CERAMICS INTERNATIONAL
·
2025
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IF 5.6
Xufeng Zhou,Quansheng Wu,Wanying Geng,Jianyan Ding
The development of highly efficient and thermally stable Bi 3+ -activated phosphors has emerged as a central focus in current research on phosphor materials. Based on the Bi 3+ -based metal-to-metal charge transfer (MMCT) transition and the characteristic of possessing a rigid crystal structure, this study successfully designed a yellow-emitting phosphor, designated as CaBaTa 2 O 7 :Bi 3+ , which exhibits high quantum efficiency and excellent thermal stability. The crystal structure, electronic structure, and luminescent properties of CaBaTa 2 O 7 :Bi 3+ were systematically investigated. Upon near-ultraviolet excitation, CaBaTa 2 O 7 :Bi 3+ emits bright yellow light centered at 552 nm, with a quantum efficiency of 96 % and thermal stability of 81 %@150 °C. The luminescence mechanism of CaBaTa 2 O 7 :Bi 3+ was explored through structural analysis, spectral characterization, and theoretical calculations, confirming that the luminescence originates from the Bi–Ta MMCT transition. Furthermore, the practical applicability of CaBaTa 2 O 7 :Bi 3+ was evaluated via WLED device packaging and hydrolysis tests. The results demonstrate that CaBaTa 2 O 7 :Bi 3+ holds significant promise for application in WLED technology.
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高影响因子
JOURNAL OF RARE EARTHS
·
2024
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IF 5.2
Qi You,Mu Liu,Chengxiang Yang,Xuan Zhou,Wei Liu,Jinkai Li,Xuchuan Jiang
Both Al 3+ and Y 3+ ions co-doped Na 4 CaSi 3 O 9 :Bi 3+ ,Eu 3+ (NCSO:Bi 3+ ,Eu 3+ ) series phosphors were synthesized by a high temperature solid-phase method, and characterized by various advanced structural and spectral instruments. The impact of different doping ion concentrations on the luminescent behavior of the phosphors was also investigated. It is found that an ion substitution strategy is useful for enhancing the luminescence performance of the as-obtained NCSO:Bi 3+ ,Eu 3+ phosphors. The results show that doping a certain amount of Al 3+ ions into the NCSO:0.01Bi 3+ ,0.1Eu 3+ phosphor leads to a significant red-shift in the blue emission spectrum of Bi 3+ up from 350 to 405 nm and an increase in the half-peak width by 21 nm, better spectral match for plant response. Furthermore, doping Y 3+ ions into the matrix also enhances the sensitization effect of Bi 3+ ions, resulting in a significant increase in luminous intensity. X-ray powder diffraction (XRD) was used to verify the crystal structure and phase purity of the synthesized phosphors. The mechanism of Al 3+ and Y 3+ doping affecting the emission spectrum is further discussed through the structure refinement. Finally, by comparing with the absorption spectra of plant growth pigments, it is found that the developed phosphors show great potential in promoting light controlling for plant growth.
研究领域:
材料科学
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光学
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植物学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Jianyan Ding,Dewu Wu,Shanshan Ye,Quansheng Wu
The advancement of narrow-band cyan-emitting phosphors activated by near-ultraviolet LED chips is crucial for creating high-efficiency, health-promoting WLED lighting. Guided by a single and symmetrical crystallographic site, a near-ultraviolet excitation, near-narrow-band, and thermally stable cyan light emission was achieved from Bi 3+ -activated garnet-structured Ca 3 Xn 2 Ge 3 O 12 :Bi 3+ (Xn = Sc, Y, Lu). When incorporated into WLEDs, the color rendering index (CRI) of devices containing Ca 3 Sc 2 Ge 3 O 12 :Bi 3+ cyan phosphor reaches 92.8, indicating potential value for healthy lighting applications. Furthermore, by integrating spectral and crystallographic data with empirical formula calculations, a comprehensive analysis of the luminescence behavior among the three Ca 3 Xn 2 Ge 3 O 12 :Bi 3+ (Xn = Sc, Y, Lu) phosphors were performed. This analysis was designed to elucidate the similarities and differences in their luminescence properties, as well as to uncover the underlying mechanisms responsible for the near-narrow-band emission of Bi 3+ . The results indicate that under the combined influence of factors volume polarization, fractional covalency, and charge of the anions, Ca 3 Xn 2 Ge 3 O 12 :Bi 3+ (Xn = Sc, Y, Lu) exhibits the same strongest excitation peak. However, due to variations in Stokes shift and bandgap, the three phosphors exhibit distinct emission peaks and thermal quenching properties. This study aims to establish fundamental principles for the development of Bi³ ⁺-activated narrow-band emission phosphors.
