Zhao Dan, Zhu Shuang-Yin, Zhang Rui-Juan, Yao Qing-Xia, Liu Wen, Xue Ya-Li
College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo, Henan 454000, China.
State Key Laboratory of Structural Chemistry, Fuzhou, Fujian 350002, China.
Inorg Chem. 2021 Dec 6;60(23):17942-17951. doi: 10.1021/acs.inorgchem.1c02460. Epub 2021 Nov 11.
Within Mn-activated phosphors, the oxidation state of Mn dopant strongly depends on the structural features of the host lattice. This paper reported a new polymorph of CsMg(PO) (CMP) with a complicated three-dimensional (3D) framework of [Mg(PO)] that is constructed by MgO octahedra and 1D infinite [PO] chains. Then we prepared a series of red phosphors CsMg(PO):Mn (CMP:Mn) by high temperature solid state reactions in the open air. Powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and photoluminescence (PL) studies revealed the single Mn-oxidation. Under 404 nm light exciting, CMP:0.2Mn can emit single-band emission at around 630 nm with full-width at half-maximum (fwhm) of 70 nm. Besides, CMP:0.2Mn possesses excellent thermostability up to 450 K. These features indicate that CMP:0.2Mn is suitable to be used for LED backlight display. Moreover, this work suggests that a host lattice with suitable structure feature can form single Mn-oxidation and is rigid enough to protect Mn from being oxidized by O at high temperature.
在锰激活的磷光体中，锰掺杂剂的氧化态强烈依赖于主体晶格的结构特征。本文报道了一种新型的CsMg(PO)（CMP）多晶型物，其具有由MgO八面体和一维无限[PO]链构成的复杂三维（3D）[Mg(PO)]骨架。然后我们通过在空气中进行高温固态反应制备了一系列红色磷光体CsMg(PO):Mn（CMP:Mn）。粉末X射线衍射（XRD）、X射线光电子能谱（XPS）和光致发光（PL）研究揭示了单一的锰氧化态。在404 nm光激发下，CMP:0.2Mn可在630 nm左右发射单带发射，半高宽（fwhm）为70 nm。此外，CMP:0.2Mn在高达450 K时具有优异的热稳定性。这些特性表明CMP:0.2Mn适用于LED背光显示。此外，这项工作表明具有合适结构特征的主体晶格可以形成单一的锰氧化态，并且足够刚性以保护锰在高温下不被O氧化。
