Tunable Near-Infrared Organic Nanowire Nanolasers
Xuedong Wang,* Zhi-Zhou Li, Ming-Peng Zhuo, Yishi Wu, Shuo Chen,* Jiannian Yao, and Hongbing Fu*
1Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices Institute of Functional Nano and Soft Materials (FUNSOM) Soochow University Suzhou, Jiangsu 215123, P.R. China
2Beijing National Laboratory for Molecular Sciences (BNLMS)Institute of Chemistry Chinese Academy of Sciences Beijing 100190, P.R. China
Organic semiconductor nanowires have inherent advantages, such as amenability to low-cost, low-temperature processing, and inherent four-level energy systems, which will significantly contribute to the organic solid-state lasers (OSSLs) and miniaturized laser devices. However, the realization of nearinfrared (NIR) organic nanowire lasers is always a big challenge due to the difficultly in fabrication of organic nanowires with diameters of ≈100 nm and material issues such as low photoluminescence quantum efficiency in the red-NIR region. What is more, the achievement of wavelength-tunable OSSLs has also encountered enormous challenge. This study first demonstrates the 720 nm NIR lasing with a low lasing threshold of ≈1.4 μJ cm−2 from the organic single-crystalline nanowires, which are self-assembled from small organic molecules of (E)-3-(4-(dimethylamino)-2-methoxyphenyl)-1-(1-hydroxynaphthalen-2-yl)prop-2-en-1-one through a facile solution-phase growth method. Notably, these individual nanowires’ Fabry–Pérot cavity can alternatively provide the red-NIR lasing action at 660 or 720 nm from the 0–1 or 0–2 radiative transition channels, and the single (660 or 720 nm)/dual-wavelength (660 and 720 nm) laser action can be achieved by modulating the length of these organic nanowires due to the intrinsic self-absorption. These easilyfabricated organic nanowires are natural laser sources, which offer considerable promise for coherent light devices integrated on the optics microchip.