宽带激发BaBi_(2)(MoO_(4))_(4):Eu^(3+)荧光粉的制备与发光性能

Preparation and Luminescence Properties of Broadband Excited BaBi_(2)(MoO_(4))_(4):Eu Phosphor

Eu^(3+)激活红色荧光粉由于光吸收较弱从而限制了其应用,虽然在BaBi_(2)(MoO_(4))_(4):Eu^(3+)荧光粉中实现了宽带激发的目的,但是对其结构及其发光机理还需进一步研究,同时还需进一步提高其光吸收强度。为此,采用固相法在不同的温度下制备了BaBi_(2)(MoO_(4))_(4):Eu^(3+)红色荧光粉,通过掺杂Sr^(2+)离子和Y^(3+)离子探讨结构变化和Bi^(3+)离子的分布对BaBi_(2)(Mo O_(4))_(4):Eu^(3+)发光性能的影响。结果表明:当煅烧温度为750℃时,在不同近紫外光激发下基本上可以获得最强发光;添加Sr^(2+)离子会导致其结构发生转变;添加Y^(3+)离子后,改变了Bi^(3+)离子分布形式,进一步提高了激发强度,但是Y^(3+)离子浓度过高时,激发强度反而会降低。以上结果对于理解Bi^(3+)离子在Eu^(3+)激活红色荧光粉中的作用机制具有较大的借鉴作用。

The weak absorption of Eu^(3+)activated red phosphors has limited their application.Although broadband excitation has been achieved in Ba Bi_(2)(MoO_(4))_(4):Eu^(3+)phosphors,the structure and luminescence mechanism have not been well studied and the absorption intensity needs to be further optimized.In this study,Ba Bi_(2)(MoO_(4))_(4):Eu^(3+)red phosphors were prepared by using the solid-state reaction method.The effects of doping with Sr^(2+)and Y^(3+),structural variation and the distribution of Bi^(3+)ions on the luminescence properties of Ba Bi_(2)(MoO_(4))_(4):Eu^(3+)were systematically studied.When the calcination temperature is 750℃,the luminescence is the strongest under the excitations of near-ultraviolet light with different wavelengths.The addition of Sr^(2+)led to structural changes,whereas the doping of Y^(3+)altered the distribution of Bi^(3+)ions and further enhanced the PLE intensity.However,excessive Y^(3+)resulted in reduction in PLE intensity.Our study can be used as a reference for understanding the mechanism of Bi^(3+)ions in Eu^(3+)activated red phosphors.