Structural Investigation and Energy Transfer of Eu/Mn Co-Doped MgGaSnO Phosphors for Multifunctional Applications.

In recent years, rare earth ion and transition metal ion co-doped fluorescent materials have attracted a lot of attention in the fields of WLEDs and optical temperature sensing. In this study, I successfully prepared the dual-emission MgGaSnO:Eu,Mn red phosphors and the XRD patterns and refinement results show that the prepared phosphors belong to the Fd-3m space group. The energy transfer process between Eu and Mn was systematically investigated by emission spectra and decay curves of MgGaSnO:0.12Eu,yMn (0.002 ≤ y ≤ 0.012) phosphors and the maximum value of transfer efficiency can reach 71.2%. Due to the weak thermal quenching effect of Eu, its emission provides a stable reference for the rapid thermal quenching of the Mn emission peak, thereby achieving good temperature measurement performance. The relative thermometric sensitivities of the fluorescence intensity ratio and fluorescence lifetime methods reached a maximum value of 2.53% K at 448 K and a maximum value of 3.38% K at 473 K. In addition, the prepared WLEDs utilizing MgGaSnO:0.12Eu phosphor have a high color rendering index of 82.5 and correlated color temperature of 6170 K. The electroluminescence spectrum of the synthesized red LED device by MgGaSnO:0.009Mn phosphor highly overlaps with the absorption range of the phytochrome P and thus can effectively promote plant growth. Therefore, the MgGaSnO:Eu,Mn phosphors have good application prospects in WLEDs, temperature sensing, and plant growth illumination.