Abstract This study demonstrates the optical properties of ZnS:Mn2+ qquantum dots synthesized by simple and eco-friendly chemical precipitation method using aloe vera (AV) extract as the stabilizing agent. The nanoparticles have been characterized by transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectroscopy, diffuse reflectance spectroscopy (DRS), photoluminescence (PL) and time-resolved PL spectroscopy. Increase in band gap energy with decrease in particle size was observed from DRS studies due to quantum confinement effect. Dominant yellow emission was observed from characteristic 4T1→6A1 transitions of the Mn2+ions in the ZnS:Mn/AV nanoparticles. The results provide insight to the quantum confinement effect that occur and how it affect decay life time of the ZnS:Mn2+/AV nanoparticles.

中文翻译：

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高度发光的 ZnS:Mn 量子点覆盖有芦荟提取物

摘要 本研究展示了以芦荟 (AV) 提取物为稳定剂，通过简单且环保的化学沉淀法合成的 ZnS:Mn2+ qquantum 点的光学性质。纳米粒子已通过透射电子显微镜 (TEM)、傅里叶变换红外 (FTIR) 光谱、漫反射光谱 (DRS)、光致发光 (PL) 和时间分辨 PL 光谱进行表征。由于量子限制效应，从 DRS 研究中观察到带隙能量随着颗粒尺寸的减小而增加。从 ZnS:Mn/AV 纳米粒子中 Mn2+ 离子的特征 4T1→6A1 跃迁观察到主要的黄色发射。结果提供了对发生的量子限制效应及其如何影响 ZnS:Mn2+/AV 纳米粒子的衰变寿命的深入了解。