[Spectra of Ce3+, Tb3+ and Gd3+ Ions in Ln(BO3,PO4) [Ln = La, Y]].
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.
Ding
S
S
Department of Electronic Engineering, Fudan University, 200433 Shanghai.
Zhang
W
W
Xu
B
B
Wang
J
J
D002563:Cerium / Q000737:chemistry*; D004735:Energy Transfer; D005682:Gadolinium / Q000737:chemistry*; D007811:Lanthanum / Q000737:chemistry; D049449:Luminescence; D008674:Metals, Rare Earth / Q000737:chemistry*; D013057:Spectrum Analysis / Q000379:methods; D013725:Terbium / Q000737:chemistry*; D015019:Yttrium / Q000737:chemistry
D008674:Metals, Rare Earth; D013725:Terbium; D002563:Cerium; D015019:Yttrium; D007811:Lanthanum; D005682:Gadolinium