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http://dx.doi.org/10.6117/kmeps.2012.19.2.041

Synthesis and Optical Properties of M-Si(Al)-O-N (M: Sr, Ca) Phosphors for white Light Emitting Diodes  

Lee, Seung-Jae (Department of Materials Science and Engineering, Kyonggi University)
Lee, Jun-Seong (Department of Materials Science and Engineering, Kyonggi University)
Kim, Young-Jin (Department of Materials Science and Engineering, Kyonggi University)
Publication Information
Journal of the Microelectronics and Packaging Society / v.19, no.2, 2012 , pp. 41-45 More about this Journal
Abstract
Oxynitride green phosphors for white light emitting diodes (LEDs) were synthesized and their optical properties were evaluated. The N/O ratio ($\delta$) of $SrSi_2O_{2-{\delta}}N_{2+2/3{\delta}}:Eu^{2+}$ closely depended on the synthesizing conditions. The most excellent green emission (545 nm), which was assigned to the $5d{\rightarrow}4f$ transition of $Eu^{2+}$ ions, was achieved at the conditions of $1700^{\circ}C$, 5 mol% $Eu^{2+}$, and $H_2$ atmosphere. The well-developed $Ca-{\alpha}-SiAlON:Yb^{2+}$ particles with homogeneous size were obtained at m = 3 (n = 0.15) for the compound of $Ca_{0.5m-0.005}Yb_{0.005}Si_{12-(m+n)}Al_{m+n}O_nN_{16-n}$, resulting in the strong green emission at around 550 nm.
Keywords
$SrSi_2O_2N_2$; Ca-${\alpha}$-SiAlON; Luminescence; Phosphors; Oxynitride;
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Times Cited By KSCI : 2  (Citation Analysis)
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