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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无机化学
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晶体学
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
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2020
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IF 3.28
Zhiqin Zheng,Peizhang Xie,Panpan Yi,Jun Zhao,Lihong Liu,Facheng Yi
Nowadays, ultraviolet (UV) and blue converted phosphors have played a key role in the solid-state lighting field, and the white light is usually produced by mixing multiple phosphors. In this work, we report a type of UV converted single white phosphor, i.e. , Ba 9 La 2 Si 6 O 24 :Eu 3+ ,Bi 3+ .Various techniques, such as powder X-ray diffraction (XRD), scanning electron microscopic (SEM), photoluminescence (PL) spectra, and quantum efficiency (QE), have been used to characterize the samples. In Bi 3+ doped samples, upon excitation within the wavelength range of 250–380 nm can lead to three Bi 3+ emission bands ( i.e. , 358 nm, 415 nm, and 516 nm), but only one emission band peaking at 415 nm appears when the excitation wavelength exceeds 380 nm. Structural analysis and discussion on the PL intensity variation reveal there are three Bi 3+ luminescent centers at two different La 3+ sites and one Ba 2+ site. The Bi 3+ concentration-induced luminescent quenching is dominated by the d-d interaction. In view of the spectral overlap between the Bi 3+ emissions and the Eu 3+ excitation spectra , the energy transfer from Bi 3+ to Eu 3+ of the Ba 9 La 2 Si 6 O 24 :Eu 3+ ,Bi 3+ is studied, and it is dominated by a dipole-quadrupole ( d - q ) interaction. Moreover, upon excitation at 365 nm, the emissions broadly tuning from blue, white and to red are achieved by varying the Eu 3+ content. For the white Ba 9 La 2 Si 6 O 24 :Eu 3+ ,Bi 3+ sample, high temperature PL results show that it does not have severe degradation of emission intensity after increasing the temperature from 25 to 300 °C, exhibiting a good thermal stability . To show the potential application in the lighting fields, we fabricate a white light LEDs device by depositing this white phosphor on a 365 nm UV LED chip. As a result, the values, i.e. , a color rendering index (CRI) of 95, luminous efficiency of 80 lm/W, and color temperature (CT) of ~4215 K at chromaticity (0.382, 0.398), are achieved.
研究领域:
材料科学
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发光材料
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固态照明
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无机化学
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光电子学
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DOI
高影响因子
ANALYTICA CHIMICA ACTA
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2024
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IF 5.7
Jing Feng,Lei Feng,Shuo Sun,Xujie Wang,Huitian Zhi,Ruhui Shang,Yingchao Yang,Luyao Wang,Zhengquan Yan,Lei Hu
Background NO 2 − and S 2− are two kinds of common toxic anions widely distributed in environmental water, soil and food products. Human beings have suffered a lot of diseases from intake of excessive NO 2 − or S 2− , i.e ., infantile methemoglobin , cancer and even to death. Although tremendous efforts have been afforded to monitor NO 2 − and S 2− , most were high instrument-depended with complex processing procedures. To keep food safety and to protect human health, it will be a huge challenge to develop a convenient and efficient way to monitor S 2− and NO 2 − in practice. Results A kind of folic acid capping Bi 3+ -doped Ag quantum dots (FA@Bi 3+ -Ag QDs) was developed for the first time by one-pot homogeneous reduced self-assembly. Not only did FA@Bi 3+ -Ag QDs possess intrinsic fluorescent property, it expressed synergistic peroxidase-like activity to catalyze the redox of 3,3′,5,5′-tetramethylbenzidine (TMB) and H 2 O 2 with K m / v max of 0.087 mM/6.61 × 10 −8 M s −1 and 6.42 mM/6.25 × 10 −7 M s −1 respectively. Interestingly, trace S 2− could exclusively alter its fluorescent property and peroxidase-like activity, exhibiting significant hypochromic and “turn-on” fluorescent effects. While trace NO 2 − could make FA@Bi 3+ -Ag QDs-TMB-H 2 O 2 system hyperchromic. Under the optimized conditions, FA@Bi 3+ -Ag QDs were applied for dual-mode recognition of S 2− and visual sensing of NO 2 − in real food samples with satisfactory recoveries, i.e ., 100.7–107.9 %/95.8–104.7 % and 97.2–104.8 % respectively. The synergistic enzyme-mimic mechanism of FA@Bi 3+ -Ag QDs and its selective response mechanisms to S 2− and NO 2 − were also proposed. Significance This represents the first nanozyme-based FA@Bi 3+ -Ag QDs system for dual-mode recognition of S 2− and visual sensing of NO 2 − , well meeting the basic requirement in drinking water set by WHO. It will offer a promising way for multi-mode monitoring of different pollution using the same nanozyme-based sensor.
