Composition-dependent properties of Ca-α-SiAlON:Eu²⁺ phosphors prepared by combustion synthesis

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• 作者：Yiyao Ge^a ; ¹ ; Jie Zhang^a ; ¹ ; Ying Chen^a ; Siyuan Sun^a ; Zhaobo Tian^a ; Zhipeng Xie^a ; ^{xzp@mail.tsinghua.edu.cn} ; Qi Wang^b ; ^{wangqi15@ustb.edu.cn}
• 关键词：Combustion synthesis ; Eu2+ doped ; Ca-α-SiAlON phosphors ; Composition
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：15 February 2017
• 年：2017
• 卷：43
• 期：3
• 页码：2933-2937
• 全文大小：697 K
• 卷排序：43

文摘

Herein, we put forward a simple combustion synthesis strategy for the highly efficient preparation of Eu-doped Ca-α-SiAlON yellow phosphors with different composition of Ca(m/2−x)EuxSi12−m-nAlm+nOnN16−n. The as-synthesized phosphors were endowed with outstanding photoluminescence behavior of yellow emission peaking at ~580 nm under excitation of near-ultraviolet (UV) or blue light. In the designed experiments, products with different compositions, which were determined by the varying m and n values, were obtained by adjusting the proportion of starting reactants. Further, the dependence of composition on the overall properties of products was systematically studied. It was found that the m and n values could have distinct impact on the phase composition, microstructure and photoluminescence properties of as-synthesized phosphors. The most prominent enhancement of spectral intensity was achieved in the sample with composition of m=1.5 and n=0.8 in this research system. The resultant Ca-α-SiAlON:Eu2+ phosphors were simultaneously featured with high purity, favorable uniformity and equiaxial morphology. A continuous red shift phenomenon in emission wavelength with the increase of m value and an inverse blue shift with the increase of n value were both observed and rationally uncovered.