Abstract We report the synthesis of Sm3+ doped MoO3 nanostructures (NSs) effectively by hydrothermal route using lysine as surfactant. The hexagonal and orthorhombic phases were confirmed by means of Powder X-ray diffraction (PXRD) results. The effect of hydrothermal reactions, such as reaction temperature, surfactant concentration, pH value on the morphology was studied in detail by utilizing scanning electron microscopy (SEM) results. Optical properties of the Sm3+ (1–9 mol %) doped MoO3 were studied by means of diffuse reflectance spectroscopy (DRS). The 4f-4f emission bands of Sm3+ ions were observed at 563, 610, 647 and 698 nm attributed to 4G5/2–6HJ (J = 5/2, 7/2, 9/2, 11/2) of Sm3+ respectively under 409 nm excitation. Judd–Ofelt theory was utilized to calculate the, transition probabilities (AT), radiative lifetime (τrad), branching ratio (β), and asymmetric ratio (A21) by using the intensity parameters. The average quantum efficiency and color purity values of the prepared samples were found to be ∼79.61% and 97% respectively. The CIE color coordinates confirmed that the phosphor emits orange-red light, which were quite useful for the fabrication of white light emitting diodes.

中文翻译：

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赖氨酸辅助水热合成及分层结构MoO 3 :Sm 3+ 荧光粉的形成及其电子俘获发光特性

摘要 我们报道了使用赖氨酸作为表面活性剂通过水热法有效合成 Sm3+ 掺杂的 MoO3 纳米结构 (NSs)。通过粉末 X 射线衍射 (PXRD) 结果证实了六方相和正交相。利用扫描电子显微镜(SEM)结果详细研究了水热反应的影响，如反应温度、表面活性剂浓度、pH值对形貌的影响。通过漫反射光谱 (DRS) 研究了 Sm3+ (1–9 mol%) 掺杂的 MoO3 的光学性质。在 563、610、647 和 698 nm 处观察到 Sm3+ 离子的 4f-4f 发射带，分别归因于 Sm3+ 的 4G5/2–6HJ（J = 5/2、7/2、9/2、11/2） 409 nm 激发。Judd-Ofelt 理论用于计算跃迁概率 (AT)、辐射寿命 (τrad)、通过使用强度参数，分支比 (β) 和不对称比 (A21)。发现制备的样品的平均量子效率和色纯度值分别为~79.61% 和 97%。CIE 颜色坐标确认荧光粉发出橙红色光，这对于制造白色发光二极管非常有用。