JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2020
·Vol. 103
·期 5
·3273-3285
·
IF 3.502
Dayu Huang,Yi Wei,Peipei Dang,Xiao Xiao,Hongzhou Lian,Jun Lin
LaScO 3 : x Bi 3+ , y Tb 3+ , z Eu 3+ ( x = 0 − 0.04, y = 0 − 0.05, z = 0 − 0.05) phosphors were prepared via high-temperature solid-state reaction. Phase identification and crystal structures of the LaScO 3 : x Bi 3+ , y Tb 3+ , z Eu 3+ phosphors were investigated by X-ray diffraction (XRD). Crystal structure of phosphors was analyzed by Rietveld refinement and transmission electron microscopy (TEM). The luminescent performance of these trichromatic phosphors is investigated by diffuse reflection spectra and photoluminescence. The phenomenon of energy transfer from Bi 3+ and Tb 3+ to Eu 3+ in LaScO 3 : x Bi 3+ , y Tb 3+ , z Eu 3+ phosphors was investigated. By changing the ratio of x , y , and z , trichromatic can be obtained in the LaScO 3 host, including red, green, and blue emission with peak centered at 613, 544, and 428 nm, respectively. Therefore, two kinds of white light-emitting phosphors were obtained, LaScO 3 :0.02Bi 3+ ,0.05Tb 3+ , z Eu 3+ and LaScO 3 :0.02Bi 3+ ,0.03Eu 3+ , y Tb 3+ . The energy transfer was characterized by decay times of the LaScO 3 : x Bi 3+ , y Tb 3+ , z Eu 3+ phosphors. Moreover absolute internal QY and CIE chromatic coordinates are shown. The potential optical thermometry application of LaScO 3 :Bi 3+ ,Eu 3+ was based on the temperature sensitivity of the fluorescence intensity ratio (FIR). The maximum S a and S r are 0.118 K −1 (at 473.15 K) and 0.795% K −1 (at 448.15 K), respectively. Hence, the LaScO 3 :Bi 3+ ,Eu 3+ phosphor is a good material for optical temperature sensing.
研究领域:
材料科学
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发光材料
·
光学物理
·
固态化学
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传感器技术
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Yuhui Zheng,Jiansheng Huo,Jinglian Yang,Jing Hu,Jinwei Gao,Qianming Wang
Uniform and dispersive NaLa(MoO 4 ) 2-x (WO 4 ) x (abbreviated as NLMW): Eu 3+ /Tb 3+ (5 mol%) microspheres were successfully synthesized at low temperature (393 K). The incorporation of Bi 3+ or Mn 2+ into CaMoO 4 : Eu 3+ with tetragonal crystalline phase has also been studied. The structure, morphology, and luminescent properties of these powder samples were examined by means of X-ray diffraction (abbreviated as XRD), scanning electron microscopy (abbreviated as SEM), and fluorescent spectrophotometry, respectively. SEM images substantiated that these phosphors have uniform sphere-shaped morphologies. The samples exhibited the characteristic emission of Eu 3+ ( 5 D 0 → 7 F J )/Tb 3+ ( 5 D 4 → 7 F J ) under ultraviolet excitation. Effects of the ratio of MoO 4 /WO 4 on the luminescence behavior were investigated in detail. The MoO 4 /WO 4 ratio was optimized as 1/1. The international commission on illumination (abbreviated CIE for its French name) chromaticity coordinates of NLMW: Eu 3+ and NLMW: Tb 3+ indicate the emissions were located in the red and green region, which will be beneficial for the potential device fabrication . Encapsulation of Bi 3+ and Mn 2+ both can effectively sensitize europium (III) ions, generating stronger red emissions ( 5 D 0 → 7 F J ).
