BaMgAl_(10)O_(17):Eu^(2+)蓝色荧光粉热劣化中色坐标y值漂移

Mechanism of chromaticity y-value shift during thermal degradation of BaMgAl_(10)O_(17):Eu^(2+) phosphor

采用高温固相法制备了不同Eu2+离子含量的BaMgAl10O17:Eu2+(BAM)荧光粉,研究了Eu2+离子含量对BAM荧光粉热劣化的影响,及BAM荧光粉分别在空气中及Ar气中经不同温度及热处理工艺处理后的色坐标y值变化情况.结果发现热劣化后y值的漂移取决于热劣化温度,与Eu2+含量关系不大.当经温度为400℃附近的热劣化后,y值出现上升,而经600℃或更高温度劣化后,y值出现下降.非氧化性气氛中,热劣化导致的y值变化能通过热处理进行回复.BAM荧光粉在无氧的条件下也会发生热劣化现象,Eu2+离子晶体格位的迁移导致了y值的漂移,氧能明显加剧热劣化程度.

BaMgAl10O17 ：Eu^2＋ （BAM）phosphor with different concentration of Eu^2＋ ions were prepared by high temperature solid-state reaction method. The dependence of thermal degradation of BAM phosphor on Eu^2 ＋ ions concentration was studied base on the shift of y-value after thermal treating under different temperatures in air and argon atmosphere. The shift of y-value after thermal degradation is not due to Eu^2＋ions concentration but rather depends on thermal treating temperature. The y-value increases after baking at around 400 ℃ but decreases at 600 ℃ or higher temperatures. The thermal degradation is obviously aggravated in oxidative atmosphere. The shift of y-value is reversible when thermal treated in non-oxidative atmosphere. Thermal degradation of BAM can happen in nonoxidative atmosphere. It is considered that the mechanism of thermal degradation of BAM phosphor is firstly due to the migration of Eu^2＋ ions and then the effect of oxygen.