Inorganic Chemistry Frontiers
·
2024
·Vol. 11
·期 23
·8547-8554
·
IF 6.1
Qianyi Chen,Zhenjie Lun,Dongdan Chen,Yongsheng Sun,Puxian Xiong,Siyun Li,Shanhui Xu,Zhongmin Yang
The development of extra-broadband visible emission phosphors is crucial to achieve next-generation illumination with better color experience. Herein, a defect engineering strategy mediated by the structural cationic substitution is proposed and experimentally demonstrated for specific ultra-broadband emission in a garnet phosphor. The induced oxygen vacancies and interstitial cation through lattice distortion break the periodic potential field of the crystal and provide electronic levels in the band gap. As a result, excited by blue-light-emitting diodes, the novel Y3Sc2Al3O12:B3+ shows an ultra-broad emission with a full width at half maximum (FWHM) of ∼170 nm. Compared to general defect-emitting phosphors, the unique Y3Sc2Al3O12:B3+ exhibits excellent thermal quenching resistance and superior internal quantum efficiency of up to 95%. These findings not only show great promise of Y3Sc2Al3O12:B3+ as an extra-broadband emitter but also provide a new design strategy to achieve a full-visible-spectrum phosphor in a single-component material for white-light applications.
研究领域:
材料科学
·
光电技术
·
光子学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Chunyan Zhou,Hua Fan,Jinling Huang,Shu Li,Yaoyao Huang,Meiping Huang,Yin Huang,Xinjing Guo,Liya Zhou
Broad red emitting phosphors are essential for the growth of indoor plants. Previous Mn 4+ -activated far-red phosphors typically displayed narrow emission, which could not well overlap with plant pigment absorption. A high temperature solid state technique was used to create the unique double perovskite LaGeSbO 6 :Mn 4+ phosphor with an emission peak centered at 700 nm and an impressive full width at half maximum (FWHM) of 100 nm. The origin of ultra-broadband emission of LGS:Mn 4+ phosphors was confirmed by crystal structure and time-resolved spectra owing to the occupation of the two octahedral [SbO 6 ] and [GeO 6 ] centers by the Mn 4+ ion. The quenching mechanism is brought about by the dipole-dipole interaction. The broadband emission is substantially broader than that of other Mn 4+ -activated red emitting phosphors previously described. Besides, the emission spectrum of LaGeSbO 6 :0.4%Mn 4+ matches well with the phytochrome P FR absorption band for plant development. All of the findings suggested that the novel LaGeSbO 6 :Mn 4+ phosphor could be potentially used in light-emitting diodes for indoor plant culture.
研究领域:
园艺学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2023
·
IF 10.9
Junyu Lu,Haoruo Zhang,Mushan Yuan,Xiaochuang Di,Long Ni,Yinfu Luo,Yang Chen,Huawei Zou
The application of microwave absorption (MA) materials in realistic aerospace scenarios would be difficult without a reliable mechanical carrier. However, achieving broad effective absorption bandwidth (EAB) of the aramid honeycomb at low weight gain is still a significant challenge. Herein, we achieved rapid in-situ flowering of RGO with 3D distribution in honeycomb holes by optimizing the hydrophilic thermal (HDT) N 2 H 4 ·H 2 O reduction process, making full use of the internal space of the honeycomb. The synergy of super-broadband MA and ultra-light in aramid honeycomb can be achieved by filling the 3D macro-dispersed flower-like RGO without other media. In the frequencies of 2–18 GHz, the minimum reflection loss (RL min ) of −48.38 dB was obtained in a 3% (w/w) RGO-filled honeycomb at 14.80 GHz, with a thickness of 5.2 mm. Moreover, the 3% (w/w) RGO-filled honeycomb composites achieve a broad EAB of 13.84 GHz at the thickness of 9.0 mm with only 3% increase in weight. Actual and simulated MA performance verifies the uniformity and reliability of the foamed RGO-filled honeycomb composites, where the power loss of the composites is mainly based on the conductive losses and multiple polarization from the macroscopic distribution of RGO. The electromagnetic parameters of the foamed RGO-filled honeycomb can precisely be controlled through the weight gain of GO impregnation. Compared to ordinary impregnated coatings with high weight gain, this study provides a simple and effective pathway for preparation of MA honeycomb structures with weight gain less than 4%, which have a significant potential in the field of aerospace stealth.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2022
·Vol. 11
·期 5
·2202291
·
IF 10.05
Shuai Huang,Yu Yan,Mengmeng Shang,Yining Wang,Yixin Sun,Peipei Dang,Jun Lin
