Tb~(3+)掺杂方钠石荧光粉的制备及发光性质研究

采用高温固相法制备了一系列Tb~(3+)掺杂方钠石荧光粉样品Na_8Al_6Si_6O_(24)Cl_2∶Tb~(3+)。通过XRD、SEM、荧光光谱、热猝灭分析仪对样品的晶体结构及其发光性能进行研究。样品晶粒由大小不等、形状不规则的多面体块状颗粒构成。样品在242 nm(对应于Tb~(3+)离子自旋允许的7FJ→9DJ跃迁)激发下发出单色性能较好的绿色荧光,相应的色坐标为(0.324 0,0.587 2),色纯度为87.4%,发光量子效率为0.74。随着Tb~(3+)掺杂浓度的增加,出现浓度猝灭现象。当浓度为5%时,样品的绿色荧光最强。研究结果表明,样品满足PDP器件的使用要求,可作为三基色材料中的绿色组分。

Synthesis and Luminescence Properties of Tb3+ Doped Sodalite Fluorescent Phosphor

A series of Na8Al6Si6O24Cl2∶x%Tb3+(x=1,3,5,7,9) phosphors were synthesized un-der a weak reducing atmosphere by traditional solid state reaction. The crystal structure and lumines-cence properties of the samples were studied by XRD, SEM, fluorescence spectra and thermal break out analyzer. The samples are composed of plane particle which are different size and irregular poly-hedron structure. The samples can be excited efficiently by 242 nm ( corresponding to the transition 7 FJ→9 DJ in Tb3+) and emit green fluorescence with better monchromaticity. The color coordinate of the green fluorescence is (0. 324 0,0. 587 2), the color purity is 87. 4%, and the luminescent quantum efficiency is 0. 74. With the increasing of Tb3+ doping concentration, the concentration quenching phenomenon occurs. When the concentration is 5%, the strongest Tb3+ green emission can be realized. The results show that the samples may meet the use requirements of PDP device, and can be used as the green group of the tri-phosphor materials.