Lianhua Tian

Enhanced luminescence of SrTiO3:Pr3+ by incorporation of Li+ ion

Abstract Photoluminescence and low-voltage cathodoluminescence characteristics of the [ x SrTiO 3 +(1− x )Li 2 TiO 3 ]:Pr 3+ system have been investigated. The red luminescence intensity of this compound was enhanced remarkably by the incorporation of Li + ions as compared with that of lithium-free SrTiO 3 :Pr 3+ . The enhanced luminescence is conjectured to result mostly from the oxygen vacancy generated by Li + ion incorporation in the lattices. The oxygen vacancy in the lattice promotes the energy transfer from the excited carrier in lattices to the Pr 3+ activator ion, leading to an increase in the luminescence efficiency.

P-76: Photoluminescence Characteristics of Eu3+ or Tb3+ Activated Ca4YO(BO3)3

Luminescence and vacuum ultraviolet (VUV) excitation properties of Ca4YO(BO3)3 doped with the Eu3+ or Tb3+ ion are investigated. In Ca4YO(BO3)3: Eu3+, the excitation band appears strongly at 250 nm with ca. 100 nm bandwidth. The mercury discharge plasma line at 254 nm can be absorbed efficiently by Ca4YO(BO3)3: Eu3+, and the resultant emission at ca. 611 nm makes it an excellent red phosphor for lighting applications. The Tb3+ ion in Ca4YO(BO3)3 also emits efficiently green at 547 nm similar to that in oxides with UV the excitation of the allowed 4f 5d transition.

P‐78: Enhanced Photoluminescence of BaZr(BO3)2:Eu3+ with Incorporation of Al3+ and La3+ Ions for PDP Application

The photoluminescence (PL) and vacuum ultraviolet (VUV) excitation properties are studied for BaZr(BO3)2:Eu3+. The excitation spectrum shows strong absorption in the VUV region with an absorption band edge at 200 nm. The charge transfer excitation band of Eu3+ at ca. 226 nm is enhanced by codoping Al3+ ion into the BaZr(BO3)2 lattices. The band gap absorption is enhanced by codoping La3+. The PL spectrum shows the strongest emission at 615 nm in BaZr(BO3)2:Eu3+, which results in a good red color purity. The luminescence intensity is enhanced by codoping with Al3+ and La3+.