研究领域:
材料科学
·
光学
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DOI
高影响因子
Light-Science & Applications
·
2019
·Vol. 8
·期 1
·1-9
·
IF 14
Wei Yi,Xing Gongcheng,Liu Kang,Li Guogang,Dang Peipei,Liang Sisi,Liu Min,Cheng Ziyong,Jin Dayong,Lin Jun
Phosphor-converted white-light-emitting diodes (pc-WLED) have been extensively employed as solid-state lighting sources, which have a very important role in people’s daily lives. However, due to the scarcity of the red component, it is difficult to realize warm white light efficiently. Hence, red-emitting phosphors are urgently required for improving the illumination quality. In this work, we develop a novel orangish-red La 4 GeO 8 :Bi 3+ phosphor, the emission peak of which is located at 600 nm under near-ultraviolet (n-UV) light excitation. The full width at half maximum (fwhm) is 103 nm, the internal quantum efficiency (IQE) exceeds 88%, and the external quantum efficiency (EQE) is 69%. According to Rietveld refinement analysis and density functional theory (DFT) calculations, Bi 3+ ions randomly occupy all La sites in orthorhombic La 4 GeO 8 . Importantly, the oxygen-vacancy-induced electronic localization around the Bi 3+ ions is the main reason for the highly efficient orangish-red luminescence. These results provide a new perspective and insight from the local electron structure for designing inorganic phosphor materials that realize the unique luminescence performance of Bi 3+ ions.
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
FUEL
·
2023
·
IF 7.4
Xiushuai Guan,Shanbiao Jin,Le Liu,Xiya Zhao,Xiaochao Zhang,Changming Zhang,Zhong Li,Caimei Fan
The utilization of oxygen vacancies to modulate the surface properties of catalysts is a powerful way to enhance catalytic activity. In this work, the doping effect of Bi 3+ on the performance of CeO 2−δ (Ce x Bi 1−x O 2−δ ) hybrid nanorods with rich oxygen vacancies for the photo-thermal synthesis of dimethyl carbonate (DMC) from CO 2 /CH 3 OH (140 ℃, 1.6 MPa, 4 h) is systematically investigated. It is found that Ce 0.9 Bi 0.1 O 2−δ exhibits the best catalytic performance, achieving a photo-thermal yield of 3.13 mmol∙g −1 without any dehydrating agent (1.14 times compared to thermal catalysis). It turns out that regulating the concentration of Bi 3+ ions not only modifies the oxygen vacancy content, but also improves the light harvesting efficiency. Moreover, a series of characterization techniques, such as X-ray photoelectron spectroscopy, Raman spectrometer and electron paramagnetic resonance are employed to analyze and verify that the asymmetric oxygen vacancies are conducive to the improvement in the CO 2 adsorption-activation. Finally, a possible reaction mechanism model of Bi 3+ doping on CeO 2−δ for the photo-thermal synthesis of DMC from CO 2 and CH 3 OH is proposed. This work provides a practical approach to catalyst surface engineering design.
研究领域:
材料科学
·
催化化学
·
环境科学
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2020
·Vol. 103
·期 12
·6922-6931
·
IF 3.502
Puxian Xiong,Chibin Zheng,Mingying Peng,Zhihao Zhou,Feifei Xu,Kexin Qin,Yiyu Hong,Zhijun Ma
Till now, many doped persistent luminescence (PersL) phosphors have been investigated and found various applications in such as bioimaging, photocatalysis and information storage, but introducing PersL emitters into a proper host is mostly complex. In this research, a self-activated PersL phosphor Ba 2 Zr 2 Si 3 O 12 (BZSO) is prepared by solid state reaction. By adding NH 4 Cl, the self-activated PersL intensity is evidently enhanced. The trap depths and concentrations are examined by thermoluminescence spectra. Meanwhile, Bi 3+ ions are introduced into BZSO and show wide band photoluminescence (PL) from 300 to 600 nm. Moreover, the PL of Bi 3+ is tunable under excitation by 265-350 nm lights. Furthermore, as a proof-of-concept design, we designed a patterned quick response (QR) code based on the self-activated PersL of BZSO, and the information of “South China University of Technology (SCUT)” can be read out by the code scanning technology. Bi 3+ -doped BZSO phosphors are suggested to provide potential applications in information storage by its self-activated PersL, and to excite researchers to study the tunable PL in Bi 3+ -doped phosphor.
