Hien N T, Kien N T, Yen V H, Ngoc T, Do P V, Phuc V X, Ca N X
Institute of Science and Technology, TNU - University of Sciences Thai Nguyen Vietnam
Faculty of Engineering and Technology, TNU - University of Information and Communication Technology Thai Nguyen Vietnam.
Nanoscale Adv. 2024 Aug 26;6(22):5598-611. doi: 10.1039/d4na00537f.
CoAlO:Dy nanocrystals ( = 0, 0.1, 0.5, 1.0, and 3.0 mol%) with spinel structures were prepared using the co-precipitation method. The crystal structure, optical properties, and presence of elements were respectively analyzed using X-ray diffraction, photoluminescence excitation, photoluminescence spectra, luminescence lifetime, and X-ray photoelectron spectroscopy. The influence of temperature on material fabrication was studied using differential scanning calorimetry and thermogravimetric techniques. The color characteristics of Dy luminescence in the CoAlO host were evaluated using CIE chromaticity coordinates and correlated color temperature. For the first time, the electronic dipole transitions in the photoluminescence excitation spectra were used to calculate the optical parameters of Dy ions in the CoAlO host using Judd-Ofelt theory. The Inokuti-Hirayama model was used to explain the energy transfer process between Dy ions, the main interaction mechanism, and energy transfer parameters for the luminescence of Dy ions.
采用共沉淀法制备了具有尖晶石结构的CoAlO:Dy纳米晶体（Dy含量分别为0、0.1、0.5、1.0和3.0 mol%）。分别使用X射线衍射、光致发光激发、光致发光光谱、发光寿命和X射线光电子能谱对晶体结构、光学性质和元素存在情况进行了分析。使用差示扫描量热法和热重技术研究了温度对材料制备的影响。使用CIE色度坐标和相关色温评估了Dy在CoAlO基质中的发光颜色特性。首次利用光致发光激发光谱中的电子偶极跃迁，采用Judd-Ofelt理论计算了Dy离子在CoAlO基质中的光学参数。采用Inokuti-Hirayama模型解释了Dy离子之间的能量转移过程、主要相互作用机制以及Dy离子发光的能量转移参数。
