The phenomenon of persistent luminescence in the phosphors Zn₂SnO₄ doped by Cr³⁺ and codoped by Al³⁺ or Eu³⁺ is related to the energy levels of the doping transition ions Cr³⁺ and rare earth ions Eu³⁺, the concentration of Al³⁺ substituting Zn and Sn, the intrinsic defects and the energy bands of the Zn₂SnO₄ matrix. To fully understand the procedure of persistent luminescence in these phosphors, we firstly determine the role of the Cr³⁺ ions in this process. For this reason, a crystal-field theory, using the Racah tensor algebra method, of the optical region associated to the transitions between the Stark levels of Cr³⁺ in these phosphors was performed. We examine then the influence by codoping with Al³⁺ and Eu³⁺ on the persistent luminescence process. In the second step, we analyze the role of the traps after discussing some of these properties. Finally, we propose an energy transfer mechanism from PLE, PL spectra and TL curves.

Cr ³⁺掺杂和Al ³⁺或Eu ³⁺共掺杂的Zn ₂ SnO ₄荧光粉的持续发光现象与掺杂过渡离子Cr ³⁺和稀土离子Eu ³⁺的能级有关， Al ³⁺取代Zn和Sn的浓度，Zn ₂ SnO ₄基体的本征缺陷和能带。为了充分理解这些荧光粉中持续发光的过程，我们首先确定了 Cr ³⁺这个过程中的离子。为此，使用拉卡张量代数方法，对与这些磷光体中 Cr ³⁺的斯塔克能级之间的跃迁相关的光学区域进行了晶体场理论。然后我们检查了与 Al ³⁺和 Eu ³⁺共掺杂对持续发光过程的影响。在第二步中，我们在讨论了这些特性后分析了陷阱的作用。最后，我们从 PLE、PL 光谱和 TL 曲线提出了一种能量转移机制。