Abstract K2SiF6:Mn4+/g-C3N4 (KSF/g-C3N4) composite phosphors were directly synthesized by pretreatment of raw materials. This way avoided the damage to the luminescent properties of phosphors compared with the conventional method for preparing composites. The structure, morphology, and composition of K2SiF6:Mn4+/g-C3N4 samples were investigated by X-ray Diffraction (XRD), Energy Dispersive Spectrometer (EDS) and Scanning Electron Microscope (SEM). Fluorescence and UV–Vis absorption spectra have also been measured to study their optical properties. By combine with g-C3N4, the absorption intensity of composite is greatly increased in the UV–Vis range, while its luminous intensity is also significantly enhanced. This is owing to g-C3N4 increases the absorption capacity of the phosphor for UV–Vis light, and the overlap of the two emission spectra and excitation spectra promoted energy transfer to K2SiF6:Mn4+ phosphors.

中文翻译：

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通过与 g-C3N4 耦合改善深红色发光 K2SiF6:Mn4+ 荧光粉的发光性能，用于暖白光 LED

摘要 K2SiF6:Mn4+/g-C3N4（KSF/g-C3N4）复合荧光粉是通过对原料进行预处理直接合成的。与传统的复合材料制备方法相比，这种方式避免了对荧光粉发光性能的损害。通过 X 射线衍射 (XRD)、能谱仪 (EDS) 和扫描电子显微镜 (SEM) 研究了 K2SiF6:Mn4+/g-C3N4 样品的结构、形貌和组成。还测量了荧光和紫外-可见吸收光谱以研究它们的光学特性。通过与g-C3N4结合，复合材料在UV-Vis范围内的吸收强度大大增加，同时其发光强度也显着增强。这是由于 g-C3N4 增加了荧光粉对 UV-Vis 光的吸收能力，