Eu²⁺ and Mn²⁺ activated single phase white emitting phosphor Na(Sr,Ba)PO₄ for phosphor converted-LEDs

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• 作者：Sungho Choi ; ^{shochoi@krict.re.kr} ; Young Jun Yun ; Ha-Kyun Jung
• 关键词：LEDs ; White emitting phosphor ; Phosphate
• 刊名：Materials Letters
• 出版年：2012
• 期刊代码：59_0167577x
• 类别：ms
• 出版时间：15 May, 2012
• 卷：75
• 期：Complete
• 页码：186-188
• 文件大小：466 K

摘要

We synthesized and analyzed single-phased white light emitting phosphors, Na(Sr,Ba)PO₄:Eu²⁺, Mn²⁺, and found that the energy transfer from the Eu²⁺ to the Mn²⁺ activator followed by the photoemission was more efficient in Na(Sr_0.5Ba_0.5)PO₄ than in the Ba-free host composition, NaSrPO₄. Combining a near UV 390 nm chip and the given Na(Sr_0.5Ba_0.5)PO₄:Eu²⁺, Mn²⁺ phosphor produced a bright white light illuminating phosphor converted-light emitting diodes (pc-LEDs), demonstrating CIE chromaticity coordinates of (0.36, 0.31). The emission intensity was substantially changed with an increase of the injection current from 5 to 90 mA, while the shifts of chromaticity coordinates were nearly negligible. Those results suggest that Na(Sr,Ba)PO₄:Eu²⁺, Mn²⁺ can be a promising single component phosphor for cost effective white emitting pc-LEDs.