Professor C.N.R. Rao Centre for Advanced Materials Research, Tumkur University, Tumkur 572 103, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2012 Dec;99:279-87. doi: 10.1016/j.saa.2012.08.057. Epub 2012 Aug 27.
A series of Pr(3+) (1-9 mol%) doped CdSiO(3) nanophosphors have been prepared for the first time by a low temperature solution combustion method using oxalyldihydrizide (ODH) as a fuel. The final product was characterized by Powder X-ray diffraction (PXRD), Fourier Transform Infrared Spectroscopy (FTIR), scanning electron microscopy (SEM), and UV-Vis spectroscopy. The average crystallite size was calculated using Debye-Scherrer's formula and Williamson-Hall (W-H) plots and found to be in the range 31-37 nm. The optical energy band gap (E(g)) of undoped for Pr(3+) doped samples were estimated from Tauc relation which varies from 5.15-5.36 eV. Thermoluminescence (TL) properties of Pr(3+) doped CdSiO(3) nanophosphor has been investigated using γ-irradiation in the dose range 1-6 kGy at a heating rate of 5 °C s(-1). The phosphor shows a well resolved glow peak at ∼171 °C along with shouldered peak at 223 °C in the higher temperature side. It is observed that TL intensity increase with increase of Pr(3+) concentration. Further, the TL intensity at 171 °C is found to be increase linearly with increase in γ-dose which is highly useful in radiation dosimetry. The kinetic parameters such as activation energy (E), frequency factor (s) and order of kinetics was estimated by Luschiks method and the results are discussed.
一系列 Pr(3+)（1-9 mol%）掺杂的 CdSiO(3)纳米荧光粉首次通过低温溶液燃烧法用草酰二酰肼（ODH）作为燃料制备。最终产物通过粉末 X 射线衍射（PXRD）、傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）和紫外可见光谱进行了表征。平均晶粒尺寸通过德拜-谢勒公式和威廉姆森-霍尔（W-H）图计算，发现范围在 31-37nm 之间。未掺杂和掺杂 Pr(3+)的样品的光学能带隙（E(g)）通过 Tauc 关系估算，范围在 5.15-5.36eV 之间。通过在 1-6kGy 的剂量范围内以 5°C s(-1)的加热速率进行 γ 辐照，研究了 Pr(3+)掺杂 CdSiO(3)纳米荧光粉的热致发光（TL）性质。在较高温度侧，在约 171°C 处出现一个很好分辨的发光峰，同时在 223°C 处出现一个肩峰。观察到 TL 强度随 Pr(3+)浓度的增加而增加。此外，在 171°C 处的 TL 强度随 γ 剂量的增加呈线性增加，这在辐射剂量学中非常有用。通过卢奇克方法估算了动力学参数，如激活能（E）、频率因子（s）和动力学级数，并对结果进行了讨论。
