激光器
材料科学
激发态
光电子学
随机激光器
光子学
人口倒转
激光阈值
光学
原子物理学
波长
物理
作者
Yongqiang Zhang,Lu Wang,Yongsheng Hu,Laizhi Sui,Liwen Cheng,Siyu Lu
出处
期刊:Small
[Wiley]
日期:2023-02-26
卷期号:19 (24): e2207983-e2207983
被引量:32
标识
DOI:10.1002/smll.202207983
摘要
Abstract As a new type of solution‐processed nano‐laser material, carbon dots (CDs) have shown considerable potential in optical communication, laser displays, micro/nano processing, and biomedicine. Reducing the laser threshold of the gain material is of considerable significance for further development of CDs’ applications in the field of micro/nano lasers. A series of blue‐emissive CDs (B‐CDs) are synthesized by changing the molar ratios of the precursors (citric acid (CA): L‐Cysteine (L‐Cys)). B‐CDs have a structure of carbon nanoparticles with their surface being modified with 5‐oxo‐3,5‐dihydro‐2Hthiazolo [3,2‐a]pyridine‐7‐carboxylic acid (TPCA). The laser can only be generated when the molar ratio of the precursors is between 1:1 and 2:1. With an increase in this ratio, the laser threshold decreases from 341.6 to 165.5 mJ cm −2 . The decrease in the laser threshold is attributed to the increase in the radiation transition rate and centralized sp 3 ‐related excited state levels, which are favorable for light amplification and population inversion. These results will be instructional for the reasonably design of CDs‐based laser materials and prompt their potential use in practical photonics.
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