凝胶-燃烧法合成(Y,Gd)Al3(BO3)4:Tb3+荧光材料的结构及其发光性能

Structure and Luminescence Properties of (Y, Gd)Al3(BO3)4:Tb3+ Phosphors by Gel Combustion Synthesis

摘要:

采用凝胶-燃烧法合成掺Tb3+和Gd3+的四硼酸铝钇(Y,Gd)Al3(BO3)4:Tb3+荧光粉。分别采用X射线衍射仪(XRD)、扫描电镜(SEM)、发光光谱等测试手段分析不同温度下煅烧所得粉体的物相、形貌与发光性质。XRD和SEM结果表明：(Y,Gd)Al3(BO3)4:Tb3+的最低合成温度为1000 ℃，在该反应过程中，首先形成中间相Al4B2O9、YBO3和Y3Al5O12，而最终形成单相的(Y,Gd)Al3(BO3)4:Tb3+。随煅烧温度的升高，样品结晶程度越来越好，并且颗粒尺寸随温度的升高而增大，在1100 ℃时合成的晶粒尺寸比较均匀，平均粒径在1 μm左右。发光光谱的测试结果表明：在229 nm激发下，(Y,Gd)Al3(BO3)4: Tb3+荧光粉最强发射峰位于542 nm处，属于Tb3+的5D4→7F5的跃迁。在该体系中存在Gd3+→Tb3+的能量传递，使得该荧光粉的发光强度随着Gd3+掺杂浓度的增加而增大

Abstract:

(Y,Gd)Al3(BO3)4:Tb3+ phosphors were synthesized by a gel combustion method. The phase composition, morphology and luminescent properties of the powders derived from the sintered precursor at different temperatures were analyzed by X–ray diffraction (XRD), scanning electron microscope (SEM) and photoluminescent measurement (PL). The results show that the purified (Y,Gd)Al3(BO3)4:Tb3+ crystalline phase could be obtained at 1000 ℃. The intermediate phases: Yttrium borate (YBO3) , aluminum borate (Al4B2O9) and yttrium aluminum garnet, are generated firstly, then the finally single-phase YAB:Eu3+ is produced. The powder as-prepared at 1100 ℃ consists of relatively homogeneous particles with the average diameter of 1 μm. The luminescent properties of (Y, Gd)Al3(BO3)4:Tb3+ are presented. In the emission spectrum of (Y, Gd)Al3(BO3)4:Tb3+ excited by 229 nm, the main peak is located at about 542 nm due to the transition of 5D0→7F2 of Tb3+ emission. The PL intensity of Tb3+ in Y0.9-xGdxAl3Tb0.1(BO3)4 increases with the increase of x values due to an energy migration process like Gd3+→Tb3+ occurred in the phosphors