研究领域:
材料科学
·
光学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2026
·Vol. 37
·期 18
·1407
·
IF 3.2
Jiang Zheng,Yang Xiaoliang,Xiao Siguo
Cr 3+ /Bi 3+ co-doped and Cr 3+ /Yb 3+ co-doped La 2 LiSbO 6 phosphors have been synthesized via a high-temperature solid-state method, respectively. La 2 LiSbO 6 : Cr 3+ gives a broadband emission peaking at 855 nm under 671 nm excitation. Partial substitution of La 3 ⁺ ions by Bi 3+ ions induces lattice distortion in the La 2 LiSbO 6 host and weakens the crystal field strength of Cr 3+ , leading to the red shift of Cr 3+ emission. The Cr 3+ emission peak shifts from 855 to 900 nm with Bi 3+ concentration increasing from 0 to 0.07 mol %. The increased lattice distortion also improves the local environment of Cr 3+ , thereby resulting in a threefold increase in luminescence intensity and a 25.8% increase in quantum yield. When the Yb 3+ ions are introduced, the emission peak can be further tuned from 855 to 1000 nm directly, induced by energy transfer from Cr 3+ to Yb 3+ ions. It is proven that quadrupole–quadrupole interaction is responsible for the energy transfer from Cr 3+ to Yb 3+ in the La 2 LiSbO 6 host. Moreover, the introduced Yb 3+ also largely improves the thermal stability of the phosphor. The work might provide meaningful reference for the design and development of highly efficient Cr 3+ -doped luminescent materials.
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Li Chen,Fangyin Zhu,Junwen Yu,Wenqian Zhou,Nanjia Lai,Xiaohui Li,MeiLing Chen,Weicheng Zheng,Zhengye Xiong,Jingyuan Guo
Double perovskite-type fluorescent materials Ba 2 GdWO 6 : x %Bi 3+ ( x = 0.1∼2.0) were successfully prepared via a high-temperature solid-state reaction method, which possesses dual functional characteristics of photoluminescence (PL) and thermoluminescence (TL). Systematic characterizations revealed that when the Bi 3+ doping amount is 1%, the sample exhibits optimal PL performance under near-ultraviolet excitation. At an excitation wavelength of 382 nm, the typical blue emission peak of Bi 3+ shows a quantum efficiency of 51.14%, with CIE chromaticity coordinates of (0.155, 0.049), a color purity as high as 91.62%, a correlated color temperature (CCT) of 1721 K, and an activation energy of 0.228 eV. All these indicators meet the application standards of LED phosphors for plant growth.Thermoluminescence analysis indicated that the material exhibits an obvious TL peak around 390 K, and the optimal TL performance is achieved when the Bi 3+ doping concentration is 0.2%. Within the irradiation dose range of 0.266∼2.1 Gy, the TL intensity shows a good linear relationship with the dose, demonstrating its applicability for low-dose radiation detection. In addition, the samples after X-ray irradiation not only possess high linear responsiveness but also exhibit excellent thermal stability and radiation damage resistance.In summary, the double perovskite tungstate Ba 2 GdWO 6 : x %Bi 3+ achieves the synergistic optimization of light conversion and radiation response, and has important application value in the fields of plant lighting LEDs and radiation dose monitoring.
