Thermally Activated Upconversion Near-Infrared Photoluminescence from Carbon Dots Synthesized via Microwave Assisted Exfoliation

doi:10.1002/smll.201905050

CORC > 长春光学精密机械与物理研究所 > 中国科学院长春光学精密机械与物理研究所

	Thermally Activated Upconversion Near-Infrared Photoluminescence from Carbon Dots Synthesized via Microwave Assisted Exfoliation
	D.Li; C.Liang; E.V.Ushakova; M.H.Sun; X.D.Huang; X.Y.Zhang
刊名	Small
	2019
卷号	15 期号:50 页码:7
关键词	carbon dots,exfoliation,near-infrared absorption,near-infrared,photoluminescence,upconversion photoluminescence,graphene quantum dots,fluorescence
ISSN号	1613-6810
DOI	10.1002/smll.201905050
英文摘要	Upconversion near-infrared (NIR) fluorescent carbon dots (CDs) are important for imaging applications. Herein, thermally activated upconversion photoluminescence (UCPL) in the NIR region, with an emission peak at 784 nm, which appears under 808 nm continuous-wave laser excitation, are realized in the NIR absorbing/emissive CDs (NIR-CDs). The NIR-CDs are synthesized by microwave-assisted exfoliation of red emissive CDs in dimethylformamide, and feature single or few-layered graphene-like cores. This structure provides an enhanced contact area of the graphene-like plates in the core with the electron-acceptor carbonyl groups in dimethylformamide, which contributes to the main NIR absorption band peaked at 724 nm and a tail band in 800-850 nm. Temperature-dependent photoluminescence spectra and transient absorption spectra confirm that the UCPL of NIR-CDs is due to the thermally activated electron transitions in the excited state, rather than the multiphoton absorption process. Temperature dependent upconversion NIR luminescence imaging is demonstrated for NIR-CDs embedded in a polyvinyl pyrrolidone film, and the NIR upconversion luminescence imaging in vivo using NIR-CDs in a mouse model is accomplished.
URL标识	查看原文
语种	英语
内容类型	期刊论文
源URL	[http://ir.ciomp.ac.cn/handle/181722/63275]
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	D.Li,C.Liang,E.V.Ushakova,et al. Thermally Activated Upconversion Near-Infrared Photoluminescence from Carbon Dots Synthesized via Microwave Assisted Exfoliation[J]. Small,2019,15(50):7.
APA	D.Li,C.Liang,E.V.Ushakova,M.H.Sun,X.D.Huang,&X.Y.Zhang.(2019).Thermally Activated Upconversion Near-Infrared Photoluminescence from Carbon Dots Synthesized via Microwave Assisted Exfoliation.Small,15(50),7.
MLA	D.Li,et al."Thermally Activated Upconversion Near-Infrared Photoluminescence from Carbon Dots Synthesized via Microwave Assisted Exfoliation".Small 15.50(2019):7.