ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Daqin Chen,Su Zhou,Gaoliang Fang,Xiao Chen,Jiasong Zhong
Currently, it is of great challenge to achieve cation exchange in CsPbX3 (X = Cl, Br, I) perovskite nanocrystals (NCs) on account of rigid Pb2+ octahedral coordination protected by six halogen anions (PbX64–). Herein, we demonstrate that dynamic halogen exchange can effectively open up PbX64– octahedrons and enable fast Mn-to-Pb cation exchange at room temperature in a few seconds. Importantly, Cl concentration rather than Mn one is demonstrated to be a dominant factor for cation exchange, where different Mn2+/Cl– salts can be adopted as Mn/Cl sources and Cl-to-Cl or Cl-to-Br anion exchange is the necessary prerequisite. Such a facile synthesizing method can lead to the feasibility of tuning emissive colors for the Mn-doped CsPb(Cl/Br)3 NCs by controlling both cation and anion exchanges and open a new way to replace Pb2+ in CsPbX3 NCs by other nontoxic metal elements.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 105
·期 1
·441-450
·
IF 3.784
Jingtao Zhao,Lei Lei,Renguang Ye,Can Li,Zhanling Lu,Degang Deng,Lihui Huang,Xianghua Zhang,Shiqing Xu
Lanthanide-doped up-conversion (UC) materials with color tunable property show promising application in many fields, such as biological imaging, optical multiplexing, and information security. Although great efforts have been devoted to regulate UC emission color via modifying chemical composition, crystal structure, or external stimuli condition, it is remain a daunting challenge to develop a general strategy that probably suitable for various lanthanide-doped nano-systems. Herein, we verify the cross-relaxation possibility between sensitizer Yb 3+ and activator Er 3+ as well as Er 3+ - Er 3+ pairs can be well modified by engineering the crystal lattice distortion of matrix, leading to the evident UC emission color variations. Specifically, with incorporating Al 3+ or Ca 2+ ions into the Yb/Er co-doped BaF 2 nanocrystals (NCs) contained glass ceramics (GCs), the contraction of the crystal lattice lead to the change of UC emission color from green to red. On the contrary, the high laser excitation power results in the lattice expansion of the Al 3+ -doped BaF 2 :Yb/Er GCs at different Yb 3+ concentration as well as Al 3+ doped CaF 2 GCs, which leads to the greatly increased green-to-red ratio. These multi-color UC GCs show potential application in anti-counterfeiting filed. Our results open up a general avenue for the control of UC emission color via engineering crystal lattice distortion.
研究领域:
材料科学
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光学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2025
·
IF 3.5
Wei Zhu,Jialing Zhou,Feifei Huang,Renguang Ye,Youjie Hua,Shiqing Xu
The color rendering index (CRI) of white light-emitting diodes (LEDs) is very important for lighting quality. Currently, high-CRI white LEDs are typically fabricated by combining multiple-color phosphors. Therefore, the realization of multipeak-emission phosphors in a single phosphor is valuable. The Sr 2 LiAlO 4 : Eu 2+ phosphor exhibits an obvious double-peak emission in the yellow-green spectral range and has excellent luminescence properties , suggesting its potential application in white LEDs. In this study, a series of Sr 2 LiAlO 4-1.5 x N x : Eu 2+ ( x = 0–0.7) phosphors were successfully synthesized by introducing N 3− ions to replace O 2− ions. The luminescence intensity was significantly enhanced by increasing the N 3− concentration. Upon reaching a concentration of 0.7, the intensity of the yellow emission exceeded that of the green emission, indicating a shift in emission color from green to yellow. The emission peak of the Sr 2 LiAlO 2.95 N 0.7 : Eu 2+ phosphor is at 568 nm, which exhibited broader yellow light emission. Finally, Sr 2 LiAlO 2.95 N 0.7 : Eu 2+ was fabricated with a CaAlSiN 3 : Eu 2+ red phosphor on 450 nm blue LED chips. The fabricated white LEDs was observed to be white light with a high CRI of 92.1 and an adjustable color temperature (4938-6665k), showing its potential application in white LEDs.
