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Shaping Properties of SrS:Ce Phosphor by Processing Parameters

发布时间: 2015-04-13 08:15 | 【 【打印】【关闭】

  学 术 报 告 

时间:414日 (星期二)下午15:00    

地点:四号楼14层第一会议室  

Shaping Properties of SrS:Ce Phosphor by Processing Parameters 

Prof. Eugeniusz Zych 

Faculty of Chemistry, University of Wroclaw, Poland, 14F. Joliot Curie Street, 50-383 Wroclaw, Poland  

   Wroclaw Research Centre EIT+, Poland, 147 Stablowicka Street, 54-066 Wroclaw, Poland  

  Abstract: 

  SrS:Ce is a known luminescent material with a high brightness emission in the 450-600 nm region and peaking around 480 nm.  Our experiments on sintered SrS:Ce pellets revealed that a new emission centrum appeared with luminescence in the range of 570-800 nm, see Fig. 1.  The emission has all the characteristics of Ce3+ luminescence.  Thus, the red luminescence band is composed of two components separated by about 2200 cm-1, which matches the splitting of the 2F5/2 and 2F7/2 states.  Also the luminescence decay time reaching 35 ns at 25 K is typical for Ce3+. It gets shorter with increasing temperature and at RT the red emission is already noticeably quenched.  The excitation features of both emissions, the regular bluish-green and the irregular red-infrared one, are very much separated and altogether cover the whole range of 200-450 nm range of wavelengths.  Temperature dependence of the luminescence characteristics will be discussed together with the possible structure of the irregular Ce3+ luminescent center.   

  联系人: 结构陶瓷与复合材料工程中心  王士维 研究员(52414320