CHEMICAL PHYSICS LETTERS
·
2020
·
IF 2.029
Xiaoya Bu,Yan-gai Liu,Baochen Wang,Ruiyu Mi,Ziyao Wang,Zhaohui Huang
The Eu 2+ activated Ca 8 ZnGd(PO 4 ) 7 :Eu 2+ green light emitting phosphors and Eu 2+ /Mn 2+ co-doped tunable light emitting phosphors Ca 8 ZnGd(PO 4 ) 7 :Eu 2+ ,Mn 2+ were successfully synthesized via the solid-state reaction method. The X-ray powder diffraction measurements and Rietveld refinement were used to assess the phase composite and crystal structure. The photoluminescence properties, diffuse reflection spectrum, chromaticity coordinates and fluorescence decay curves of the samples were investigated. It has been confirmed that the resonant type Eu 2+ →Mn 2+ energy transfer occurs via a dipole-quadrupole interaction. With various Eu 2+ /Mn 2+ molar ratios, the spectrum-tunable phosphors are obtained from green (0.183, 0.335) to white (0.297, 0.298).
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Light-Science & Applications
·
2021
·Vol. 10
·期 1
·1-8
·
IF 17.782
Mao Yuanhao,Zhao Dong,Yan Shen,Zhang Hongjia,Li Juan,Han Kai,Xu Xiaojun,Guo Chuan,Yang Lexian,Zhang Chaofan,Huang Kun,Chen Yulin
Vacuum ultraviolet (VUV) lasers have demonstrated great potential as the light source for various spectroscopies, which, if they can be focused into a small beam spot, will not only allow investigation of mesoscopic materials and structures but also find application in the manufacture of nano-objects with excellent precision. In this work, we report the construction of a 177 nm VUV laser that can achieve a record-small (~0.76 μm) focal spot at a long focal length (~45 mm) by using a flat lens without spherical aberration. The size of the beam spot of this VUV laser was tested using a metal grating and exfoliated graphene flakes, and we demonstrated its application in a fluorescence spectroscopy study on pure and Tm 3+ -doped NaYF 4 microcrystals, revealing a new emission band that cannot be observed in the traditional up-conversion process. In addition, this laser system would be an ideal light source for spatially and angle-resolved photoemission spectroscopy.
研究领域:
物理学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2019
·
IF 4.175
Kangxu Zhao,Xuan Zheng,Huijun Zhang,Menghan Xu,Shan Wang,Quanling Yang,Chuanxi Xiong
Carbon dots (CDs) have been applied in numerous fields by virtue of their excellent features. Multi-color fluorescent carbon dots with high photoluminescence (PL) quantum yield are still the emphases for research. Here, by using 3,5-diaminobenzoic acid and 3,4-diaminobenzoic acid, multi-color-red, green, blue (RGB) emitting CDs (RGB-CDs) were successfully synthesized via a one-pot solvothermal route. The RGB-CDs exhibited stable optical properties and significant photoluminescence characteristics with excitation-independent. Structure and element analysis indicated that conjugated graphite structure of carbon cores and oxygen on surface states were responsible for the RGB color emissions of carbon dots. Moreover, RGB-color and white light-emitting diodes (LEDs) were fabricated by these multi-color fluorescent carbon dots. The LEDs exhibited excellent lighting performance, indicating that these RGB-CDs have the potential to substitute rare elements for solid-state optoelectronic applications .
