Nanomaterials
·
2023
·Vol. 13
·期 15
·2153
·
IF 5.3
Hao Cui,Daguang Li,Yu Yang,Yuewu Fu,Yanhui Dong,Jing Yin,Weiping Qin,Zhixu Jia,Dan Zhao
Polymer-based waveguide amplifiers are essential components in integrated optical systems, as their gain bandwidths directly determine the operating wavelength of optical circuits. However, development of the wideband gain media has been challenging, making it difficult to fabricate devices with broadband amplification capability. Rare earth ion-doped nanoparticles (NPs) are a key component in the gain media, and their full width at half maximum (FWHM) of the emission peak decides the final gain bandwidth of the gain media. Here, KMnF3: Yb, Er, Ce@KMnF3: Yb NPs with the broad full width at half maximum (FWHM) of the emission peak covering the S+C band was prepared. The NPs were synthesized using a hydrothermal method, and the FWHM of the emission peak of NPs reached 76 nm under the excitation of a 980 nm laser. The introduction of Ce3+ions and a core-shell structure coating greatly enhanced the emission intensity of NPs at C band. Since KMnF3: Yb, Er, Ce@KMnF3: Yb NPs have exceptional broadband luminescence properties at C band, KMnF3: Yb, Er, Ce@KMnF3: Yb NPs can be the potential gain medium in the future polymer-based waveguide amplifiers.Keywords:KMnF3;nanoparticles;active-shell;core-shell;1.5 μm
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
MOLECULES
·
2023
·Vol. 28
·期 20
·7063
·
IF 4.6
Yutong Liu,Rui Han,Xiaohui Zhao,Yue Cao,Hui Cao,Yinjie Chen,Zhou Yang,Dong Wang,Wanli He
This paper focuses on preparing broadband reflective liquid crystal films through the diffusion of monofunctional and bifunctional monomers in a photoinduced trilayer system. By combining the hydrophilic and hydrophobic liquid crystal glass surface treatment technologies, the polymer network of polymer-stabilized cholesteric liquid crystal (PSCLC) itself serves as a diffusion channel to form a trilayer cholesteric liquid crystal composite system containing bifunctional monomers, a nematic liquid crystal composite system, and a cholesteric liquid crystal composite system containing monofunctional monomers. Utilizing the difference in the polymerization rates of monofunctional and difunctional polymerizable monomers, the monomers and chiral compounds diffuse relative to each other, so that the liquid crystal pitch exhibits a gradient distribution, and the broadened reflective width can reach up to 1570 nm. There is no doubt that new and improved processes and technologies offer important possibilities for preparing and applying PSCLC films.Keywords:cholesteric liquid crystal;broadband reflection;pitch gradient;photoinduced diffusion
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Optical Materials
·
2024
·
IF 8
Min Zhang,Peipei Dang,Yujia Wan,Yingsheng Wang,Zixun Zeng,Dongjie Liu,Qianqian Zhang,Guogang Li,Jun Lin
Visible-to-near-infrared (VIS-NIR) luminescent materials are in great demand in the field of non-destructive testing such as component determination and hyperspectral imaging. Although Cr 3+ -activated phosphors are widely reported, controllable tailoring ultra-wide VIS-NIR luminescence excited by blue light is still a challenge. The strategies of cationic substitution and energy transfers are effective for adjusting the luminescence of Cr 3+ -activated phosphors. In this work, a series of Cr 3+ -doped Sc-based solid solution phosphors (Ba 3-m Sr m Sc 4 O 9 :Cr 3+ ) are reported. Under the excitation of blue light, these phosphors exhibit broadband emission due to the different luminescence centers induced by Cr 3+ occupying different cationic sites. Because of the weaker crystal field strength, Cr 3+ realizes a broadband emission with a longer peak position (λ em = 820 nm) and broader full width at half maximum (FWHM≈182 nm) in Ba 2 SrSc 4 O 9 . Furthermore, Ce 3+ /Yb 3+ ions are introduced into Ba 2 SrSc 4 O 9 :Cr 3+ , achieving an ultra-wide VIS-NIR luminescence (460–1200 nm) by the Ce 3+ →Cr 3+ →Yb 3+ multiple energy transfers. Designing energy transfers is beneficial to improve the quantum efficiency and weaken the thermal quenching. Finally, the NIR phosphor-converted light-emitting diode (pc-LED) fabricated by Ba 2 SrSc 4 O 9 :Cr 3+ demonstrates great potential in night-vision and water component detection. This work provides an effective design idea for controllable tailoring ultra-wide VIS-NIR luminescence by chemical substitution and energy transfer.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PHYSICS
