学 术 报 告 

时间：4月14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 ²F_5/2 and ²F_7/2 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）