Cr 3+ -activated near-infrared (NIR) phosphors have attracted wide attention owing to applications in phosphor-converted light-emitting diodes (pc-LED) for spectroscopy. Because a broader spectrum covers more information to detect, the width of the spectrum is an important parameter to consider. Here, the blue LED excitable ultra-broadband Cr 3+ -activated LiInGeO 4 phosphors, which exhibit unprecedented long-wavelength NIR emission with a wide full-width at half maximum (FWHM) of 305 nm, are developed. The overall emission tuning from 1165 to 875 nm with broadened FWHM from 305 to 508 nm is realized through designing continuous solid solution hosts of LiIn 1− z Sc z GeO 4 /(LiIn) 1− y Mg 2 y GeO 4 and finite solid solution hosts of (LiIn) 1− y Zn 2 y GeO 4 :Cr 3+ . The observation of such long-wavelength NIR from Cr 3+ not Cr 4+ is studied and confirmed by electron paramagnetic resonance, X-ray absorption near-edge structure, and steady-/transient-state photoluminescence. The formation of finite solid solutions induces the change in the local structure of Cr 3+ that ultimately leads to the observation of super broadband (FWHM = 508 nm) luminescence. The luminescence mechanism is discussed in this study. Finally, this study demonstrates that the as-synthesized phosphors with tunable NIR luminescence can be well used in NIR pc-LEDs for spectroscopy detection.
研究领域:
材料科学
·
光学
·
发光材料
✓ 已验证
产品关联
DOI
高影响因子
APPLIED PHYSICS LETTERS
·
2023
·Vol. 122
·期 18
·
IF 4
Xu Baoyin,Du Haozhe,Yang Bin,Ding Zhanhui,Wang Xiancheng,Wang Yanchao,Li Ziheng,Li Yongfeng,Yao Bin,Ma Hong-An,Lan Yucheng
The exploration of novel ultrawide bandgap (UWBG) semiconductors is becoming a challenging and compelling research focus on semiconductor physics, materials, and device applications. Ternary B–C–N compounds have attracted much attention because their electronic structure and semiconductor properties are quite different depending on the chemical composition and atomic arrangement of boron, carbon, and nitrogen elements in the lattice. However, the lack of well-controlled high-quality B–C–N crystals has limited their potential as UWBG devices. In this study, B–C–N compounds are synthesized in bulks from graphite and hexagonal boron nitride ( h -BN) using ball milling and high-pressure high temperature technique. The synthesized B–C–N compounds produced are highly crystallized layered-materials with intercalated graphene layers in C-doped h -BN layers. The doped carbon atoms occupy boron sites and nitrogen sites of the h -BN layers unbalanced, giving rise to the n -type conductivity of the B-C-N layered compounds. The measured optical bandgaps range from 3.4 to 6.0 eV, which can be regulated by the carbon content. Their electronic properties are also tunable. Our work is expected to initiate potential applications of the B–C–N material as UWBG semiconductors.
研究领域:
材料科学
·
半导体物理
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 8
·期 4
·1286-1291
·
IF 6.641
Xiaoxi Li,Zifei Wang,Yang Liu,Weiguang Zhang,Chaofeng Zhu,Xiangeng Meng
Fluorescent carbon dots (CDs) have emerged as promising materials for white light-emitting diodes (WLEDs) on account of carbon's intrinsic merits of high stability, low cost, and environment-friendliness. However, CDs usually give relatively narrow emission with full width at half maximum within 70–90 nm, which fundamentally restrains construction of CDs-based WLEDs with high color rendering index (CRI). Here, we demonstrate tricolor ultrabroad-band (109–120 nm) emissive CDs (Tri-CDs) with a quantum yield (QY) up to 21–64% by a one-pot solvothermal route. Experimental investigations reveal that tunable emissions of these CDs are based on differently sized sp2 conjugated domains and the content of graphitic nitrogen, which can be modulated by controlling the carbonization and deamination processes during solvothermal reactions. The ultrabroad-band emission spectra of Tri-CDs originate from broad distribution of the particle size. A WLED with Commission Internationale de l’Eclairage (CIE) color coordinate of (0.362, 0.370) and high CRI of 96.5 is fabricated by integrating Tri-CDs films with an ultraviolet LED chip. This work opens up a new opportunity for the development of high CRI CDs-based WLEDs.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Wenchong Ouyang,Lin Mei,Qi Liu,Chengbiao Ding,Yanming Liu,Chengwei Zhao,Limin Xu,Fu Lu,Dongpeng Luo,Chunguang Miao,Yu Bai,Quanming Lu,Tianzhi Luo,Zhengwei Wu
