CARBOHYDRATE POLYMERS
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2023
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IF 11.2
Jiaqi Wang,Yuanhang Li,Xiaotong Li,Jiangbo Pan,Di Wang,Shuangying Wei,Chengyu Wang,Jian Li
Biological macromolecules had been studied as ligands in recent years, which not only give the complexes excellent polymer properties, but also have many advantages such as biodegradability. Carboxymethyl chitosan (CMCh) is excellent biological macromolecular ligand because of its abundant active amino and carboxyl groups, and it can smoothly transfer energy to Ln 3+ after coordinating. To further study the energy transfer mechanism of CMCh-Ln 3+ complexes, CMCh-Eu 3+ /Tb 3+ complexes with different Eu 3+ /Tb 3+ ratios were prepared by using CMCh as a ligand. The morphology, structure, and properties of CMCh-Eu 3+ /Tb 3+ were characterized and analyzed by infrared spectroscopy, XPS, TG and Judd-Ofelt theory, thus the chemical structure of CMCh-Eu 3+ /Tb 3+ was determined. The mechanism of energy transfer was explained in detail, also the Förster resonance transfer model is confirmed, and the hypothesis of energy transfer back was verified by the characterization and calculation methods of fluorescence spectra, UV spectra, phosphorescence spectra and fluorescence lifetime. Finally, CMCh-Eu 3+ /Tb 3+ with different molar ratios were used to prepare a series of multicolor LED lamps, and it extends the application range of biological macromolecules as ligands.
研究领域:
材料科学
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生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Laser & Photonics Reviews
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2024
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IF 9.8
Xi Chen,Zehan Lu,Yuexiao Pan,Yihong Ding,Hongzhou Lian,Jun Lin,Liyi Li
The development of efficient, stable, and cost-effective luminescent materials is crucial for advancing lighting and display technologies. In this study, a series of tunable luminescent materials based on the novel 0D all-inorganic perovskite (AIP) crystal Rb₃ZnBr₅ (RZB) is obtained. The emission of Sn 2 ⁺ doped RZB spans the entire visible light range and extends into the near-infrared (NIR) region, achieving a photoluminescence quantum yield (PLQY) of 75%. The distinct lifetimes combined with theoretical calculations, indicate that the broadband dual-peak emissions at 496 and 636 nm originate from the singlet and triplet states of Sn 2 ⁺, respectively, which is rarely observed in Sn 2 ⁺-doped perovskite crystals. The phosphor RZB:Sn 2 ⁺ demonstrates the high thermal stability, along with excellent moisture and air stability. Co-doping RZB with Sn 2 ⁺ and Mn 2 ⁺ broadens the excitation spectrum and allows precise control over the excitation wavelength, facilitating dynamic transitions from warm white to yellow and green light. This feature is particularly beneficial for multicolor LEDs and multi-level anti-counterfeiting applications.
研究领域:
材料科学
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Yinhua Wang,Songchao Bai,Hao Liang,Chao Li,Tianya Tan,Gang Yang,Jiwei Wang
Lead-free double perovskites have become the research hotspot in the optoelectronic fields. Then, it is a challenge to utilize the lattice doping by different rare earth ions with rich energy level and unique luminescence for emerging photonic applications. Here, we successfully prepared Sb 3+ and Ln 3+ ions doped Cs 2 NaYCl 6 single crystals (SCs), bringing tunable bright luminescent emissions of blue, red, and white light, the highest photoluminescence quantum yield (PLQY) is up to 58.33%. Based on excellent and tunable luminescent properties, the multicolor light-emitting diodes (LEDs) applications for the rare earth-based double perovskite SCs were designed. These findings indicate that rare earth-based double perovskite will provide a broader application space for lighting.
研究领域:
光电
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材料科学
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光子学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Tao Sun,Meng Qi,Qing-Xiu Li,Hang-Fei Li,Zhi-Peng Feng,Run-Ze Xu,You Zhou,Yu Wen,Gui-Jun Li,Ye Zhou,Su-Ting Han
Gait is among the most dependable, accurate, and secure methods of biometric identification. However, high power consumption and low computing capability are two major obstacles on wearable sensors-based gait recognition system. In this work, an integrated system is reported combining a triboelectric nanogenerator (TENG), a memristor (Ag/HfO x /Pt), and perovskite-based multicolor LEDs (PMCLED) for the visualization and recognition of foot patterns through signal-on-none and multi-wavelength on-device preprocessing. The flexible TENG acts as a sensory receptor, generating voltage based on the duration and intensity of pressure, which in turn promotes voltage-triggered synaptic plasticity in the memristor. The PMCLED, with its threshold switching and multi-wavelength emission characteristics, enables nonlinear filtering and amplification of the synaptic signal from the memristor, resulting in a simplified system design and reduced background noise. Additionally, the effectiveness of on-device preprocessing is validated based on a 5 × 5 array of integrated devices and software-built neural network for foot pattern visualization and recognition. The proposed system is able to recognize the on-device preprocessed images with high accuracy, indicating great potentials in both healthcare monitoring and human-machine interaction.
研究领域:
生物识别
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可穿戴技术
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纳米技术
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神经网络
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人机交互
✓ 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）