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DOI
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Hairegu Tuxun,Jinyu Li,Hande Lee,Yunyang Li,Jiabao Xiong,Yilizhat Yilihamu,Yingni Duan,Yaqi Zhu,Huan Chen,Nuernisha Alifu
Lanthanide doped upconversion (UC) materials have attracted much attention owing to their unique near-infrared to visible upconverted emission characteristics. However, it still remains a challenge for a fine tuning of emission colors in UC materials and especially in microcrystals. In this work, we report a novel method to realize emission color tuning in microrods through the plasmonic heating effect generated by the nano-islands (Au NIs) under 980 nm laser illumination. It is found that Au NIs was a good optical heater system and its temperature can be controlled by changing the excitation power. The structure of single NaYF 4 microrod can transform into YOF and Y 2 O 3 by simply altering the local temperature via plasmonic heating effect, which contributes to an excellent crystallinity of YOF and Y 2 O 3 microrods by comparison to conventional heating methods. Importantly, these YOF:Er 3+ /Yb 3+ and Y 2 O 3 :Yb 3+ /Er 3+ microrods show much bright and tunable color output from red to yellow and green in contrast to those obtained by conventional heating methods. Furthermore, the local temperature in the plasmonic heater can be obtained by analyzing the integrated intensity ratio of Er 3+ emissions from the thermally coupled 2 H 11/2 and 4 S 3/2 states, and high local temperature up to 843 K was achieved. Our results provide a new strategy to manipulate the luminescence property of single microcrystal materials and extends the application of surface plasmon to broader fields.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 49
·2306875
·
IF 19
Longchao Guo,Ping Xia,Ting Wang,Alexey Nikolaevich Yakovlev,Tingting Hu,Feng Zhao,Qingyuan Wang,Xue Yu
Mechanoluminescence (ML) materials are capable of converting applied stress into luminescent signals, and offer fascinating potential applications in biomedicine, safety testing, structural diagnosis, and mechanical sensing. Color-responsive ML sensing, combined with quantitative evaluation of loaded stress, is preferred for visual description and sensing reliability. In this work, Yb 2+ and Mn 2+ ions co-doped MgF 2 with a fascinating ratiometric ML performance are successfully explored. ML color can be manipulated based on the distinct stress-dependent ML intensity of the activators. Furthermore, a self-activated orange persistent ML is observed even after the removal of the mechanics stimuli, allowing a delayed stress sensing with the memorized optical signals. Accordingly, a visualized stress sensing with the as-explored ML composites using the ultraviolet curing 3D printing technique is demonstrated for structural mechanics. Herein, a feasible optical description of the loaded stress distribution in space for objects free from concerns with dimensions and geometrical shapes can be realized, benefiting the study of 3D structural mechanics, especially for complex structures.
研究领域:
材料科学
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固态物理
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结构工程
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光学传感
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功能材料
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机械测试
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纳米力学
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生物医学工程
✓ 已验证
DOI
高影响因子
BIOMASS & BIOENERGY
·
2025
·
IF 5.8
Yanbing Zhang,Xilin Zhou,Jingtai Zhang,Caixia Liu,Huihui Liu,Ruocai Bai,Siyi He,Linjun Zhong,Yan Wu
This study developed a metal salt-based deep eutectic solvent (MDES) process to fabricate transparent wood from ( Chamaecyparis obtusa (Sieb. et Zucc.) Endl. var. formosana (Hayata) Rehd. ). Lactic acid combined with zinc chloride, copper chloride, or iron chloride formed the solvent, which effectively achieved primarily through the selective modification of lignin chromophores rather than extensive delignification, with only 2.78–3.99 % lignin removal while preserving the cellulose microstructure. Subsequent epoxy vacuum impregnation created a continuous phase within the DES-treated wood template. The resulting transparent wood exhibited exceptional optical performance with 90.8 % transmittance and 46 % haze, along with remarkable mechanical properties including 470 MPa tensile strength and 7.2 % elongation at break. The material also showed significantly improved water resistance with 142 % reduction in water absorption. Furthermore, the coordination between metal ions and lignin enabled effective color tuning, producing reddish-brown, bluish-green, and yellowish-red hues with Fe 3+ , Cu 2+ , and Zn 2+ respectively. This work provides an efficient and sustainable strategy for producing transparent wood with customizable optical and aesthetic properties.
