Photoluminescence Properties of (Ba1-(x+y)SrxEuy)2Si6O12N2 Phosphors for White LED Applications

Narendra G. Sarda; Hiroshi Fujigaki; Yuma Ogita; Andrew Chan; Kei-Ichiro Murai; Geoffrey I.N. Waterhouse; Toshihiro Moriga

doi:10.4028/www.scientific.net/JNanoR.36.1

Paper Titles

Photoluminescence Properties of (Ba_1-(x+y)Sr_xEu_y)₂Si₆O₁₂N₂ Phosphors for White LED Applications
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HomeJournal of Nano ResearchJournal of Nano Research Vol. 36Photoluminescence Properties of...

Photoluminescence Properties of (Ba_1-(x+y)Sr_xEu_y)₂Si₆O₁₂N₂ Phosphors for White LED Applications

Abstract:

(Ba_1-(x+y)Sr_xEu_y)₂Si₆O₁₂N₂ oxynitride phosphors were successfully synthesized by the solid-state reaction method at 1200°C under a H₂(5%) + N₂(95%) atmosphere. The Sr²⁺ content (x) was varied in the range 0-0.6 and the Eu²⁺ content varied in the range 0.05-0.25, with the Si/(Ba+Sr+Eu) ratio fixed at 3. Results showed that the emission characteristics of (Ba_1-(x+y)Sr_xEu_y)₂Si₆O₁₂N₂ phosphors under UV or blue-light excitation was strongly dependent on the chemical composition. The phosphor (Ba_0.95Eu_0.05) Si₆O₁₂N₂ showed an intense green emission peak at 520 nm, whilst the phosphor (Ba_0.45Sr_0.5Eu_0.05)Si₆O₁₂N₂had a weaker emission maximum at 548 nm. Ba²⁺ substitution with Sr²⁺ decreased the lattice volume of the (Ba_1-(x+y)Sr_xEu_y)₂Si₆O₁₂N₂ phosphors and was responsible for the red-shift in the emission peak. Optimization of the Eu²⁺ concentration at a fixed Sr²⁺ content of 0.2 identified the phosphor (Ba_0.65Sr_0.2Eu_0.15)₂Si₆O₁₂N₂ as a potential alternative to YAG:Ce yellow phosphors for white LED applications.

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Journal of Nano Research (Volume 36)

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1-7

DOI:

https://doi.org/10.4028/www.scientific.net/JNanoR.36.1

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Online since:

November 2015

Authors:

Narendra G. Sarda, Hiroshi Fujigaki, Yuma Ogita, Andrew Chan, Kei-Ichiro Murai, Geoffrey I.N. Waterhouse, Toshihiro Moriga*

Keywords:

Leds, Oxynitrides, Phosphors, Photoluminescence

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