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
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Yuqin Guo,Guojuan Wang,Linrong Qiu,Chengwu Hong,Shuxing Li,Rong-Jun Xie
Using blue lasers to excite green-emitting phosphors offers a compelling solution to address the “green gap” issue, providing a high-brightness green light source for underwater wireless optical communication (UWOC). However, current green-emitting phosphors show poor light conversion efficiencies or inadequate luminance saturation thresholds, impeding the development of brighter green light sources. Herein, the porous Lu 3 Al 5 O 12 :Ce phosphor ceramics are designed, which shows no change in quantum efficiency (82%) even after 6000 h of extended aging. This design results in a substantial improvement in light conversion efficiency (61.6%), luminous efficacy (286 lm·W⁻¹), and an exceptional luminance saturation threshold of 33 W·mm⁻ 2 , culminating in a maximum green light flux of 4720 lm. Moreover, the high-directionality green light source device has been fabricated that achieves an illuminance of 6081 lx at a distance of 10 meters (15.0 W blue laser irradiation) with the electro-optical conversion efficiency up to 26.3%, much higher than that using green laser directly (usually <20%). This setup enables long-range underwater transmission of 65.3 meters with a peak data rate of 3.45 MHz, opening up new avenues for innovative advancements in UWOC technology.
研究领域:
光学通信
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光子学
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材料科学
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固态照明
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水下技术
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激光技术
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通信工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Lei Fu,Di Wu,Yanfei Xiao,Wanfang Zou,Jinfen Kuang,Yan Liang,Fu Du,Jiaqing Peng,Xinyu Ye
Blue phosphor Sr 5−x-y R y (PO 4 ) 3 Cl:xEu 2+ (R = La, Gd, Lu) was prepared via solid-state reaction process, in which R 3+ replaces part of Sr 2+ ions in the matrix to benefit Eu 2+ luminescence. The change of Eu 2+ /Eu 3+ values were studied by XPS , and the results shown that the incorporation of R 3+ in the matrix resulted in the values increase of Eu 2+ /Eu 3+ . And substitute R 3+ non-equivalently for Sr 2+ , the modified Sr 5−x-y R y (PO 4 ) 3 Cl:xEu 2+ phosphors show better luminescence intensity and thermal stability. The emission intensity of Sr 4.72 Lu 0.2 (PO 4 ) 3 Cl:0.08Eu 2+ is 1.97 times of Sr 4.95 (PO 4 ) 3 Cl:0.05Eu 2+ . Moreover, the thermal quenching of Eu 2+ photoluminescence could be reduced. Compared to the commercial BAM:Eu 2+ phosphor, the stabilities of all Sr 4.72 R 0.2 (PO 4 ) 3 Cl:0.08Eu 2+ (R=La 3+ , Gd 3+ and Lu 3+ ) phosphors are better than that of BAM:Eu 2+ at the temperatures below 100 °C. The luminescent intensity of Sr 4.72 Lu 0.2 (PO 4 ) 3 Cl:0.08Eu 2+ maintains 95% while BAM:Eu 2+ is only 88% of the initial intensity at 150 °C. By combining Sr 4.72 Lu 0.2 (PO 4 ) 3 Cl:0.08Eu 2+ , Y 3 (Al,Ga) 5 O 12 :Ce 3+ and CaAlSiN 3 :Eu 2+ with 400 nm near-ultraviolet LED chip, a white-light-emitting diode was obtained. The fabricated WLED device with CIE color coordinates x = 0.3896, y = 0.3788, low CCT (3775 K) and high Ra (95.1), has enormous potential application in full-spectrum lighting field.
