[Ln（BO₃，PO₄）[Ln = La，Y]中Ce³⁺、Tb³⁺和Gd³⁺离子的光谱]

[Spectra of Ce3+, Tb3+ and Gd3+ Ions in Ln(BO3,PO4) [Ln = La, Y]].

作者信息

Ding S, Zhang W, Xu B, Wang J

机构信息

Department of Electronic Engineering, Fudan University, 200433 Shanghai.

出版信息

Guang Pu Xue Yu Guang Pu Fen Xi. 2001 Jun;21(3):275-8.

PMID:12947644

Abstract

Emission and excitation spectra of Ce3+, Tb3+ and Gd3+ in lanthanum borophosphate and yttrium borophosphate are studied. The results show that Ce3+ emission weakens and Tb3+ emission enhances in La(BO3, PO4):Ce, Tb in the presence of Gd, and in Y(BO3, PO4):Ce, Tb, the Ce3+ and Tb3+ emissions are all enhanced, and the former increases more than the latter. In a whole, Gd3+ acts as intermediate of energy transfer from Ce3+ to Tb3+ and sensitizer in La(BO3, PO4):Ce, Tb, Gd; while in Y(BO3, PO4):Ce, Tb, Gd, Gd3+ acts only as sensitizer, and prevents energy transfer from Ce3+ to Tb3+. Compared with Y(BO3, PO4):Ce, Tb, Gd, La(BO3, PO4):Ce, Tb, Gd, phosphor absorbs ultraviolet radiation easily, and emits green light with higher purity and intensity under 254 nm excitation, so it is more suitable for green-emitting phosphor in fluorescent lamp.

摘要

研究了磷酸硼镧和磷酸硼钇中Ce3+、Tb3+和Gd3+的发射光谱和激发光谱。结果表明，在Gd存在的情况下，La(BO3, PO4):Ce, Tb中Ce3+发射减弱而Tb3+发射增强；在Y(BO3, PO4):Ce, Tb中，Ce3+和Tb3+发射均增强，且前者增强幅度大于后者。总体而言，在La(BO3, PO4):Ce, Tb, Gd中，Gd3+充当从Ce3+到Tb3+的能量转移中间体和敏化剂；而在Y(BO3, PO4):Ce, Tb, Gd中，Gd3+仅充当敏化剂，并阻止能量从Ce3+转移到Tb3+。与Y(BO3, PO4):Ce, Tb, Gd相比，La(BO3, PO4):Ce, Tb, Gd荧光粉更容易吸收紫外辐射，在254 nm激发下发射出更高纯度和强度的绿光，因此更适合用作荧光灯中的绿色发光荧光粉。