Xi Luqing, Pan Yuexiao, Huang Shaoming, Lian Hongzhou, Lin Jun
Key Laboratory of Carbon Materials of Zhejiang Province, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, P.R. China.
Dalton Trans. 2018 Apr 24;47(16):5614-5621. doi: 10.1039/c8dt00424b.
Herein, a novel red phosphor based on seven-coordinated Mn4+ ion-doped tridecafluorodizirconate, Na5Zr2F13 (NZF), has been synthesized by stirring a mixture of K2MnF6, NaF, and H2ZrF6 at room temperature. The crystal structure and morphology of the as-obtained phosphor NZF:Mn have been determined by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The composition and distribution of Mn4+ ions in NZF have been confirmed by energy-dispersive spectroscopy (EDS) and element mapping via transmission electron microscopy (TEM). The phosphor NZF:Mn exhibits a strong zero phonon line (ZPL) at 616 nm under excitation of blue light from a GaN light-emitting diode (LED) chip; this is attributed to the low symmetry of Mn4+ ions occupied in a seven-coordinated environment. The luminescence intensity of NZF:Mn has been optimized by controlling the synthesis procedure and synthetic parameters. The luminescence mechanism of the red phosphor NZF:Mn has been investigated according to the detailed experimental results. A warm white light has been produced by a WLED fabricated with the red phosphor NZF:Mn and the commercial yellow phosphor Y3Al5O12:Ce3+ (YAG:Ce) on a GaN LED chip.
在此，通过在室温下搅拌K2MnF6、NaF和H2ZrF6的混合物，合成了一种基于七配位Mn4+离子掺杂的十三氟二锆酸钠（Na5Zr2F13，NZF）的新型红色荧光粉。通过X射线衍射（XRD）和扫描电子显微镜（SEM）分别确定了所得荧光粉NZF:Mn的晶体结构和形貌。通过能量色散光谱（EDS）和透射电子显微镜（TEM）的元素映射确认了NZF中Mn4+离子的组成和分布。在来自氮化镓发光二极管（LED）芯片的蓝光激发下，荧光粉NZF:Mn在616 nm处表现出强烈的零声子线（ZPL）；这归因于占据七配位环境的Mn4+离子的低对称性。通过控制合成过程和合成参数，优化了NZF:Mn的发光强度。根据详细的实验结果研究了红色荧光粉NZF:Mn的发光机制。通过在氮化镓LED芯片上用红色荧光粉NZF:Mn和商用黄色荧光粉Y3Al5O12:Ce3+（YAG:Ce）制备的白光发光二极管（WLED）产生了暖白光。
