This work deals with the spectroscopic properties of praseodymium doped single crystalline lutetium aluminum garnet (LuAG:Pr³⁺). A special focus was set on temperature- and time-dependent spectroscopy. Beyond the well-known down-conversion luminescence of LuAG:Pr³⁺, also UV-A/B up-conversion luminescence under excitation with a 488 nm laser was thoroughly investigated. Furthermore, the results of the spectroscopic investigations on the single crystalline material were supplemented and compared with measurements on a microscale powder sample.

In addition, to the spectroscopic investigations, mechanistic considerations are presented to obtain a closer look at the up-conversion process in LuAG:Pr³⁺. We promote the thesis of a temperature-dependent energy transfer up-conversion mechanism.

这项工作涉及do掺杂的单晶铝石榴石（LuAG：Pr ³⁺）的光谱性质。特别着重于温度和时间相关光谱。除了众所周知的LuAG：Pr ³⁺下转换发光外，还对488 nm激光激发下的UV-A / B上转换发光进行了深入研究。此外，对单晶材料的光谱研究结果得到了补充，并与微粉状样品的测量结果进行了比较。

此外，在光谱研究中，还提出了机械方面的考虑，以便更仔细地观察LuAG：Pr ³⁺中的上转换过程。我们提出了一种与温度有关的能量转移上转换机理的论文。