Graphene quantum dots (GQDs) are more promising than other kinds of semiconductor QDs because of their photostability and biocompatibility in different applications such as bioimaging, biosensing and light emitting diodes (LEDs). In addition, advances in random lasers (RLs) have led to an emerging desire for developing remote sensing and detecting strategies, lightning and imaging systems that are far cheaper, more precise and simpler. Although combining GQDs and RLs seems promising for the development of advanced biosensing and bioimaging systems, the RLs fabricated based on GQDs have been rarely studied. Here, we report on the fabrication of dye doped GQDs RLs with resonant feedback that are pumped optically with nanosecond pulses. GQDs, synthesized by the pyrolysis of citric acid, are used as scattering centers in an ethylene glycol solution of rhodamine B dye. It is demonstrated experimentally that discrete lasing modes with subnanometer linewidths appear at pump fluences above the threshold. Furthermore, the dependence of random lasing emission characteristics on the concentration of GQDs and the pump position is investigated experimentally.

中文翻译：

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来自石墨烯量子点掺杂染料溶液的共振随机激光发射

石墨烯量子点 (GQD) 比其他种类的半导体量子点更有前景，因为它们在生物成像、生物传感和发光二极管 (LED) 等不同应用中具有光稳定性和生物相容性。此外，随机激光器 (RL) 的进步促使人们越来越渴望开发更便宜、更精确和更简单的遥感和检测策略、闪电和成像系统。尽管结合 GQD 和 RL 似乎有希望开发先进的生物传感和生物成像系统，但很少研究基于 GQD 制造的 RL。在这里，我们报告了具有共振反馈的染料掺杂 GQD RL 的制造，这些共振反馈用纳秒脉冲进行光学泵浦。GQDs，由柠檬酸热解合成，在罗丹明 B 染料的乙二醇溶液中用作散射中心。实验证明，具有亚纳米线宽的离散激光模式出现在阈值以上的泵能量密度处。此外，通过实验研究了随机激光发射特性对 GQD 浓度和泵位置的依赖性。