摘要
采用高温固相法制备了Y2O2S∶Eu,Mg,Ti,Gd红色长余辉材料,研究了热处理工艺对材料稳定性的影响。用X射线衍射表征该材料的相组成,用激发光谱、发射光谱、余辉亮度对材料的发光性能进行表征。结果表明:热处理温度在600℃以下时,材料的发光性能不变;当热处理温度达到800℃时,发光性能缓慢下降;当热处理温度达到1 000℃时,主晶相Y2O2S变成Y2O2SO4和Y2O3,发光性能急剧下降。与铝酸盐及硫化物发光材料相比,Y2O2S∶Eu,Mg,Ti,Gd红色长余辉材料具有较好的热稳定性。
In this paper, red afterglow phosphor Y2O2S： Eu, Mg, Ti, Gd was prepared by solid state reaction method and the thermal stability was studied in detail. The obtained phosphor compositions were characterized by X-ray diffraction （XRD）. Luminescent properties were investigated by measuring emission spectra, excitation spectra and deeay curves. When the heating temperature rises from 200 to 600℃, the major phase is V202S and the luminescent properties are almost unehanged. When the heating temperature is 800℃ , the Y2O2SO4 and Y2O3 phase are observed. The peak position and peak pattern of emission spectrum are unchanged, but the intensity of emission spectrum is decreased. The excitation speetrum shows the same varia- tion regularity. The relative intensity at 5 min （after the excitation source was turn off） is decreased to 80% compared with the one without heating process. When the heating temperature is inereased to 1 000 ℃, the major phase is changed to Y2O2SO4 and Y2O3 , the intensity of emission spectrum is very low. The afterglow phenomenon almost disappears. The thermal stability of Y2O2S： Eu, Mg,Ti,Gd phosphor is better than that of sulfide and aluminates＇ phosphors. Thus, the Y2O2S： Eu, Mg,Ti,Gd phosphor is a promising candidate of red afterglow luminescent material which ean resistant to higher temperature environment.
出处
《发光学报》
EI
CAS
CSCD
北大核心
2011年第2期122-126,共5页
Chinese Journal of Luminescence
基金
中央高校基本科研业务专项基金(2010-ZY-CL-021)资助项目
关键词
长余辉
硫氧化物
热稳定性
发光材料
long afterglow
oxsulfide
thermal stability
luminescent material
