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Advanced Luminescent Materials: Synthesis, Properties and Applications

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Optical and Photonic Materials".

Deadline for manuscript submissions: 20 June 2024 | Viewed by 1385

Special Issue Editors

Department of Applied Biology and Chemical Technology, Hong Kong Polytechnic University, Hong Kong, China
Interests: advanced functional materials; luminescent transition-metal complexes; organic semiconductors; π-conjugated compounds; organic electronics
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Guest Editor
Jiangxi Key Laboratory of Nanobiomaterials, East China Jiaotong University, Nanchang 330013, China
Interests: advanced polymer materials; phosphorescent polymers; biomedical engineering; tumor therapy; biosensing and bioimaging

Special Issue Information

Dear Colleague, 

Recently, novel advanced luminescent materials, including triplet emitters (e.g., luminescent transition-metal complexes (LTMCs) and thermally activated delayed fluorescent (TADF) materials) and doublet emitters (e.g., organic radicals, rare-earth complexes), have played a crucial role in the development of advanced photofunctional materials. Owing to their diverse structural/molecular design, structural diversity, and rich photophysical properties, these luminescent materials have attracted extensive attention, and have been widely and wisely used in the fields of photocatalysis, electroluminescence, organic solar cells, biological sensing and imaging, photodynamic therapy, etc. Chemists can design and prepare a wide variety of photofunctional materials. Structural studies of these materials revealed the presence of novel photophysical phenomena, allowing a deeper understanding of the structure–property relationships and extending their potential applications. This Special Issue on “Advanced Luminescent Materials: Synthesis, Properties and Applications” should become a timely status report summarizing and showcasing the fundamental progresses and practical advancements in recent years.

Dr. Peng Tao
Dr. Zejing Chen
Guest Editors

Manuscript Submission Information

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Keywords

  • luminescent transition-metal complex
  • thermally activated delayed fluorescent material
  • biosensing and bioimaging
  • phosphorescent polymers
  • rare-earth complexes
  • tumor therapy
  • organic radicals
  • electroluminescence, organic solar cells
  • stimuli-responsive materials

Published Papers (2 papers)

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Research

12 pages, 7962 KiB  
Article
Fixed Yellow-to-Blue Intensity Ratio of Dy3+ in KY(CO3)2 Host for Emission Color Tuning
by Lei Huang, Jian Qian, Shijian Sun and Dechuan Li
Materials 2024, 17(6), 1438; https://doi.org/10.3390/ma17061438 - 21 Mar 2024
Viewed by 477
Abstract
Dy3+, Ce3+ co-doped KY(CO3)2 phosphors with a monoclinic structure were synthesized using the hydrothermal method to create a fixed yellow-to-blue ratio emission. The [YO8] polyhedron, consisting of a Y atom and eight oxygen atoms, forms [...] Read more.
Dy3+, Ce3+ co-doped KY(CO3)2 phosphors with a monoclinic structure were synthesized using the hydrothermal method to create a fixed yellow-to-blue ratio emission. The [YO8] polyhedron, consisting of a Y atom and eight oxygen atoms, forms a relatively independent microstructure within the KY(CO3)2 host. Y3+ ions are partially replaced by Ce3+ or Dy3+ ions to construct the [CeO8] or [DyO8] polyhedral fluorescence emission unit. The spectral measurements indicate that Ce3+ and Dy3+ can maintain relatively independent fluorescence emission characteristics in the KY(CO3)2 host. The yellow-to-blue intensity ratio of Dy3+ remains close to 1 and does not change with the variation in the doping concentration of KY(CO3)2:Dy3+ and KY(CO3)2:Dy3+,Ce3+ phosphors. When Ce3+ and Dy3+ are co-doped with KY(CO3)2, the emission intensities of Dy3+ under 339 nm and 365 nm excitation increase by 8.43 and 2.32 times, respectively, through resonance energy transfer and cross-relaxation. All Ce3+-doped KY(CO3)2:Dy3+ phosphors can emit white light. Among them, the emitted light of KY(CO3)2:3%Dy3+,5%Ce3+ is closest to standard daylight. Therefore, a stable [YO8] polyhedral structure can be used to achieve more color tuning of light. Full article
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17 pages, 7958 KiB  
Article
Luminescence Properties of an Orthorhombic KLaF4 Phosphor Doped with Pr3+ Ions under Vacuum Ultraviolet and Visible Excitation
by Patrycja Zdeb, Nadiia Rebrova, Radosław Lisiecki and Przemysław Jacek Dereń
Materials 2024, 17(6), 1410; https://doi.org/10.3390/ma17061410 - 19 Mar 2024
Viewed by 703
Abstract
Fluorides have a wide bandgap and therefore, when doped with the appropriate ions, exhibit emissions in the ultraviolet C (UVC) region. Some of them can emit two photons in the visible region for one excitation photon, having a quantum efficiency greater than 100%. [...] Read more.
Fluorides have a wide bandgap and therefore, when doped with the appropriate ions, exhibit emissions in the ultraviolet C (UVC) region. Some of them can emit two photons in the visible region for one excitation photon, having a quantum efficiency greater than 100%. In a novel exploration, praseodymium (Pr3+) ions were introduced into KLaF4 crystals for the first time. The samples were obtained according to a high-temperature solid-state reaction. They exhibited an orthorhombic crystal structure, which has not been observed for this lattice yet. The optical properties of the material were investigated in the ultraviolet (UV) and visible ranges. The spectroscopic results were used to analyze the Pr3+ electronic-level structure, including the 4f5d configuration. It has been found that KLaF4:Pr3+ crystals exhibit intense luminescence in the UVC range, corresponding to multiple 4f → 4f transitions. Additionally, under vacuum ultraviolet (VUV) excitation, distinct transitions, specifically 1S01I6 and 3P03H4, were observed, which signifies the occurrence of photon cascade emission (PCE). The thermal behavior of the luminescence and the thermometric performance of the material were also analyzed. This study not only sheds light on the optical behavior of Pr3+ ions within a KLaF4 lattice but also highlights its potential for efficient photon management and quantum-based technologies. Full article
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