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高影响因子
Laser & Photonics Reviews
·
2026
·
IF 9.7
Yan Xiang,Zhixiong Xu,Tongcheng Wei,Miaomiao Ma,Nan Yang,Pengpeng Dai,Meng Zhang,Xintong Zhang
Wide-temperature color-stable luminescence is a critical requirement for high-performance phosphor-converted light-emitting diodes (pc-LEDs). However, broadband emitters, particularly Bi 3+ -activated phosphors, universally suffer from thermally induced spectral drift. This behavior originates from their intrinsic sensitivity to temperature-dependent crystal-field reconfiguration and electron–phonon coupling (EPC) under thermal cycling conditions. To overcome the above bottleneck, we propose a lattice engineering strategy grounded in an intrinsically low-thermal-expansion host, using Gd 2 Zr 2 O 7 (GZO) as a model system. Benefiting from its ultralow coefficient of thermal expansion (6.56 × 10 −6 K −1 ), the GZO host robustly suppresses lattice distortion and markedly attenuates EPC effects over an ultra-wide temperature range (6–423 K). Such unique structural characteristics decouple Bi 3+ emission from thermally driven lattice dynamics, endowing the phosphor with intrinsic thermal spectral stability. The optimized composition, Gd 2 Zr 2 O 7 : 0.03Bi 3+ , demonstrates outstanding chromatic stability across the entire temperature range, with negligible average CIE coordinate deviations of Δ Δ $\Delta $ x = 0.00987 and Δ Δ $\Delta $ y = 0.01205. Furthermore, it exhibits unique excitation- and temperature-responsive luminescence, enabling flexible dual-mode spectral modulation. This study transforms the design route of wide-temperature color-stable phosphors from passive external heat dissipation to active intrinsic low-expansion host engineering and provides a general strategy for exploiting anti-color-drift broadband luminescent materials.
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高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Xiaolei Zhu,Xiaoping Wang,Xianke Sun
Bi 3+ /Tb 3+ /Mn 2+ -activated SrZnSO phosphors were prepared to investigate their luminescence characteristics. The SrZnSO:Bi 3+ , SrZnSO:Mn 2+ and SrZnSO:Tb 3+ phosphors, excited by the NUV/blue light, show blue, orange and green emissions, respectively. The Bi 3+ → Tb 3+ , Tb 3+ → Mn 2+ and Bi 3+ → Mn 2+ energy transfer processes take place in Bi 3+ /Tb 3+ -, Tb 3+ /Mn 2+ -, Bi 3+ /Mn 2+ - and Bi 3+ /Tb 3+ /Mn 2+ -activated SrZnSO phosphors, which result in tunable luminescence of these phosphors. The CIE coordinates were calculated on the basis of the emission spectra, and they reflect the emission color changes of phosphors. For the Bi 3+ /Tb 3+ -, Tb 3+ /Mn 2+ - and Bi 3+ /Mn 2+ - activated SrZnSO phosphors, the emission points are located in the cyan, yellow and white light regions, respectively. For the Bi 3+ /Tb 3+ /Mn 2+ -activated SrZnSO phosphors, the light is in warm white light region.
研究领域:
材料科学
·
光学
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产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2021
·
IF 5.165
Quwei Ni,Zhibin Mei,Chunxia Li,Jieying Li,Jiachun Liu,Wanqiang Liu,Jiansheng Huo,Qianming Wang
The influence of temperature on a variety of physiological or chemical processes has generated considerable interest, and recently noninvasive lanthanide-incorporated optical thermometers have been considered as promising candidates for monitoring its changes at different scales. Herein, a novel Bi3+-activated Sr3–xGdxGaO4+xF1–x phosphor with tunable color has been constructed by a cooperative cation–anion substitution strategy with to the replacement of [Sr2+–F–] by [Gd3+–O2–]. When x = 0, the sample Sr3GaO4F/Bi3+ possesses a peak wavelength at 438 nm, and this value will shift to 470 nm if x is equal to 1 (Sr2GdGaO5/Bi3+). In addition, photoluminescence tuning from blue to red has been realized successfully by an efficient Bi3+ → Eu3+ energy migration model in Sr2.6Gd0.4GaO4.4F0.6 samples. The specific Bi3+ → Eu3+ energy transfer has been explained by dipole–dipole interactions derived from a model of the Dexter pathway. Intriguingly, the two dopants (a blue signal from Bi3+ and a red signal from Eu3+) possess different thermal responses to increasing temperature. Accordingly, the intensity ratio values are sensitive to the temperature changes. The energy level cross relaxation causes the quenching effect of Bi3+, and the multi-phonon de-excitation mode leads to the thermal quenching of Eu3+. At room temperature (298 K), the determined maximum relative sensitivity (Sr) is 1.27% K–1. Moreover, the absolute sensitivity (Sa) is 0.067 K–1 since the temperature is elevated to 523 K. The collected results are superior to most of the reported optical thermometry materials.
