Carbonate intercalated Zn-Fe layered double hydroxide (LDH) with Zn²⁺/Fe³⁺ molar ratios 2, 3 and 4 were synthesized by coprecipitation in order to study the photoluminescent (PL) properties of their colloids with various wt.% of LDH in formamide. These synthesized LDHs were characterized by various techniques including x-ray diffraction analysis (XRD), Fourier-transform infrared spectroscopy (FTIR), field emission scanning electron mMicroscopy (FE-SEM), energy-dispersive x-ray spectroscopy (EDS), high-resolution transmission electron microscopy (HR-TEM), and photoluminescence spectroscopy (PL). The rhombohedral phase and crystallite size of Zn-Fe LDH were confirmed by XRD. Crystallite size plays an important role in the PL mechanism. HR-TEM showed hexagonal nanosheets with 5–6 nm average particle size. To investigate the PL mechanism of pristine LDH and their colloids, these prepared Zn-Fe LDHs were exfoliated in formamide by varying their Zn²⁺/Fe³⁺ molar ratios (2,3, 4) and LDH concentration (0.2 wt.%, 0.4 wt.%, 0.6 wt.%, 0.8 wt.% of LDH). Results revealed that surface charge density and surface defects are the main reasons for PL generation in LDH colloids.

碳酸盐插入Zn ²⁺ / Fe ^3+的Zn-Fe层状双氢氧化物（LDH）通过共沉淀合成摩尔比2、3和4，以研究其胶体与甲酰胺中LDH的各种重量百分比的胶体的光致发光（PL）性质。这些合成的LDH通过各种技术进行表征，包括X射线衍射分析（XRD），傅立叶变换红外光谱（FTIR），场发射扫描电子显微镜（FE-SEM），能量色散X射线光谱（EDS），高分辨率透射电子显微镜（HR-TEM）和光致发光光谱（PL）。XRD证实了Zn-Fe LDH的菱面相和微晶尺寸。微晶尺寸在PL机理中起着重要作用。HR-TEM显示六边形纳米片的平均粒径为5-6 nm。为了研究原始LDH及其胶体的PL机制，²⁺ / Fe ³⁺摩尔比（2,3，4）和LDH浓度（LDH的0.2 wt。％，0.4 wt。％，0.6 wt。％，0.8 wt。％）。结果表明，表面电荷密度和表面缺陷是LDH胶体中PL生成的主要原因。