蓝光发射荧光粉Ba_3P_4O_(13)∶Eu^(2+)的发光特性及热稳定性

Luminescence Properties and Thermal Stability of Blue Light Emitting Phosphors Ba_3P_4O_(13)∶Eu^(2+)

采用固相法在相对较低的温度(~840℃)下合成了一种可被紫外光激发的蓝光发射荧光粉α-Ba_(3-x)P_4O_(13)∶xEu^(2+),详细研究了其物相、发光特性与荧光热稳定性。在360nm紫外光的激发下,样品的发射光谱由峰位处于~439nm的不对称宽带组成。通过激发与发射光谱、荧光寿命测试及结构分析证实该不对称宽峰是由于Eu^(2+)在Ba_3P_4O_(13)中同时占据多个不同的格位所致。此外,Eu^(2+)在α-Ba_3P_4O_(13)中的最佳掺杂浓度约为x=0.06,其荧光猝灭机理为电偶极矩-电偶极矩相互作用。与商用绿色荧光粉(Ba,Sr)_2SiO_4∶Eu^(2+)相比,该荧光粉具有更好的热稳定性。α-Ba_3P_4O_(13)∶Eu^(2+)荧光粉有望在紫外激发的白光LED领域得到应用。

An ultraviolet excited blue-light emitting phosphorα-Ba 3P 4O 13∶Eu 2+has been synthesized through a solid state reaction method at a relatively low temperature of 840℃.The phase purity,luminescence properties and thermal stability of the phosphors have been investigated.Under the excitation of 360 nm ultraviolet light,intense blue emission could be observed and the emission spectrum ofα-Ba 3P 4O 13∶Eu 2+consisted of a broad and asymmetric emission band centered at^439 nm.Based on the analysis of the excitation and emission spectra,luminescence decay curves and crystal structure,the broad and asymmetric band could be ascribed to that Eu 2+ions occupy multiple different Ba 2+sites inα-Ba 3P 4O 13.Moreover,the optimal Eu 2+concentration was about 6 mol%,and the dominant concentration quenching mechanism of Eu 2+was the dipole-dipole interaction in this case.Interestingly,α-Ba 3P 4O 13∶Eu 2+showed better thermal stability than that of commercial green phosphor(Ba,Sr)2SiO 4∶Eu 2+.The results suggested thatα-Ba 3P 4O 13∶Eu 2+blue phosphor could find potential application in ultraviolet excited WLEDs.