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Toward stable luminescence: Achieving hydration-independent silver nanoclusters in zeolites through Ag+/Zn2+ co-exchange and calcination.

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Title: Toward stable luminescence: Achieving hydration-independent silver nanoclusters in zeolites through Ag+/Zn2+ co-exchange and calcination.
Authors: Gao, Zhanyong1 (AUTHOR), Sun, Ling1 (AUTHOR), Huo, Zhengyang1 (AUTHOR), Li, Huanrong1 (AUTHOR) lihuanrong@hebut.edu.cn, Wang, Yige1 (AUTHOR) wangyige@hebut.edu.cn
Source: Ceramics International. Jun2026:Part A, Vol. 52 Issue 14, p23923-23930. 8p.
Subjects: Silver clusters, Zeolites, Heat treatment, Nanostructured materials, Light emitting diodes, Luminescence measurement, Fluorescence yield
Abstract: Zeolite-confined silver nanoclusters have attracted significant attention owing to their excellent photoluminescent properties. However, their practical application is severely hampered by the pronounced dependence of their luminescence color and quantum yield (PLQY) on the zeolite's hydration level. To address this critical limitation, we developed a facile calcination strategy to fabricate luminescent silver nanoclusters within LTA zeolites that exhibit exceptional emission stability, independent of environmental humidity. Specifically, calcining Ag+/Zn2+ co-exchanged zeolites at 700 °C in air yielded the sample Ag-LTA(Na/Zn)-700, which demonstrates bright yellow emission centered at 575 nm with a high PLQY of 60%. Remarkably, this sample retains its excellent photoluminescence stability even after prolonged immersion in water for over 168 h. We attribute this unprecedented humidity tolerance to a calcination-induced suppression of water adsorption, resulting from a drastic reduction in specific surface area, pore volume, and the concentration of hydrophilic silanol groups. Furthermore, by elevating the calcination temperature to 800 °C, we achieved white-light emission (PLQY ≈ 27%) from the resulting sample, Ag-LTA(Na/Zn)-800. This broad emission originates from multiple silver species, including Ag+ ions, [Ag 2 ]2+ pairs, and [Ag m ]n + clusters, which form concurrently with the collapse of the zeolite framework. Leveraging these advanced materials, we successfully fabricated high-performance yellow and white light-emitting diodes (LEDs). This study not only surmounts the key challenge of moisture sensitivity in silver-based zeolite phosphors but also establishes a versatile structural regulation paradigm for designing luminescent materials with tailored emission colors and enhanced stability for real-world applications. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Zeolite-confined silver nanoclusters have attracted significant attention owing to their excellent photoluminescent properties. However, their practical application is severely hampered by the pronounced dependence of their luminescence color and quantum yield (PLQY) on the zeolite's hydration level. To address this critical limitation, we developed a facile calcination strategy to fabricate luminescent silver nanoclusters within LTA zeolites that exhibit exceptional emission stability, independent of environmental humidity. Specifically, calcining Ag+/Zn2+ co-exchanged zeolites at 700 °C in air yielded the sample Ag-LTA(Na/Zn)-700, which demonstrates bright yellow emission centered at 575 nm with a high PLQY of 60%. Remarkably, this sample retains its excellent photoluminescence stability even after prolonged immersion in water for over 168 h. We attribute this unprecedented humidity tolerance to a calcination-induced suppression of water adsorption, resulting from a drastic reduction in specific surface area, pore volume, and the concentration of hydrophilic silanol groups. Furthermore, by elevating the calcination temperature to 800 °C, we achieved white-light emission (PLQY ≈ 27%) from the resulting sample, Ag-LTA(Na/Zn)-800. This broad emission originates from multiple silver species, including Ag+ ions, [Ag 2 ]2+ pairs, and [Ag m ]n + clusters, which form concurrently with the collapse of the zeolite framework. Leveraging these advanced materials, we successfully fabricated high-performance yellow and white light-emitting diodes (LEDs). This study not only surmounts the key challenge of moisture sensitivity in silver-based zeolite phosphors but also establishes a versatile structural regulation paradigm for designing luminescent materials with tailored emission colors and enhanced stability for real-world applications. [ABSTRACT FROM AUTHOR]
ISSN:02728842
DOI:10.1016/j.ceramint.2026.03.432