Effect of silicon powder content in starting materials on the phase and luminescence properties of SrSi2O2N2:Eu2+ phosphors

• Published in: Journal of materials science. Materials in electronics 2017-09, Vol.28 (17), p.12551-12554
• Main Authors: Li, XuCheng, Deng, ChaoYong, Long, Fei, Li, LiangRong, Huang, WeiChao
• Format: Article
• Language: English
• Subjects: Carbon dioxide; Characterization and Evaluation of Materials; Chemistry and Materials Science; Decomposition; Fluorescence; High temperature; Luminescence; Materials Science; Nitrogen; Optical and Electronic Materials; Optical properties; Phosphors; Silicon dioxide; Silicon nitride; X-ray diffraction
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-017-7078-0

SrSi 2 O 2 N 2 :Eu 2+ phosphors were prepared by a high temperature solid-state reaction method from the Eu 2 O 3 –SrCO 3 –Si 3 N 4 –Si system. The phase characteristics and luminescence properties of the samples synthesized with various starting composition of silicon powder were investigated in detail by mean of X-ray diffraction and fluorescence spectrophotometer analysis. Single-phase SrSi 2 O 2 N 2 :Eu 2+ was successfully obtained avoiding the formation of an unknown phase, which usually exists from Eu 2 O 3 –SrCO 3 –Si 3 N 4 –SiO 2 system. The comparison of different composition of starting materials [Si:Si 3 N 4  = (1.5 +  x )/3:(0.5− x ) ( x  = 0, 0.1, 0.2, 0.3, 0.4, 0.5)] indicates that different silicon powder content in starting materials plays an crucial role in phase and luminescence properties of SrSi 2 O 2 N 2 . The XRD diffraction intensity ratio of nitrogen-rich phase/oxygen-rich phase is increasing regularly with increasing x values in different starting composition of Si:Si 3 N 4  = (1.5 +  x )/3:(0.5− x ) ( x  = 0, 0.1, 0.2, 0.3, 0.4, 0.5). The emission intensity of the samples is gently enhanced with the increasing Si:Si 3 N 4 . This demonstrates that the SiO originated in the reaction of Si and CO 2 is superior to SiO 2 for preparation of SrSi 2 O 2 N 2 :Eu 2+ .