The effect of Al³⁺ substitution on the enhancement of the luminescence of Lu_1–xAl_xNbO₄:Eu³⁺ and Lu_1–xAl_xNbO₄:Tb³⁺ was investigated. X-ray diffraction patterns confirmed that the Eu³⁺, Tb³⁺, and Al³⁺ ions were fully incorporated into the Lu³⁺ sites. In the case of Lu_1–xAl_xNbO₄:Eu³⁺, the predominant red emission (614 nm) was assigned to the ⁵D₀ → ⁷F₂ transition of Eu³⁺ and for x = 0–0.05, its intensity increased up to ~125 and 108% under 395 nm (⁷F₀ → ⁵L₆) and a charge transfer band excitation, respectively. For Lu_1–xAl_xNbO₄:Tb³⁺, the strongest emission band peaking at 551 nm was attained in the green region among multiple emission bands corresponding to the ⁵D₄ → ⁷F_J transitions of Tb³⁺. Increasing the x values from 0 to 0.05 increased the green emission significantly by ~137%. These phenomena were explained by the local structural distortions and crystal field asymmetry surrounding Eu³⁺ and Tb³⁺, which were attributed to a large difference in the ionic radii of Al³⁺ and Lu³⁺.

研究了Al ³⁺取代对Lu _{1– x} Al _x NbO ₄：Eu ³⁺和Lu _{1– x} Al _x NbO ₄：Tb ³⁺发光增强的影响。X射线衍射图证实Eu ³⁺，Tb ³⁺和Al ³⁺离子完全掺入Lu ³⁺位。在Lu _{1– x} Al _x NbO ₄：Eu ^{3+的情况下}，主要的红色发射（614 nm）被分配给⁵Eu ^3+的D ₀  →  ⁷ F ₂跃迁，并且对于x  = 0-0.05，在395 nm（⁷ F ₀ → ⁵ L ₆）和电荷转移带激发下，其强度分别增加至〜125和108％。对于Lu _{1– x} Al _x NbO ₄：Tb ³⁺，在对应于Tb ³⁺的⁵ D ₄  →  ⁷ F _J跃迁的多个发射带中的绿色区域中，在551 nm处达到了最强的发射带峰。  。增加X从0至0.05的值由〜137％显著增加了的绿色发光。这些现象可以通过Eu ³⁺和Tb ³⁺周围的局部结构变形和晶体场不对称来解释，这是由于Al ³⁺和Lu ³⁺的离子半径存在很大差异。