Luminescent properties of Dy³⁺ or/and Tm³⁺ co-doped in La₃PO₇ for white LEDs

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• 作者：Jiyou Wang ; Jianbo Wang ; Ping Duan
• 关键词：Luminescence ; La3&minus ; x&minus ; yPO7 ; xDy3+&minus ; yTm3+ ; Phosphors ; White LEDs
• 刊名：Optical Materials
• 出版年：December, 2013
• 年：2013
• 卷：36
• 期：2
• 页码：572-574
• 全文大小：677 K

文摘

Dy³⁺/Tm³⁺ single doped and co-doped La₃PO₇ phosphors were synthesized by solid state reaction method. The single doped Dy³⁺/Tm³⁺ ions showed their characteristic emissions yellow and blue. The luminescence intensity of this phosphor firstly increased and then decreased with increasing concentration of Dy³⁺ ions. The experimental results and the theoretical calculation indicate that the concentration quenching mechanism of Dy³⁺ ions in La₃PO₇ is the dipole-dipole interaction. By changing the doping concentration of Dy³⁺ and Tm³⁺ in La₃PO₇, their corresponding color coordinates are very close to the white color chromaticity coordinates (x = 0.33, y = 0.33). These results indicate that the La_{3鈭?/sub>x鈭?/sub>yPO7:xDy³⁺鈭?em>yTm³⁺ phosphors exhibit great potential for use as single-component phosphors for w-LEDs.}