Structure and persistent luminescence of novel Pr-doped Mg3Lu2Ge3O12 garnet
Source abstract
Abstract
Garnet-based materials are widely investigated for applications in optics. In this research, we report the structure and spectroscopic properties of novel Mg$_3$Lu$_2$Ge$_3$O$12$: Pr$3+$ garnet that exhibits orange persistent luminescence. The atomic positions of Mg$_3$Lu$_2$Ge$_3$O$12$ were calculated using Rietveld refinement. The local structure analysis using extended X-ray absorption fine structure (EXAFS) and site-selective spectroscopy revealed that activator ions predominantly incorporate in the Lu$3+$ position. The persistent luminescence processes in Mg$_3$Lu$_2$Ge$_3$O$12$: Pr$3+$ were analysed using photoluminescence (PL), thermostimulated luminescence (TSL), and electron paramagnetic resonance (EPR) spectroscopy methods. The comparison of PL and persistent luminescence spectra imply that electron and hole traps are filled due to the photoionization of Pr$3+$ ions. Two paramagnetic defects related to O- sites were detected after the excitation. TSL analysis indicates a quasi-continuous charge trap distribution ranging from 0.57 to 1.51 eV in the investigated host, enabling efficient persistent luminescence. The persistent luminescence mechanism of Mg$_3$Lu$_2$Ge$_3$O$12$: Pr$3+$ is proposed.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Luminescence Properties of Advanced Materials · Lanthanide and Transition Metal Complexes · Glass properties and applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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