Synthesis and luminescent properties of a new Eu 3+-doped Li 1+x (Ta 1-z Nb z) 1-x Ti x O 3 Red phosphor

Hiromi Nakano, Keita Ozono, Hiroyuki Hayashi, Shinobu Fujihara

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Abstract

A new red phosphor based on the Li 1+x (Ta 1-zNb z) 1-xTi xO 3 (LTNT, 0.05 ≤ x a;circ 0.25, 0 ≤ z a;circ 0.625) solid solution as a host material has been synthesized. This host material is known as an M-phase and has a superstructure similar to that of the Li 1+x-yNb 1-x-3yTi x+4yO 3 (LNT) solid solution. An Eu 3+-doped LTNT has been prepared by sintering at 1413 K-1433 K for 24 h in a conventional electric furnace; the optimal sintering temperature for obtaining higher photoluminescence (PL) intensity was found to be 1423 K. Interestingly, bright red emission due to the hypersensitive 5D 0- 7F 2 transition in Eu 3+ was observed under direct excitation of the 4f electron at 541 ( 7F 0- 5D 1) or 398 nm ( 7F 0- 5L 6). The PL intensity of the LTNT phosphor was found to be dependent on the concentration of Eu 3+, Ti 4+, Nb 5+, and Ta 5+ ions. The PL intensity upon excitation at 541 nm was higher than that at 398 nm with decreasing Nb 2O 5 content in the LTNT host material. The highest PL intensity was achieved for the composition Li 1.11Ta 0.89Ti 0.11O 3 doped with 2.5 wt% of Eu 2O 3.

Original languageEnglish
Pages (from-to)2795-2797
Number of pages3
JournalJournal of the American Ceramic Society
Volume95
Issue number9
DOIs
Publication statusPublished - 2012 Sep 1

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ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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