Cao Chunyan, Luo Zhiyang, Guo Siling, Cao Renping, Noh Hyeon Mi, Jeong Jung Hyun, Xie An
College of Mathematics and Physics, Jinggangshan University, Ji'an 343009, China.
College of Mechanical Manufacture and Automation, Jinggangshan University, Ji'an 343009, China.
Spectrochim Acta A Mol Biomol Spectrosc. 2014 Dec 10;133:457-62. doi: 10.1016/j.saa.2014.06.050. Epub 2014 Jun 14.
Through a solid-state reaction method, the Ce(3+)/Tb(3+) co-doped MyGdFx (M=Li, Na, K; x=3, 4, 6; y=0, 1, 3) system samples have been synthesized by controlling the annealing temperatures and the ratios of raw materials. The samples were characterized by X-ray diffraction (XRD) patterns, photoluminescence (PL) excitation and emission spectra as well as luminescent dynamic decay curves. The experimental results suggest that the LiF is more difficult to react with the prepared material compared that of NaF or KF under similar reaction conditions. The samples crystallized in different crystalline phases. The energy transfer from Ce(3+) to Tb(3+) or Ce(3+) to Gd(3+) to Tb(3+) has been observed in all the samples. The Ce(3+) and Tb(3+) present different optical properties for they are sensitive to the local environment. In addition, the deduced lifetime of Tb(3+)(5)D4→(7)F5 transition decreases in the same system samples with the annealing temperature increasing. The deduced lifetime of Tb(3+)(5)D4→(7)F5 also decreases with the increase of the KF concentration in the KF system samples.
通过固态反应法，通过控制退火温度和原料比例合成了Ce(3+)/Tb(3+)共掺杂的MyGdFx（M = Li、Na、K；x = 3、4、6；y = 0、1、3）体系样品。通过X射线衍射（XRD）图谱、光致发光（PL）激发和发射光谱以及发光动态衰减曲线对样品进行了表征。实验结果表明，在相似的反应条件下，与NaF或KF相比，LiF与所制备材料的反应更困难。样品结晶为不同的晶相。在所有样品中均观察到了从Ce(3+)到Tb(3+)或从Ce(3+)到Gd(3+)再到Tb(3+)的能量转移。Ce(3+)和Tb(3+)呈现出不同的光学性质，因为它们对局部环境敏感。此外，在同一体系样品中，随着退火温度的升高，Tb(3+)(5)D4→(7)F5跃迁的推断寿命缩短。在KF体系样品中，随着KF浓度的增加，Tb(3+)(5)D4→(7)F5的推断寿命也缩短。
