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首页> 外文期刊>Chemistry: A European journal >Sr_5Al_(5+x)Si_(21x)N_(35x)O_(2+x(:Eu~(2+) (x≈0)—A Novel Green Phosphor for White-Light pcLEDs with Disordered Intergrowth Structure
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Sr_5Al_(5+x)Si_(21x)N_(35x)O_(2+x(:Eu~(2+) (x≈0)—A Novel Green Phosphor for White-Light pcLEDs with Disordered Intergrowth Structure

机译：Sr_5Al_（5 + x）Si_（21x）N_（35x）O_（2 + x（：Eu〜（2+）（x≈0））—一种用于无序共生结构的白光pcLED的新型绿色荧光粉

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摘要

Sr_5Al_(5+x)Si_(21x)N_(35x)O_(2+x(:Eu~(2+) (x≈0) was obtained by high-temperature synthesis (1600 to 1750 8C). Upon doping with Eu~(2+), the thermally very stable material shows an efficient broadband emission in the green spectral range (λ_(max)≈510 nm, FWHM= 69 nm) under UV to blue light excitation. The compound exhibits a complex intergrowth structure (space group Pmn21 (no. 31); a=23.614, b=7.487, c=9.059 A; V=1601.5(6) A~3 ; Z=2, R1=0.067), which consists of highly condensed dreier ring layers alternating with sechser ring layers that include both vertex- and edge-sharing (Si,Al)- ACHTUNGTRENUNG(O,N)4 tetrahedra. Both layer types exhibit pseudotranslational symmetry, which leads to a more or less pronounced disorder of the sechser ring layers. The Sr atoms are located in channel-like voids of the silicate framework with coordination number nine. The compound has been characterized by single-crystal and powder X-ray diffraction, as well as high-resolution electron microscopy and electron diffraction. The structure and chemical composition has been confirmed by 29Si solid-state NMR spectroscopy, lattice energy calculations, and diverse elemental analyses.
机译：通过高温合成（1600〜1750 8C）得到Sr_5Al_（5 + x）Si_（21x）N_（35x）O_（2 + x（：Eu〜（2+）（x≈0））。 〜（2+），这种非常热稳定的材料在紫外到蓝光的激发下，在绿色光谱范围（λ_（max）≈510nm，FWHM = 69 nm）中显示出有效的宽带发射。该化合物具有复杂的共生结构（空间群Pmn21（编号31）; a = 23.614，b = 7.487，c = 9.059 A; V = 1601.5（6）A〜3; Z = 2，R1 = 0.067），由高度稠密的dreier环层交替组成sechser环层同时包含顶点共享和边缘共享（Si，Al）-ACHTUNGTRENUNG（O，N）4四面体。两种层均显示伪平移对称性，从而导致sechser环层或多或少明显混乱。 Sr原子位于配位数为9的硅酸盐骨架的通道状空隙中，该化合物的特征在于单晶和粉末X射线衍射，以及高分辨率电子显微镜和子衍射。结构和化学组成已通过29Si固态NMR光谱，晶格能量计算和各种元素分析得到证实。

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