title: Lasing behavior of surface functionalized carbon quantum dot/RhB composites.
abstract: Random lasers have been extensively and intensively investigated due to their fundamental importance and promising applications. Here, we explored the lasing behavior of carbon quantum dot (CQD)/Rhodamine B (RhB) composites. CQDs exhibited a broad emission spectrum which overlapped with the absorption spectrum of the RhB dye. We investigated an approach wherein the -OH, -NH2and -PO4group functionalized CQD/RhB composites showed lasing behavior. The optical pumping of functionalized CQD/RhB composites exhibited lasing emission which is dynamically tunable as a function of the surface properties of CQDs at the laser wavelength of 532 nm by varying the pump energy. The PO4-CQD/RhB composites showed a typical lasing emission with a linewidth of 3.2 nm at 587 nm at 1.86 mJ pump energy. We also demonstrated that the pH value of CQD solution played a key role on the lasing behavior of CQD/composites.
authors.affiliation: Jiangsu Key Laboratory for Carbon-based Functional Materials and Devices, Institute of Functional Nano and Soft Materials (FUNSOM), Soochow University, Suzhou, China. ljiang@suda.edu.cn chilf@suda.edu.cn zhkang@suda.edu.cn.
authors.forename: Ashish
authors.initials: A
authors.lastname: Yadav
authors.forename: Liang
authors.initials: L
authors.lastname: Bai
authors.forename: Yanmei
authors.initials: Y
authors.lastname: Yang
authors.forename: Juan
authors.initials: J
authors.lastname: Liu
authors.forename: Ajeet
authors.initials: A
authors.lastname: Kaushik
authors.forename: Gary J
authors.initials: GJ
authors.lastname: Cheng
authors.forename: Lin
authors.initials: L
authors.lastname: Jiang
authors.forename: Lifeng
authors.initials: L
authors.lastname: Chi
authors.forename: Zhenhui
authors.initials: Z
authors.lastname: Kang