Synthesis and characterization of nano-sized YAG:Ce, Sm spherical phosphors

详细信息    查看全文

• 作者：Haiying SUN (Ëﺣӥ) ; ^{sun.haiying78@163.com} ; Xiyan ZHANG (ÕÅÏ£ÑÞ) ; Zhaohui BAI (°Ø³¯êÍ)
• 关键词：malic acid sol-gel method ; YAG ; Ce ; Sm3+ phosphors ; white LED ; red-shift ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2013
• 出版时间：March, 2013
• 年：2013
• 卷：31
• 期：3
• 页码：231-234
• 全文大小：949 K

文摘

YAG:Ce, Sm spherical phosphors were synthesized by malic acid sol-gel method. The formation process of crystalline was characterized by X-ray diffraction (XRD) technique. The influence of Sm³⁺ doping on the luminescent intensity and the morphology of phosphors were studied by fluorescence spectrum and scanning electron microscopy (SEM) techniques, respectively. The results indicated that the size of spherical powders was about 100 nm calcined at 1200 ??for 3 h. The emission spectra of phosphors showed gradual red-shift from 525 to 540 nm with the increase of doping concentration of Sm³⁺ ion. A broadband emission spectrum of Ce³⁺ ion appeared at 540 nm, and a series of emission peaks corresponding to the ⁴G_5/2??>6H_J transition of Sm³⁺ ion also appeared at 617 nm with the doping of Sm³⁺. The red component of YAG:Ce phosphors increased with the doping of Sm³⁺.