研究领域:
环境科学
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生物医学工程
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食品科学
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DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Liang Geng,Wenjun Li,Mei Dong,Xiaohui Ma,Ajmal khan,Yanyan Li,Mengchao Li
The separation of photogenerated carriers and the efficient utilization of high-level energy electrons (HLEEs) are the key processes for improving the performance of photocatalysts. Herein, Ce 2 Ti 2 O 7 /ZnIn 2 S 4 (CTOZIS) and Bi 3+ -doped Ce 2 Ti 2 O 7 /ZnIn 2 S 4 (BCTOZIS) photocatalyst were successfully synthesized through hydrothermal method . The photocatalytic hydrogen production of CTOZIS and BCTOZIS was 1233.7 μmol g −1 and 4168.5 μmol g −1 under visible light irradiation (λ ≥ 420 nm) within 5 h, which was 2.3 and 7.6 times than that of pure ZnIn 2 S 4 , respectively. X-ray photoelectron spectroscopy, photoluminescence spectroscopy and electrochemical characterization demonstrated that after Bi 3+ doping, the electron-hole pairs recombination of BCTOZIS was inhibited, which may be ascribed to the establishment of a Z-scheme heterojunction and the presence of oxygen vacancy and Ce 4+ /Ce 3+ redox center. The doping of Bi 3+ resulted in the adjustment of the valence band position of Ce 2 Ti 2 O 7 from 1.98 V to 1.92 V. This adjustment enabled direct transfer of HLEEs generated in Ce 2 Ti 2 O 7 to the conduction band of ZnIn 2 S 4 for hydrogen production with a wavelength below 423 nm. The synergistic effect of conventional Z-scheme electron transfer and the unique utilization of HLEEs boosted the photocatalytic performance of BCTOZIS. This study affords an innovative insight for designing visible-light-driven photocatalysts with high photocatalytic activity .
研究领域:
材料科学
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能源化学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Yali Xue,Yujun Liang,Yi Dou,Haoran Li,Qiangke Wang,Xiaodeng Wu,Yongsheng Han
Reabsorption and color drift at high temperature hinder the high-quality application of the phosphor-converted white light-emitting diodes (pc-WLEDs) devices, thus it is urgent to develop the single-phase white-emitting phosphors with good chromatic stability. In this work, a series of color-tunable Y 3 TaO 7 :Bi 3+ , Eu 3+ phosphors are designed by co-doping Bi 3+ and Eu 3+ based on the crystal structure information and energy transfer principle between Bi 3+ and Eu 3+ , which can be adjusted to achieve single-phase white emission. By increasing the temperature to a high value of 473 K, the emission peak of Bi 3+ ions still present at 470 nm in Y 3 TaO 7 :Bi 3+ phosphors even when the concentration of Bi 3+ ions changes, and the characteristic emission peaks of Bi 3+ and Eu 3+ basically maintain unchanged throughout in Y 3 TaO 7 :Bi 3+ , Eu 3+ phosphors. Finally, the single-phased Y 3 TaO 7 :0.025Bi 3+ , 0.06Eu 3+ phosphor was employed with ultraviolet chip to produce a warm WLED device with color rendering index of 81.5, correlated color temperature of 4165 K and the Commission International de I′Eclairage chromaticity coordinates of (0.3645, 0.3347). The results indicate that Y 3 TaO 7 :Bi 3+ , Eu 3+ phosphors with high chromaticity stability have great application potential in full-spectrum WLEDs.
