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首页> 外文期刊>Crystal growth & design >Evolution of luminescence of Sr_(2-y-Z)Ca_zSi(O _(1- x)N_x)_4: Y Eu~(2+) with N ~(3-), Eu~(2+), and Ca~(2+) substitutions
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Evolution of luminescence of Sr_(2-y-Z)Ca_zSi(O _(1- x)N_x)_4: Y Eu~(2+) with N ~(3-), Eu~(2+), and Ca~(2+) substitutions

机译:Sr_(2-yZ)Ca_zSi(O _(1- x)N_x)_4的发光演化:Y Eu〜(2+)带有N〜(3-),Eu〜(2+)和Ca〜(2 +)替代

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摘要

Sr_(2-y-z)Ca_zSi(O_(1-x)N_x) _4:yEu~(2+) (SCSON:Eu~(2+)) solid solutions were prepared by substituting N~(3-), Eu~(2+), and Ca~(2+) ions into Sr_2SiO_4 (SSO). These ions contributed differently to the evolution of luminescence of SCSON:Eu~(2+). SSON:Eu~(2+) (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(II) site but rarely affected the Eu(I) site. Accordingly, SSON:Eu ~(2+) exhibited broad excitation spectra from ultraviolet to visible wavelengths. In comparison with the Eu(II) green emissions of SSO:Eu ~(2+), the dominant peak wavelengths (DPWs) of the Eu(II) emissions were at red emission regions (605-630 nm), depending on the amount of Eu ~(2+) ions. The Ca~(2+) ions of SCSON:Eu~(2+) 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:Eu ~(2+) powders demonstrated that they can be a novel red phosphors for use in white light emitting diodes.
机译:Sr_(2-yz)Ca_zSi(O_(1-x)N_x)_4:yEu〜(2+)(SCSON:Eu〜(2+))固溶体通过替换N〜(3-),Eu〜( 2+)和Ca〜(2+)离子进入Sr_2SiO_4(SSO)。这些离子对SCSON:Eu〜(2+)发光的贡献不同。 SSON:Eu〜(2+)(z = 0)有两个激活中心:Eu(I)和Eu(II)。氮化作用导致Eu(II)位点周围的晶体场发生了巨大变化,但很少影响Eu(I)位点。因此,SSON:Eu〜(2+)表现出从紫外到可见光的宽激发光谱。与SSO:Eu〜(2+)的Eu(II)绿色发射相比,Eu(II)发射的主要峰值波长(DPWs)在红色发射区域(605-630 nm),具体取决于发射量Eu〜(2+)离子。 SCSON:Eu〜(2+)的Ca〜(2+)离子优先改变分配给Eu(I)的发射波长,并影响Eu(II)的发射强度。除光谱特性外,SCSON:Eu〜(2+)粉末的色度坐标和低热淬灭行为证明它们可以是用于白光发光二极管的新型红色磷光体。

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