Conductive hydrogels show excellent application potential in flexible and stretchable electromagnetic interference (EMI) shielding materials due to their water-rich porous structure and tissue-like mechanical properties. However, integrating multiple functions into EMI shielding materials remains challenging, including ultra-broadband EMI shielding, mechanical properties, strain sensitivity, flexibility, etc., with high performance. Here, through a straightforward and scalable combination of ultrasound-assisted dispersion and thermal polymerization, we have successfully synthesized the MXene/PE-CS composite hydrogels composed of acrylic acid (AA), 2-(Dimethylamino) ethyl methacrylate (DMAEMA), and chitosan (CS). It exhibits more comprehensive and excellent functionalities including high stretchability (0.47 MPa, 747 %), strain sensitivity (11.2), ultralow thickness (0.5–2.0 mm), good adhesion (0.13 MPa), and flexibility. More importantly, it achieves excellent shielding performance of more than 99.99 % in ultra-broadband (X-band, Ka-band, Ku-band, and THz-band) under ultralow thickness (0.5–2 mm) and MXene (transition metal carbides/nitrides) content (0.46 wt%), and the shielding properties can be dynamically controlled through MXene content, PE content and hydrogel thickness. Even after repeated stretching, bending, and long-term water evaporation, it still exhibits stable and high-performance EMI shielding performance. Our MXene/PE-CS composite hydrogels exhibit potential applications in ultra-broadband shielding for new generation flexible wearable electronic devices.
研究领域:
材料科学
·
柔性电子
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Gang Shao,Junfang Liang,Wanyu Zhao,Biao Zhao,Wen Liu,Hailong Wang,Bingbing Fan,Hongliang Xu,Hongxia Lu,Yiguang Wang,Rui Zhang
Ultra-wide absorption bandwidth is one of the goals of ideal absorbing materials. In this article, three-dimensional porous microstructure Co/SiCN ceramic aerogel composites (CACs) were synthesized through a reverse microemulsion method, which is aimed to avoid the aggregation of cobalt nanoparticles , and makes better impedance matching between CACs surface and air to obtain an outstanding microwave absorption (MA) performance. The complex permittivity of the CACs could be tuned via the concentration of cobalt acetate solution. The MA results indicate that CACs with cobalt acetate solution concentration of 0.5 mol/L shows an excellent MA properties with ultrabroad bandwidth 8.5 GHz covering the whole K band (18–26.5 GHz). The excellent MA performance can be attributed to good impedance matching, multiple reflections, polarization processes, and the synergistic effects in the CACs. Therefore, our study paves a novel way to fabricate the promising lightweight MA materials with ultrabroad absorption bandwidth at higher frequency.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Tongshu Zhang,Yuheng Zhang,Fulong Hao,Huidong Xie,Zhihua Leng,Zuobin Tang
The development of highly efficient and thermally stable phosphors with ultra-broadband emission is critical to advancing the practical applications of portable near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs). Herein, we employ the chemical unit co-substitution strategy to quantitatively introduce Mg 2+ and Si 4+ ions into the garnet lattice, yielding the high-performance Lu 3 Ga 3 MgSiO 12 :Cr 3+ (LGMSO:Cr 3+ ) phosphor, which exhibits an ultra-broadband emission with a full width at half maximum (FWHM) of 181 nm and a photoluminescence quantum yield (PLQY) of 63.7 %. Structural analysis reveals that Mg 2+ -Si 4+ co-substitution induces multiple Cr 3+ occupancy within distorted (Ga/Mg)O 6 octahedra, broadening emission band via a multisite-induced effect, as confirmed by low-temperature spectral analysis (80 K) and crystal field calculations. Furthermore, co-doping with Yb 3+ enhances the emission bandwidth and thermal stability (from 48.4 % to 71.0 % at 423 K), attributed to the combined contributions of Cr 3+ emission ( 4 T 2 ( 4 F ) → 4 A 2 ) and Yb 3+ emission ( 2 F 5 / 2 → 2 F 7 / 2 ) excited via Cr 3+ energy transfer. Packaged LED devices show superior night vision and non-destructive biological penetration capabilities, highlighting the phosphor’s potential for NIR pc-LED applications.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Shihai Miao,Yanjie Liang,Dongxun Chen,Ruiqi Shi,Xihui Shan,Yi Zhang,Fei Xie,Xiao-Jun Wang
