Carbon Nanodots with Sub-Nanosecond Spontaneous Emission Lifetime

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• 作者：Cheng-Wei Liu ; Dr. Tzu-Neng Lin ; Li-Yun Chang ; Zh-Cheng Jiang ; Prof. Ji-Lin Shen ; Dr. Po-Wen Chen ; Prof. Jyh-Shyang Wang and Prof. Chi-Tsu Yuan
• 刊名：ChemPhysChem
• 出版年：2017
• 出版时间：January 4, 2017
• 年：2017
• 卷：18
• 期：1
• 页码：42-46
• 全文大小：854K
• ISSN：1439-7641

文摘

Compared with most mature cadmium-containing quantum dots (QDs), carbon nanodots (CNDs) are a new class of colloidal nanomaterials that exhibit unique photoluminescence (PL) properties while being nontoxic and easily manufactured using low-cost precursor materials. However, solid-state CNDs exhibit poor PL quantum yields (PL-QYs) and inefficient radiative transition, which significantly hinders their practical use in optoelectronic devices. To address this issue, plasmonic nanoantennas consisting of Au nanorods (Au-NRs) deposited on a flat Au film with inserted dielectric layers were used to enhance the spontaneous emission of solid-state CNDs with broad spectral linewidth. Using steady-state, time-resolved, and spatial-resolved PL measurements, we found that after coupling to plasmonic nanogaps (PNGs), the PL emission was significantly enhanced, accompanied by a PL lifetime shortening to the sub-nanosecond range (≈140 ps). According to the experimental data, the radiative transition is strongly accelerated and can thus overcome the metal loss, leading to a large PL enhancement. Our demonstration can pave the way to the design of eco-friendly nanoemitters with sub-nanosecond PL lifetime for promising applications in light-emitting devices.