TY - JOUR
T1 - 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
AU - Nakano, Hiromi
AU - Ozono, Keita
AU - Hayashi, Hiroyuki
AU - Fujihara, Shinobu
PY - 2012/9
Y1 - 2012/9
N2 - 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.
AB - 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.
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U2 - 10.1111/j.1551-2916.2012.05372.x
DO - 10.1111/j.1551-2916.2012.05372.x
M3 - Article
AN - SCOPUS:84865779460
SN - 0002-7820
VL - 95
SP - 2795
EP - 2797
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
IS - 9
ER -