·
2024
·
IF 2
Xuan Gu,Zheng He,Xao-Yu Sun
Eu 2+ -doped Sr 2 LaGaO 5 phosphors were prepared using a high-temperature solid-state route in a furnace at 1450 °C. Their phase, microstructure, and luminescent performance were thoroughly investigated. The XRD measurements indicate that the prepared phosphors exhibit a tetragonal phase. Upon excitation at 450 nm, the Sr 2 LaGaO 5 :Eu 2+ phosphors demonstrate a broad red emission ranging from 475 to 850 nm, with a peak at 620 nm. At a doping concentration of 6 %mol Eu 2+ , the phosphors exhibit the highest emission intensity, characterized by CIE coordinates of (0.536, 0.453) and a color purity of 65.53 %. The temperature-dependent emission analysis reveals that the phosphors possess excellent thermal stability. The emission intensity of the Sr 2 LaGaO 5 :0.06Eu 2+ phosphor at 420 K is about 53.9 % of the initial intensity measured at 300 K, with a thermal activation energy of 0.393 eV. The pc-WLED device was constructed via the combination of an LED chip, yellow Y 3 Al 5 O 12 :Ce 3+ and the prepared Sr 2 LaGaO 5 :Eu 2+ phosphors, resulting in the emission of warm white light with a CCT value of 4985 K.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ACS Photonics
·
2024
·
IF 6.5
Zihao Dong,Qihang Zhang,Kai Liu,Zongyan Zuo,Qian-Jin Wang,Wenfeng Zhang,Yingkai Liu,Yan-Qing Lu,Yongyuan Zhu,Xuejin Zhang
Two-dimensional (2D) transition metal dichalcogenides (TMDCs) have been extensively investigated in photodetection due to their excellent optical and electrical properties. For TMDC monolayers, a large bandgap strongly limits the photoresponse range of photodetection, which can be extended to near-infrared wavelengths by two-photon absorption (TPA). However, it is usually difficult to reach telecom wavelengths, and inevitably results in the inefficiency of devices. Here, we address this issue by means of exciton-based interface engineering. Collaborating with TPA, excitons and interlayer excitons in van der Waals heterostructures can provide more degrees of freedom, including exciton resonance enhancement, working at telecom wavelengths, and broadband response. Moreover, the atomically flat interface of TMDC monolayer (heterostructure)/single-crystalline Ag demonstrates outstanding performance by virtue of high-efficiency conversion from excitons/interlayer excitons to photocarriers, as well as low loss of interface scattering. With an external bias, the broadband response of MoS2/WSe2 heterostructures on single-crystalline Ag can be achieved, with a responsivity of 1.08 mA/W at 1550 nm. Our results open possibilities for 2D semiconductors to realize broadband and sensitive photodetection.
研究领域:
材料科学
·
光学工程
·
半导体物理
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2022
·
IF 10.508
Gaochao Liu,Maxim S. Molokeev,Zhiguo Xia
Broadband near-infrared (NIR) light sources based on phosphor-converted light-emitting diodes (pc-LEDs) are desirable for biochemical analysis and medical diagnosis applications; however, the development of target NIR phosphor is still a challenge. Herein, broadband NIR phosphors, Cr3+-activated CaSc1–xAl1+xSiO6 (λem = 950 nm), are designed and optimized by chemical substitution toward enhanced quantum efficiency and thermal stability. Structural and spectral analyses along with density functional theory calculations reveal that Sc3+/Al3+ substitution contributes to enhancing the structural rigidity and the local symmetry of the [Sc/AlO6] octahedron so that the nonradiative relaxation of Cr3+ emission centers is suppressed significantly. The as-fabricated phosphor-in-glass-based NIR LED light source demonstrates great potential in the detection of alcohol concentration. This study provides a local structure design principle for exploring NIR phosphors with enhanced thermal stability and will also stimulate further studies on material discovery and quantitative analysis of NIR spectroscopy.
