A novel polymer-derived method to prepare Eu-doped Si3N4 yellow phosphor. Issue 3 (April 2015)

• Record Type: Journal Article
• Authors: Li, Quan; Gong, Chaoyang; Cheng, Xuan; Zhang, Ying
• Is Part Of: Ceramics international. Volume 41:Issue 3(2015)Part A
• Page Start: 4227
• Page End: 4230
• Publication Date: 2015-04
• Subjects: A. Precursors: organic -- C. Optical properties -- D. Si3N4; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2014.11.032
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The yellow emission europium-doped silicon nitride (Si3 N4 :Eu) phosphor was prepared by a new and facile synthesis route via precursor formed by reacting solid polycarbosilane with europium acetylacetonate hydrate followed by nitridation and calcination of the precursor. This novel polymer-derived method utilized both distinctive polymer reaction and organic–inorganic transformation; accordingly, the amount of 4 wt% Eu mainly in the form of Eu 3+ was uniformly doped into Si3 N4 (α and β):Eu nanocrystallites at mild conditions. The double-exponential photoluminescence behavior with the decay time of 1.18 ns and 25.28 ns corresponding to the 4f 6 5d 1 −4f 7 transition of Eu 2+ and 4f–4f transition of Eu 3+, respectively, was observed with Si3 N4 (α and β):Eu when excited at 375 nm and emitted at 550 nm.