研究领域:
材料科学
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光学工程
✓ 已验证
DOI
高影响因子
SOLID STATE SCIENCES
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2018
·
IF 1.861
Jie Lu,Linjiang Shen
Recently, developing free rare-earth (RE) doped afterglow phosphors has received great attentions in the lighting field. In this work, we prepare and report a RE-free phosphor, Na 2 BeGeO 4 :Mn 2+ , which can simultaneously emit the green fluorescence and afterglow luminescence upon excitation at UV light. Our results reveal that the as-prepared samples crystallize in orthorhombic type with the space group of Pmn 2 1 (31). The green emission is a broad band centered at 525 nm, corresponds to the 4 T 1 ( 4 G)- 6 A 1 ( 6 S) transition of Mn 2+ ions. After exposing to a 254 nm UV lamp for 10 min, the green afterglow luminescence seen with naked eyes can last more than 5 h. Together with the structural analysis and thermoluminescence (TL) spectra, the afterglow luminescence mechanism is also discussed in this work.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2023
·Vol. 11
·期 20
·2300623
·
IF 9
Zhihao Wang,Bohan Wang,Xiping Zeng,Dengfeng Peng,Yu Wang
Current luminescence materials are abundantly available for visualization fields on a theoretical level, while the lack of luminescent intensity has largely hindered their practical application. Here, the substantial enhancement of the multimode luminescence is demonstrated including mechanoluminescence (ML), photoluminescence (PL), and X-ray excited optical luminescence (XEOL) for Mn 2+ and Tb 3+ in zinc calcium oxysulfide (CaZnOS) by increasing the concentration of oxygen vacancies (OVs). Through a comprehensive structure analysis, it is found that the CaZnOS lattice has a tolerance of 60% of Sr 2+ with respect to Ca 2+ in the methodology. The experimental characterizations verified that the lattice distortion of CaZnOS originating from Sr 2+ incorporation can efficiently promote the elimination of oxygen elements and simultaneously produce more OVs in the matrix, which can effectively fortify the trapped electrons and ultimately promote stronger luminescence. The ML, PL, and XEOL achieve around two to six times’ enhancement after Sr 2+ incorporation. The findings provide insight into mechanisms underlying the luminescence behavior change of phosphors after cation substitution and may have wide implications for the practical application of intrinsically defective phosphors.
研究领域:
材料科学
·
发光材料
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产品关联
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2025
·
IF 4.7
Guangqin Ren,Ruoyi Li,Rui Li,Jian Zhang,Haina Bai,Xinyan Wang
In this study, a photoelectrocatalytic treatment technology based on stabilized supported photoelectrodes (NiF/FCN/BMO) constructed from Z -scheme Fe-g-C 3 N 4 /Bi 2 MoO 6 (Fe 3 CN/BMO-3) photocatalysts and nickel foam (NiF) is proposed for the treatment of difficult-to-degrade waste leachate. Efficient degradation of waste leachate was achieved through the synergistic action of photocatalysis and electrocatalysis. The photoelectrocatalytic process significantly promoted the separation of photogenerated electron-hole pairs and accelerated the migration rate of photogenerated carriers in the presence of an applied electric field. Three-dimensional fluorescence spectroscopy (3D EEMs) was used to analyze the changes in fluorescence intensity of the difficult-to-degrade substances during the degradation process, confirming that humic acid-like substances were effectively removed. Meanwhile, the results of UV–vis spectroscopy showed that the content of UV-absorbing groups, such as conjugated unsaturated bonds and aromatic structures, was significantly reduced in the waste leachate. Further, two-dimensional correlation spectroscopy (2DCOS) was utilized to deeply explore the dynamic changes of substances during the degradation process. The economic performance evaluation showed that the final cost of this photoelectrocatalytic technology for the degradation of waste leachate was 0.40 USD/m 3 , which has significant economic benefits. This study aims to develop a biological pretreatment process that converts recalcitrant organic matter into biodegradable small molecules, providing a new approach for the graded treatment of highly stable organic wastewater
研究领域:
环境科学
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催化
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废水处理
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光谱学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2021
·
IF 5.221
Chen Lujia,Chen Meijuan,Zhou Yuping,Ye Changsheng,Liu Ruiyuan
Preparation of near-infrared (NIR) emissive fluorophore for imaging-guided PDT (photodynamic therapy) has attracted enormous attention. Hence, NIR photosensitizers of two-photon (TP) fluorescent imaging and photodynamic therapy are highly desirable. In this contribution, a novel D-π-A structured NIR photosensitizer (TTRE) is synthesized. TTRE demonstrates near-infrared (NIR) emission, good biocompatibility, and superior photostability, which can act as TP fluorescent agent for clear visualization of cells and vascular in tissue with deep-tissue penetration. The PDT efficacy of TTRE as photosensitizer is exploited in vitro and in vivo. All these results confirm that TTRE would serve as potential platform for TP fluorescence imaging and imaging-guided photodynamic therapy.
