CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xingbo Kang,Sihan Feng,Sai Huang,Qi Zhu,Ji-Guang Li
Bi 3+ ion presents strong UV excitation up to ∼430 nm and is almost not excitable by visible light, which makes it valuable in current lighting technologies. Morphologically uniform Sc 1- x VO 4 : x Bi 3+ ( x = 0–0.03, 0.005 interval) and RE 0.99 VO 4 :0.01Bi 3+ (RE = Sc, Lu, Y, Gd, Lu 0.5 Sc 0.5 , Y 0.5 Lu 0.5 , Gd 0.5 Y 0.5 ) micro/nanocrystals were successfully prepared in this work by hydrothermal reaction under 180 °C and pH = 8, without using any chelate or surfactant. The solid-solution vanadates were formed as microrods for Sc and nanocrystals for the other RE owing to different reaction pathways. The optimal Bi 3+ content for luminescence is 1 at% ( x = 0.01) and concentration quenching was analyzed to occur via electric dipole-dipole interaction. The peak wavelength of the excitation/emission band was found to almost linearly increase, accompanied by band broadening, with decreasing cell volume for the series of REVO 4 :0.01Bi 3+ , which was rationalized by considering the energy of metal-to-metal charge transfer (MMCT) and the character of the chemical bond (nephelauxetic effect). Notably, the REVO 4 :0.01Bi 3+ phosphors showed broadband luminescence (FWHM >165 nm) covering almost the entire visible light region in each case, and the center wavelength of emission can be widely and finely tuned from ∼557 to 639 nm by decreasing the size of RE 3+ on demand. Such luminescence performance may allow the micro/nanocrystals to find valuable application in UV-excited white LED lighting and others.
研究领域:
材料科学
·
光学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
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.
研究领域:
材料科学
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光学工程
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DOI
高影响因子
Materials Horizons
·
2023
·Vol. 10
·期 4
·1406-1415
·
IF 13.3
Shiling Jin,Renfu Li,Jiwen Zhu,Tao Pang,Tianmin Wu,Hongbing Zhan,Yuanhui Zheng,Feng Huang,Xueyuan Chen,Daqin Chen
Nonlinear multi-phonon (2–7) absorption in the Na+/Bi3+-alloyed Cs2AgInCl6 lead-free double perovskites with ∼100% photoluminescence quantum yield and superior stability is observed for the first time, which can be pumped by a femtosecond laser in a wide spectral range (800–2600 nm). First-principles calculations verify that the parity-forbidden transition from the valence band maximum and conduction band minimum (at the Γ point) is not broken by Na+/Bi3+ doping, and strong optical band-to-band absorption occurs at the L&X points. Time-resolved emission spectra evidence that single-photon and multi-photon pumping leads to the same self-trapped exciton transition and high-order nonlinear absorption will not induce a remarkable thermal effect. Finally, we demonstrate that the Cs2Na0.4Ag0.6In0.99Bi0.01Cl6 DP shows great potential for next-generation wavelength-selective and highly sensitive multiphoton imaging applications.
研究领域:
材料科学
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光学
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光子学
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纳米技术
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DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Jiawen Wang,Ruoshan Lei,Shilong Zhao,Feifei Huang,Degang Deng,Shiqing Xu,Huanping Wang
Rigorous temperature measurement employed to characterize physic-chemical state has compelled scientists to explore more novel materials for contactless optical thermometry, which must overcome the drawbacks of low sensitivity and poor signal discriminability. Here, a novel dual-mode optical thermometer La 2 ZnTiO 6 : Bi 3+ /Eu 3+ is designed, prepared and characterized via XRD , XPS , EPR, SEM, EDS , PL spectra and decay time. Under 350 nm excitation, the energy transfer process from Bi 3+ to Eu 3+ allows the samples to demonstrate adjustable multi-color emissions. The temperature-dependent emission spectra display that the luminescence intensity of Bi 3+ ions decreases quite faster than that of Eu 3+ ions with temperature, leading to a significant chromaticity shift (∆E = 224 ×10 −3 in 293–473 K) visible to naked eyes. Based on fluorescence intensity ratio of Eu 3+ versus Bi 3+ (FIR = I Eu /I Bi ), the sample shows the maximum relative sensitivity (S r ) of ~1.50% K −1 at 293 K and excellent signal discriminability. Meanwhile, the 5 D 0 → 7 F 2 transition of Eu 3+ ions shows a thermal-responsive lifetime with the optimal S r of 1.23% K −1 at 573 K. This work suggests that the La 2 ZnTiO 6 : Bi 3+ /Eu 3+ double perovskite phosphor has a great potential for dual-mode optical thermometry, being beneficial to obtain precise, sensitive and reliable temperature detection.
