Abstract：
In this study, an investigation was conducted on the structural and photoluminescence (PL) characteristics of LaAl2B4O10 (LAB) phosphors initially incorporated with Dy3+ and Eu3+ ions. Subsequently, the impact of varying Eu3+ concentration while maintaining a constant Dy3+ concentration was examined. Structural characterization was performed using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and energy-dispersive X-ray spectroscopy (EDS). XRD analysis confirmed the effective embedding of both dopants into the hexagonal framework of the LAB. The PL emission spectra revealed characteristic emissions of Dy3+ (blue and yellow) and Eu3+ (red) ions. The optimized dopant concentrations of both Dy3+ and Eu3+ were observed to be 3 wt%. The dominant mechanism for concentration quenching in doped LAB phosphors was determined to be the electric dipole-dipole interaction. Co-doping with Eu3+ led to a substantial decrease in Dy3+ emission intensity (∼0.18-fold) while enhancing Eu3+ emission intensity (∼3.72-fold). The critical energy transfer distance (RC = 11.64 Å) and the analysis based on the Dexter theory confirmed that the energy transfer mechanism corresponds to dipole-dipole interaction. The color purities and correlated color temperatures (CCT) were estimated, suggesting the potential of these phosphors for warm white and red lighting applications, respectively. The observed energy transfer and luminescence properties, along with the structural and compositional characterization, highlight the promising potential of LAB:Dy3+/Eu3+ co-doped phosphors for advanced lighting and display technologies.
摘要：
在这项研究中,对最初掺入Dy3和Eu3离子的LaAl2B4O10（LAB）磷光体的结构和光致发光（PL）特性进行了研究。随后，检查了在保持恒定的Dy3+浓度的同时改变Eu3+浓度的影响。使用X射线衍射（XRD）进行结构表征，傅里叶变换红外光谱(FTIR),和能量色散X射线光谱（EDS）。XRD分析证实了两种掺杂剂有效地嵌入到LAB的六边形框架中。PL发射光谱揭示了Dy3（蓝色和黄色）和Eu3（红色）离子的特征发射。观察到Dy3+和Eu3+的优化掺杂剂浓度均为3重量%。确定了掺杂LAB磷光体中浓度猝灭的主要机制是电偶极子-偶极子相互作用。与Eu3+共掺杂导致Dy3+发射强度大幅下降(~0.18倍)，同时增强Eu3+发射强度(~3.72倍)。临界能量转移距离（RC=11.64µ）和基于Dexter理论的分析证实，能量转移机制对应于偶极-偶极相互作用。估计了颜色纯度和相关色温(CCT)，表明这些磷光体在暖白色和红色照明应用中的潜力，分别。观察到的能量传递和发光特性，随着结构和成分的表征，突出了LAB：Dy3+/Eu3+共掺杂荧光粉用于先进照明和显示技术的潜力。