研究领域:
生物医学工程
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分子影像
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诊疗学
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癌症研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Communications Physics
·
2023
·Vol. 6
·期 1
·1-10
·
IF 5.5
Li Daguang,Cui Hao,Qin Guanshi,Qin Weiping
An ideal blackbody absorbs all light impinging on it, and it radiates electromagnetic waves with a broad spectrum that depends only on the temperature. Conversely, a white object is characterized by a finite reflectance to visible light, hence being the opposite of a blackbody. Challenging this concept, here we find that various substances exhibit strong optical absorption capabilities like blackbodies when exposed to intense light, despite appearing pure white in the sunlight. We name this phenomenon photoinduced blackbody effect. Under near infrared light, the photoinduced blackbody effect is accompanied by photon avalanche optical frequency conversion and optical bistable luminescence. Namely, the energy states and absorption properties of the samples are modified under strong laser irradiation. The modified absorption transitions cause the switch of the sample from a quasi-whitebody into a quasi-blackbody via an avalanche mechanism. At the same time, the sample emits a broadband electromagnetic radiation, becoming a bright blackbody.
研究领域:
物理学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2019
·Vol. 11
·期 8
·3489-3494
·
IF 6.97
Zhen Tian,Pengfei Tian,Xiaojie Zhou,Gufan Zhou,Shiliang Mei,Wanlu Zhang,Xutao Zhang,Di Li,Ding Zhou,Ruiqian Guo,Songnan Qu,Andrey L. Rogach
Herein, we report UV-pumped white light emissive carbon dot (CD)-based phosphors to prevent blue light hazard in phosphor-converted WLEDs. Then, UV-pumped WLEDs with a color rendering index exceeding 85 and VLC with a modulation bandwidth of 75 MHz and a data transmission rate of 224 Mbps have been realized.
研究领域:
材料科学
·
光学工程
·
电子工程
✓ 已验证
DOI
高影响因子
IEEE Photonics Journal
·
2025
·
IF 2.4
Yexi Sun,Qianyu Huang,Xin Guo,Maohui Yuan,Kai Han
Lanthanide-doped phosphors are of importance in the practical applications. In this work, we investigated the photoluminescence properties and random lasing behaviors of Dy3+-doped Sr2MgMoO6 phosphors synthesized by the high-temperature solid-state method. The SEM, XRD, and EDS with elemental mapping results reveal the successful fabricating of the high-quality Sr2MgMoO6 phosphors and confirm the uniform distribution of constituent elements. Structural characterization through precise Rietveld refinement confirmed that the material crystallizes in a tetragonal system with space group I4/m (No. 87), and its refined lattice parameters are also determined. The effect of different Dy3+ doping concentrations on the luminescent properties was analyzed. The optimal doping concentration for achieving efficient luminescence is fixed at 0.08 mol%. Typical emission peaks centered at 484 nm, 576 nm, 656 nm, and 756 nm of Dy3+ were observed under the blue light excitation. Additionally, random lasing phenomena were observed in the Sr2MgMoO6 phosphors when excited with a 355 nm pulsed laser under varying pump power densities. The random lasing behaviours were confirmed by the emergence of narrow emission peaks with a narrow full width at half maximum (FWHM) and the dependence of the intensity on the excitation intensity. This work highlights the potential of Dy3+-doped Sr2MgMoO6 phosphors as efficient luminescent materials and demonstrates their application in random lasing, which opens new possibilities for their use in optoelectronic and laser technologies.
研究领域:
材料科学
·
光电子学
·
光子学
·
固体物理
·
激光技术
✓ 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）