Infrared-emitting phosphor-converted light-emitting diodes (LEDs) are desirable light sources for a very wide range of applications such as spectroscopy analysis, nondestructive monitoring, covert information identification, and night-vision surveillance. The most important aspect of infrared emitters for spectroscopy is to cover the widest possible wavelength range of emitted light. However, developing ultrabroad-band infrared emitters based on converter technology is still a challenging task due to the lack of suitable phosphor materials that emit in a wide wavelength range upon excitation from blue-emitting chips. Herein, this work demonstrates Cr3+-activated Mg2SiO4 infrared phosphors with a super wide infrared spectral range of 600 to 1400 nm and high internal quantum yield up to 80.4% upon 460 nm excitation. Site-selective occupancy of Cr3+ emitters in two different Mg sites in the Mg2SiO4 lattice results in two distinct broad emission bands peaking at 760 and 970 nm, both of which contribute to the ultrabroad-band infrared luminescence with a full width at half maximum (FWHM) of 419 nm. This is by far the broadest infrared emission to the best of our knowledge. On this basis, an ultrabroad-band infrared LED prototype has been fabricated by the combination of the Mg2SiO4:Cr3+ phosphor with a blue LED chip, which shows great potential for imaging and sensing applications. This work demonstrates that site-selective occupancy control of Cr ions is an effective strategy for developing ultrabroad-band Cr3+-doped phosphors.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
Photonics Research
·
2020
·Vol. 8
·期 8
·1301-1308
·
IF 6.099
Yifan Li,Yating Zhang,Zhiliang Chen,Qingyan Li,Tengteng Li,Mengyao Li,Hongliang Zhao,Quan Sheng,Wei Shi,Jianquan Yao,Jianquan Yao
Self-powered and flexible ultrabroadband photodetectors (PDs) are desirable in a wide range of applications. The current PDs based on the photothermoelectric (PTE) effect have realized broadband photodetection. However, most of them express low photoresponse and lack of flexibility. In this work, high-performance, self-powered, and flexible PTE PDs based on laser-scribed reduced graphene oxide (LSG)/CsPbBr3 are developed. The comparison experiment with LSG PD and fundamental electric properties show that the LSG/CsPbBr3 device exhibits enhanced ultrabroadband photodetection performance covering ultraviolet to terahertz range with high photoresponsivity of 100 mA/W for 405 nm and 10 mA/W for 118 μm at zero bias voltage, respectively. A response time of 18 ms and flexible experiment are also acquired at room temperature. Moreover, the PTE effect is fully discussed in the LSG/CsPbBr3 device. This work demonstrates that LSG/CsPbBr3 is a promising candidate for the construction of high-performance, flexible, and self-powered ultrabroadband PDs at room temperature.
研究领域:
材料科学
·
光电子学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 8
·期 5
·1598-1607
·
IF 6.641
Peipei Dang,Dongjie Liu,Xiaohan Yun,Guogang Li,Dayu Huang,Hongzhou Lian,Mengmeng Shang,Jun Lin
Herein, we report a new series of Ba1+xSr1−xGa4O8:Bi3+ (x = 0–0.7) phosphors that exhibit extremely broadband emission, covering almost the entire visible region and extending to the deep-red region, when excited by ultraviolet light. BaSrGa4O8:Bi3+ exhibits two emission bands located at 470 and 570 nm originating from different emission centers. With the gradual substitution of Ba for Sr, both of the emission bands show a red-shift, from 470 to 510 nm and from 570 to 630 nm, respectively. The corresponding full width at half maximum (FWHM) increases from 192 to 283 nm, which is attributed to a superposition of multiple emission centers via crystal field regulation. As a result, the emission can be tuned from cyan to orange across the warm white light region in Ba1+xSr1−xGa4O8:Bi3+ (x = 0–0.7) systems. Simultaneously, this series of phosphors presents good thermal stability (97% intensity at 150 °C for the Ba1.5Sr0.5Ga4O8:Bi3+ sample) and the thermal quenching will decrease with the formation of a solid solution due to the increasing rigidity of the lattice structure. Interestingly, the two emission bands in the representative Ba1+xSr1−xGa4O8:Bi3+ (x = 0–0.7) sample exhibit different thermal responses to increasing temperature, thus an optical thermometer with color discrimination and good sensitivity is designed. The maximum relative sensitivity (Sr) is 1.295% K−1 in the temperature range of 7–400 K. The corresponding emission color can be tuned from blue-cyan to orange, including white light. This work presents a rational design strategy for controllable ultra-broadband emission tuning across the white light region and to further explore potential optical sensor applications.
研究领域:
材料科学
·
光学
·
传感器技术
✓ 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）