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  • Title: [Spectra of Ce3+, Tb3+ and Gd3+ Ions in Ln(BO3,PO4) [Ln = La, Y]].
    Author: Ding S, Zhang W, Xu B, Wang J.
    Journal: Guang Pu Xue Yu Guang Pu Fen Xi; 2001 Jun; 21(3):275-8. PubMed ID: 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.
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