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高影响因子
JOURNAL OF LUMINESCENCE
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2021
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IF 3.599
Qijian Zhu,Jiansheng Huo,Liguo Zhang,Jinwei Gao,Qianming Wang
Green photosynthetic pigments play a major role in light-harvesting for biological substances and bio-mimetic strategy will provide a structural or functional model for natural antenna system . But the precise supramolecular structure of chlorosome has still not been clearly identified and the simulation of its function with new alternatives will be a real challenge. It has been well accepted that blue and far-red light are responsible for photosynthesis and photomorphogenesis in the process of plant growth. In this work, a series of single-composition LiLa 2 SbO 6 (abbreviated as LLSO): x Bi 3+ , y Mg 2+ , z Mn 4+ phosphors with double perovskite‐type structure and the evaluation as blue and far-red dual-emission light for plant growth light-emitting diodes (LEDs) have been reported via a high-temperature solid-state reaction method. Under near ultraviolet-light ( n -UV) excitation at 355 nm, intense blue emission (ranging from 360 to 500 nm, 3 P 1 → 1 S 0 ) from Bi 3+ and far-red emission (650–750 nm, 2 E g → 4 A 2g ) from Mn 4+ are found in Bi 3+ -Mn 4+ co-activated LLSO phosphors. To further optimize the photophysical properties, smaller Mg 2+ has been incorporated into Li + site in Bi 3+ -doped LLSO phosphor to control blue emission of Bi 3+ . With the increase of Mg 2+ content, an obvious red shift (~15 nm) of Bi 3+ emission band has been detected in the blue region, which is almost overlapped with the absorbance of Chlorophyll- B (around 450 nm). Moreover, the photoluminescence (PL) emission intensity and decay lifetime of Bi 3+ can be improved by substituting Mg 2+ for Li + . These changes should be attributed to the combined effects of the crystal field splitting and the superior lattice rigidity . Finally, the temperature-dependent PL spectra of the composition-optimized phosphor are measured, and the excellent thermal-stable emission (up to 473 K) has been obtained. It has been observed that Bi 3+ blue emission and Mn 4+ far-red emission exhibit different temperature quenching effect and such phosphor can be considered as an ideal candidate in optical thermometry.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Quansheng Wu,Yanyan Li,Yijie Wang,Hai Liu,Shanshan Ye,Lei Zhao,Jianyan Ding,Jiangcong Zhou
Investigating highly efficient narrow-band emission phosphors that have strong excitation bands in the near-ultraviolet (NUV) region is the main goal of the present light-emitting diode (LED) research, especially for Bi 3+ -activated phosphors. The naked 6s and 6p electrons of Bi 3+ are sensitive to the microenvironment, thus leading to broad emission bands, while most Bi 3+ -activated phosphors suffer from low absorption of NUV-LED chips. Here, we report on a narrow-band blue-emitting garnet-type phosphor of Sr 3 Lu 2 Ge 3 O 12 : Bi 3+ that is available for NUV-LED chips; its full width of the half maximum (FWHM) is limited to 40 nm, which is comparative to rare earth-activated phosphors, such as commercial blue phosphor BaMgAl 10 O 17 : Eu 2+ (FWHM ≈ 52 nm), and this phenomenon is extremely rare among most Bi 3+ -activated phosphors. The internal quantum efficiency (IQE) of Sr 3 Lu 2 Ge 3 O 12 : Bi 3+ can reach 57%. Moreover, it is interesting to find that Sr 3 Lu 2 Ge 3 O 12 : Bi 3+ also exhibits exalting cathodoluminescence properties and its narrow-band emission produces brilliant images with high color saturation. The significant luminescent properties of trivalent bismuth are ascribed to the compact and highly symmetrical crystal structure of Sr 3 Lu 2 Ge 3 O 12 ; thus, the discussion of the structure-property relations for Bi 3+ -activated Sr 3 Lu 2 Ge 3 O 12 is the most anticipated part of this work. The results pave the way for the design of better Bi 3+ -activated phosphors for use as white light emitting diodes (WLEDs) and field emission displays (FEDs).
