Cao Mingxuan, Wang Min, Wang Zhiwen, Zang Luhao, Liu Hao, Xiao Shuping, Yuen Matthew M F, Wang Ying, Zhang Yating, Yao Jianquan
Department of Intelligent Manufacturing, Wuyi University, Jiangmen 529020, China.
Key & Core Technology Innovation Institute of The Greater Bay Area, Guangzhou 510535, China.
Materials (Basel). 2022 Mar 17;15(6):2213. doi: 10.3390/ma15062213.
An improvement in random lasers based on a colloidal quantum dot (QD)/graphene-doped polymer was observed and attributed to multiple light-scattering and graphene surface plasmon resonance. The emission characteristics of quantum dots doped with graphene oxide and reduced graphene oxide were compared. The QD/reduced graphene oxide hybrid exhibited a lower laser emission threshold (~460 μJ/cm). The emission modes and thresholds were strongly dependent on both the graphene doping concentration and the external temperature. Decreased plasmon coupling was the primary reason for lower QD/graphene laser emission with increasing temperature. The optimum reduced graphene oxide concentration was 0.2 wt.%. This work provides a practical approach to optimizing the threshold and stability of random laser devices, with potential applications in displays, sensors, and anti-counterfeiting labels.
基于胶体量子点（QD）/石墨烯掺杂聚合物的随机激光器有了改进，这归因于多重光散射和石墨烯表面等离子体共振。比较了掺杂氧化石墨烯和还原氧化石墨烯的量子点的发射特性。量子点/还原氧化石墨烯复合材料表现出较低的激光发射阈值（约460 μJ/cm）。发射模式和阈值强烈依赖于石墨烯掺杂浓度和外部温度。等离子体耦合减弱是量子点/石墨烯激光器发射随温度升高而降低的主要原因。最佳还原氧化石墨烯浓度为0.2 wt.%。这项工作为优化随机激光器件的阈值和稳定性提供了一种实用方法，在显示器、传感器和防伪标签方面具有潜在应用。
