ascribed to the Mn 4+ : 2 E g → 4 A 2g transition in [SbO 6 ] octahedral environment. Moreover, the nephelauxetic effect of Mn 4+ in the LMSO matrix is evaluated by investigating the crystal field strength (Dq) and Racah parameters (B and C). Importantly, LMSO:0.01Mn 4+ phosphor demonstrates good thermal stability and high quantum efficiency. By embedding LMSO:Mn 4+ and Y 3 Al 5 O 12 :Ce 3+ phosphors with various ratios in the TeO 2 -based glass host, a series of phosphors-in-glass(PiG) composites are achieved and demonstrate to remain the original optical properties of phosphors. Remarkably, by coupling PiG color converters with a blue LED chip, high-power w-LEDs devices with tunable optoelectronic parameters are constructed, with the correlated color temperature evolving from cool white (6783 K) to warm one (4014 K) and the color rendering index increasing from 72.2 to 88.7.
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
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Yifang Lin,Daomiao He,Kezhou Jiang,Renkang Qin,Jingfei Wang,Yumeng Shao,Jiaxin Yan,Ruijin Yu,Dan Zhang,Shouan Xie,Lei Zhao
A new series of red luminescent K 5 La(MoO 4 ) 4 : x Eu 3+ (KLMO: x Eu 3+ ) phosphors ( x = 0.05–1.00 mol) was successfully synthesized by a high-temperature solid phase reaction at a low reaction temperature (600 ℃). The X-ray diffraction (XRD) pattern, photoluminescence properties, thermal quenching mechanism, quantum efficiency, and lifetime decay curves of the phosphors were measured and discussed in detail. The prepared phosphors exhibited strong red-light emission (at 615 nm) upon excitation at 394 nm, attributed to the electric dipole 5 D 0 - 7 F 2 transition of Eu 3+ . The optimal doping concentration of phosphors is 0.8 mol. The quenching temperature of the KLMO:0.80Eu 3+ phosphor was found to exceed 480 K, with high activation energy ( E a ) of 0.43 eV, showing good thermal stability. Impressively, the KLMO:0.80Eu 3+ phosphor with a 0.8 mol concentration of Eu 3+ doping also has an internal quantum efficiency (IQE) of up to 84.5%. The packaged white light emitting diode (w-LED) showed a good color rendering index (CRI) (89), correlated color temperature (CCT) (5117 K), and the Commission International de L′Eclairage (CIE) chromaticity coordinates (0.342, 0.345). Furthermore, the KLMO:0.80Eu 3+ phosphor was surface-functionalized with oleic acid (OA) (KLMO:0.80Eu 3+ @OA) to help better identify Level I-III fingerprint details with high resolution and contrast. The results show that the KLMO:Eu 3+ and KLMO:Eu 3+ @OA phosphors have very promising applications in the w-LEDs and latent fingerprints (LFPs).
研究领域:
材料科学
·
光学
·
法医学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2024
·
IF 4.4
Houteng Zhao,Yilian Ran,Xiya Miao,Siyu Cheng,Dongze Li,Yufeng Du,Xiang Liu,Ruijin Yu
A series of novel phosphors, doping Eu 3+ and Na + ions in the Sr 3 MgNb 2 O 9 (SMNO) crystal lattice (SMNO: x Eu 3+ , x Na + , x = 0.5–30 mol%), was successfully synthesized through high-temperature solid-state reaction. X-ray diffraction (XRD) analysis and Rietveld refinement confirmed the successful synthesis of SMNO:Eu 3+ , Na + . The phosphor belongs to the hexagonal crystal system and the P 3 ¯ m 1 (No.164) space group. The bandgap energy of SMNO was calculated with Materials Studio and measured with the use of diffuse reflectance spectroscopy. The excitation spectrum of SMNO:Eu 3+ , Na + displays multiple narrow absorption peaks in the violet-blue region as well as a charge transfer band (CTB) near 300 nm, exhibiting the highest peak at 394 nm. Four distinct characteristic peaks are observed in the emission spectrum of SMNO:Eu 3+ , Na + . Notably, the peak at 601 nm shows the highest emission intensity due to the radiative transition from 5 D 0 → 7 F 2 . By varying doping concentrations, it was determined that an optimal concentration of 5 mol%Eu 3+ resulted in phosphors, with high color purity exceeding 99 %. Concentration quenching is attributed to the nearest neighbor ions interaction. Furthermore, SMNO:Eu 3+ , Na + exhibited good stability in 300–480 K, with luminescent intensity remaining 68.6 % at 420 K and 54.4 % at 480 K compared to room temperature (300 K). The internal quantum efficiency (IQE) of SMNO:5%Eu 3+ , 5 %Na + is 65.0 %. Both red and white light-emitting diodes (LEDs) were prepared using SMNO:Eu 3+ , Na + . The chromaticity coordinates of w-LED were measured as (0.357, 0.376), correlating to a correlated color temperature (CCT) of 4685 K and exhibiting a good color rendering index (CRI, R a = 88). Additionally, the latent fingerprint (LFP) development demonstrated clear visualization of Levels I-III characteristic structures of fingerprints when utilizing SMNO:Eu 3+ , Na + . These findings suggest promising applications for SMNO:Eu 3+ , Na + in w-LED lighting and LFP development.
