Synthesis of New RE3+ Doped Li1+ xTa1- xTi x O₃ (RE: Eu, Sm, Er, Tm, and Dy) Phosphors with Various Emission Colors

Hiromi Nakano; Shiho Suehiro; Shohei Furuya; Hiroyuki Hayashi; Shinobu Fujihara

doi:10.3390/ma6072768

Synthesis of New RE³⁺ Doped Li_{1+ x}Ta_{1- x}Ti _x O₃ (RE: Eu, Sm, Er, Tm, and Dy) Phosphors with Various Emission Colors

Materials (Basel). 2013 Jul 11;6(7):2768-2776. doi: 10.3390/ma6072768.

Authors

Hiromi Nakano¹, Shiho Suehiro², Shohei Furuya³, Hiroyuki Hayashi⁴, Shinobu Fujihara⁵

Affiliations

¹ Toyohashi University of Technology, Tempaku, Toyohashi 441-8580, Japan. hiromi@crfc.tut.ac.jp.
² Toyohashi University of Technology, Tempaku, Toyohashi 441-8580, Japan. s113517@edu.tut.ac.jp.
³ Toyohashi University of Technology, Tempaku, Toyohashi 441-8580, Japan. s123440@edu.tut.ac.jp.
⁴ KRI, Inc., Chudoji Minami-machi, Shimogyo-ku, Kyoto 600-8813, Japan. h-hayasi@kri-inc.jp.
⁵ Keio University, Yokohama 223-8522, Japan. shinobu@applc.keio.ac.jp.

Abstract

New phosphors with various emission colors for RE³⁺ doped Li_1+xTa_1-xTi_xO₃ (LTT) (RE: Eu, Sm, Er, Tm, and Dy) were synthesized by electric furnace at 1423 K for 15 h. The microstructure of the host material and the photoluminescence (PL) property were determined and compared to those of RE³⁺ doped Li_1+xNb_1-xTi_xO₃ (LNT)_. In the LTT phosphor, the highest PL intensity was achieved for the mixture composition Li_1.11Ta_0.89Ti_0.11O₃ with a LiTaO₃ structure, although it has an M-phase superstructure. In the LTT host material, the effective activators were Eu³⁺ and Sm³⁺ ions, in contrast to the LNT host material. Here, we discuss the relationship between PL property and the host material's structure.

Keywords: host material; phosphor; photoluminescence; solid solution; structure.