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Instruments / Technical Area	Publication Details	Published	Actions
E01-JEM ARM 200CF	Manipulating the optical properties of carbon dots via fine tuning their structural features Hui Luo , Nikolaos Papaioannou , Enrico Salvadori , Maxie Roessler , Gereon Ploenes , Ernst R. H. Van Eck , Liviu Tanase , Jingyu Feng , Yiwei Sun , Yan Yang , Mohsen Danaie , Ana Jorge Sobrido , Andrei Sapelkin , James Durrant , Stoichko D. Dimitrov , Maria-magdalena Titirici Chemsuschem DOI: 10.1002/cssc.201901795 Diamond Proposal Number(s): [17587] Show Abstract ▼ Abstract: As a new class of sustainable carbon material, the term “carbon dots” represents an “umbrella term” as there are many types of materials included. We employ a broad range of techniques to develop understanding on hydrothermally synthesized carbon dots and show how fine tuning the structural features using simple reduction/oxidation reactions can drastically affect their excited state properties. Structural and spectroscopic studies found that photoluminescence originates from direct excitation of localized fluorophores involving oxygen functional groups, while the excitation at graphene‐like features leads to ultrafast phonon‐assisted relaxation and largely quenches the fluorescent quantum yields. This is arguably the first to identify the dynamics of photoluminescence including Stokes’ shift formation, allowing us to fully resolve the relaxation pathways in these carbon dots. The comprehensive investigation sheds light on how understanding the excited state relaxation processes in different carbon structure is crucial for tuning the optical properties for any potential commercial applications.	Aug 2019

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E01-JEM ARM 200CF

Manipulating the optical properties of carbon dots via fine tuning their structural features