Abstract Light-emitting organic semiconductors have attracted considerable attention for the nanoscale fabrication of organic-based displays and their potential application in optoelectronics, plasmonics, and photonics. In this study, core-shell hybrid nanostructures of organic rubrene coated on Ag nanoparticles (NPs) have been synthesized using a chemical reduction method. The thickness of the rubrene shell was 2.6–6.0 nm and the diameter of the Ag core was 30–70 nm. The optical and structural properties of the Ag/rubrene core-shell NPs were tuned by hydrothermal (HT) treatment at 190 °C. The Ag/rubrene core-shell NPs were characterized by high-resolution transmission electron microscopy and energy-dispersive X-ray (EDX) spectroscopy before and after the HT treatment, and their structural properties were confirmed through X-ray diffraction (XRD) analysis. XRD peaks related to an orthorhombic phase were observed along with the original triclinic crystal structure of the rubrene shell, and the triclinic crystal domain size increased from 28.2 nm to 30.8 nm owing to the HT treatment. Interestingly, the green light emission (λem = 550 nm) of the Ag/rubrene core-shell NPs changed to blue light emission (λem = 425 nm), increasing in intensity through the HT treatment. This is caused by the crystal change with H-type aggregation and enhanced energy transfer from a surface plasmon resonance.

中文翻译：

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通过水热处理增强蓝色光致发光和银/有机红荧烯核壳纳米粒子的新结晶度

摘要 发光有机半导体在有机基显示器的纳米级制造及其在光电子学、等离子体学和光子学中的潜在应用引起了相当大的关注。在这项研究中，使用化学还原方法合成了涂覆在 Ag 纳米粒子 (NPs) 上的有机红荧烯的核壳混合纳米结构。红荧烯壳的厚度为 2.6-6.0 nm，Ag 核的直径为 30-70 nm。Ag/红荧烯核壳 NPs 的光学和结构特性通过 190°C 的水热 (HT) 处理进行调整。Ag/红荧烯核壳 NPs 在 HT 处理前后通过高分辨率透射电子显微镜和能量色散 X 射线 (EDX) 光谱表征，并通过 X 射线衍射 (XRD) 分析证实了它们的结构特性。与红荧烯壳的原始三斜晶体结构一起观察到与正交相相关的 XRD 峰，并且由于 HT 处理，三斜晶畴尺寸从 28.2 nm 增加到 30.8 nm。有趣的是，Ag/红荧烯核壳 NPs 的绿光发射 (λem = 550 nm) 变为蓝光发射 (λem = 425 nm)，通过 HT 处理强度增加。这是由 H 型聚集的晶体变化和来自表面等离子体共振的增强的能量转移引起的。由于HT处理，8nm。有趣的是，Ag/红荧烯核壳 NPs 的绿光发射 (λem = 550 nm) 变为蓝光发射 (λem = 425 nm)，通过 HT 处理强度增加。这是由 H 型聚集的晶体变化和来自表面等离子体共振的增强的能量转移引起的。由于HT处理，8nm。有趣的是，Ag/红荧烯核壳 NPs 的绿光发射 (λem = 550 nm) 变为蓝光发射 (λem = 425 nm)，通过 HT 处理强度增加。这是由 H 型聚集的晶体变化和来自表面等离子体共振的增强的能量转移引起的。