研究领域:
材料科学
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光学
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DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 15
·5615-5622
·
IF 5.7
Qianrong Jin,Jinrong Shi,Jianwei Jin,Wenli Xu,Suqin Chen,Yuexiao Pan
Efficient and versatile materials that are both non-toxic and environmentally sustainable have become paramount in our pursuit of greener and more durable illumination solutions. In this study, we investigated the optical properties of rare-earth-based all-inorganic perovskite (AIP) crystal Cs2NaGdCl6 (CNGC) with various substitutions to explore its potential applications in lighting devices. The primitive crystal CNGC exhibits intrinsic blue emission due to its self-trapped excitons (STEs) but singly-doping with Bi3+ ions results in weak blue emission, indicating quenching of the STE emission. Alloying by introducing Ag+ ions into the CNGC:Bi3+ lattice, replacing the Na+ ions, caused the disruption of the crystal field symmetry, which lifts the parity-forbidden selection rule and allows for s–p transitions of the Bi3+ ions. Thus, the co-doping with Ag+ ions in addition to Bi3+ leads to intense broad-band warm white emission covering a wide spectral range of 470–800 nm, with a correlated color temperature (CCT) of 4512 K and a color rendering index (CRI) of 79. The findings from this study provide valuable insights for the development of efficient and high-quality lighting devices using a simple technique.
研究领域:
材料科学
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光学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jiale Zhang,Chengyue Xin,Ming Ma,Wenjun Zhang,Zihan Chen,Ying Gao,Dan Wang
Conventional materials with single emission centers face limitations in emission tunability and anti-counterfeiting security. Thermochromic-induced reversible luminescence modulation offers an effective approach for multi-level optical encryption. In this work, we demonstrate an information‐encryption strategy based on a vacancy-ordered perovskite that undergoes reversible, delayed luminescence shifts. Blue-emitting Bi 3+ -doped Cs 2 ZrCl 6 crystals were synthesized via a facile precipitation method and exhibit dual emission centers under different excitations. Under 365 nm excitation, the Bi 3+ emission at 465 nm undergoes a thermochromic‐induced red shift to 500 nm upon annealing at 110–180 °C; this visibly distinct green state persists for seven days at room temperature and fully reverts to blue over ≈40 days. In contrast, the intrinsic Cs 2 ZrCl 6 self-trapped-exciton emission at 254 nm excitation remains constant, providing an internal reference for enhanced anti-counterfeiting security. Comprehensive photoluminescence and UV–Vis diffuse-reflectance analyses reveal that annealing modulates the band gap via Bi 3+ -induced intermediate states, thereby driving the reversible emission shift without altering crystal structure or oxidation states. By incorporating the Bi 3+ -doped Cs 2 ZrCl 6 powder into conventional screen-printing ink (5:1 mass ratio), we fabricate nearly invisible security patterns that switch from blue to green under 365 nm UV after heating and automatically recover, enabling multi-cycle thermal encryption. This study not only elucidates the band-gap–mediated mechanism of thermochromic luminescence in lead-free perovskites but also establishes a versatile platform for next-generation, reversible optical security and anti-counterfeiting applications.
研究领域:
材料科学
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光学物理
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纳米技术
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固态化学
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信息安全
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yanting Liu,Qiumei Li,Lili Meng,Qi Pang,Yanzhu Wang,Hua Yao,Qian Chen
Currently, lanthanide (Ln 3+ ) doped double perovskites (DPs) suffer from poor controllability of doping and the high concentration quenching phenomenon. Herein, a novel efficient energy transfer (ET) host of Cs 2 NaLuCl 6 Rare-earth-based (RE-based) DPs via Ag + /Bi 3+ co-doping for further Ho 3+ doping is developed. Benefiting from Ag + /Bi 3+ - manipulated the parity of the wavefunction of the self-trapped exciton, intense self-trapped excitons (STEs) broadband warm white visible emission is boosted. Specifically, photoluminescence quantum yield (PLQY) of co-doping with Bi 3+ and Ag + ions in Cs 2 NaLuCl 6 under 350 nm excitation is dramatically promoted to 86.19 % with half maximum (FWHM) of 224 nm. Although the pristine crystal Cs 2 NaLuCl 6 exhibits intrinsic blue emission with FWHM of 75 nm. Furthermore, the ET channel from STEs to Ho 3+ was constructed by tri-doping Ho 3+ , and the effective red and near-infrared (NIR) emission of Ho 3+ was obtained. Finally, NIR light-emitting diodes (LEDs) and white LED based on Ho 3+ doped/undoped Cs 2 Na 0.8 Ag 0.2 Lu 0.98 Bi 0.02 Cl 6 DPs were prepared with different application features. Specifically, white LEDs showed higher color rendering index and lower associated color temperature, while NIR LEDs showed good night vision imaging. This work provides a new strategy for the design of an ET host suitable for Ln 3+ doping, avoiding the effects of the concentration quenching phenomenon that always occurs in heavily doped hosts and realizing controllable doping.
