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  • Vol. 45  期 7， 2024 2024年 45卷 第7期

    • Cover Story

      “最新研究突破：单电极电致发光纤维，通过无线驱动实现可视化传感，具有低成本、高灵敏度和柔软性，为智能穿戴和生物检测领域带来创新应用。”

      YANG Xiaorui,YANG Weifeng,LI Kerui,LI Yaogang,ZHANG Qinghong,WANG Hongzhi,HOU Chengyi

      DOI：10.37188/CJL.20240067
      摘要：The advent of flexible electronics， smart sensors， and intelligent wearables has catalyzed a burgeoning interest in flexible electroluminescent devices. These devices， particularly electroluminescent fibers， are distinguished by their portability， malleability， and integrability into textiles， offering substantial promise for advancements in visual sensing technology. However， due to their mostly dual-electrode structure and complex fabrication process， there are still shortcomings in terms of cost， device uniformity， sensitivity， and flexibility. This paper develops a single-electrode electroluminescent fiber and achieves continuous preparation of electroluminescent fibers through a simple， scalable， and low-cost manufacturing process. Electroluminescence is achieved through wireless driving. The single-electrode fiber receives energy from the wireless radio field and forms a closed loop with the wireless transmission source through the ground wire to the earth， thus eliminating the dependence on external power sources. The single-electrode electroluminescent fiber consists of a conductive layer， a dielectric layer， and a luminescent layer， with a luminescent wavelength of 456 nm. It has good mechanical performance， luminescent performance， and flexibility. We applied it to the visualization sensing of solutions， and its luminescent intensity can achieve a recognition degree of 0.001% （mass fraction） for sodium chloride concentration， demonstrating excellent sensitivity and significant implications for sweat detection and biology. We further weaved it into luminescent fabrics， which have comparable breathability and mechanical properties to ordinary commercial fabrics and can achieve visual sensing of different concentrations of sodium chloride. In the domain of wearable technology， wirelessly driven single-electrode electroluminescent fibers have enormous potential to achieve visual display and communication functions.  
      关键词：intelligent fibers;visual sensing;continuous preparation;wireless driving   
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      更新时间：2024-04-30

    • Synthesis and Properties of Materials

      “最新研究进展显示，溶胀法在制备荧光微球领域具有调控性强、操作简单等优势。专家深入探讨了溶胀法的基本原理、步骤及影响因素，为优化荧光微球性能提供了改进策略，展望了其应用前景。”

      CHEN Hongjian,YUAN Yuwen,LING Shisheng,CHEN Dong,QIAO Xusheng,DONG Yubing,FAN Xianping

      DOI：10.37188/CJL.20240079
      摘要：Swelling method is widely used as a method for preparing fluorescent microspheres with strong controllability， simple operation and high practicability. This paper reviews the research progress of preparing fluorescent microspheres by swelling method， expounds the basic principle and steps of preparing fluorescent microspheres by swelling method.It further summarizes the common factors affecting the performance of microspheres during swelling process， such as the types of polymer matrix， fluorescent substance and swelling agent. The improvement strategy of swelling method for optimization of fluorescent microspheres is summarized， and the application prospect of fluorescent microspheres prepared by swelling method is prospected.  
      关键词：swelling method;fluorescent microspheres;research progress;luminous enhancement   
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      更新时间：2024-05-11
    • “在红光放大自发辐射领域，研究者通过A位取代和表面钝化，实现了Cs0.7FA0.3PbI2Br钙钛矿薄膜的低阈值和高稳定性，为红光激光应用提供了新方案。”

      WANG Liang,YAN Mengtong,LI Yan,LYU Mei,LU Hongbo,ZHU Jun

      DOI：10.37188/CJL.20240075
      摘要：Lead halide perovskite has shown great potential as a new generation of optoelectronic materials due to its adjustable optical band gap， high luminous color purity， high carrier mobility， and solution-processibility. Currently， amplified spontaneous emission （ASE） and laser have been realized in the blue， green， red， and even infrared ranges for perovskite material. As a red light-emitting optical gain medium， CsPbI2Br perovskite material has good thermal stability and a suitable optical band gap and has attracted extensive attention from researchers. However， CsPbI2Br films prepared by the solution method are prone to phase transition in high-humidity environments， and there are many defects in the films， which hinder their further development. To improve the phase stability of CsPbI2Br perovskite films， the A-site is partially substituted by FA+（CH4N2+） in this work. The tolerance factor of the perovskite structure is increased after FA+ substitution， which can effectively improve the phase stability of the perovskite films. Meanwhile， the morphology and crystallinity of the perovskite films are improved. To reduce the non-radiative recombination caused by the surface defects， polymethyl methacrylate （PMMA） is used to passivate the surface of the perovskite films. The C==O bond in PMMA can effectively bind to the undercoordinated Pb2+ on the surface of perovskite， resulting in a good defect passivation effect and effective inhibition of non-radiative recombination. Thanks to the improvement of the film morphology caused by FA+ cation and the PMMA passivation， a low-threshold， 15 μJ/cm2 under nanosecond laser excitation is achieved for the red ASE of the Cs0.7FA0.3PbI2Br perovskite film. At the same time， the film has good hydrophobicity and photostability. Under the air humidity environment （RH （40 ± 10）%）， the ASE intensity remains at 93% of its initial value after a pulsed laser irradiation of 3 000 μJ/cm2 for 120 min. This work provides a reference for realizing low-threshold and high-stability red ASE and laser.  
      关键词：perovskite;amplified spontaneous emission;cationic substitution;Defect passivation   
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      更新时间：2024-05-06
    • “最新研究突破：室温下成功制备发光性能优异的双相CsPbBr3/Cs4PbBr6钙钛矿纳米晶复合薄膜，显著提高水稳定性和空气稳定性，成功应用于白光LED器件。”

      JIANG Dongliang,ZHANG Guoxing,ZHU Xinghua,LI Yuan,CHEN Yan

      DOI：10.37188/CJL.20240081
      摘要：Synthesis of all-inorganic CsPbX3 （X=Cl， Br， I） perovskite nanocrystals （PNCs） typically requires high-temperature conditions and the involvement of inert gases， which severely hinders their practical application. In this work， a room-temperature method using a 2-methylimidazole ligand to regulate recrystallization was first employed to successfully prepare biphase CsPbBr3/Cs4PbBr6 PNCs with superior luminescent properties. Subsequently， these nanocrystals were combined with various polymers to fabricate nanocrystal composite films. The biphase perovskite structure within the polymers was confirmed through XRD， TEM， and UV-Vis absorption spectroscopy. The CsPbBr3/Cs4PbBr6@PDMS and CsPbBr3/Cs4PbBr6@EVA composite films were identified as having excellent overall performance， and they were encapsulated in LED devices. With dual protection from Cs4PbBr6 PNCs and the polymers， the CsPbBr3/Cs4PbBr6@PDMS exhibited a photoluminescence quantum yield （PLQY） exceeding 80%， while the water stability and air stability of CsPbBr3/Cs4PbBr6@EVA were significantly enhanced. Finally， the CsPbBr3/Cs4PbBr6@EVA composite film was successfully applied to white LED devices， emitting standard white light with a CIE chromaticity coordinate of （0.331， 0.332）.  
      关键词：ligand regulation;CsPbBr3/Cs4PbBr6;composite film;white LED device   
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      更新时间：2024-07-25
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