Evolution of Luminescence of Sr2-y-zCazSi(O1-xNx)4:yEu2+ with N3-, Eu2+, and Ca2+ Substitutions
Evolution of Luminescence of Sr2-y-zCazSi(O1-xNx)4:yEu2+ with N3-, Eu2+, and Ca2+ Substitutions
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DOI：
10.1021/cg400751n
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发表时间：
2013-12-01
影响因子：
3.8
通讯作者：
Kim, Young Jin
中科院分区：
文献类型：
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作者：
Park, Jungkyu;Lee, Seung Jae;Kim, Young Jin
通过在Sr2SiO4(SSO)中掺杂N3-、Eu2+和Ca2+离子，制备了Sr2-y-zCazSi(O1-xNx)(4)：Yeu(2+)(SCSON：Eu2+)固溶体。这些离子对SCSON：Eu2+发光演化的贡献不同。SSON：Eu2+(z=0)有两个活化中心：Eu(I)和Eu(II)。氮化效应使Eu(1)位周围的晶场发生了显著变化，但对Eu(I)位几乎没有影响。相应地，SSON：Eu2+表现出从紫外到可见光的宽广的激发光谱。与SSO：Eu2+的Eu(II)绿色发射相比，Eu(II)发射的主要峰值波长(DPWs)位于红色发射区(605-630 nm)，这取决于Eu2+离子的数量。SCSON：Eu2+的钙离子优先改变了Eu(I)的发射波长，影响了Eu(II)的发射强度。除了光谱性质外，SCSON：Eu2+粉末的色度坐标和低热猝灭行为表明，它们可以成为一种用于白光发光二极管的新型红色荧光粉。
Sr2-y-zCazSi(O1-xNx)(4):yEu(2+) (SCSON:Eu2+) solid solutions were prepared by substituting N3-, Eu2+, and Ca2+ ions into Sr2SiO4 (SSO). These ions contributed differently to the evolution of luminescence of SCSON:Eu2+. SSON:Eu2+ (z = 0) has two activation centers: Eu(I) and Eu(II). The nitridation effects led to a dramatic change in the crystal field surrounding the Eu(1) site but rarely affected the Eu(I) site. Accordingly, SSON:Eu2+ exhibited broad excitation spectra from ultraviolet to visible wavelengths. In comparison with the Eu(II) green emissions of SSO:Eu2+, the dominant peak wavelengths (DPWs) of the Eu(II) emissions were at red emission regions (605-630 nm), depending on the amount of Eu2+ ions. The Ca2+ ions of SCSON:Eu2+ preferentially changed the emission wavelength assigned to Eu(I) and affected the Eu(II) emission intensity. In addition to the spectral properties, the chromaticity coordinates and a low thermal quenching behavior of SCSON:Eu2+ powders demonstrated that they can be a novel red phosphors for use in white light emitting diodes.