研究领域:
材料科学
·
光学工程
·
生物医学工程
✓ 已验证
DOI
高影响因子
Nanoscale
·
2022
·Vol. 14
·期 29
·10375-10388
·
IF 8.307
Congyu Zhou,Zhengjun Yao,Bo Wei,Wenying Li,Zhejia Li,Xuewei Tao,Jintang Zhou
The increasing hazard of electromagnetic radiation prompts people to pursue absorbing materials with better performance. However, absorbing materials with a single loss mechanism usually is unable to obtain better absorbing performance due to low impedance matching or high filling ratio. Therefore, this work proposes a C/NiCo2S4 (CNCS) material with both dielectric loss/magnetic loss to achieve efficient absorption of electromagnetic waves. The simple preparation of CNCS materials was achieved through the etching of the ZIF-67 template by nickel nitrate and the subsequent hydrothermal vulcanization process. Its unique prismatic dodecahedron hollow structure promotes multiple scattering of electromagnetic waves. The attachment of the magnetic NiCo2S4 particles on the surface of the carbon template further promotes the interface polarization and dipole polarization, which is equivalent to the formation of a resistance-rich microcircuit and enhances the effect of the conductance loss on electromagnetic waves. At 2–18 GHz, the CNCS-2 with 30% paraffin addition achieves an effective bandwidth of 5.54 GHz at a matching thickness of 1.7 mm, and has a maximum reflection loss of −36.44 dB at 1.5 mm. By adjusting the thickness of the material matching layer (1–3 mm), an effective bandwidth of up to 13.48 GHz can be achieved, perfectly covering the X-band and Ku-band. Based on the simple preparation process of the material, the special hollow structure and the multiple loss mechanisms for electromagnetic waves, we believe that CNCS can become a strong competitor for high-efficiency broadband absorbers.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 40
·14342-14351
·
IF 4.39
Shixiang Huang,Feng Zhang,Zhangyue Wu,Ying Fu,Chao Li
Motivated by the growing demand for noncontact temperature sensing in cryogenic environments, the development of a high performance low temperature optical thermometer has become more and more urgent. Herein, we demonstrate a new broadband emitting bismuth singly activated Ba2ZnSc(BO3)3 optical thermometric material that exhibits a remarkable temperature-dependent emission color variation and a good low temperature sensing performance. First, Bi3+ doped Ba2ZnSc(BO3)3 phosphors were successfully synthesized by a high-temperature solid-state reaction. Upon excitation at 320 nm, the emission spectra of Ba2ZnSc(BO3)3:Bi3+ cover almost the entire visible region from 350 to 720 nm because of the multiple crystallographic sites occupied by Bi3+ ions, which have been verified by structure analysis and time-resolved emission spectroscopy. Interestingly, the temperature dependent emission characteristics indicated that the thermal quenching phenomena of Bi3+ at different lattice sites were different, resulting in a very sensitive emission color variation from orange to cyan. Further analysis indicated that these Bi3+ doped luminescent materials showed a good performance in temperature sensing over a wide temperature range from 10 to 374 K, with a maximum relative sensitivity of 3.076% K−1 at 210 K. Finally, this study provides a new perspective for the design of superior thermosensitive phosphors, aimed toward non-rare earth ion doped thermosensitive phosphors for optical cryothermometry applications.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Shuyi Liu,Sijia La,Xuzheng Feng,Xiaoxu Sun,Xianggang Chen,Zishuo Wang,Jixiang Tang,Longfei Yan,Shuyuan Fan,Molang Cai
The phase segregation of wide-band gap perovskite solar cells (PSCs) typically originates from defect centers and strain induced by nonstoichiometric compounds. In this study, we have discovered an excess of PbI2 at the buried interface in inverted wide-band gap PSCs. To address this issue, RbI is introduced to interact with the excessive PbI2, thereby in situ forming a layer of inorganic perovskite RbPbI3. The presence of RbPbI3 as prenucleation centers facilitates intimate contact and enhances crystallinity of the wide-band gap perovskite, thereby alleviating lattice strain and reducing nonradiative recombination centers. Consequently, ion migration is suppressed, and phase segregation at the buried interface is inhibited. After the addition of RbI, the power conversion efficiency (PCE) of the wide-band gap semitransparent device is increased from 17.96 to 19.5%, and the bifacial factor is 83.4%. Furthermore, after continuous illumination at an intensity equivalent to AM 1.5 G for 1000 h, the device based on RbI retains approximately 81.71% of its initial PCE.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Xueyun Liu,Cuimei Cheng,Na Zeng,Xiaoman Li,Qing Jiao,Changgui Lin,Shixun Dai
