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  • Vol. 45  期 3, 2024 2024年 45卷 第3期
    • Cover Story

      YAN Xinxin,HU Yangxiang,WAN Ning,PANG Qi,CHEN Yibo

      DOI:10.37188/CJL.20230316
      摘要:Doping Mn2+ into the copper-based halide Cs3Cu2I5 is an important approach to broaden the luminescence performance. However, most of the reported doping methods require high temperature, inert atmosphere, long reaction time, and specialized equipment. In this work, by directly adding CsI powders into a hydroiodic acid solution of CuI and MnCl2, Mn2+-doped Cs3Cu2I5 microcrystals were rapidly synthesized at a relatively low temperature (60 ℃) under ambient air conditions within 3 minutes. Through a series of control experiments, we propose a “slow-release growth-doping” mechanism controlled by the solubility of the reactants. It is confirmed that the slow dissolution rate of CsI powders in a concentrated hydroiodic acid can reduce the growth rate of Cs3Cu2I5 crystals, providing favorable kinetic conditions for controllable Mn2+ doping. This work provides a new approach for the study of doping luminescence and doping kinetics in all-inorganic metal halide systems.  
      关键词:Mn2+ doping;Slow-release growth-doping;Cs3Cu2I5   
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      发布时间:2024-04-08
    • Synthesis and Properties of Materials

      CHEN Rui,LIU Rui,WANG Pengfei,LIN Hang,CHENG Yao,WANG Yuansheng

      DOI:10.37188/CJL.20230317
      摘要:Since the size-dependent up-conversion fluorescence thermal enhancement phenomenon was found in rare earth-activated nano-fluorescent materials, the development of materials with noteworthy fluorescence thermal enhancement effect has become a research hotspot. Recent explorations have found that the fluorescence thermal enhancement effect can be achieved in non-nanoscale fluorescent material systems and non-up-conversion luminescence processes, which will further expand the application scenarios of this interesting optical phenomenon. In this review, the latest research progress of rare earth-activated fluorescent thermal enhancement materials is summarized. The proposed mechanisms and potential applications of rare earth-activated fluorescent thermal enhancement materials are overviewed, and the research directions are outlooked.  
      关键词:rare earth activated luminescence materials;luminescence thermal enhancement;nanomaterials;up-conversion luminescence   
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      发布时间:2024-04-08
    • GONG Jian,CHEN Qian,LI Yang,MA Mengen,MA Yujiao,WU Shaohang,LIU Chong,MAI Yaohua

      DOI:10.37188/CJL.20230309
      摘要:The efficiency of perovskite solar cells has been improved to 26.1% in just ten years, which is very close to the certification efficiency of crystalline silicon solar cells (26.81%). This demonstrates the significant potential for industrialization. Currently, efforts are still being made to further enhance the efficiency of perovskite solar cells. However, various inseparable factors affect the performance of perovskite solar cells during the device preparation process. Traditional methods often rely on trial and error to optimize the preparation process, resulting in time-consuming procedures. Bayesian optimization, a global optimization algorithm, has achieved remarkable success in addressing artificial intelligence's black box problem. In this work, the Bayesian optimization is employed to optimize four key process parameters involved in the perovskite layer: excess percentage of lead iodide (PbI2), annealing temperature, annealing time, and vacuum extraction time. The costs of research and development have been significantly reduced, as well as the required time for such activities has also been shortened. The improvement was achieved through five rounds of experimental iterations and 34 sets of process conditions, ultimately resulting in the preparation of an inverse perovskite solar cell with a device efficiency rating of 23.56%.  
      关键词:perovskite solar cells;machine learning;process optimization;high efficiency   
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      发布时间:2024-04-08
    • LU Ziwei,LIU Yongfu,LUO Zhaohua,SUN Peng,JIANG Jun

      DOI:10.37188/CJL.20230325
      摘要:Near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) are expected to be the next-generation NIR light sources, which have the advantages of small size, broad bandwidth, and easy tuning of emission peaks. The key for NIR pc-LEDs is to develop highly efficient broadband NIR phosphors that can be effectively excited by blue light. LiScSi2O6∶Cr3+can be excited by blue light and emits NIR light peaked at 845 nm with a broad bandwidth of 156 nm and an internal quantum efficiency of 64.4%. Herein, Sc3+ is replaced by M ions (M = Ga3+, Lu3+, Y3+, Gd3+) to regulate the NIR luminescence. The introduction of M ions is easy to form heterogeneous phases or undergo phase transformation, thus reducing the NIR luminescence of the titled material. The regulation processes are analyzed based on the crystal structure.  
      关键词:LiScSi2O6∶Cr3+;cation substitution;crystal structure   
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      发布时间:2024-04-08
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