摘要
采用水热法添加醋酸钠制备了纳米羟基氧化镓(GaOOH)粉体和纳米GaOOH:Eu3+荧光粉,使用透射电镜(TEM)、扫描电镜(SEM)、X射线衍射仪(XRD)和荧光分光光度计对产物的形貌、晶相和发光性质进行了检测,结果发现醋酸钠(NaAc)在控制晶体粒径和形貌方面起到了非常重要的作用。在140℃水热条件下,未添加醋酸钠下得到的是纺锤体GaOOH,添加醋酸钠得到的是立方体块状GaOOH,在170℃水热条件下,添加醋酸钠得到的是纳米GaOOH粉体,平均粒径约为5nm,并简单讨论了不同形貌GaOOH的生长机制。比较不同温度添加醋酸钠制备的GaOOH:Eu3+荧光粉的发光性质发现,170℃得到的GaOOH:Eu3+发光强度>140℃的样品,不同掺杂浓度发光性能结果表明Eu3+浓度为10%(摩尔分数)发光强度最高,是已报道的掺杂浓度的4倍,在掺杂浓度为15%(摩尔分数)观察到了浓度猝灭现象。
Nano-sized GaOOH and GaOOH：Eu3＋grains have been successfully synthesized by hydrothermal method by adding NaAc at 170℃.The as-synthesized product was characterized by X-ray diffraction,transmission electron microscopy （TEM）,scanning electron microscopy （SEM）,and fluorescence spectrophotometer.From the experimental results,it was revealed that NaAc played an important role in the formation of the samples with different morphologies and sizes.The GaOOH obtained at 140℃ are cubic crystals and GaOOH obtained at 170℃ are nanoparticles of 5nm.The growing mechanism of GaOOH with or without NaAc at different temperatures was discussed in the paper.Compare the GaOOH：Eu3＋ obtained at different temperatures,the corresponding emission intensity of GaOOH：Eu3＋ prepared at 170℃ was higher than that of 140℃.When the doping concentration is 10mol%,the sample has the highest emission intensity which is 4 times of the results that have been reported and concentration quenching was observed when the doping concentration reached 15mol%.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2010年第7期1286-1289,共4页
Journal of Functional Materials
基金
国家自然科学基金资助项目(50772133)