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 47
·期 5
·2556-2564
·
IF 3.925
Juan-Juan Shao,Jian-Ling Ni,Wei-Min Chen,Peng-Lai Liu,Abraham Mensah,Li-Zhuang Chen,Fang-Ming Wang
As a luminescent material with excellent structural diversity and optical tunability, cuprous iodide organic–inorganic hybrid semiconductors have attracted extensive attention in the field of environmental friendly solid-state lighting (SSL). In order to systematically study how tiny changes in ligands influence the luminescence properties of their complexes, in this study, the tail atoms of ethyl groups in ligands are modified with halogen atoms (F, Cl, and Br) and four all-in-one (AIO)-structured cuprous iodide inorganic–organic hybrid semiconductor materials (Cu2I4(Ln)2) are successfully obtained. The adjustment of the tail atoms effectively regulated the stacking modes of Cu2I42− clusters and their luminescence properties, realizing the transition of the crystal luminescence color from blue to green with the internal quantum yield (IQY) increasing from 1.57% to 53.39%. Their optical diffuse reflectance spectra and density functional theory calculations (DFT) helped investigate the origin and mechanism of luminescence. They are very stable and have good solution processability, which means that they can be applied as rare-earth element-free lighting phosphors. This study can provide ideas and a theoretical basis for designing cuprous iodide cluster luminescent materials in future.
研究领域:
材料科学
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无机化学
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光电子学
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半导体物理
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发光材料
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计算化学
✓ 已验证
DOI
高影响因子
Gels
·
2025
·Vol. 11
·期 8
·568
·
IF 5.3
Yi Wang,Enkai Lin,Ze Wang,Tong Feng,An Xie
Electrochromic (EC) devices are gaining increasing attention for next-generation smart windows and low-power displays due to their reversible color modulation, low operating voltage, and flexible form factors. Recently, electrochromic energy storage devices (EESDs) have emerged as a promising class of multifunctional systems, enabling simultaneous energy storage and real-time visual monitoring. In this study, we report a flexible dual-functional EESD constructed using polyaniline (PANI) films doped with anthraquinone-1-sulfonic acid sodium salt (AQS), coupled with a redox-active PVA-based gel electrolyte also incorporating AQS. The incorporation of AQS into both the polymer matrix and the gel electrolyte introduces synergistic redox activity, facilitating bidirectional Faradaic reactions at the film–electrolyte interface and within the bulk gel phase. The resulting vertically aligned PANI-AQS nanoneedle films provide high surface area and efficient ion pathways, while the AQS-doped gel electrolyte contributes to enhanced ionic conductivity and electrochemical stability. The device exhibits rapid and reversible color switching from light green to deep black (within 2 s), along with a high areal capacitance of 194.2 mF·cm−2at 1 mA·cm−2and 72.1% capacitance retention over 5000 cycles—representing a 31.5% improvement over undoped systems. These results highlight the critical role of redox-functionalized gel electrolytes in enhancing both the energy storage and optical performance of EESDs, offering a scalable strategy for multifunctional, gel-based electrochemical systems in wearable and smart electronics.
研究领域:
材料科学
·
电化学
·
能量存储
·
智能材料
·
柔性电子学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）