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  • Vol. 45  期 8， 2024 2024年 45卷 第8期

    • Cover Story

      “最新研究发现，金属卤化物钙钛矿发光二极管（PeLEDs）在照明和显示领域具有巨大潜力。英国伦敦大学研究团队通过结构优化，结合微腔结构，显著提升了准二维钙钛矿红光PeLEDs的外量子效率，为护眼红光PeLEDs的实现提供了新方案。”

      ZHANG Yunjie,LI Xiaodan,GUO Xiaoyang,LIU Xingyuan

      DOI：10.37188/CJL.20240120
      摘要：Metal halide perovskite light-emitting diodes （PeLEDs） have wide color gamut and high color purity， with broad application prospects in lighting and displays. A groundbreaking study by a research team at the University of London published in Scientific Reports found that exposure to red light for just 3 minutes a day could significantly alleviate vision decline. The tunability of perovskite’s spectrum and its high color purity provide assurance for the realization of eye-protective red-emitted PeLEDs. Unlike previous interface engineering or ligand engineering methods， this paper proposes a new approach to enhance the external quantum efficiency （EQE） of quasi-two-dimensional perovskite red PeLEDs by combining them with microcavity structures to achieve narrower linewidths in electroluminescent devices. The results show that by integrating distributed Bragg reflectors （DBRs） with PeLEDs， narrow linewidth high-performance PeLEDs based on microcavity structures were designed and fabricated， achieving a doubling of EQE on top of narrowing the electroluminescence （EL） full width at half maximum for microcavity PeLEDs， with a maximum EQE reaching 11.26%. Compared to reference devices prepared under the same conditions， PeLED devices with microcavity structures narrowed their EL linewidth to one-third that of reference devices， only 11 nm.  
      关键词：quasi-two-dimensional perovskite;distributed bragg mirror;red emitted;electroluminescence;half-height full width   
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    • Expert Perspectives

      “在材料科学领域，人工智能技术的应用为发光材料的研制带来了新突破。通过数据驱动方法，研究人员能高效筛选和设计新材料，推动材料创新。本文综述了数据驱动发光材料研究的前沿进展，为解决高质量数据匮乏等问题提供了解决方案。”

      HUANG Lin,XIE Rongjun

      DOI：10.37188/CJL.20240098
      摘要：Artificial intelligence has been bringing a great of convenience for human in manufacture， life， science and technology， for its abilities of efficient data analyses， accurate prediction， automatic task executing， and personalized service. Machine learning and high-throughput computing have extensively permeated and successfully applied in the field of materials， opening up new horizons for innovative research and design methods in luminescent materials. By employing efficient algorithms for mining and processing large-scale data， the screening and design process of new materials is accelerated， thereby driving the discovery and application progress of novel materials. This article provides an overview of the recent advances in data-driven research on luminescent materials. Based on relevant research cases， it outlines the entire process of data-driven material research and elaborates on the importance and implementation strategies of data acquisition in the development of luminescent materials. It also conducts a thorough analysis of how to accurately extract core features that characterize material performance， while exploring algorithm selection strategies applicable to the field of luminescent materials. Finally， the bottleneck of the current research on data-driven luminescent materials is pointed out， such as a lack of high-quality data and difficulties in constructing complex structure-performance correlation models. It also provides an outlook on future development directions， with a particular emphasis on the construction of luminescent material database platforms， implementation of high-throughput experiments， and establishment of corresponding data production standards.  
      关键词：data-driven;luminescent materials;machine learning;high-throughput computing;Luminescent Materials Data Fab   
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    • Invited Review

      “飞秒激光激发二维半导体产生相干声学声子，为无损检测发光器件提供新方法，具有重要科学与社会价值。”

      XU Wenxiong,ZHANG He,CUI Qiannan,XU Chunxiang

      DOI：10.37188/CJL.20240123
      摘要：The coherent acoustic phonons generated by femtosecond laser pulse excitation of thin-film materials can obtain non-destructive interface structure characteristics of light-emitting materials and devices. It is important for non-destructive testing and imaging of functional interfaces of opto-electronic devices. Compared with traditional metal thin-film photoacoustic transducers with thermoelastic mechanisms， two-dimensional semiconductor films own the advantages of broad spectrum absorption， atomic-level surface flatness， and robust control of the layer number. During the interaction of femtosecond laser pulse and two-dimensional semiconductor， coherent acoustic phonon oscillation can be generated， which set a foundation for further launching ultrafast acoustic pulses to extract interface information. This should be widely applicable for nondestructive evaluation of defect distribution， mechanical properties， and interface quality of light-emitting devices. In this paper， we introduce the research progress of coherent acoustic phonons in two-dimensional semiconductors and overlook the scientific significance of ultrafast opto-acoustic measurement technique.  
      关键词：Two-Dimensional Semiconductor;Hetero-Interface;Coherent Acoustic Phonons   
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    • “荧光碳点在发光领域取得显著进展，本文总结了其在电致发光器件的最新研究，为实现高性能器件提供策略和展望。”

      YU Zhenzhen,REN Zheng,LI Cong,WU Zepeng,WANG Dawei,GUAN Li,LI Xu

      DOI：10.37188/CJL.20240102
      摘要：Fluorescent carbon dots （CDs） have excellent characteristics such as wide range of raw materials， non-toxic and non-polluting， adjustable luminescence color， low cost and biocompatibility， and have broad application prospects in the field of luminescence. In recent years， CDs-based electro-luminescent devices have a great achievements. In this paper， we mainly summarize the latest progress of CDs-based electroluminescent devices， even focus on the feasibility of synthesizing high-efficiency CDs and manipulating the device structure to obtain high-performance devices. In addition， combined with the analysis of the development status and future needs of CDs in the application of electroluminescent devices， this paper looks forward to the realization of high-performance CDs-based electroluminescent devices.  
      关键词：carbon dots;Electroluminescent;LED;performance;all solution   
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