BRIGHT LUMINESCENCE OF FIRE RETARDANT ALUMINUM HYDROXIDE-SILICA SPHERE COMPOSITE

Ha-Sung Kong, Byoung-Ju Kim and Kwang-Sun Kang
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Ha-Sung Kong: Department of Fire Safety, Kyungil University, 50 Gamasilgil Hayangup Gyeongsan, Gyeongbuk 38428, South Korea
Byoung-Ju Kim: #x2020;Department of New and Renewable Energy, Kyungil University, 50 Gamasilgil Hayangup Gyeongsan, Gyeongbuk 38428, South Korea
Kwang-Sun Kang: #x2020;Department of New and Renewable Energy, Kyungil University, 50 Gamasilgil Hayangup Gyeongsan, Gyeongbuk 38428, South Korea

Surface Review and Letters (SRL), 2018, vol. 25, issue 06, 1-5

Abstract: Bright luminescence was achieved with excess amount of aluminum hydroxide with silica spheres. Various amounts of aluminum hydroxide were attached to silica spheres to improve the performance of fire retardancy. Although silica spheres attached with 60wt.% of AlCl3 (AlOH-A) showed no color change and luminescent chromophores, silica spheres attached with 80wt.% of (AlOH-B) and 100% of (AlOH-C) of AlCl3 changed the color and produced luminescent chromophores. The solution colors became intense yellow and brown for AlOH-B and AlOH-C, respectively, after 15 days. The FTIR spectra showed the characteristic absorption peaks of Al–OH and Si–O–Al. The concentration dependent photoluminescence (PL) intensities were continuously increased until 242mg addition of the colored solution and then slightly decreased thereafter for both AlOH-B and AlOH-C. The PL peaks shifted toward red by increasing the excitation wavelength for both AlOH-B and AlOH-C. Large Stoke shifts, such as 73 and 68nm for AlOH-B and AlOH-C, respectively, were observed.

Keywords: Photoluminescence; Al(OH)3; silica sphere; large Stokes shift (search for similar items in EconPapers)
Date: 2018
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DOI: 10.1142/S0218625X18501135

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