Photoluminescence profiles and fast/slow annealing effects of Eu(III)/Tb(III)‐codoped silica phosphor materials |
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| Authors: | Hee Jung Yoon Young In Choi Jun‐Gill Kang Youngku Sohn |
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| Affiliation: | 1. School of Chemistry and Biochemistry, Yeungnam University, Gyeongsan, Gyeongbuk, South Korea;2. Department of Chemistry, Chungnam National University, Daejeon, South Korea |
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| Abstract: | A silica (SiO2) nanoparticle matrix was codoped with luminescent Eu(III) and Tb(III) ions using a modified Stöber method. The effects of fast and slow thermal annealing on photoluminescence profile imaging were examined. Slow annealing treatment suppressed more quenching sites than fast thermal annealing to further increase the photoluminescence signals. The photoluminescence signals observed between 450 and 720 nm were assigned to the 5D0 → 7FJ (J = 0,1,2,3,4) of Eu(III) and the 5D4 → 7FJ (J = 6,5,4,3) transitions of Tb(III). Photoluminescence was largely sensitized by indirect excitation and was much stronger than that generated by direct excitation. The Eu(III) and Tb(III) ions were doped at lower symmetry sites in the silica matrix. Copyright © 2015 John Wiley & Sons, Ltd. |
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| Keywords: | photoluminescence annealing silica Eu(III) Tb(III) |
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