Preparation of Aluminum Oxynitride by Nitridation of a Precursor Derived from Aluminum–Glycine Gel and the Effects of the Presence of Europium
Preparation of Aluminum Oxynitride by Nitridation of a Precursor Derived from Aluminum–Glycine Gel and the Effects of the Presence of Europium
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DOI：
10.1111/j.1551-2916.2007.02213.x
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发表时间：
2008-03
影响因子：
3.9
通讯作者：
S. Kikkawa;N. Hatta;T. Takeda
中科院分区：
文献类型：
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作者：
S. Kikkawa;N. Hatta;T. Takeda
将甘氨酸凝胶与硝酸铝胶溶制备的氧化物前驱体经氨氮化得到尖晶石型AlON，Al2.75-0.25O3.74N0.26。为了实现结晶，氮化产物必须在流动的氮气中在1500℃下退火10分钟。使用甘氨酸代替柠檬酸对于获得无残留碳的白色产品是很重要的。使用类似的制备方法来添加低于10摩尔%的少量Eu。在0.5~3.0mol%Eu掺杂范围内，观察到较强的蓝光发射。当激发波长为254 nm时，当掺杂量为0.5mol%时，产物的最大发射波长为400 nm。当掺杂摩尔分数为1和3时，产物在475 nm和520 nm处出现双峰。这三种发光是由于EuAl12O19类磁铅锌矿状氮氧化铝杂质与Alon尖晶石主相混合而产生的二价Eu。与EuAl12O19磁铅矿本身相比，1mol%Eu掺杂产物具有扩展的六方晶格参数(a=0.5591和c=2.236 nm)，在7.7mol%掺杂产物中观察到没有任何强发射。讨论了上述光谱变化与Eu2+配位的关系。
Spinel-type AlON, Al2.75□0.25O3.74N0.26, was obtained by ammonia nitridation of an oxide precursor prepared by peptizing a glycine gel with aluminum nitrate. To achieve crystallization, the nitrided product had to be annealed at 1500°C for 10 min in flowing nitrogen. The use of glycine instead of citric acid was important for obtaining a white product without residual carbon. A similar preparation method was used for adding small amounts of europium below 10 mol%. A strong blue emission was observed for products ranging from 0.5 to 3.0 mol% Eu doping. The product with 0.5 mol% doping had a maximum emission intensity at 400 nm for an excitation of 254 nm. The products with 1 and 3 mol% doping showed double maxima at 475 and 520 nm. These three emissions were due to the presence of divalent europium in the EuAl12O19 magnetoplumbite-like aluminum oxynitride impurity mixed with the AlON spinel major phase. The 1 mol% Eu-doped product exhibited expanded hexagonal lattice parameters (a=0.5591 and c=2.236 nm) compared with the values for EuAl12O19 magnetoplumbite itself, observed in the 7.7 mol%-doped product without any strong emission. The above spectrum change was discussed in relation to the coordination around Eu2+.