https://scholars.lib.ntu.edu.tw/handle/123456789/407376
Title: | Red-emission improvement of Eu2+-Mn2+ co-doped Sr2Si5N8 phosphors for white light-emitting diodes | Authors: | Lin H.-C. Yang C.-Y. Das S. Lu C.-H. |
Keywords: | D. Nitride;Energy transfer;Red phosphors;White LED | Issue Date: | 2014 | Journal Volume: | 40 | Journal Issue: | 8 PART A | Start page/Pages: | 12139-12147 | Source: | Ceramics International | Abstract: | Eu2+ and Mn2+ ions co-doped Sr2Si 5N8 phosphors with enhanced luminescence properties were successfully prepared in this study. Under blue excitation at 420 nm, Sr 2Si5N8: Eu2+ displayed a broad emission band peaking at about 615 nm, which originated from the 4f 65d1¡÷4f7 transitions of Eu2+ ions. Sr2Si5N8: Mn2+ exhibited a broad band at around 608 nm owing to the 4T1( 4G)¡÷6A1(6S) transitions of Mn2+ ions. As Mn2+ ions were incorporated into Sr 2Si5N8: Eu2+, an increase in the emission intensity in the red region was observed. The improvement in the emission intensity was attributed to the energy transfer from Mn2+ to Eu2+ ions. The mechanism of the energy transfer was confirmed to be a dipole-dipole interaction and the critical distance between Eu2+ and Mn2+ ions was evaluated. Sr2Si5N 8: Mn2+, Eu2+ with enhanced luminescence properties and improved thermal stability is demonstrated to be a promising red-emitting phosphor for applications in white LEDs. ? 2014 Elsevier Ltd and Techna Group S.r.l. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/407376 | ISSN: | 02728842 | DOI: | 10.1016/j.ceramint.2014.04.054 |
Appears in Collections: | 化學工程學系 |
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