Luminescence properties of Eu²⁺-doped Ba₃Si₆O₁₂N₂ green phosphor: concentration quenching and thermal stability

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• 作者：Guantong CHEN (³Â¹Ûͨ) ; Weidong ZHUANG (ׯÎÀ¶«) ; ^{wdzhuang@126.com} ; Yunsheng HU (ºúÔËÉú) ; Yuanhong LIU (ÁõÔªºì) ; Ronghui LIU (ÁõÈÙ»Ô) ; Huaqiang HE (ºÎ»ªÇ¿)
• 关键词：oxynitride phosphor ; white LEDs ; photoluminescence ; concentration quenching ; thermal stability ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2013
• 出版时间：February, 2013
• 年：2013
• 卷：31
• 期：2
• 页码：113-118
• 全文大小：651 K

文摘

The efficient Eu²⁺-doped Ba₃Si₆O₁₂N₂ green phosphors were prepared by a traditional solid state reaction method under N₂/H₂ atmosphere at a temperature up to 1350 ??for 12 h. Photoluminescence (PL) properties showed a broad emission band with a peak of 525 nm and the full width of half-emission maximums (FWHM) of 70 nm under 460 nm light irradiation. The X-ray diffraction patterns (XRD) and scanning electron microscope (SEM) images of the synthesized powder demonstrated its pure phase and excellent crystallization. Quenching concentration in this phosphor was found to be 0.3. The mechanisms of concentration quenching and redshift of emission peak with increasing concentration of Eu²⁺ were studied. The temperature dependence measurement of this green phosphor revealed excellent thermal quenching property compared to silicate green phosphor. It is believed that Ba₃Si₆O₁₂N₂:Eu²⁺ is an excellent green phosphor for UV or blue chip based white LEDs.