【摘要】 采用低温燃烧合成法制备了Gd2O3∶Eu3+纳米晶。用X射线衍射仪(XRD)、高分辨透射电子显微镜(HRTEM)和荧光光谱仪分别对样品的结构、形貌和发光性能进行了研究。结果表明,改变甘氨酸与稀土离子的比例(G/M)、退火温度可以制备出不同结构和晶粒尺寸的Gd2O3∶Eu3+纳米晶。在退火温度为800℃,G/M等于0.83和1.0时,均得到了纯立方相的Gd2O3∶Eu3+纳米晶,随着G/M的增加,Gd2O3∶Eu3+从立方相逐渐向单斜相转变。粉末的晶粒尺寸随着退火温度的增高而增大,晶粒尺寸在10~30 nm之间。立方相的Gd2O3∶Eu3+纳米晶主发射峰位置在612 nm(5D0→7F2跃迁),激发光谱中电荷迁移态发生了红移。更多还原

【Abstract】 Nanocrystalline Gd2O3 doped with europium was synthesized by the low-temperature combustion method.By using the X-ray diffraction(XRD),high resolution transmission electron microscopy(HRTEM),and fluorescence spectrophotometer,the structural,morphological and luminescence properties of the nanocrystal were investigated.The results show that by varying the glycine-to-metal nitrate(G/M) molar ratio and the annealing temperature,nanocrystalline Gd2O3∶Eu3+ with different structure and grain size could be achieved.The structure changed from cubic to monoclinic with the increment of G/M ratio after the samples had been calcined at 800 ℃ for 0.5 hour.When the G/M ratio was 0.83 and 1.0, the nanosized and pure cubic phase Gd2O3∶Eu3+ was produced.The crystalline size became bigger with increasing the annealing temperature.The grain size was about 10-30 nm.The main emission peak in cubic Gd2O3∶Eu3+ nanocrystal was at 612 nm(the 5D0→7F2 transition).In addition,a red shift for charge transfer state occurred in the excitation spectrum.更多还原