Effect of cooling rate on the microstructure and luminescence properties of Sr2MgSi2O7:Eu2+, Dy3+ materials. (5th June 2017)

• Record Type: Journal Article
• Authors: Hai, Ou; Jiang, Hongyi; Zhang, Qiang; Ren, Qiang; Wu, Xiulan; Hu, Jieliang
• Is Part Of: Luminescence. Volume 32:Number 8(2017)
• Page Start: 1442
• Page End: 1447
• Publication Date: 2017-06-05
• Subjects: afterglow properties -- cooling rate -- grain surface -- luminescence properties -- phosphor; Luminescence -- Periodicals; Bioluminescence -- Periodicals; Chemiluminescence -- Periodicals; Luminescence -- Periodicals; 535.35
• DOI: 10.1002/bio.3343
• Languages: English
• ISSNs: 1522-7235

Abstract

Abstract: Sr2 MgSi2 O7 :Eu 2+, Dy 3+ long afterglow materials were prepared by a high‐temperature solid‐state reaction method with different cooling rates. The cooling rate had a slight effect on X‐ray diffraction patterns and photoluminescence performance, but significantly modified the grain boundaries and long afterglow properties of the Sr2 MgSi2 O7 :Eu 2+, Dy 3+ materials. When the cooling rate was 1°C/min, grains remained intact with clear grain boundaries. As the cooling rate increased from 1°C/min to 5°C/min, some grain boundaries became indistinguishable. The afterglow properties were optimized, presenting best performance at the cooling rate of 3°C/min. The trap state was investigated and illustrated through thermoluminescence curves. The depths of the traps of all the samples were unchanged, whereas densities changed to a large extent, leading to different afterglow properties. The retrapping process is discussed based on the afterglow curves.