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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显示技术
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DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2017
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IF 1.815
Yuguo Yang,Jing Li,Bing Liu,Yuanyuan Zhang,Xianshun Lv,Lei Wei,Xuping Wang,Jianhua Xu,Huajian Yu,Yanyan Hu,Huadi Zhang,Ling Ma,Jiyang Wang
A series of YAG:Ce 3+ /Eu 3+ , YAG:Ce 3+ /Eu 3+ /Bi 3+ and YAG:Ce 3+ /Gd 3+ phosphors were synthesized by a co-precipitation method. The results suggest that all of phosphors have the cubic phase and nearly spherical morphology. However, the red emission can be produced by codoping Eu 3+ and Eu 3+ /Bi 3+ ions in YAG:Ce 3+ , and the codoped Gd 3+ ions can induce the red-shift of Ce 3+ emission. These results suggest that the Eu 3+ , Eu 3+ /Bi 3+ and Gd 3+ ions can be used to decrease the correlated color temperature and increase the color-rendering index of white light-emitting diodes based on InGaN blue chip and YAG:Ce 3+ phosphors.
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高影响因子
National Science Review
·
2023
·Vol. 10
·期 9
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IF 20.6
Zhou Xiao,Zhao Mei-Huan,Yao Shan-Ming,Dong Hongliang,Wang Yonggang,Chen Bin,Xing Xianran,Li Man-Rong
Chemical stabilization of a high-pressure metastable state is a major challenge for the development of advanced materials. Although chemical pressure (Pchem) can effectively simulate the effect of physical pressure (Pphy), experimental calibration of the pressure passed to local structural motifs, denoted as local chemical pressure (Pchem-Δ) which significantly governs the function of solid materials, remains absent due to the challenge of probing techniques. Here we establish an innovative methodology to experimentally calibrate the Pchem-Δ and build a bridge between Pchem and Pphy via an optical probe strategy. Site-selective Bi3+-traced REVO4 (RE = Y, Gd) is adopted as a prototype to introduce Bi3+ optical probes and on-site sense of the Pchem-Δ experienced by the REO8 motif. The cell compression of RE0.98Bi0.02VO4 under Pphy is chemically simulated by smaller-ion substitution (Sc3+ → RE3+) in RE0.98-xScxBi0.02VO4. The consistent red shift (Δλ) of the emission spectra of Bi3+, which is dominated by locally pressure-induced REO8 dodecahedral variation in RE0.98Bi0.02VO4 (Pphy) and RE0.98-xScxBi0.02VO4 (Pchem-Δ), respectively, is evidence of their similar pressure-dependent local structure evolution. This innovative Δλ-based experimental calibration of Pchem-Δ in the crystal-field dimension portrays the anisotropic transmission of Pchem to the local structure and builds a bridge between Pchem-Δ and Pphy to guide a new perspective for affordable and practical interception of metastable states.
研究领域:
材料科学
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光学
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固态化学
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DOI
高影响因子
Journal of Energy Chemistry
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2023
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IF 13.1
Cheng-Kun Wu,Shuai Zou,Chen-Wei Peng,Si-Wei Gu,Meng-Fei Ni,Yu-Lian Zeng,Hua Sun,Xiao-Hong Zhang,Xiao-Dong Su
The ultraviolet (UV) light stability of silicon heterojunction (SHJ) solar cells should be addressed before large-scale production and applications. Introducing downshifting (DS) nanophosphors on top of solar cells that can convert UV light to visible light may reduce UV-induced degradation (UVID) without sacrificing the power conversion efficiency (PCE). Herein, a novel composite DS nanomaterial composed of YVO 4 :Eu 3+ ,Bi 3+ nanoparticles (NPs) and Ag NPs was synthesized and introduced onto the incident light side of industrial SHJ solar cells to achieve UV shielding. The YVO 4 :Eu 3+ ,Bi 3+ NPs and Ag NPs were synthesized via a sol–gel method and a wet chemical reduction method, respectively. Then, a composite structure of the YVO 4 :Eu 3+ ,Bi 3+ NPs decorated with Ag NPs was synthesized by an ultrasonic method. The emission intensities of the YVO 4 :Eu 3+ ,Bi 3+ nanophosphors were significantly enhanced upon decoration with an appropriate amount of ∼20 nm Ag NPs due to the localized surface plasmon resonance (LSPR) effect. Upon the introduction of LSPR-enhanced downshifting, the SHJ solar cells exhibited an ∼0.54% relative decrease in PCE degradation under UV irradiation with a cumulative dose of 45 kW h compared to their counterparts, suggesting excellent potential for application in UV-light stability enhancement of solar cells or modules.
研究领域:
材料科学
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能源技术
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纳米技术
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DOI
高影响因子
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