研究领域:
材料科学
·
光学
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
ADVANCED MATERIALS
·
2024
·Vol. 36
·期 48
·2412099
·
IF 27.4
Hongzhi Zhang,Hong Li,Junpeng Li,Conglin Liu,Hongming Jiang,Yuxin Liu,Rui Wang,Jiyang Xie,Wanbiao Hu,Jing Zhu
Achieving single-phase full-spectrum white light (SFWL) phosphors is a central goal in the optical field because they simplify white-LEDs assembly and avoid long-term color instability. Despite many approaches are developed, current SFWL phosphors still suffer from chromaticity drift due to inconsistent thermal quenching of multiple emitting centers. Herein, an absolutely structural disorder strategy is established to develop a single-emitting center-based SFWL phosphor. Precisely controlling the flux added induces a structural translation from the absolutely ordered Y 0.75 Ta 0.25 O 1.75 :Bi 3+ to the absolutely disordered Y 0.785 Ta 0.215 O 1.715 :Bi 3+ , as directly identified by STEM-HAADF analyses. Structural disorder enables Y 0.785 Ta 0.215 O 1.715 :Bi 3+ to produce SFWL with the FWHM of 6194 cm −1 (175 nm) by employing a single activator site, a 1352 cm −1 increase compared to the cyan-emitting Y 0.75 Ta 0.25 O 1.75 :Bi 3+ despite Bi 3+ occupies two lattice positions. This single-emitting center-based SFWL, coupled with minimal thermal expansion of the unit cell and inapparent spectral overlap of excitation and emission bands, ensure zero-chromaticity shift with elevated temperature. A prototype white-LEDs using Y 0.785 Ta 0.215 O 1.715 :Bi 3+ as a single luminescent layer generates warm white light without perceptible CIE coordinates shift under various currents or after extremely long-term continuous operation. This work highlights the potential of structural disorder in designing SFWL phosphors with exceptional color stability.
研究领域:
光学材料
·
发光学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Lili Liu,Haijie Guo,Lei Wang,Qiufeng Shi,Jianwei Qiao,Cai’e Cui,Ping Huang
Ultraviolet-A persistent luminescence (UVA PersL) materials have attracted considerable attention due to their extensive potential in applications such as photodynamic therapy, photocatalysis, and sterilization. Herein, we report a novel UVA PersL phosphor Y 3 Ga 3 MgSiO 12 :Bi 3+ (YGMSO:Bi 3+ ) with continuous photocatalytic capabilities. The PersL duration of the YGMSO:0.005Bi 3+ sample can exceed 8 h after excitation with 254 nm UV light, and the UVA PersL emission peak is located at 324 nm. Specifically, we investigated the distribution and depth of traps using thermoluminescence curves and further demonstrated that oxygen vacancy is the main defect type responsible for producing PersL by X-ray photoelectron spectroscopy. On this basis, the PersL mechanism of YGMSO:Bi 3+ is established. Furthermore, considering that the UVA PersL spectrum of YGMSO:Bi 3+ aligns with the absorption band of TiO 2 , we synthesized YGMSO:Bi 3+ /TiO 2 composite for methylene blue degradation experiments. The experimental results indicate that the material can serve as a continuous excitation source for TiO 2 , facilitating its application in continuous photocatalysis. Overall, the developed UVA PersL material YGMSO:Bi 3+ offers valuable insights for the design of UVA light sources for photocatalytic applications.
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高影响因子
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