研究领域:
材料科学
·
光学
·
法医学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Xuemei Yao,Yatuan Ma,Xiya Miao,Shulei Li,Yufeng Du,Yun Cheng,Yue Yang,Xianchao Du,Huajuan Deng,Huiling Geng,Ruijin Yu
The propensity of carbon dots (CDs) to undergo significant self-quenching in the solid state, whether due to excessive resonance energy transfer or direct molecule collision, has significantly limited their application in light-emitting diodes (LEDs). However, incorporating electron-deficient boron atoms, guanidine functional groups, and boron hydroxyl groups proves advantageous in forming a hydrogen bond structure network. This network effectively suppresses the self-quenching phenomenon observed in solid CDs, thereby enhancing their potential for use in LEDs. Therefore, on this basis, a series of multicolor tunable solid-state fluorescent CDs were obtained, and their formation mechanism was discussed. The structure and morphology of the prepared series of multicolor tunable CDs were also characterized. The photoluminescence quantum yield (PLQY) of B-CD, Y-CD, and R-CD is 34.3 %, 23.7 %, and 20.5 %, respectively. The prepared series of CDs were used to successfully package the red, blue, and yellow monochromatic LEDs. By adjusting the ratio of CDs of different colors, a single matrix white-LEDs (w-LEDs), two primary colors w-LEDs, and the full-carbon-based w-LED of three primary colors are also obtained. The correlated color temperature of the above three w-LEDs is 7277, 3957, and 5040 K, the Color Rendering Index is 88, 91, and 92, and color coordinates are (0.302, 0.319), (0.376, 0.355), and (0.344, 0.354), respectively. It is demonstrated that CDs are a promising material in the solid-state lighting field.
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
JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Jiayi Li,Xingyu Chen,Di Gao,Mengxue Zhang,Mengkun Zhang,Siyan Wang,Xiang Liu,Ruijin Yu
The synthesis of CsSr 3 La(PO 4 ) 3 F: x Eu 3+ phosphors ( x = 1, 2, 5, 10, 20, 30, 40, and 50 mol%) with fluorapatite-type structure was successfully accomplished through a direct solid-state reaction in this work. A systematic characterization was carried out, encompassing the crystal structure, phase composition , morphology, optical properties , and diverse applications of the samples. The crystalline structure of CsSr 3 La(PO 4 ) 3 F belongs to the hexagonal system with space group P 6 3 / m (176), displaying two polyhedral structures [A Ⅰ O 9 ] and [A Ⅱ O 6 F]. The band gap ( E g ) of the material CsSr 3 La(PO 4 ) 3 F is 5.823 eV. At the excitation of 393 nm, CsSr 3 La(PO 4 ) 3 F:30 mol%Eu 3+ phosphor exhibits a primarily significant emission peak at 703 nm, referring to the 5 D 0 → 7 F 4 transition due to a highly polarizable chemical environment and a distorted coordination polyhedron around Eu 3+ ions. The concentration quenching process is attributed to the quadrupole-quadrupole interaction between Eu 3+ ions, with the maximum luminescence intensity achieved at a doping content of 30 mol%. At 420 K, the emission intensity of the CsSr 3 La(PO 4 ) 3 F:30 mol%Eu 3+ phosphor can still maintain 75.04 % of the emission intensity observed at 300 K. The value of activation energy is 0.18 eV. The maximum absolute and relative thermal sensitivities ( S a and S r ) for the temperature sensor can reach 5.25 × 10 −4 K −1 and 7.71 % K −1 , respectively. The made-up red LED is well-suited to meet the light requirements for the growth and development of plants. The fabricated white light-emitting diode (w-LED) has a relatively high color rendering index ( R a ) of 89 and a suitable correlated color temperature (CCT) of 4392 K. The phosphors have applications in temperature sensors, plant growth lighting, and w-LEDs.
研究领域:
材料科学
·
光学工程
·
植物学
·
电子工程
✓ 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）