绿色荧光粉Ba_(2-x)B_2O_5:xTb^(3+)的制备及发光性能研究

Preparation and Luminescence Properties of Ba_(2-x)B_2O_5:xTb^(3+) Green-Emitting Phosphor

采用高温固相法合成了Ba2-xB2O5:xTb3+绿色荧光粉。XRD图谱表明合成物质为纯相的Ba2B2O5晶体。该样品在256 nm(4f8→4f75d1)处有最强激发;有4个发射峰,分别位于489 nm(5D4→7F6),545 nm(5D4→7F5),585 nm(5D4→7F4)和622 nm(5D4→7F3);其中在545 nm处有最强发射。随着Tb3+掺杂浓度的不同,激发峰与发射峰的强度先增大后减小,当x=0.7时最佳。研究了电荷补偿剂Na+对发光性能的影响,样品的发射光谱强度随Na+掺杂浓度的增大而增大,当掺杂浓度达到或超过Tb3+浓度后发射光谱强度下降。

Ba2-xB2O5：xTb^3＋ phosphors were synthesized by high temperature solid state reaction.The result by X-ray diffraction（XRD） indicated that the sample was a pure phase of Ba2B2O5 crystal structure.There were four emission peaks located at 489 nm（5D4→7F6）,545 nm（5D4 →7F5）,585 nm（5D4→ 7F4）,and 622 nm（5D4→7F3） respectively,and the most intense emission peak was at 545 nm excited by 256 nm（4f8→4f75d1）.The luminescence intensity of emission and excitation increased firstly,then decreased with increasing of Tb3＋ concentration,and it had the best value when x=0.07.The effect of charge compensator Na＋ on the luminescence properties was also researched.The result indicated that the intensity of emission spectra was greatly enhanced by increasing Na＋ concentration,but decreased when the concentration of Na＋ exceeded Tb3＋.