Li Xiaoshuang, Chen Zikun, Wang Bo, Liang Ruizhao, Li Yongting, Kang Lei, Liu Pengfei
School of Applied Physics and Materials, Wuyi University Jiangmen, Jiangmen 529020, China.
Dongguan Neutron Science Center, Dongguan 523803, China.
Materials (Basel). 2018 Dec 27;12(1):86. doi: 10.3390/ma12010086.
Mn activated LaMgAlO (LMA/Mn) 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 Mn 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/Mn as well as the lifetime were measured, and the 663 nm emission is ascribed to the ²E→⁴A from the 3³ electrons in the [MnO₆] 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 Zn and Mg ions in the host enhances the emission intensity of Mn ions. These results highlight the potential of LMA/Mn phosphor for a light-emitting diode (LED) plant lamp.
通过在空调环境下烧结获得了具有红色发光磷光体的锰激活的镧镁铝酸盐（LMA/Mn）。X射线衍射图谱的Rietveld精修结果表明，三个六配位的铝位点被锰离子取代。此外，通过X射线光电子能谱（XPS）和电子顺磁共振（EPR）进一步证实了LMA基质中锰的化学价态。测量了LMA/Mn的光致发光发射（PL）和激发（PLE）光谱以及寿命，663nm发射归因于[MnO₆]八面体络合物中3³电子的²E→⁴A。发射光谱与光敏色素的吸收很好地匹配。温度依赖的PL光谱表明，在420K时磷光体的颜色变化对于Δx为0.0110，对于Δy为-0.0109。此外，在基质中掺杂锌和镁离子增强了锰离子的发射强度。这些结果突出了LMA/Mn磷光体用于发光二极管（LED）植物灯的潜力。
