Effects of Impurity Doping on the Luminescence Performance of Mn4+-Doped Aluminates with the Magnetoplumbite-Type Structure for Plant Cultivation.
Xiaoshuang LiZikun ChenBo WangRuizhao LiangYongting LiLei KangPeng-Fei LiuPublished in: Materials (Basel, Switzerland) (2018)
Mn4+ activated LaMgAl11O19 (LMA/Mn4+) with red emitting phosphor was obtained by sintering under air conditioning. The X-ray diffraction pattern Rietveld refinement results reveal that three six-fold coordinated Al sites are substituted by Mn4+ ions. Furthermore, the chemical valence state of manganese in the LMA host was further confirmed through X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR). Photoluminescence emission (PL) and excitation (PLE) spectra of LMA/Mn4+ as well as the lifetime were measured, and the 663 nm emission is ascribed to the ²Eg→⁴A2g from the 3d³ electrons in the [MnO₆]8- octahedral complex. The emission spectrum matches well with the absorption of phytochrome. Temperature-dependent PL spectra show that the color changes of the phosphor at 420 K are 0.0110 for Δx and -0.0109 for Δy. Moreover, doping Zn2+ and Mg2+ ions in the host enhances the emission intensity of Mn4+ ions. These results highlight the potential of LMA/Mn4+ phosphor for a light-emitting diode (LED) plant lamp.
Keyphrases
- light emitting
- energy transfer
- quantum dots
- transition metal
- room temperature
- metal organic framework
- high resolution
- solid state
- sensitive detection
- gene expression
- density functional theory
- aqueous solution
- molecular dynamics
- electron microscopy
- genome wide
- heavy metals
- climate change
- single molecule
- mass spectrometry