In comparison to narrow-band upconversion (UC) luminescence from lanthanide-doped systems, broadband UC emission enables a broad and tailorable emissive color, which is desirable for tunable lasers and multicolor display applications. Herein, dual continuous broadband UC emission covering the visible spectral region at 480–720 nm has been achieved for the first time in Yb 3+ /Mn 2+ co-doped glass ceramics (GCs) functionalized with the precipitation of dual-phase γ -Ga 2 O 3 / β -YF 3 nanocrystals . A tunable UC emissive color from yellowish to orange could be obtained under 980 nm excitation by varying the Mn 2+ doping content and heat treatment temperature of GCs. We ascribe this phenomenon to the typical transition of exchange-coupled Yb 3+ -Mn 2+ dimers in tetrahedral and octahedral ligand environments. The Stokes and power-dependent UC luminescence properties, fluorescence lifetimes, site occupation and the involved UC mechanism are discussed in detail. This research contributes to a better understanding of the UC process between Yb 3+ and Mn 2+ in transparent hosts and provides a novel perspective for designing broadband-emitting UC materials.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Science Advances
·
2025
·Vol. 11
·期 20
·
IF 12.5
Gongyuan Zhang,Tom Albrow-Owen,Wenjun Peng,Xin Liang,Xianming Zhang,Pan Wang,Dawei Di,Shurong Dong,Jikui Luo,Guo Wang,Hongfeng Mu,Qian Zhao,Xuhan Guo,Qi Jie Wang,Tawfique Hasan,Zongyin Yang
The evolution of miniaturized spectroscopic tools is pivotal for expanding the application of spectral data across scientific, industrial, and consumer domains. Recent advancements in computationally augmented systems have dramatically reduced device form factors toward those compatible with consumer tech integration. However, for a commercial reality, most applications demand operation across visible to short-wave infrared (SWIR) range. In this regard, existing miniaturized devices are either constrained by physical properties; use complex, costly, or unscalable fabrication techniques; or require multiple components to address separate parts of the spectrum. Here, we report on a low-cost, visible to SWIR, miniaturized spectrometer design enabled by a mass-producible, nonlithographic method of engineering planar dispersive elements from widely available plastics. By deforming shape memory epoxies, we encode spectral information, which is processed by a complementary metal oxide semiconductor sensor array and reconstructed via algorithms. This design offers broadband capability from 400 to 1600 nanometers and enables line-scanning spectral imaging, paving the way for affordable spectrometers.
研究领域:
光学工程
·
材料科学
·
计算机科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Ruixiang Deng,Bingbing Chen,Haogeng Li,Ke Zhang,Tao Zhang,Yun Yu,Lixin Song
Microwave absorbers serve the purpose to ensure the transmission efficiency and accuracy in 5G telecommunications. Two-dimensional MXene has great potential in absorbing microwave. In this study, MXene(Ti 3 C 2 T x )/Co 3 O 4 composites are successfully fabricated by a facile and stable hydrothermal treatment in concentrated strong base and Argon environment, followed by a one-step annealing process. Phase composition , chemical state of elements, morphology and structure of the new composite materials are studied by systematical characterization. It is revealed that adsorbed Na + ions and terminations, which are generated at the interface during hydrothermal treatment in concentrated NaOH solution, can protect the Ti 3 C 2 T x from being decomposed. The synthesis mechanism is also proposed for stable fabrication of other MXene-based composite materials. The MXene/Co 3 O 4 composite is able to perform single-band absorption, multiband absorption and even broadband absorption in 2–18 GHz band by tuning its composition and thickness. Particularly, better than 90% absorption in a wide range of 10.8–17 GHz can be achieved with a thickness of just 2 mm. Enhanced wideband absorption originates from the multilayer structure , the surface defects , the conductivity of Ti 3 C 2 T x and the capacitance structure of Co 3 O 4 . Ultrathin and broadband high absorption features make the material a promising candidate for future application.
研究领域:
材料科学
·
电磁材料
·
通信技术
✓ 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）