研究领域:
材料科学
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光学工程
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DOI
高影响因子
Materials Today Chemistry
·
2025
·
IF 6.7
Jiahui Lei,Rongfei Wei,Siyu Guo,Xiangling Tian,Fangfang Hu,Hai Guo
Traditional optical anti-counterfeiting materials suffer from the static and simplistic optical responses, rendering them vulnerable to replication and constraining practical utility. Addressing these challenges, the strategic design of multifunctional materials with tunable and dynamic optical properties offers a promising route to advanced, reliable, resilient anti-counterfeiting and rewritable information storage technologies. Herein, we report Bi 3+ and Er 3+ co-doped CaLuGaO 4 phosphor exhibiting multicolor luminescence, afterglow, and reversible photochromism. Emission color is tunable between blue and cyan by altering ultraviolet excitation wavelength or temperature, while up-conversion luminescence shifts from yellow-green to green with increased 980 nm excitation power or reduced irradiation distance. Additionally, Bi 3+ doping induces defect-associated blue afterglow and photochromic switching under 254 nm light, reversible by heat treatment or 395 nm light irradiation. These multifunctional features enable sophisticated anti-counterfeiting and encoded information storage, positioning CaLuGaO 4 :Bi 3+ ,Er 3+ as a next-generation smart optical material.
研究领域:
材料科学
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光学工程
·
固态物理学
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信息存储技术
·
光子学
✓ 已验证
产品关联
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
·
光电
·
光子学
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产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2021
·
IF 5.165
Ruxin Liu,Wenjun Zhang,Wenjing Liu,Guojing Li
Lead-free perovskites have been widely studied due to their environmental friendliness and high stability. In this study, Bi3+-doped Cs2HfCl6 has been synthesized at room temperature. Different from the emission of the Cs2HfCl6 host (452 nm), Bi3+:Cs2HfCl6 can produce a bright blue emission at an excitation wavelength of 350 nm, which is derived from the 3P1 → 1S0 transition of Bi ions and accompanied by the properties of self-trapped excitons. Moreover, 7%Bi3+:Cs2HfCl6 shows excellent stability with the photoluminescence quantum yield reaching up to 69.08%. Meanwhile, a light-emitting diode that is close to pure white light has been fabricated by using 7%Bi3+:Cs2HfCl6, which has a high color rendering index of 92.5. These results show that Bi3+:Cs2HfCl6 would be a potential candidate in the field of inorganic luminescent materials.
研究领域:
材料科学
·
光电
·
光子学
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产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 26
·51467-51475
·
IF 5.6
Wenjie Wang,Jianyan Ding,Quansheng Wu
In recent years, multi-mode fluorescent anti-counterfeiting technology has been regarded as a promising replacement for traditional single-fluorescent-pattern-based methods in ensuring information security. This advancement necessitates phosphors with multi-mode photoluminescent properties. In contrast to the conventional complex approach involving the integration of downshifting and upconversion phosphors, this study demonstrates the achievement of multiple visible-light emissions in Bi 3+ -activated scandium silicate NaSrScSi 2 O 7 , which exhibits sensitivity to near-ultraviolet light. Under the excitation at 370 nm, Bi 3+ -activated NaSrScSi 2 O 7 emits a narrow-band blue light, yet it can emit a broad-band cyan light under the excitation at 340 nm. The significant photoluminescence property of Bi 3+ ion is proved to originate from special crystal structure of NaSrScSi 2 O 7 , which provides multiple crystallographic sites for accommodating Bi 3+ ion. Benefiting from the characteristic of NaSrScSi 2 O 7 , the sample performs excellent thermal and chemical stability. A warm WLED device has been fabricated by using as-prepared sample. Finally, a pattern produced by Bi 3+ -activated NaSrScSi 2 O 7 is proved to emit distinguishing visible light under the common 365 nm and 340 nm near-ultraviolet lamp, which is considered to pave a simple approach for realizing high-level fluorescent anti-counterfeiting technology.
研究领域:
材料科学
·
光学材料
·
固态化学
·
发光学
·
防伪技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 12
·11419-11428
·
IF 2.195
Zhao Caiyue,Xu Yudong,Wang Lei,Chen Xinyi,Hu Wenjie,Dai Zhaoxiang,Hu Mengyuan,Liu Kai,Shi Min
In this study, Bi 3+ and Mn 4+ co-doped CaAl 12 O 19 phosphors were prepared via high-temperature solid-state reaction method, and their crystal structure, particle morphologies, luminescence properties, charge compensation mechanism and crystal field effect were investigated in detail. A most remarkable tuning effect can be achieved when the Bi 3+ concentration is 5% in CaAl 12 O 19 :Bi 3+ , 0.05% Mn 4+ and the electric multipolar interaction is inferred to be the main mechanism for concentration quenching effect. It is also found that, as charge compensators rather than sensitizers, Bi 3+ ions can effectively tailor the emissions in a wide range through partial reducing Mn 4+ to Mn 2+ . The charge compensation physics presumably involves the shift of Fermi energy level ( E F ) and variations of valence states of manganese ions after Bi 3+ introduction. Moreover, the authors calculated the splitting energy (Δ) and Racah parameters ( B and C ) for Mn 4+ in octahedral sites and Mn 2+ in tetrahedral sites by combining excitation spectra with Tanabe-Sugano diagram. The experimental results will be of certain helpfulness in developing phosphors used in white LED.
研究领域:
材料科学
·
光学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）