Department of Applied Physics, Indian School of Mines, Dhanbad, India.
J Fluoresc. 2013 May;23(3):439-50. doi: 10.1007/s10895-013-1160-7. Epub 2013 Jan 18.
This paper reports the structural and optical properties of rare earth doped and codoped yttrium oxide nanophosphors. Dysprosium (Dy(3+)) and Terbium (Tb(3+)) doped and codoped yttrium oxide (Y2O3) phosphors were prepared by combustion synthesis method and subsequently annealed to high temperature to eliminate the hydroxyl group (-OH) and to get more crystallinity. The formation of compounds was confirmed by the X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR). The diffuse reflectance spectra (DRS) of doped and codoped Y2O3 powder phosphors were measured and it is observed that the absorption edge of the doped samples is shifted towards blue region with respect to undoped sample. The bandgap of the prepared samples were evaluated with the help of Kubelka-Munk function using Diffuse Reflectance Spectra (DRS) and an increase in bandgap was observed with the decrease in crystallite size. A strong characteristics emission from Tb(3+) and Dy(3+) ions was identified and the influence of doping concentration and annealing temperature on photoluminescence properties was systematically studied. Transfer of energy was observed in dysprosium-terbium codoped Y2O3 nanophosphor at room temperature from Dy(3+) ions to Tb(3+) ions.
本文报道了稀土掺杂和共掺杂氧化钇纳米荧光粉的结构和光学性质。采用燃烧合成法制备了掺镝（Dy(3+)）和掺铽（Tb(3+)）以及共掺氧化钇（Y2O3）荧光粉，并随后进行高温退火以消除羟基（-OH）并获得更高的结晶度。通过 X 射线衍射（XRD）和傅里叶变换红外光谱（FTIR）确认了化合物的形成。测量了掺杂和共掺杂 Y2O3 粉末荧光粉的漫反射光谱（DRS），观察到掺杂样品的吸收边相对于未掺杂样品向蓝色区域移动。借助漫反射光谱（DRS）中的 Kubleka-Munk 函数评估了制备样品的能带隙，并且随着晶粒尺寸的减小，观察到能带隙增加。从 Tb(3+)和 Dy(3+)离子中鉴定出强特征发射，并且系统研究了掺杂浓度和退火温度对光致发光性能的影响。在室温下，从 Dy(3+)离子到 Tb(3+)离子观察到了在掺镝-铽共掺杂氧化钇纳米荧光粉中的能量转移。
