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Synthesis and characterization of luminescent properties of ceramics derived from polysilylcarbodiimides

Shimokawa, Yohei and Fujiwara, Akikazu and Ionescu, Emanuel and Mera, Gabriela and Honda, Sawao and Iwamoto, Yuji and Riedel, Ralf (2014):
Synthesis and characterization of luminescent properties of ceramics derived from polysilylcarbodiimides.
In: Journal of the Ceramic Society of Japan, The Ceramic Society of Japan, pp. 895-901, 122, (1430), ISSN 1882-0743,
[Online-Edition: http://dx.doi.org/10.2109/jcersj2.122.895],
[Article]

Abstract

The luminescence properties related to the thermal polymer/ceramic conversion behavior of silicon dicarbodiimide {SDC, [Si(N=C=N)2]n} have been investigated. SDC was synthesized by the non-oxidic sol–gel condensation reaction of silicon tetrachloride with bis(trimethylsilyl)carbodiimide. As-synthesized SDC showed no luminescence under UV light, while heat-treated SDC showed an appreciable photoluminescence (PL) and the maximum visible PL emission intensity was achieved by heat treatment at 400°C. Even after the heat treatment up to 970°C, the SDC preserved most of the N=C=N groups to keep whitish gray color without distinct free carbon formation, and emitted visible blue luminescence. The 400°C-heat treated SDC exhibited the intense luminescence excited at 281 and 379 nm wavelengths, while there was no PL emission excited by the N=C=N group-derived host absorption at 214 nm. The PL properties of the heat-treated SDCs could be correlated with their preservation of the local structure including N=C=N groups and defects formation during the heat treatment. Moreover, Eu3+-modified SDC was prepared by the same sol–gel method using Eu(III) chloride as the Eu3+-source. The results of FT-IR and 29Si NMR spectroscopic analyses revealed a complex formation between the Eu(III) chloride and bis(trimethylsilyl)carbodiimide. As a result, the Eu3+-modified SDC exhibited a characteristic PL red emission at around 600 nm attributed to the f-f-transition of Eu3+.

Item Type: Article
Erschienen: 2014
Creators: Shimokawa, Yohei and Fujiwara, Akikazu and Ionescu, Emanuel and Mera, Gabriela and Honda, Sawao and Iwamoto, Yuji and Riedel, Ralf
Title: Synthesis and characterization of luminescent properties of ceramics derived from polysilylcarbodiimides
Language: English
Abstract:

The luminescence properties related to the thermal polymer/ceramic conversion behavior of silicon dicarbodiimide {SDC, [Si(N=C=N)2]n} have been investigated. SDC was synthesized by the non-oxidic sol–gel condensation reaction of silicon tetrachloride with bis(trimethylsilyl)carbodiimide. As-synthesized SDC showed no luminescence under UV light, while heat-treated SDC showed an appreciable photoluminescence (PL) and the maximum visible PL emission intensity was achieved by heat treatment at 400°C. Even after the heat treatment up to 970°C, the SDC preserved most of the N=C=N groups to keep whitish gray color without distinct free carbon formation, and emitted visible blue luminescence. The 400°C-heat treated SDC exhibited the intense luminescence excited at 281 and 379 nm wavelengths, while there was no PL emission excited by the N=C=N group-derived host absorption at 214 nm. The PL properties of the heat-treated SDCs could be correlated with their preservation of the local structure including N=C=N groups and defects formation during the heat treatment. Moreover, Eu3+-modified SDC was prepared by the same sol–gel method using Eu(III) chloride as the Eu3+-source. The results of FT-IR and 29Si NMR spectroscopic analyses revealed a complex formation between the Eu(III) chloride and bis(trimethylsilyl)carbodiimide. As a result, the Eu3+-modified SDC exhibited a characteristic PL red emission at around 600 nm attributed to the f-f-transition of Eu3+.

Journal or Publication Title: Journal of the Ceramic Society of Japan
Volume: 122
Number: 1430
Publisher: The Ceramic Society of Japan
Uncontrolled Keywords: Non-oxidic sol–gel condensation reaction, Polymer derived ceramics, Photoluminescence, Silicon dicarbodiimide, Eu3+ complex
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
Date Deposited: 06 Nov 2014 13:23
Official URL: http://dx.doi.org/10.2109/jcersj2.122.895
Identification Number: doi:10.2109/jcersj2.122.895
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