LaP3O9：Ce,Tb磷光体的合成与光谱特性

Ce~(3+)离子有宽而强的4f-5d吸收带,能有效地吸收能量,并形成强的宽带发射。Ce~(3+)的5d-4f跃迁是允许的电偶极子跃迁,其5d态的寿命非常短。为此Ce~(3+)可将能量有效地传递给其它离子,而成为良好的敏化剂。通常Ce~(3+)对Tb~(3+)的敏化十分有效,已有许多Ce~(3+)敏化Tb~(3+)的绿色发光材料。稀土磷酸盐是发光和激光材料的良好基质,LaPO_4:Ce,Tb已用作灯用三基色荧光粉,对不同类型稀土磷酸盐中Ce~(3+)、Tb~(3+)的发光已有不少报道,为探索新的高效

PREPARATION AND SPECTROSCOPIC PROPERTIES OF LaP_3O_9:Ce,Tb PHOSPHORS

Pure phase LaP_3O_9 : Ce, Tb phosphors have been prepared by precipitation from solution followed by subsequent igniting. They are of cyclic structure and belong to the orthorhombic crystal system with space group C_(222_1). The spectra of LaP_3O_9 : Ce, LaP_3O_9 : Tb and LaP_3O_9 : Ce,Tb have been measured. It was observed that Ce~(3+) can effectively transfer its energy to Tb~(3+), greatly enhancing the emission of Tb~(3+). From the results obtained it can be argued that LaP_3O_9 : Ce,Tb might be a new green-emitting phosphor of high efficientcy.