Sr2 MgSi2 O7∶Eu2＋,Dy3＋存在热稳定性不好、热劣化机理不明确的问题,为了探讨其热劣化机理,在不同温度下对其进行热处理,表征了余辉性能和光谱性质,研究了热处理温度对余辉性能和发射强度的影响。结果表明,当热处理温度低于600℃时,余辉性能变化不明显,发射强度随热处理温度升高而缓慢降低；而高于600℃的热处理温度可以使余辉性能显著劣化,且随热处理温度的升高,发射强度呈现先增大后减小趋势,并在900℃附近出现极大值。上述余辉性能劣化和发射强度变化的根本原因是陷阱能级捕获电子能力的减弱,在此基础上提出了Sr2 MgSi2 O7∶Eu2＋,Dy3＋热劣化的陷阱能级受热破坏机理。
The thermal degradation is one of the key problems that restricting the working properties and applied range of Sr2 MgSi2 O7∶Eu2+,Dy3+ long afterglow luminescent materials.To clarify the thermal degradation mechanism of Sr2 MgSi2 O7∶Eu2+,Dy3+,a heat-treatment process at different temperature was carried out,the afterglow properties and luminescent spectra were characterized,and the effects of heat-treatment temperature on the afterglow properties and luminescent intensity were studied.The results revealed that the afterglow properties had no significant change,and the emission intensity decreased with the increasing temperature, when the heat-treatment temperature was lower than 600 ℃.The afterglow properties degraded significantly when the heat-treatment temperature was higher than 600 ℃,and the emission intensity increased at first then decreased with the increasing temperature.A maximum value was reached at a temperature of 900 ℃.The root cause of these phenomena was the weaken capacity on electron capture of trap level.Based on the relationship of afterglow property degradation and emission intensity changes,a thermal degradation mechanism about the heat damage of trap level was proposed.
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